Fluke Calibration CalPower 6331 User manual

6331
Calibration Bath
User’s Guide
January 2013
© 2013 Fluke Corporation. All rights reserved. Specifications are subject to change without notice.
All product names are trademarks of their respective companies.
Via Acquanera, 29 22100 Como
tel. 031.526.566 (r.a.) fax 031.507.984
[e-mail] www.calpower.it

Table of Contents
1 Before You Start . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 Symbols Used . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.2.1 WARNINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.2.2 CAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.3 Authorized Service Centers. . . . . . . . . . . . . . . . . . . . . . 5
2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3 Specifications and Environmental Conditions . . . . . . . . . . 9
3.1 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.2 Environmental Conditions. . . . . . . . . . . . . . . . . . . . . . 10
4 Quick Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.1 Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.2 Set Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.3 Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.4 Setting the Temperature . . . . . . . . . . . . . . . . . . . . . . . 14
5 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.1 Moving or Uncrating the Bath . . . . . . . . . . . . . . . . . . . 17
5.2 Bath Environment . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.3 Tipping Prevention Bracket Installation. . . . . . . . . . . . . . . 17
5.3.1 Installation On A Wood Floor . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.3.2 Installation On A Concrete Floor . . . . . . . . . . . . . . . . . . . . . . . . 18
5.3.3 Installation Of The Bath . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.4 “Dry-out” Period . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.5 Bath Preparation and Filling . . . . . . . . . . . . . . . . . . . . 19
5.6 Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6 Bath Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.2 Comparison Calibration . . . . . . . . . . . . . . . . . . . . . . . 21
6.3 Calibration of Multiple Probes . . . . . . . . . . . . . . . . . . . 22
7 Parts and Controls . . . . . . . . . . . . . . . . . . . . . . . . 23
i

7.1 Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
7.2 Bath Tank and Lid . . . . . . . . . . . . . . . . . . . . . . . . . . 24
7.3 Back Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
7.3.1 Fluid Expansion Reservoir . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
8 General Operation . . . . . . . . . . . . . . . . . . . . . . . . 27
8.1 Heat Transfer Fluid . . . . . . . . . . . . . . . . . . . . . . . . . 27
8.1.1 Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
8.1.2 Viscosity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
8.1.3 Specific Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
8.1.4 Thermal Conductivity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
8.1.5 Thermal Expansion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
8.1.6 Electrical Resistivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
8.1.7 Fluid Lifetime . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
8.1.8 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
8.1.9 Cost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
8.1.10 Commonly Used Fluids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
8.1.10.1 Water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
8.1.10.2 Ethylene Glycol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
8.1.10.3 Mineral Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
8.1.10.4 Silicone Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
8.1.11 Fluid Characteristics Charts. . . . . . . . . . . . . . . . . . . . . . . . . . . 31
8.1.11.1 Limitations and Disclaimer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
8.1.11.2 About the Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
8.2 Stirring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
8.3 Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
8.4 Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
8.5 Temperature Controller . . . . . . . . . . . . . . . . . . . . . . . 35
9 Controller Operation . . . . . . . . . . . . . . . . . . . . . . . 37
9.1 Bath Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . 37
9.2 Reset Cutout . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
9.3 Temperature Set-point . . . . . . . . . . . . . . . . . . . . . . . . 39
9.3.1 Programmable Set-points . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
9.3.2 Set-point Value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
9.3.3 Set-point Vernier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
9.4 Scan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
9.4.1 Scan Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
9.4.2 Scan Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
9.5 Temperature Scale Units . . . . . . . . . . . . . . . . . . . . . . 42
9.6 Ramp and Soak Program . . . . . . . . . . . . . . . . . . . . . . 43
9.6.1 Number of Program Set-points . . . . . . . . . . . . . . . . . . . . . . . . . 43
9.6.2 Set-points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
9.6.3 Program Soak Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
9.6.4 Program Function Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
9.6.5 Program Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
ii

9.7 Secondary Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . 45
9.8 Heater Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
9.9 Proportional Band . . . . . . . . . . . . . . . . . . . . . . . . . . 46
9.10 Cutout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
9.11 Controller Configuration . . . . . . . . . . . . . . . . . . . . . . 50
9.12 Probe Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . 50
9.12.1 R0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
9.12.2 ALPHA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
9.13 Operating Parameters . . . . . . . . . . . . . . . . . . . . . . . . 51
9.13.1 Cutout Reset Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
9.13.2 Boost Heater Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
9.14 Serial Interface Parameters . . . . . . . . . . . . . . . . . . . . . 52
9.14.1 Baud Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
9.14.2 Sample Period. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
9.14.3 Duplex Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
9.14.4 Linefeed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
9.15 IEEE-488 Parameters . . . . . . . . . . . . . . . . . . . . . . . . 54
9.15.1 Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
9.15.2 Transmission Termination . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
9.16 Calibration Parameters . . . . . . . . . . . . . . . . . . . . . . . 55
9.16.1 CTO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
9.16.2 CO and CG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
9.16.3 H and L . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
10 Digital Communication Interface . . . . . . . . . . . . . . . . 57
10.1 Serial Communications . . . . . . . . . . . . . . . . . . . . . . . 57
10.1.1 Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
10.1.2 Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
10.1.2.1 Baud Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
10.1.2.2 Sample Period. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
10.1.2.3 Duplex Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
10.1.2.4 Linefeed. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
10.1.3 Serial Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
10.2 IEEE-488 Communication (optional) . . . . . . . . . . . . . . . . 59
10.2.1 Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
10.2.1.1 Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
10.2.1.2 Transmission Termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
10.2.2 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
10.3 Interface Commands . . . . . . . . . . . . . . . . . . . . . . . . 59
11 Calibration Procedure . . . . . . . . . . . . . . . . . . . . . . 65
11.1 Calibration Points . . . . . . . . . . . . . . . . . . . . . . . . . . 65
11.2 Measuring the Set-point Error. . . . . . . . . . . . . . . . . . . . 65
11.3 Computing R0 and ALPHA . . . . . . . . . . . . . . . . . . . . . 66
11.4 Calibration Example. . . . . . . . . . . . . . . . . . . . . . . . . 66
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12 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
13 Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . 71
13.1 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
13.2 Comments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
13.2.1 EMC Directive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
13.2.1.1 Immunity Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
13.2.1.2 Emission Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
13.2.2 Low Voltage Directive (Safety) . . . . . . . . . . . . . . . . . . . . . . . . . 74
iv

v
Figures
Figure 1 Stir Baffle Fill Levels . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 2 Tipping Prevention Bracket Installation . . . . . . . . . . . . . . . . . 18
Figure 3 Front Panel Features . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 4 Chart Showing Usable Range Of Various Fluids . . . . . . . . . . . . 33
Figure 5 Controller Operation Flowchart . . . . . . . . . . . . . . . . . . . . . 38
Figure 6 Bath Temperature Fluctuation At Various Proportional Band Settings . 47
Figure 7 Serial Communications Cable Wiring . . . . . . . . . . . . . . . . . . 57
Figure 8 Calibration Example . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

vi
Tables
Table 1 International Electrical Symbols . . . . . . . . . . . . . . . . . . . . . 1
Table 2 Table of Bath Fluids . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Table 3 Program Mode Setting Actions . . . . . . . . . . . . . . . . . . . . . 45
Table 4 Proportional Band — Fluid Table . . . . . . . . . . . . . . . . . . . . 48
Table 5 Interface Command Summary . . . . . . . . . . . . . . . . . . . . . . 61
Table 5 Interface Command Summary continued . . . . . . . . . . . . . . . . 62
Table 5 Interface Command Summary continued . . . . . . . . . . . . . . . . 63

1 Before You Start
1.1 Symbols Used
Table 1 lists the International Electrical Symbols. Some or all of these symbols
may be used on the instrument or in this manual.
Symbol Description
AC (Alternating Current)
AC-DC
Battery
CE Complies with European Union Directives
DC
Double Insulated
Electric Shock
Fuse
PE Ground
Hot Surface (Burn Hazard)
Read the User’s Manual (Important Information)
Off
On
1
1 Before You Start
Symbols Used
Table 1 International Electrical Symbols

Symbol Description
Canadian Standards Association
OVERVOLTAGE (Installation) CATEGORY II, Pollution Degree 2 per IEC1010-1 re-
fers to the level of Impulse Withstand Voltage protection provided. Equipment of
OVERVOLTAGE CATEGORY II is energy-consuming equipment to be supplied from
the fixed installation. Examples include household, office, and laboratory appliances.
C-TIC Australian EMC Mark
The European Waste Electrical and Electronic Equipment (WEEE) Directive
(2002/96/EC) mark.
1.2 Safety Information
Use this instrument only as specified in this manual. Otherwise, the protection
provided by the instrument may be impaired.
The following definitions apply to the terms “Warning” and “Caution”.
•“WARNING” identifies conditions and actions that may pose hazards to
the user.
•“CAUTION” identifies conditions and actions that may damage the in-
strument being used.
1.2.1 WARNINGS
To avoid personal injury, follow these guidelines.
GENERAL
•DO NOT use the instrument for any application other than calibration
work. The instrument was designed for temperature calibration. Any other
use of the unit may cause unknown hazards to the user.
•DO NOT use the unit in environments other than those listed in the
User’s Guide.
•DO NOT overfill the bath. Overflowing extremely cold or hot fluid may
be harmful to the operator. See Section 5.5, Bath Preparation and Filling,
for specific instructions.
•Follow all safety guidelines listed in the user’s manual.
•Calibration Equipment should only be used by trained personnel.
•If this equipment is used in a manner not specified by the manufacturer,
the protection provided by the equipment may be impaired.
•Before initial use, or after transport, or after storage in humid or semi-hu-
mid environments, or anytime the instrument has not been energized for
more than 10 days, the instrument needs to be energized for a "dry-out"
6331 Calibration Bath
User’s Guide
2

period of 2 hours before it can be assumed to meet all of the safety re-
quirements of the IEC 1010-1. If the product is wet or has been in a wet
environment, take necessary measures to remove moisture prior to apply-
ing power such as storage in a low humidity temperature chamber operat-
ing at 50°C for 4 hours or more.
•Overhead clearance is required. Do not place the instrument under a cabi-
net or other structure. Always leave enough clearance to allow for safe
and easy insertion and removal of probes.
•The instrument is intended for indoor use only.
•The unit is a precision instrument. Although it has been designed for opti-
mum durability and trouble free operation, it must be handled with care.
Position the unit before the tank is filled with fluid by rolling it into place.
Do not attempt to carry the bath. DO NOT move a unit filled with fluid
(see Section 5.1, Moving or Uncrating the Bath).
BURN HAZARD
•Extremely cold temperatures may be present in this equipment. Freezer
burns and frostbite may result if personnel fail to observe safety precau-
tions.
•High temperatures may be present in this equipment. Fires and severe
burns may result if personnel fail to observe safety precautions.
•The drain tube and dust cover of the fluid expansion reservoir may be hot.
Handle them carefully and always be sure the drain tube is fully inserted
into the elbow of the dust cover.
•The drain tube of the fluid expansion reservoir is not designed to handle
large flow rates encountered by overfilling the tank. It is intended for ex-
panding fluid rates from heating only. Fill the tank only until the level
reaches the top of the baffle (see Figure 1 on page 13).
ELECTRICAL HAZARD
•These guidelines must be followed to ensure that the safety mechanisms
in this instrument will operate properly. This instrument must be plugged
into a 115 VAC (230 VAC optional), AC only electric outlet. The power
cord of the instrument is equipped with a three-pronged grounding plug
for your protection against electrical shock hazards. It must be plugged
directly into a properly grounded three-prong receptacle. The receptacle
must be installed in accordance with local codes and ordinances. Consult
a qualified electrician. DO NOT use an extension cord or adapter plug.
•DO use a ground fault interrupt device. This unit contains a fluid. A
ground fault device is advised in case fluid is present in the electrical sys-
tem and could cause an electrical shock.
•Always replace the power cord with an approved cord of the correct rat-
ing and type. If you have questions, contact an Authorized Service Center
(see Section 1.3).
3
1 Before You Start
Safety Information

•High voltage is used in the operation of this equipment. Severe injury or
death may result if personnel fail to observe the safety precautions. Before
working inside the equipment, turn off the power and disconnect the
power cord.
BATH FLUIDS
•Fluids used in this unit may produce noxious or toxic fumes under certain
circumstances. Consult the fluid manufacturer’s MSDS (Material Safety
Data Sheet). Proper ventilation and safety precautions must be observed.
•Utilization of a vent hood or other ventilation system is required for sili-
con oil at high temperatures.
•The unit is equipped with a soft cutout (user settable firmware) and a hard
cutout (set at the factory). Check the flash point, boiling point, or other
fluid characteristic applicable to the circumstances of the unit operation.
Ensure that the soft cutout is adjusted to the fluid characteristics of the ap-
plication.
1.2.2 CAUTIONS
•Always operate this instrument at room temperature between 41°F and
104°F (5°C to 40°C). Allow sufficient air circulation by leaving at least 6
inches (15 cm) of clearance around the instrument.
•When filling the tank, ensure the heating coils are completely covered.
DO NOT fill above the stir baffle (see Figure 1, on page 13).
•DO NOT overfill the bath. Overflowing fluid may damage the electrical
system. Be sure to allow for thermal expansion of the fluid as the bath
temperature increases. See Section 5.5, Bath Preparation and Filling, for
specific instructions.
•Regardless of the fluid used, DO NOT exceed the recommended fluid
viscosity.
•Read Section 6, Bath Use, before placing the unit into service.
•DO NOT turn on the bath without fluid in the tank and the heating coils
fully immersed. See Section 7.3.1, Fluid Expansion Reservoir, for infor-
mation on fluid expansion reservoir use.
•DO NOT change the values of the bath calibration constants from the fac-
tory set values. The correct setting of these parameters is important to the
safety and proper operation of the unit.
•The Factory Reset Sequence should be performed only by authorized
personnel if no other action is successful in correcting a malfunction. You
must have a copy of the most recent Report of Test to restore the test pa-
rameters.
•DO NOT operate this instrument in an excessively wet, oily, dusty, or
dirty environment. Silicone oils require additional ventilation to prevent
an oily, dirty environment.
6331 Calibration Bath
User’s Guide
4

•Silicon oil can condense on the bath during normal operation. See Section
12, Maintenance, for cleaning instructions.
•Most probes have handle temperature limits. Be sure that the probe handle
temperature limit is not exceeded in the air above the instrument.
•The instrument and any thermometer probes used with it are sensitive in-
struments that can be easily damaged. Always handle these devices with
care. Do not allow them to be dropped, struck, stressed, or overheated.
1.3 Authorized Service Centers
Please contact one of the following authorized Service Centers to coordinate
service on your Hart product:
Fluke Corporation, Hart Scientific Division
799 E. Utah Valley Drive
American Fork, UT 84003-9775
USA
Phone: [phone]
Telefax: +1.801.763.1010
E-mail: [email protected]
Fluke Nederland B.V.
Customer Support Services
Science Park Eindhoven 5108
5692 EC Son
NETHERLANDS
Phone: [phone]
Telefax: [phone]
E-mail: [email protected]
Fluke Int'l Corporation
Service Center - Instrimpex
Room 2301 Sciteck Tower
22 Jianguomenwai Dajie
Chao Yang District
Beijing 100004, PRC
CHINA
5
1 Before You Start
Authorized Service Centers

Phone: [phone]
Telefax: [phone]
E-mail: [email protected]
Fluke South East Asia Pte Ltd.
Fluke ASEAN Regional Office
Service Center
60 Alexandra Terrace #03-16
The Comtech (Lobby D)
118502
SINGAPORE
Phone: [phone]
Telefax: [phone]
E-mail: [email protected]
When contacting these Service Centers for support, please have the following
information available:
•Model Number
•Serial Number
•Voltage
•Complete description of the problem
6331 Calibration Bath
User’s Guide
6

2 Introduction
The Hart Scientific Model 6331 is a compact constant temperature bath useful
in temperature calibration and other applications requiring stable temperatures.
An innovative state of the art solid-state temperature controller has been incor-
porated which maintains the bath temperature within extreme stability. The
temperature controller uses a micro-controller to execute the many operating
functions.
User interface is provided by the 8-digit LED display and four key-switches.
Digital remote communications is standard with an RS-232 and optional with
an IEEE-488 interface.
The 6331 bath was designed to be compact and low cost without compromising
performance. The 6331 bath operates over a wide temperature range from 35°C
to 300°C.
The 6331 features:
•Rapid heating and cooling
•RS-232 (standard) and IEEE-488 (optional)
•Temperature scan rate control
•Ramp and soak functions
•Compact size
•Eight set-point memory
•Adjustable readout in °C or °F
•Automatic boost heat control
7
2 Introduction

3 Specifications and Environmental
Conditions
3.1 Specifications
Range 35°C to 300°C
Stability (2 sigma) ±0.007°C at 100°C (oil 5012)
±0.010°C at 200°C (oil 5017)
±0.015°C at 300°C (oil 5017)
Uniformity ±0.007°C at 100°C (oil 5012)
±0.017°C at 200°C (oil 5017)
±0.025°C at 300°C (oil 5017)
Heating Time
†
(with boost) 140 minutes, from 35°C to 300°C (oil 5017)
Cooling Time 900 minutes, from 300°C to 100°C (oil 5017)
Stabilization Time 15–20 minutes
Temperature Setting Digital display with push-button data entry
Set-point Resolution 0.01°C; high-resolution mode, 0.00018°C
Display Resolution 0.01°C
Digital Setting Accuracy ±1°C
Digital Setting Repeatability ±0.01°C
Control Heater 700 Watts
Boost Heater 900 Watts
Access Opening 6.8" x 4.7" (172 x 119 mm)
Depth 18" (457 mm) without liquid-in-glass calibration kit
19" (482 mm) with liquid-in-glass calibration kit
Wetted Parts 304 Stainless Steel
Power
†
115 VAC (±10%), 50/60 Hz, 14.8 A, 1750 W
[230 VAC (±10%), 50/60 Hz, 7.4 A, 1860 W
System Fuse 115V: 20A 250V fast blow
230V: 10A 250V fast blow
Volu me 4.2 gallons (15.9 liters)
Weight 90 lb. (41 kg)
Dimensions 14" W x 31" D x 42" H (356 x 788 x 1067 mm), 37" (940 mm) from
floor to tank access opening
Safety OVERVOLTAGE (Installation) CATEGORY II, pollution Degree 2 per
IEC 1010-1
Interface Package RS-232 included, IEEE-488 optional
†
Rated at listed 115 V (or optional 230 V)
9
3 Specifications and Environmental Conditions
Specifications

3.2 Environmental Conditions
Although the instrument has been designed for optimum durability and trou-
ble-free operation, it must be handled with care. The instrument should not be
operated in an excessively dusty or dirty environment. Maintenance and clean-
ing recommendations can be found in the Maintenance Section of this manual.
The instrument operates safely under the following conditions:
•temperature range: 5–40°C (41–104°F)
•ambient relative humidity: maximum 80% for temperatures < 31°C de-
creasing linearly to 50% at 40°
•pressure: 75kPa - 106kPa
•mains voltage within ± 10% of nominal
•vibrations in the calibration environment should be minimized
•altitude less than 2,000 meters
•indoor use only
6331 Calibration Bath
User’s Guide
10

4 Quick Start
CAUTION: READ SECTION 6 ENTITLED BATH USE before placing the
bath in service. Incorrect handling can damage the bath and void the war-
ranty.
This section gives a brief summary of the steps required to set up and operate
the bath. This should be used as a general overview and reference and not as a
substitute for the remainder of the manual. Please read Section 5, Installation,
through Section 8, General Operation, carefully before operating the bath.
4.1 Unpacking
Unpack the bath carefully and inspect it for any damage that may have oc-
curred during shipment. If there is shipping damage, notify the carrier immedi-
ately. Verify that all components are present:
•6331 Bath
•Access Hole Cover
•Fluid Expansion Reservoir with Cover (attached to the back of the bath)
•User's Guide
•RS-232 Cable
•Report of Test
•Drain Valve (attached to the bath)
•9930 Interface-it Software and User's Guide
•Tipping Prevention Bracket (including mounting hardware for wood or
concrete floor)
•2019-DCB Kit, Liquid-in-Glass (LIG) Adapter and Carousel (Optional)
•2069 Scope, Liquid-in-Glass (LIG) with mounts (Optional)
If you are missing any item, please call an Authorized Service Center (see Sec-
tion 1.3 on page 5).
11
4 Quick Start
Unpacking

4.2 Set Up
WARNING: The instrument is equipped with a soft cutout (user settable
firmware) and a hard cutout (set at the factory). Check the flash point,
boiling point, or other fluid characteristic applicable to the circumstances
of the instrument operation. Ensure that the soft cutout is adjusted to the
fluid characteristics of the application. As a guideline, the soft cutout
should be set 10°C to 15°C below the flash point of the bath fluid. See
Section 8.1, Heat Transfer Fluid, for specific information on bath fluids
and Section 9.10, Cutout.
Set up of the bath requires careful unpacking and placement of the bath, filling
the bath with fluid, and connecting power. Consult Section 5, Installation, for
detailed instructions for proper installation of the bath. Be sure to place the
bath in a safe, clean and level location. Refer to Section 5.3, Tipping Prevention
Bracket Installation.
Fill the bath tank with an appropriate fluid. For operation at moderate bath tem-
peratures, clean distilled water works well. Carefully pour the fluid into the
bath tank through the large rectangular access hole above the tank avoiding
spilling any fluid.
6331 Calibration Bath
User’s Guide
12

CAUTION: When filling the tank, ensure the heating coils are completely
covered. DO NOT FILL ABOVE THE STIR BAFFLE. See Figure 1.
An overflow drain is provided for excess bath fluid due to expansion. This
drains the fluid into the fluid expansion reservoir for reuse. See Section 7.3.1,
Fluid Expansion Reservoir, for details in using the reservoir.
NOTE: As the temperature of the bath increases the fluid level will in-
crease, see Section 6 on page 21.
13
4 Quick Start
Set Up
MIN FILL
Maximum Fill Level
Top of Baffle
Minimum Fill
Level Line
Figure 1 Stir Baffle Fill Levels