Fluke MOLBOX1 PLUS S - V 6.00 User manual

© 1995 - 2010 Fluke Corporation, DH Instruments Division
molbox1+™/molbox1+S
molbloc®Terminal
(Ver. 6.00 and Higher)
Operation and Maintenance Manual

© 1995 - 2010 Fluke Corporation, DH Instruments Division Page 2
Warning
High pressure liquids and gases are potentially hazardous. Energy stored in these
liquids and gases can be released unexpectedly and with extreme force. High
pressure systems should be assembled and operated only by personnel who have
been instructed in proper safety practices.
©2010 Fluke Corporation, DH Instruments Division All rights reserved.
Information in this document is subject to change without notice. No part of this document may be reproduced or transmitted in any
form or by any means, electronic or mechanical, for any purpose, without the express written permission of Fluke Corporation, DH
Instruments Division 4765 East Beautiful Lane Phoenix AZ 85044-5318 USA.
DH Instruments makes sincere efforts to ensure accuracy and quality of its’ published materials; however, no warranty, expressed
or implied, is provided. DH Instruments disclaims any responsibility or liability for any direct or indirect damages resulting from the
use of the information in this manual or products described in it. Mention of any product does not constitute an endorsement by DH
Instruments of that product. This manual was originally composed in English and was subsequently translated into other
languages. The fidelity of the translation cannot be guaranteed. In case of conflict between the English version and other language
versions, the English version predominates.
DH Instruments, DH, DHI, molbox1, molbox1+, molbloc, molbloc-L, molbloc-S, molstic, COMPASS, CalTool are trademarks,
registered and otherwise, of Fluke Corporation, DH Instruments Division.
VCR is a registered trademark of the Swagelok Company.
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Document No. 3540962
100226
Printed in the USA.

Page I © 1995 - 2010 Fluke Corporation, DH Instruments Division
Table of Contents
Table of Contents ................................................................... I
Tables .................................................................................. V
Figures................................................................................ VI
About This Manual............................................................... VII
1. Introduction .....................................................................1
1.1 Product Overview...................................................................................................................................1
1.1.1 molbloc Flow Elements ........................................................................................................................... 2
1.1.1.1 molbloc-L Flow Element......................................................................................................................... 2
1.1.1.2 molbloc-S Flow Element......................................................................................................................... 3
1.2 Specifications.........................................................................................................................................3
1.2.1 General Specifications............................................................................................................................. 3
1.2.2 Reference Pressure Transducer (RPT) Specifications .......................................................................... 4
1.2.3 Temperature Measurement Specifications............................................................................................. 4
1.2.4 MFC Control Function (Optional) Specifications ................................................................................... 5
1.2.5 Flow Measurement Specifications.......................................................................................................... 5
1.2.5.1 molbloc-L ............................................................................................................................................... 5
1.2.5.2 molbloc-S............................................................................................................................................... 9
1.2.6 Front and Rear Panels........................................................................................................................... 24
1.2.6.1 Front Panel .......................................................................................................................................... 24
1.2.6.2 Rear Panel........................................................................................................................................... 24
2. Installation.....................................................................25
2.1 Unpacking and Inspection...................................................................................................................25
2.1.1 Removing From Packaging ................................................................................................................... 25
2.1.2 Inspecting Contents............................................................................................................................... 25
2.2 Site Requirements................................................................................................................................25
2.3 Initial Setup...........................................................................................................................................26
2.3.1 Preparing for Operation......................................................................................................................... 26
2.3.2 Power Connection.................................................................................................................................. 26
2.3.3 molbox1+ to molbloc Connections....................................................................................................... 27
2.3.4 Gas Supply and Flowpath Connections ............................................................................................... 27
2.3.5 Vacuum Supply (molbloc-S only).......................................................................................................... 28
2.3.6 Communications Connections.............................................................................................................. 28
2.3.7 MFC Control Option Connection........................................................................................................... 29
2.4 Power UP and Verification...................................................................................................................29
2.4.1 Power UP................................................................................................................................................ 29
2.4.2 Check Proper Pressure Measurement Operation................................................................................. 29
2.4.3 Check Proper Temperature Measurement Operation .......................................................................... 29
2.4.4 Check the MFC Control Function (Optional) ........................................................................................ 30
2.4.5 Leak Check............................................................................................................................................. 30
2.4.6 Check/Set Security Level....................................................................................................................... 30
2.5 Additional Precautions to Take Before Making Flow Measurements..............................................30
2.6 Short Term Storage..............................................................................................................................31
3. Operation .......................................................................33
3.1 General Operating Principles..............................................................................................................33
3.1.1 molbloc Channel A & Channel B........................................................................................................... 33
3.1.2 molbloc-L and molbloc-S Operation..................................................................................................... 33
3.1.3 Flow Ready/Not Ready Indication......................................................................................................... 34
3.1.3.1 molbloc-L Operation............................................................................................................................. 34
3.1.3.2 molbloc-S Operation............................................................................................................................. 34

MOLBOX1+™/MOLBOX1+S, MOLBLOC TERMINAL OPERATION AND MAINTENANCE MANUAL
© 1995 - 2010 Fluke Corporation, DH Instruments Division Page II
3.1.4 Reference Pressure Transducer (RPT) Overpressure ......................................................................... 35
3.1.5 molbloc-S BPR Limits............................................................................................................................ 35
3.2 Main Run Screen..................................................................................................................................36
3.2.1 molbloc-L Operation.............................................................................................................................. 37
3.2.2 molbloc-S Operation.............................................................................................................................. 38
3.3 Manual Operation.................................................................................................................................39
3.3.1 Keypad Layout and Protocol................................................................................................................. 39
3.3.2 Direct Function Keys Summary ............................................................................................................ 40
3.4 Direct Function Keys............................................................................................................................41
3.4.1 [K]............................................................................................................................................................ 41
3.4.2 [GAS]....................................................................................................................................................... 42
3.4.2.1 molbloc-L Operation............................................................................................................................. 43
3.4.2.2 molbloc-S Operation............................................................................................................................. 44
3.4.3 [UNIT]...................................................................................................................................................... 46
3.4.3.1 Mass Flow vs. Volume Flow................................................................................................................. 47
3.4.3.2 Volumetrically Based Mass Flow Units................................................................................................. 48
3.4.3.3 Volumetrically Based Mass Flow Units at Various Reference Temperatures (UXXX) ........................... 49
3.4.3.4 Volume Flow Units (vlm)....................................................................................................................... 49
3.4.3.5 Customizing FLOW Units Available Under The UNIT Function............................................................. 50
3.4.4 [TARE]..................................................................................................................................................... 51
3.4.4.1 <1Tare> ............................................................................................................................................... 52
3.4.4.2 <2Purge>............................................................................................................................................. 56
3.4.4.3 <3Leak Check>.................................................................................................................................... 57
3.4.4.4 <4AutoZ>............................................................................................................................................. 64
3.4.4.5 <5BPR> (molbloc-S Operation Only).................................................................................................... 69
3.4.5 [P&T] (Pressure and Temperature) ....................................................................................................... 70
3.4.5.1 molbloc-L Operation............................................................................................................................. 71
3.4.5.2 MOLBLOC-S operation........................................................................................................................ 71
3.4.6 [DISPLAY]............................................................................................................................................... 72
3.4.6.1 <1Rate>............................................................................................................................................... 73
3.4.6.2 <2Avg> (Average)................................................................................................................................ 74
3.4.6.3 <3 Hi/Lo> ............................................................................................................................................. 74
3.4.6.4 <4Total> (Totalizer).............................................................................................................................. 75
3.4.6.5 <5Unit>................................................................................................................................................ 77
3.4.6.6 <6Deviation>........................................................................................................................................ 78
3.4.6.7 <7Freeze>............................................................................................................................................ 80
3.4.6.8 <8Clean> ............................................................................................................................................. 80
3.4.7 [A/B] ........................................................................................................................................................ 81
3.4.8 [MFC](Optional)...................................................................................................................................... 81
3.4.8.1 MFC Run Screens................................................................................................................................ 82
3.4.8.2 MFC Profiles........................................................................................................................................ 83
3.4.8.3 Units of Measure When Using the MFC Control Option........................................................................ 83
3.4.9 [RES]....................................................................................................................................................... 84
3.5 [SETUP].................................................................................................................................................84
3.5.1 <1molbloc>............................................................................................................................................. 85
3.5.1.1 molbloc-L and molbloc-S Size and Range Designations....................................................................... 86
3.5.2 <2stab> ................................................................................................................................................... 87
3.5.3 <3ADJ> ................................................................................................................................................... 87
3.5.4 <4A_B> ................................................................................................................................................... 88
3.5.4.1 General Operation (Aspects Common to Both A_B Modes) ................................................................. 89
3.5.4.2 A+B mode............................................................................................................................................ 90
3.5.4.3 A/B Mode............................................................................................................................................. 90
3.5.5 <5MFC>................................................................................................................................................... 91
3.5.6 <6REG>................................................................................................................................................... 92
3.5.7 <7FLOWU>.............................................................................................................................................. 93
3.5.8 <8PRESU> .............................................................................................................................................. 93
3.5.9 <9TEMPU>.............................................................................................................................................. 94
3.6 [SPECIAL] .............................................................................................................................................95
3.6.1 <1reset>.................................................................................................................................................. 95
3.6.1.1 <1sets>................................................................................................................................................ 96
3.6.1.2 <2units>............................................................................................................................................... 96
3.6.1.3 <3MFC>............................................................................................................................................... 97
3.6.1.4 <4cal>.................................................................................................................................................. 97
3.6.1.5 <5all>................................................................................................................................................... 97
3.6.2 <2level>................................................................................................................................................... 98
3.6.2.1 Security Levels..................................................................................................................................... 98
3.6.3 <3UL>.....................................................................................................................................................101
3.6.3.1 Upper Limit Alarm and Sequence........................................................................................................102
3.6.4 <4cal>.....................................................................................................................................................102
3.6.5 <5Prefs>.................................................................................................................................................102
3.6.5.1 <1ScrSVR>.........................................................................................................................................103
3.6.5.2 <3ID>..................................................................................................................................................103

TABLE OF CONTENTS
Page III © 1995 - 2010 Fluke Corporation, DH Instruments Division
3.6.5.3 <3Time>..............................................................................................................................................104
3.6.6 <6REMOTE> ..........................................................................................................................................104
3.6.6.1 COM1 and COM2 ...............................................................................................................................105
3.6.6.2 IEEE-488.............................................................................................................................................105
3.6.6.3 RS232 Self-Test..................................................................................................................................105
3.6.7 <7Drivers> .............................................................................................................................................106
3.6.8 <8Head>.................................................................................................................................................106
3.6.9 <9BPR>..................................................................................................................................................107
4. Remote Operation ......................................................... 111
4.1 Overview .............................................................................................................................................111
4.2 Interfacing...........................................................................................................................................111
4.2.1 RS232 Interface.....................................................................................................................................111
4.2.1.1 COM1 .................................................................................................................................................112
4.2.1.2 COM2 .................................................................................................................................................112
4.2.2 IEEE-488 (GPIB).....................................................................................................................................113
4.3 Commands..........................................................................................................................................113
4.3.1 Command Syntax..................................................................................................................................113
4.3.2 Command Summary .............................................................................................................................113
4.3.3 Error Messages.....................................................................................................................................115
4.3.4 Command Descriptions........................................................................................................................116
4.3.4.1 IEEE Std. 488.2 Common and Status Commands...............................................................................116
4.3.4.2 molbox1+ commands..........................................................................................................................118
4.4 Status System.....................................................................................................................................138
4.4.1 Status Reporting System......................................................................................................................138
4.4.1.1 Status Byte Register............................................................................................................................138
4.4.1.2 Standard Event Register.....................................................................................................................140
5. Maintenance, Adjustments and Calibration...................... 141
5.1 Product Overview...............................................................................................................................141
5.2 Calibration Of Reference Pressure Transducers (RPTS)....................................................................142
5.2.1 Principle.................................................................................................................................................142
5.2.1.1 PA and PM Coefficients ......................................................................................................................142
5.2.2 Equipment Required .............................................................................................................................143
5.2.3 Set-Up and Preparation ........................................................................................................................143
5.2.4 Viewing and Editing RPT Readings and Calibration Information.......................................................144
5.2.4.1 Viewing RPT outputs...........................................................................................................................144
5.2.4.2 Viewing and Editing RPT PA, PM and Calibration Date ...........................................................................145
5.2.5 RPT Calibration/Adjustment Procedure Without Using CalTool for RPTs Software.........................146
5.3 MFC Control Function Adjustment...................................................................................................148
5.4 OHMIC Measurement [Temperature] System Verification..............................................................149
5.4.1 OHMIC Measurement System Calibration/Adjustment Procedure.....................................................151
5.5 molbloc Flow Adjustment..................................................................................................................152
5.5.1 molbloc Adjustment Procedure Without Using CalTool for molbloc Software .................................153
5.6 Reloading Embedded Software Into molbox1+ Flash Memory ......................................................154
5.7 Reloading molbloc EEPROM File......................................................................................................154
5.8 OVERHAUL .........................................................................................................................................154
6. Troubleshooting............................................................ 157
6.1 Overview .............................................................................................................................................157

MOLBOX1+™/MOLBOX1+S, MOLBLOC TERMINAL OPERATION AND MAINTENANCE MANUAL
© 1995 - 2010 Fluke Corporation, DH Instruments Division Page IV
7. Appendix...................................................................... 163
7.1 Conversion of Numerical Values ......................................................................................................163
7.1.1 Pressure ................................................................................................................................................163
7.1.2 Temperature..........................................................................................................................................163
7.1.3 Flow .......................................................................................................................................................164
7.2 Valve Drivers.......................................................................................................................................166
7.3 MFC Control Function........................................................................................................................168
7.3.1 MFC Connector .....................................................................................................................................168
7.3.1.1 Detailed Signal Descriptions................................................................................................................168
7.3.1.2 Popular Configurations........................................................................................................................169
7.4 Warranty Statement ...........................................................................................................................171
8. Glossary ...................................................................... 173

Page V © 1995 - 2010 Fluke Corporation, DH Instruments Division
Tables
Table 1. molbloc-L Pressure Dependent Calibration Types........................................................................7
Table 2. molbloc-L Ranges with Low Pressure and Downstream Calibrations...........................................7
Table 3: molbloc-L Ranges with High Pressure Calibrations......................................................................8
Table 4: molbloc-S Calibration Types.........................................................................................................11
Table 5: N2. molbloc-S Flow in Nitrogen at Various molbloc Upstream Pressures...................................13
Table 6: Ar. molbloc-S Flow in Argon at Various molbloc Upstream Pressures........................................13
Table 7: He. molbloc-S Flow in Helium at Various molbloc Upstream Pressures.....................................14
Table 8: SF6. molbloc-S Flow in Sulfur Hexafluoride at Various molbloc Upstream Pressures ...............14
Table 9: Xe. molbloc-S Flow in Xenon at Various molbloc Upstream Pressures......................................15
Table 10: C4H10. molbloc-S Flow in Butane at Various molbloc Upstream Pressures............................15
Table 11: C2H6. molbloc-S Flow in Ethane at Various molbloc Upstream Pressures..............................16
Table 12: C2H4. molbloc-S Flow in Ethylene at Various molbloc Upstream Pressures ...........................16
Table 13: H2. molbloc-S Flow in Hydrogen at Various molbloc Upstream Pressures ..............................17
Table 14: CH4. molbloc-S Flow in Methane at Various molbloc Upstream Pressures..............................17
Table 15: C3H8. molbloc-S Flow in Propane at Various molbloc Upstream Pressures............................18
Table 16: CF4. molbloc-S Flow in Carbon Tetrafluoride at Various molbloc Upstream Pressures...........18
Table 17: C2F6. molbloc-S Flow in Hexafluoroethene at Various molbloc Upstream Pressures .............19
Table 18: CHF3. molbloc-S Flow in Trifluoromethane at Various molbloc Upstream Pressures..............19
Table 19: Air. molbloc-S Flow in Air at Various molbloc Upstream Pressures..........................................20
Table 20: CO2. molbloc-S Flow in Carbon Dioxide at Various molbloc Upstream Pressures ..................20
Table 21: CO. molbloc-S Flow in Carbon Monoxide at Various molbloc Upstream Pressures.................21
Table 22: N2O. molbloc-S Flow in Nitrous Oxide at Various molbloc Upstream Pressures .....................21
Table 23: C4F8. molbloc-S Flow in Octafluorocyclobutane1 at Various molbloc Upstream Pressures....22
Table 24: O2. molbloc-S Flow in Oxygen at Various molbloc Upstream Pressures..................................22
Table 25: molbox1+ Parts List ....................................................................................................................25
Table 26: Minimum molbloc-S Critical Flow (slm) in Nitrogen at Various molbloc-S
Downstream Pressures ...........................................................................................................36
Table 27: Summary of molbox1+ Direct Function Key Operations............................................................40
Table 28. Available molbloc-L Gases ........................................................................................................43
Table 29. Available Flow Units...................................................................................................................50
Table 30. Flow Units and Corresponding Total Mass or Volume Units.....................................................77
Table 31. molbloc-L Size and Nominal Range Designations.....................................................................86
Table 32. molbloc-S Size and Pressure to Flow Conversion Ratio (KF) ....................................................86
Table 33. Pressure Units of Measure Available.........................................................................................94
Table 34. Security Levels - Functions NOT Executed Per Function/Level................................................99
Table 35. COM1 and COM2 Available Settings.......................................................................................105
Table 36. COM1 DB-9F Pin Designation.................................................................................................112
Table 37. COM2 DB-9M Pin Designation ................................................................................................112
Table 38. Command Summary................................................................................................................113
Table 39. Error Messages........................................................................................................................115
Table 40. Status Byte Register ................................................................................................................138
Table 41. Standard Event Register..........................................................................................................140
Table 42. Troubleshooting Checklist........................................................................................................157
Table 43. Pressure Unit Conversions ......................................................................................................163
Table 44. Temperature Unit Conversion..................................................................................................163
Table 45. Conversions from kg/s to sccm at 0 °C for Various Gases......................................................164

MOLBOX1+™/MOLBOX1+S, MOLBLOC TERMINAL OPERATION AND MAINTENANCE MANUAL
© 1995 - 2010 Fluke Corporation, DH Instruments Division Page VI
Table 46. Conversions from sccm at 0 °C to Other Volumetrically Based Flow Units.............................164
Table 47. Conversions from Volumetrically Based Flow Units at 0 °C to
Corresponding Units at Another Temperature (uxxx)............................................................165
Table 48. Conversions from kg/s to mole/s for Various Gases................................................................165
Table 49. Conversion from mole/s to pccm .............................................................................................165
Table 50. Conversion from sccm at 0 °C to Volume Flow Units at
Another Pressure and Temperature......................................................................................166
Table 51. Driver/Max Current Per Output ................................................................................................166
Table 52. External Drivers........................................................................................................................167
Table 53. Interface Cable Building Instructions .......................................................................................168
Table 54. Common MFC Connector Pin Out...........................................................................................170
Table 55. Brooks MFC Connector Pin Out ..............................................................................................170
Table 56. DHI Authorized Service Providers ...........................................................................................171
Figures
Figure 1. molbox1+ Front Panel.................................................................................................................24
Figure 2. Rear Panel..................................................................................................................................24
Figure 3. molbox1+ Internal Pneumatic Schematic - CHANNEL A ACTIVE, molbloc-L OPERATION.....33
Figure 4. Keypad Layout............................................................................................................................39
Figure 5. molbox1+ Internal Pneumatic Schematic –................................................................................52
Figure 6. molbox1+ Internal Pneumatic Schematic –
TARING CHANNEL A, molbloc-S OPERATION.....................................................................55
Figure 7. molbox1+ Internal Pneumatic Schematic – PURGING CHANNEL A ........................................56
Figure 8. molbox1+ Internal Pneumatic Schematic - LEAK CHECK molbox CHANNEL A.......................59
Figure 9. molbox1+ Internal Pneumatic Schematic - SYSTEM LEAK CHECK -
CHECKING OFFSET AND STABILITY...................................................................................60
Figure 10. molbox1+ Internal Pneumatic Schematic - SYSTEM LEAK CHECK ON CHANNEL A -
CHECKING OFFSET AND STABILITY...................................................................................63
Figure 11. molbox1+ Internal Pneumatic Schematic – molbloc-S OPERATION,
CHANNEL A, BPR ON ..........................................................................................................108
Figure 12. molbox1+ Internal Pneumatic Schematic –molbloc-S OPERATION,
CHANNEL A, BPR OFF ........................................................................................................108
Figure 13. Status Byte Register...............................................................................................................139
Figure 14. molbox1+ Internal Pneumatic Schematic -.............................................................................145
Figure 15. Cable Driver Ports ..................................................................................................................167

Page VII © 1995 - 2010 Fluke Corporation, DH Instruments Division
About This Manual
This manual provides the user with the information necessary to operate a molbox1+ and a molbox1+S
molbloc terminal with molbloc mass flow elements to make mass flow measurements. Unless stated
otherwise, references to molbox1+ also include molbox1+S. It also includes a great deal of additional
information provided to help you optimize use of a molbloc/molbox1+ system and take full advantage of
its many features and functions.
Before using the manual, take a moment to familiarize yourself with the Table of Contents structure.
All first time molbox1+ users should read Section 1. Section 3.1 provides a comprehensive description of
general molbox1+ operating principles. Section 4. is for remote operation from an external computer.
Section 5 provides maintenance and calibration information. Section 6 is a quick troubleshooting guide.
Use this section to troubleshoot unexpected molbox1+ behavior based on the symptoms of that behavior.
Cross references are used extensively to direct you towards additional information on a topic.
Cross references are generally in parentheses and give the reference’s section number. For example:
(see Section 11).
Certain words and expressions have specific meaning as they pertain to molbox1+. The Glossary
Section is useful as a quick reference for exact definition of specific words and expressions as they are
used in this manual.
Note
For those of you who “don’t read manuals”, go directly to section 2.3, initial setup,
to set up your molbox1+. Then go to section 2.4, power up and verification. This
will get you running quickly with minimal risk of causing damage to yourself or
your molbox1+. Then… when you have questions or start to wonder about all the
great features you might be missing, get into the manual!
Manual Conventions
Caution
“Caution” is used in throughout the manual to identify conditions or actions that
could cause harm to the molbox1+ or to the devices that are connected to the
molbox1+.
Warning
“Warning” is used in throughout the manual to identify actions that could pose a
hazard to the user of the molbox1+.
Note
“Note” is used throughout the manual to identify operating and applications advice
and additional explanations.
[ ] Indicates direct function keys (e.g., [RANGE]).
< > Indicates molbox1+ screen displays (e.g., <1yes>).

MOLBOX1+™/MOLBOX1+S, MOLBLOC TERMINAL OPERATION AND MAINTENANCE MANUAL
© 1995 - 2010 Fluke Corporation, DH Instruments Division Page VIII
Notes

Page 1 © 1995 - 2010 Fluke Corporation, DH Instruments Division
1. Introduction
1.1 Product Overview
molbox1+ and molbox1+S are support units for making gas flow measurements using molbloc mass flow
elements. Although the molbox1+ and the molbox1+S are separate products their functions and
operation are virtually identical. The key difference is that molbox1+S is designed for higher flows and it
only supports molbloc-S mass flow elements. A molbox1+ supports both molbloc-L and molbloc-S. Each
product reads calibration data from a molbloc EEPROM and measures molbloc upstream and
downstream pressure using built-in high precision Reference Pressure Transducers (RPTs). There are
several RPT range specific models in the molbox1+ product line: molbox1+ A350K, molbox1+ A700K,
molbox1+S A1.4M and molbox1+S A2M.
An ohmic measurement system reads the resistance of the molbloc platinum resistance thermometers
from which the molbloc temperature is calculated. Using the molbloc calibration data, measured
pressures and temperature and gas properties stored in memory, the flow rate of the gas flowing through
the molbloc is calculated.
Internal molbox1+ valves support on-board PRESSURE TRANSDUCER TARING, molbloc-S BPR MODES,
LEAK TESTING and SELF PROTECTION functions as well as a GAS PURGE routine. The molbox1+S
does not support PRESSURE TRANSDUCER TARING as it does not support molbloc-L operation and does
not include a bypass valve to connect the upstream and downstream RPTs.
molbox1+ provides a local user interface via a front panel key pad and display and includes advanced
on-board functions. Remote communication capability is supported with RS232 and IEEE-488 interfaces.
molbox1+ is equipped to handle molblocs on two separate channels. This allows easy switching between
two different molblocs as well as certain special dual channel functions. Internal valving switches the
molbox1+ pressure transducers from one molbloc to the other as needed.
molbox1+ is intended for applications in which minimizing measurement uncertainty is the most important
requirement and/or integrated control of mass flow controllers (MFCs) is needed. A second model,
molbox RFM, is available for applications where a compact presentation and lower cost are the most
dominant requirements.
molbox1+ replaces the Fluke/DHI molbox1 product line. molbox1+ introduces several product
improvements over molbox1 including:
•Support for Q-RPT pressure sensor technology to improve linearity and precision on pressure
measurements.
•Improved gas property uncertainty using data from NIST Reference Fluid Thermodynamic and
Transport Properties Database (REFPROP).
•Support of expanded molbloc modelization and polynomial linearization data structure and
calculations. This new molbloc data structure allows greatly improved flow measurement
performance across the supported operating pressure and flow/Reynolds number ranges. This new
model makes the Premium calibration option and resulting specifications possible.
•Support for “named” molbloc calibrations – allowing storage of multiple pressure-dependent
calibrations in each gas on a molbloc. Also provides for stated operating limits of pressure, flow and
Reynolds number to be stored on the molbloc so the molbox1+ can alert the user of operating
conditions that are outside of the calibrated parameters, avoiding out of tolerance measurements.
•Simplified internal pneumatic design.

MOLBOX1+™/MOLBOX1+S, MOLBLOC TERMINAL OPERATION AND MAINTENANCE MANUAL
© 1995 - 2010 Fluke Corporation, DH Instruments Division Page 2
For easy identification, new molbox1+ terminals are produced with serial numbers of 2000 and higher.
Older molbox1 terminals may be eligible for upgrade to molbox1+ hardware, software and specifications
by Fluke/DHI.
1.1.1 molbloc Flow Elements
Two different types of molblocs may be used with molbox1+; molbloc-L (laminar) and
molbloc-S (sonic). molbox1+ supports operation with new or upgraded molblocs that have
the updated data structure to take advantage of molbox1+ version 6.00 or later features, and
also supports operation with older molblocs that do not have a version 6.00 data format.
Premium calibrations and associated specifications are only an option for molblocs that have
the version 6.00 format.
1.1.1.1 molbloc-L Flow Element
molbloc-L is the original molbloc laminar flow element. molbloc-L covers the
lower portion of the molbloc/molbox1+ system flow range. The key molbloc-L
measurement is the differential pressure across the element, which is roughly
proportional to the mass flow rate through it. molbloc-L elements are calibrated
to be used at an absolute pressure which remains nearly constant, while the
differential pressure varies with flow rate. Different operating pressure options
and their effect on molbloc flow range are described in Section 1.2.5.1.1.
In addition to the new data structure and modelization methods that became
available for molblocs with the introduction of molbox1+, all molbloc-L elements
of range 1E1-L to 3E4-L produced or upgraded after the release of molbox1+ are
equipped standard with an upstream ¼” VCR flange, or flowpath connection, that
has an integrated sintered metal filter. This filter is intended to be a last defense
against particulate contamination of the molbloc-L internal flowpath which can
affect molbloc-L measurements. Every effort should still be made to supply clean
dry gas to the molbloc to ensure its measurement performance and long-term
stability. molblocs that have the integrated upstream filter are recognizable by
the visible filter element as shown below.
Figure 1: molbloc-L Upstream End Flange with Integrated Filter
New molbloc-L elements produced with molbox1+ calibration data structure,
premium calibration options, and integrated filter hardware can be identified by
having a serial number of 6000 or higher. Most older molbloc-L elements are
eligible for upgrade to this hardware/version 6.00 format by Fluke/DHI.

1. INTRODUCTION
Page 3 © 1995 - 2010 Fluke Corporation, DH Instruments Division
1.1.1.2 molbloc-S Flow Element
molbloc-S elements use critical (sonic) flow venturi nozzle technology to measure
flows which overlap with the ranges of molbloc-L and cover the higher end of the
molbloc/molbox1+ system flow range. The mass flow rate through a molbloc-S
element is roughly proportional to the upstream absolute pressure when the flow
is “choked”, so the molbloc-S operating pressure can vary widely as the mass
flow rate is changed throughout the flow range. The limits of molbloc-S operating
pressure and flow ranges are defined by the molbloc-S calibration type,
described in Section 1.2.5.2.2.
New calibration data structure and premium calibration options for molbloc-S
were also introduced along with molbox1+. molbloc-S elements produced with
this support will have serial number of 4000 or higher. Older molbloc-S elements
are eligible for upgrade to version 6.00 format by Fluke/DHI.
1.2 Specifications
1.2.1 General Specifications
Power Requirements 85 to 264 VAC, 50 to 60 Hz, 22 VA max. consumption
Fuse 1A/250V, slow blow, 5x20mm, NSN: 5920008930491
Operating Temperature Range 15 to 35 °C
Storage Temperature Range - 20 to 70 °C
Vibration Meets MIL-T-28800D
Weight 6.8 kg (15 lb) max.
Dimensions 32 cm W x 12 cm H x 30 cm D
(12.6 in. x 4.7 in. x 11.8 in.) approx.
Microprocessor Motorola 68302, 16 MHz
Communication Ports RS232 (COM1), RS232 (COM2), IEEE-488
Reference Pressure
Transducers(RPTs) molbox1+ A350K 2 x 300 kPa (44 psia) calibrated range
oscillating quartz crystal
molbox1+ A700K 2 x 600 kPa (87 psia) calibrated range
oscillating quartz crystal
molbox1+S A1.4M 1 x 1200 kPa (174 psia) calibrated range
oscillating quartz crystal, 1 x 300 psi silicon based
molbox1+S A2M 1 x 2000 kPa (290 psia) calibrated range
oscillating quartz crystal, 1 x 300 psi silicon based
Pressure Limits molbox1+ A350K
Maximum working pressure 300 kPa absolute (36 psia)
Maximum pressure without damage 350 kPa absolute (50 psia)
molbox1+ A700K
Maximum working pressure 600 kPa absolute (87 psia)
Maximum pressure without damage 700 kPa absolute (115 psia)
molbox1+S A1.4M
Maximum working pressure 1200kPa absolute (203 psia)
Maximum pressure without damage 1500 kPa absolute (218 psia)
molbox1+S A2M
Maximum working pressure 2000 kPa absolute (290 psia)
Maximum pressure without damage 2200 kPa absolute (320 psia)
Pressure Connections
Quick connectors equivalent to Swagelok
®
QM Series (M2-B200)
Ohmic Measurement System Resolution 0.004 Ω
Accuracy ± 0.04 Ω
Accuracy of 100 and 110
Ω
reference resistors ± 0.01 %
Stability of 100 and 110 Ωreference resistors
± 0.005 % per 3 yrs

MOLBOX1+™/MOLBOX1+S, MOLBLOC TERMINAL OPERATION AND MAINTENANCE MANUAL
© 1995 - 2010 Fluke Corporation, DH Instruments Division Page 4
Gases Supported molbloc-L and molbloc-S
Nitrogen (N2), dry Air, humid Air (molbloc-S only) , Argon (Ar), Butane
(Butn), Carbon Monoxide (CO), Helium (He), Oxygen (O2), Carbon
Dioxide (CO2), Carbon Tetrafluoride (CF4), Octofluorocyclobutane
(C4F8), Ethane (C2H6), Ethylene (C2H4), Fluoroform (CHF3),
Hexafluoroethane (C2F6), Hydrogen (H2), Methane (CH4), Nitrous
Oxide (N2O), Propane (C3H8), Sulfur Hexafluoride (SF6), Xenon (Xe)
Flow Ranges See Section 1.2.5.
Valve Driver Option (8) 12 V outputs.
Each output can sink,500 mA at 12 V, max. 1 A total (see Section 7.2).
CE Conformance Available. Must be specified.
1.2.2 Reference Pressure Transducer (RPT) Specifications
Type Oscillating quartz crystal with mechanical bellows
Calibrated Range A350K 20 to 300 kPa absolute (2.9 to 44 psia)
A700K 20 to 600 kPa absolute (2.9 to 87 psia)
A1.4M 100 to 1200 kPa absolute (14.5 to 174 psia)
A2M 100 to 2000 kPa absolute (14.5 to 290 psia)
Resolution A350K 0.4 Pa (0.00005 psi)
A700K 0.7 Pa (0.0001 psi)
A1.4M 1.4 Pa (0.0002 psi)
A2M 2 Pa (0.0003 psi)
Accuracy A350K
Absolute pressure1± (0.01 % of reading or 0.003 % Q-RPT span,
whichever is greater)
Differential ± (4.2 Pa (0.0006 psi) or 0.026 % ΔP,
whichever is greater)
A700K
Absolute pressure1± (0.01 % of reading or 0.003 % Q-RPT span,
whichever is greater)
Differential ± (8.4 Pa (0.0012 psi) or 0.032 % ΔP,
whichever is greater)
A1.4M
Absolute pressure1± (0.01 % of reading or 0.003 % Q-RPT span,
whichever is greater)
A2M
Absolute pressure1± (0.01 % of reading or 0.003 % Q-RPT span,
whichever is greater)
1With regular use of Autozero. Add 0.005 % of Q-RPT span for one
year without use of AutoZero,
1.2.3 Temperature Measurement Specifications
Specifications are for molbloc mounted Platinum Resistance Thermometers (PRT) combined
with molbox1+ resistance measurement system and temperature calculation.
Range 0 to 40 °C
Accuracy ± 0.05 °C
Resolution 0.01 °C
The molbox1+ internal resistance measurement system is automatically calibrated using
reference 100 and 110 Ω (± 0.01 %) resistors (see Section 5.4).

1. INTRODUCTION
Page 5 © 1995 - 2010 Fluke Corporation, DH Instruments Division
1.2.4 MFC Control Function (Optional) Specifications
Analog Output Voltage Range 0 to 6.000 VDC
Voltage Accuracy
± 0.1 % FS
Voltage Resolution
0.1 mVDC
Current Range
4.01 to 20 mA
Current Accuracy
± 0.1 % FS
Current Resolution
0.4 µA
Analog Input
Voltage Range
0 to 5.000 VDC
Min/Max Measurable Voltage
- 0.25/6.00 VDC
Voltage Accuracy
±0.1 % FS
Voltage Resolution
1 mVDC
Current Range
4 to 20 mA
Current Accuracy
±0.1 % FS
Current Resolution
0.4 µA
Valve Test Point
Range
+ 2 to + 15 VDC (in reference to - 15 VDC)
Accuracy
±0.25 % FS
Resolution
2.5 mVDC
1.2.5 Flow Measurement Specifications
molbox1+ measures the flow through molbloc flow elements. There are two different types of
molblocs, molbloc-L (laminar) (see Section 1.1.1.1) and molbloc-S (sonic) (see Section
1.1.1.2). Flow measurement specifications, calibration types, ranges and dimensions are
detailed separately for each molbloc type in section 1.2.5.1 and 1.2.5.2. For both molbloc-L
and molbloc-S elements, there are separate performance specifications given for the
premium and standard calibration types that are offered.All flow measurement uncertainties
are valid only for measurents in a gas for which the molbloc is calibrated, and within the
range of pressures for which the calibration is specified.
1.2.5.1 molbloc-L
The flow range, useable operating pressure and absolute and differential
pressure associated with molbloc-L operation depend on the molbloc used and
its pressure-dependent calibration options (see Section1.2.5.1.3).
1.2.5.1.1 Standard molbloc-L Calibrations
Measurement Update
Rate
1 second
Range
0 to molbloc full scale depending on gas and molbloc pressure
dependent calibration type (see Section 1.2.5.1.3)
Resolution
0.0015 % FS
Linearity
±0.05 % of reading from 10 to 100 % FS,
±0.005 % FS under 10 % FS
Repeatability
±0.05 % of reading from 10 to 100 % FS,
±0.005 % FS under 10 % FS
Precision1
±0.07 % of reading from 10 to 100 % FS,
±0.007 % FS under 10 % FS
Stability2
(1 year) ±0.09 % of reading from 10 to 100 % FS,
±0.009 % FS under 10 % FS

MOLBOX1+™/MOLBOX1+S, MOLBLOC TERMINAL OPERATION AND MAINTENANCE MANUAL
© 1995 - 2010 Fluke Corporation, DH Instruments Division Page 6
Measurement
Uncertainty3
(N2 and any molbox1+
supported gas for which
the molbloc in use is
calibrated)
±0.2 % of reading from 10 to 100 % FS,
±0.02 % FS under 10 % FS
1E5 molbloc
±0.5% of reading from 25 to 100 % FS,
±0.125 % FS under 25 % FS
1 Precision: Combined linearity, hysteresis, repeatability.
2 Stability: Maximum change in zero and span over specified time period for typical molbox1+ and molbloc used
under typical conditions. As stability can only be predicted, stability for a specific molbloc and molbox1+ should
be established from experience.
3 Measurement uncertainty (accuracy): Maximum deviation of the molbox1+ flow indication from the true value of
the flow through the molbloc including precision, stability and DHI calibration standard measurement
uncertainty.
1.2.5.1.2 Premium molbloc-L Calibrations
Measurement Update
Rate 1 second
Range 0 to molbloc full scale depending on gas and molbloc pressure
dependent calibration type (see Section 1.2.5.1.2)
Resolution 0.0015 % FS
Linearity ±0.05 % of reading from 10 to 100 % FS,
±0.005 % FS under 10 % FS
Repeatability ±0.05 % of reading from 10 to 100 % FS,
±0.005 % FS under 10 % FS
Precision1±0.07 % of reading from 10 to 100 % FS,
±0.007 % FS under 10 % FS
Stability2
(1 year) ±0.03 % of reading from 10 to 100 % FS,
±0.003 % FS under 10 % FS
Measurement
Uncertainty3
(N2 and any molbox1+
supported gas for which
the molbloc in use is
calibrated)
±0.125 % of reading from 10 to 100 % FS,
±0.0125 % FS under 10 % FS
1E5 molbloc-L Premium calibration not available
1 Precision: Combined linearity, hysteresis, repeatability.
2 Stability: Maximum change in zero and span over specified time period for typical molbox1+ and molbloc used
under typical conditions. As stability can only be predicted, stability for a specific molbloc and molbox1+ should
be established from experience.
3 Measurement uncertainty (accuracy): Maximum deviation of the molbox1+ flow indication from the true value of
the flow through the molbloc including precision, stability and DHI calibration standard measurement
uncertainty.
1.2.5.1.3 molbloc-L Pressure Dependent Calibration Types
Note
See your molbloc’s Calibration Report to determine the
calibration type of the molbloc you are using.
Different pressure dependent calibration options for molbloc-L elements determine
the range of operating pressures over which a molbloc can be used within its
mass flow measurement specifications. The calibration option also affects the
molbloc flow range and the differential pressure associated with the flow range.
Measurement uncertainty (accuracy) specifications for molbloc-L are valid only
for gases with which the molbloc has been calibrated. All molbloc-L elements
are calibrated for N2. Calibrations with other gases are optional. DHI calibration
capability is not maintained at all times for all gases on all molbloc designations.
Check for availability before ordering calibrations.
The molbloc-L pressure dependent calibration types are summarized in Table 1.

1. INTRODUCTION
Page 7 © 1995 - 2010 Fluke Corporation, DH Instruments Division
Table 1. molbloc-L Pressure Dependent Calibration Types
CALIBRATION TYPE
(CALIBRATION NAME)
OPERATING PRESSURE NOMINAL DIFFERENTIAL
PRESSURE AT MAX. FLOW
1E5
MOLBLOC
ALL OTHER
MOLBLOCS
Low pressure
(LOP) 200 to 325 kPa absolute
(29 to 48 psia)
upstream of molbloc
5 kPa
(.725 psi) 50 kPa (7.5 psi)
High pressure
(HIP) 325 to 525 kPa absolute
(48 to 76 psia)
upstream of molbloc
Not available 50 kPa
(7.5 psi)
Downstream
(DOWN) Atmospheric pressure
downstream of molbloc. 85 to
105 kPa (12 to15 psia).
12.5 kPa
(1.8 psi) 80 kPa (12 psi)
Note
Differential pressure values are nominal and may vary by up to
15 % with the actual molbloc used.
1.2.5.1.4 molbloc-L Ranges with Low Pressure and
Downstream Calibrations
Table 2. molbloc-L Ranges with Low Pressure and Downstream Calibrations
molbloc-L SIZE AND FULL SCALE FLOW (sccm @ 0 ºC)
GASES SIZE
1E1 SIZE 5E1 SIZE 1E2 SIZE 2E2 SIZE 5E2 SIZE 1E3 SIZE 5E3 SIZE 1E4 SIZE 3E4 SIZE 1E5
INERT
Nitrogen N210 50 100 200 500 1,000 5,000 10,000 30,000 100,000
Argon Ar 10 50 100 200 500 1,000 5,000 10,000 30,000 80,000
Helium He 10 50 100 200 500 1,000 5,000 10,000 30,000 100,000
Sulfur Hexafluoride SF610 50 100 200 500 1,000 2,000
500 6,000 1,000 6,000 4,000 ---
---
Xenon XE 10 40 80 150 400 800 3,500
500 8,000 11,000 3,000 30,000 20,000
FLAMMABLE
Butane C4H1
020 100 130
30 270 50 670 140 2,300 2,200 1,400 7,000 3,000 ---
--- --- ---
Ethane C2H620 100 200 400 1,000 2,000 6,000
1,000 18,000 2,000 18,000 6,000 60,000 50,000
Ethylene C2H416 80 160 320 800 1 600 7,000
1,000 16,000 20,000 5,000 70,000 40,000
Hydrogen H220 100 200 400 1,000 2,000 10,000 20,000 60,000 200,000
Methane CH416 80 160 320 800 1 600 8,000 16,000 40,000
5,000 120,000 40,000
Propane C3H820 100 200 400 1,000 2,000 3,000
1,000 10,000 2,000 10,000 7,000 ---
---
FLUORO-
CARBONS
Carbon
Tetrafluoride CF410 50 100 200 500 1,000 4,000
600 10,000 12,000 3,000 36,000 25,000
Hexafluorethene C2F610 50 100 200 500 1,000 2,000
600 6,000 1,200 6,000 4,000 ---
---
Trifluoromethane CHF310 50 100 200 500 1,000 4,000
600 10,000 12,000 4,000 38,000 30,000
OTHER
Air Air 10 50 100 200 500 1,000 5,000 10,000 30,000 100,000
Carbon Dioxide CO210 50 100 200 500 1,000 5,000 10,000 20,000
4,000 60,000 30,000
Carbon Monoxide CO 10 50 100 200 500 1,000 5,000 10,000 30,000 100,000
Nitrous Oxide N2O 10 50 100 200 500 1,000 5,000 10,000 20,000
4,000 60,000 30,000
Octafluorocyclobutane1C4F815 60
965 17 130 34 330 85 1,100 175 1,050 840 3,400 1,700 --- ---
Oxygen O210 50 100 200 500 1,000 5,000 10,000 30,000 80,000
See Table 3 for footnotes.

MOLBOX1+™/MOLBOX1+S, MOLBLOC TERMINAL OPERATION AND MAINTENANCE MANUAL
© 1995 - 2010 Fluke Corporation, DH Instruments Division Page 8
1.2.5.1.5 molbloc-L Ranges with High Pressure Calibrations
Table 3: molbloc-L Ranges with High Pressure Calibrations
molbloc-L SIZE AND FULL SCALE FLOW (sccm @ 0 ºC)
GASES SIZE
1E1 SIZE 5E1 SIZE 1E2 SIZE 2E2 SIZE 5E2 SIZE 1E3 SIZE 5E3 SIZE 1E4 SIZE 3E4 SIZE 1E5
INERT
Nitrogen N220 100 200 400 1,000 2,000 10,000 20,000 40,000
7,500 N/A
Argon Ar 20 100 200 400 1,000 2,000 10,000 17,000 35,000
6,000 N/A
Helium He 20 100 200 400 1,000 2,000 10,000 20,000 65,000 N/A
Sulfur Hexafluoride SF625 100
15 120 30 250 50 600 150 2,000 300 2,000 1,400 6,200 2,800 -- -- N/A
Xenon XE 20 100 150 350 650 1,700 3,350
950 11,000 1,900 11,000 5,700 N/A
FLAMMABLE
Butane C4H10 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
Ethane C2H640 200 350
50 700 100 1,800 200 4,000 6,000 2 300 20,000 4,500 20,000 13,000 N/A
Ethylene C2H440 200 350 700 2,000 4,000 7,000
2,000 22,000 4,000 22,000 12,700 N/A
Hydrogen H240 200 400 900 2,000 4,500 22,000 45,000 130,000 N/A
Methane CH435 175 350 700 1,700 3,500 13,000
2,000 33,000 42,000 12,000 N/A
Propane C3H850 200
25 200 50 400 100 1,000 250 3,500 500 3,500 2,600 11,000 5,400 -- -- N/A
FLUORO-
CARBONS
Carbon
Tetrafluoride CF420 100 200 400 1,000 2,000 3,700
1,200 12,000 2,400 12,000 7,300 N/A
Hexafluorethene C2F625 100
15 120 30 250 50 600 150 2,000 300 1,800 1,500 6,000 3,000 -- -- N/A
Trifluoromethane CHF325 125 240
30 450 60 1,200 150 2,500 4,000 1,500 12,000 3,000 12,000 8,800 N/A
OTHER
Air Air 20 100 200 400 1,000 2,000 10,000 20,000 40,000
7,200 N/A
Carbon Dioxide CO225 125 250 500 1,250 2,500 6,600
1,400 20,000 2,500 20,000 8,800 N/A
Carbon Monoxide CO 20 100 200 400 1,000 2,000 10,000 20,000 40,000
7,500 N/A
Nitrous Oxide N2O 25 125 250 500 1,250 2,500 11,000
1,500 20,000 3,000 20,000 9,000 N/A
Octafluorocyclobutane
2
C4F8N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
Oxygen O220 100 200 400 1,000 2,000 10,000 20,000 40,000
6,500 N/A
A bold value indicates that the maximum flow is limited by the maximum Reynolds number value of 1 200 which is reached
before the normal differential pressure range is reached. In that case, the second value gives the minimum flow for which
measurement uncertainty (accuracy) is equal to the nominal uncertainty specification. Divide the second value by 10 when
using molbox RFM microrange option.
Where there is no value in the field (–), this indicates that the maximum Reynolds number is reached before the differential
pressure reaches 5 kPa (1 kPa in the case of the 1E5 molbloc), therefore calibration with that gas is not useful.
1 Due to low vapor pressure, only downstream calibration type is available.
2 The operating pressure range is greater than the vapor pressure value for this gas.

1. INTRODUCTION
Page 9 © 1995 - 2010 Fluke Corporation, DH Instruments Division
1.2.5.1.6 molbloc-L Dimensions
molbloc-L SIZES [mm(in.)]
5E3 AND LOWER 5E3 AND LOWER
A 58.50 (2.303) A 58.50 (2.303)
B 16.00 (0.630) B 16.00 (0.630)
C 32.00 (1.260) SQ C 32.00 (1.260) SQ
D 68.84 (2.750) D 68.84 (2.750)
E 19.06 (0.750) E 19.06 (0.750)
F 124.00 (4.881) F 124.00 (4.881)
G 1/4 in. VCR M G 1/4 in. VCR M
1.2.5.2 molbloc-S
The flow range and operating pressure associated with molbloc-S operation
depend on the molbloc and molbox used and the the molbloc calibration option
selected (see Section 1.2.5.2.3)
1.2.5.2.1 Standard molbloc-S Calibrations
Measurement Update Rate 1 second
Range Depends on molbloc-S pressure dependent calibration type
(see Section 1.2.5.2.2)
Resolution 0.0015 % of FS
Linearity ±0.05 % of reading
Repeatability ±0.05 % of reading
Precision1±0.06 % of reading

MOLBOX1+™/MOLBOX1+S, MOLBLOC TERMINAL OPERATION AND MAINTENANCE MANUAL
© 1995 - 2010 Fluke Corporation, DH Instruments Division Page 10
Predicted Stability2
(1 year)
±0.05 % of reading
Measurement Uncertainty3
With SP molbloc-S
calibration
A350K ±0.2 % of reading from 50 to 200 kPa
A700K ±0.2 % of reading from 50 to 500 kPa
S A1.4M ±0.2 % of reading from 100 to 500 kPa
±0.2 % of 100 kPa flow from 50 to 100 kPa
S A2M ±0.2 % of reading from 200 to 500 kPa
±
0.2 % of 200 kPa flow from 50 to 200 kPa
Measurement Uncertainty3
With LP molbloc-S calibration
A350K ±0.2 % of reading from 20 to 200 kPa
A700K ±0.2 % of reading from 50 to 200 kPa
±
0.2 % of 50 kPa flow from 20 to 50 kPa
Measurement Uncertainty3
With HP molbloc-S
calibration
A700K ±0.2 % of reading from 200 to 500 kPa
S A1.4M ±0.2 % of reading from 200 kPa to 1.2 MPa
S A2M ±0.2 % of reading from 200 kPa to 2 MPa
[1] Precision: Combined linearity, hysteresis, repeatability.
[2] Stability: Maximum change in zero and span over specified time period for typical molbox1+ and molbloc used
under typical conditions. As stability can only be predicted, stability for a specific molbloc and molbox1+ should
be established from experience.
[3] Measurement uncertainty (accuracy): Maximum deviation of the molbox1+ flow indication from the true value of
the flow through the molbloc including precision, stability and DHI calibration standard measurement
uncertainty.
1.2.5.2.2 Premium molbloc-S Calibrations
Measurement Update
Rate 1 second
Range Depends on molbloc-S pressure dependent calibration type
(see Section 1.2.5.2.2)
Resolution 0.0015 % of FS
Linearity ±0.05 % of reading
Repeatability ±0.05 % of reading
Precision1±0.06 % of reading
Predicted Stability2
(1 year)
±0.03 % of reading
Measurement
Uncertainty3
With SP molbloc-S
calibration
A350K ±0.125 % of reading from 50 to 200 kPa
A700K ±0.125 % of reading from 50 to 500 kPa
S A1.4M ±0.125 % of reading from 100 to 500 kPa
±0.125 % of 100 kPa flow from 50 to 100 kPa
S A2M ±0.125 % of reading from 200 to 500 kPa
±
0.125 % of 200 kPa flow from 50 to 200 kPa
Measurement
Uncertainty3
With LP molbloc-S
calibration
A350K ±0.125 % of reading from 20 to 200 kPa
A700K ±0.125 % of reading from 50 to 200 kPa
±0.125 % of 50 kPa flow from 20 to 50 kPa
Measurement
Uncertainty3
With HP molbloc-S
calibration
A700K ±0.125 % of reading from 200 to 500 kPa
S A1.4M ±0.125 % of reading from 200 kPa to 1.2 MPa
S A2M ±0.125 % of reading from 200 kPa to 2 MPa
[1] Precision: Combined linearity, hysteresis, repeatability.
[2] Stability: Maximum change in zero and span over specified time period for typical molbox1+ and molbloc used
under typical conditions. As stability can only be predicted, stability for a specific molbloc and molbox1+ should
be established from experience.
[3] Measurement uncertainty (accuracy): Maximum deviation of the molbox1+ flow indication from the true value of
the flow through the molbloc including precision, stability and DHI calibration standard measurement
uncertainty.