Thermo Scientific 48i User manual

Model 48i
Instruction Manual
Gas Filter Correlation CO Analyzer
Part Number 101891-00
10Aug2017

© 2007 Thermo Fisher Scientific Inc. All rights reserved.
Specifications, terms and pricing are subject to change. Not all products are available in all countries. Please
consult your local sales representative for details.
Thermo Fisher Scientific
Air Quality Instruments
27 Forge Parkway
Franklin, MA 02038
1-508-520-0430
www.thermo.com/aqi

Thermo Fisher Scientific WEEE Compliance
WEEE Compliance
This product is required to comply with the European Union’s Waste
Electrical & Electronic Equipment (WEEE) Directive 2002/96/EC. It is
marked with the following symbol:
Thermo Fisher Scientific has contracted with one or more
recycling/disposal companies in each EU Member State, and this product
should be disposed of or recycled through them. Further information on
Thermo Fisher Scientific’s compliance with these Directives, the recyclers
in your country, and information on Thermo Fisher Scientific products
which may assist the detection of substances subject to the RoHS Directive
are available at: www.thermo.com/WEEERoHS.

Thermo Fisher Scientific WEEE Compliance
Reference Method Designation
The Thermo Scientific Model 48iis designated by the United States
Environmental Protection Agency (USEPA) as a Reference Method for CO
as set forth in the U.S. Environmental Protection Agency regulations at
Title 40, Part 53 of the U.S. Code of Fereral Regulations.
Designated Reference Method Number: RFCA-0981-054
EPA Designation Date: September 23, 1981 (amended for Model 48i)
The Model 48iCO Analyzer meets EPA reference designation
requirements when operated with the following:
Range 0-1 to 100 ppm
Averaging Time 10 to 300 seconds
Temperature Range 20 to 35 °C
Line Voltage 90 to 110 Vac @50/60 Hertz
105 to 125 Vac @50/60 Hertz
210 to 250 Vac @50/60 Hertz
Pressure Compensation ON or OFF
Temperature Compensation ON or OFF
Flow Rate 0.5 to 2 L/min
RS-232/RS-485 Interface
With or without the following options:
Teflon Particulate Filter
Internal Zero/Span and Sample Valves
Internal Zero Air Scrubber
Rack Mounts
I/O Expansion Board

Thermo Fisher Scientific Model 48iInstruction Manual i
About This Manual
This manual provides information about installing, operating, maintaining,
and servicing the Model 48iCO gas analyzer. It also contains important
alerts to ensure safe operation and prevent equipment damage. The manual
is organized into the following chapters and appendices to provide direct
access to specific operation and service information.
●Chapter 1 “Introduction” provides an overview of product features,
describes the principles of operation, and lists the specifications.
●Chapter 2 “Installation” describes how to unpack, setup, and startup
the analyzer.
●Chapter 3 “Operation” describes the front panel display, the front
panel pushbuttons, and the menu-driven firmware.
●Chapter 4 “Calibration” provides the procedures for calibrating the
analyzer and describes the required equipment.
●Chapter 5 “Preventive Maintenance” provides maintenance procedures
to ensure reliable and consistent instrument operation.
●Chapter 6 “Troubleshooting” presents guidelines for diagnosing
analyzer failures, isolating faults, and includes recommended actions for
restoring proper operation.
●Chapter 7 “Servicing” presents safety alerts for technicians working on
the analyzer, step-by-step instructions for repairing and replacing
components, and a replacement parts list. It also includes contact
information for product support and technical information.
●Chapter 8 “System Description” describes the function and location of
the system components, provides an overview of the firmware structure,
and includes a description of the system electronics and input/output
connections.
●Chapter 9 “Optional Equipment” describes the optional equipment
that can be used with this analyzer.
●Appendix A “Warranty” is a copy of the warranty statement.
●Appendix B “C-Link Protocol Commands” provides a description of
the C-Link protocol commands that can be used to remotely control an
analyzer using a host device such as a PC or datalogger.

About This Manual
Safety
ii Model 48iInstruction Manual Thermo Fisher Scientific
●Appendix C “MODBUS Protocol” provides a description of the
MODBUS Protocol Interface and is supported both over RS-232/485
(RTU protocol) as well as TCP/IP over Ethernet.
●Appendix D “Gesytec (Bayern-Hessen) Protocol” provides a
description of the Gesytec (Bayern-Hessen or BH) Protocol Interface
and is supported both over RS-232/485 as well as TCP/IP over
Ethernet.
Review the following safety information carefully before using the analyzer.
This manual provides specific information on how to operate the analyzer,
however, if the analyzer is used in a manner not specified by the
manufacturer, the protection provided by the equipment may be impaired.
This manual contains important information to alert you to potential safety
hazards and risks of equipment damage. Refer to the following types of
alerts you may see in this manual.
Safety and Equipment Damage Alert Descriptions
Alert Description
DANGER A hazard is present that could result in death or serious
personal injury if the warning is ignored. ▲
WARNING A hazard or unsafe practice could result in serious
personal injury if the warning is ignored. ▲
CAUTION A hazard or unsafe practice could result in minor to
moderate personal injury if the warning is ignored. ▲
Equipment Damage A hazard or unsafe practice could result in property
damage if the warning is ignored. ▲
Safety and Equipment Damage Alerts in this Manual
Alert Description
WARNING The Model 48iis supplied with a three-wire grounded
power cord. Under no circumstances should this
grounding system be defeated. ▲
If the equipment is operated in a manner not specified by
the manufacturer, the protection provided by the
equipment may be impaired. ▲
The service procedures in this manual are restricted to
qualified service personnel only. ▲
Safety
Safety and Equipment
Damage Alerts

About This Manual
FCC Compliance
Thermo Fisher Scientific Model 48iInstruction Manual iii
Alert Description
CAUTION If the LCD panel breaks, do not let the liquid crystal
contact your skin or clothes. If the liquid crystal contacts
your skin or clothes, wash it off immediately using soap
and water. ▲
Equipment Damage Do not attempt to lift the analyzer by the cover or other
external fittings. ▲
Disconnect the serial cable before changing RS-232 and
RS-485 selection to prevent damage to any equipment
currently connected to the analyzer. ▲
Some internal components can be damaged by small
amounts of static electricity. A properly grounded
antistatic wrist strap must be worn while handling any
internal component. ▲
Do not use solvents or other cleaning products to clean
the outside case. ▲
Do not remove the LCD panel or frame from the LCD
module. ▲
The LCD polarizing plate is very fragile, handle it
carefully. ▲
Do not wipe the LCD polarizing plate with a dry cloth, as
it may easily scratch the plate. ▲
Do not use alcohol, acetone, MEK or other ketone based
or aromatic solvent to clean the LCD module, but rather
use a soft cloth moistened with a naphtha cleaning
solvent. ▲
Do not place the LCD module near organic solvents or
corrosive gases. ▲
Do not shake or jolt the LCD module. ▲
Changes or modifications to this unit not expressly approved by the party
responsible for compliance could void the user’s authority to operate the
equipment.
Note This equipment has been tested and found to comply within the
limits for a Class A digital device, pursuant to Part 15 of the FCC Rules.
These limits are designed to provide reasonable protection against harmful
interference when the equipment is operated in a commercial environment.
This equipment generates, uses, and can radiate radio frequency energy
and, if not installed and used in accordance with the instruction manual,
may cause harmful interference to radio communications. Operation of this
equipment in a residential area is likely to cause harmful interference, in
FCC Compliance

About This Manual
WEEE Symbol
iv Model 48iInstruction Manual Thermo Fisher Scientific
which case the user will be required to correct the interference at his or her
own expense. ▲
The following symbol and description identify the WEEE marking used on
the instrument and in the associated documentation.
Symbol Description
Marking of electrical and electronic equipment which applies to waste
electrical and electronic equipment falling under the Directive 2002/96/EC
(WEEE) and the equipment that has been put on the market after 13 August
2005. ▲
Service is available from exclusive distributors worldwide. Contact one of
the phone numbers below for product support and technical information
or visit us on the web at www.thermo.com/aqi.
1-866-282-0430 Toll Free
1-508-520-0430 International
W
EEE Symbol
W
here to Get Help

Contents
Thermo Fisher Scientific Model 48iInstruction Manual v
Contents
Introduction........................................................................................................ 1-1
Principle of Operation ........................................................................ 1-2
Specifications ...................................................................................... 1-3
Installation ......................................................................................................... 2-1
Lifting................................................................................................. 2-1
Unpacking and Inspection .................................................................. 2-1
Setup Procedure.................................................................................. 2-3
Connecting External Devices .............................................................. 2-5
Terminal Board PCB Assemblies...................................................... 2-5
I/O Terminal Board...................................................................... 2-5
D/O Terminal Board.................................................................... 2-7
25-Pin Terminal Board ................................................................. 2-8
Startup.............................................................................................. 2-10
Operation............................................................................................................ 3-1
Display................................................................................................ 3-1
Pushbuttons........................................................................................ 3-2
Soft Keys.......................................................................................... 3-3
Alphanumeric Entry Screen ............................................................. 3-4
Firmware Overview............................................................................. 3-4
Power-Up Screen ............................................................................. 3-6
Run Screen....................................................................................... 3-6
Custom Run Screens..................................................................... 3-7
Main Menu...................................................................................... 3-8
Range Menu ....................................................................................... 3-8
Single Range Mode .......................................................................... 3-9
Dual Range Mode.......................................................................... 3-10
Auto Range Mode.......................................................................... 3-11
Gas Units....................................................................................... 3-13
CO Range...................................................................................... 3-14
Set Custom Ranges ........................................................................ 3-15
Custom Ranges........................................................................... 3-15
Averaging Time................................................................................. 3-16
Calibration Factors Menu ................................................................. 3-16
CO Background............................................................................. 3-17
CO Coefficient .............................................................................. 3-18
O2Background .............................................................................. 3-18
O2Coefficient................................................................................ 3-19
Chapter 1
Chapter 2
Chapter 3

Contents
vi Model 48iInstruction Manual Thermo Fisher Scientific
Reset User Calibration Defaults ..................................................... 3-20
Calibration Menu ............................................................................. 3-20
Calibrate CO Background.............................................................. 3-21
Calibrate CO Coefficient ............................................................... 3-21
Zero/Span Check ........................................................................... 3-22
Next Time .................................................................................. 3-22
Period Hours............................................................................... 3-23
Total Duration Hour .................................................................. 3-23
Zero/Span/Purge Duration Minutes ........................................... 3-23
Zero/Span Averaging Time ......................................................... 3-24
Zero/Span Calibration Reset ....................................................... 3-24
Zero/Span Ratio.......................................................................... 3-24
Calibrate O2Background ............................................................... 3-25
Calibrate O2Coefficient................................................................. 3-25
Instrument Controls Menu ............................................................... 3-25
Datalogging Settings ...................................................................... 3-26
Select Srec/Lrec ........................................................................... 3-27
View Logged Data....................................................................... 3-27
Number of Records..................................................................... 3-27
Date and Time............................................................................ 3-28
Erase Log .................................................................................... 3-29
Select Content............................................................................. 3-29
Choose Field Data....................................................................... 3-29
Concentrations............................................................................ 3-30
Corrected Concentrations ........................................................... 3-30
Other Measurements................................................................... 3-31
Analog Inputs.............................................................................. 3-31
Commit Content ........................................................................ 3-32
Reset to Default Content ............................................................ 3-32
Configure Datalogging................................................................ 3-33
Logging Period Min.................................................................... 3-33
Memory Allocation Percent......................................................... 3-33
Data Treatment .......................................................................... 3-34
Flag Status Data .......................................................................... 3-34
Communication Settings................................................................ 3-35
Serial Settings.............................................................................. 3-35
Baud Rate ................................................................................... 3-35
Data Bits..................................................................................... 3-36
Parity .......................................................................................... 3-36
Stop Bits ..................................................................................... 3-36
RS-232/RS-485 Selection............................................................ 3-37
Instrument ID............................................................................. 3-37
Gesytec Serial No........................................................................ 3-38
Communication Protocol............................................................ 3-38
Streaming Data Configuration .................................................... 3-39
Streaming Data Interval .............................................................. 3-40

Contents
Thermo Fisher Scientific Model 48iInstruction Manual vii
Add Labels .................................................................................. 3-40
Prepend Timestamp.................................................................... 3-40
Add Flags.................................................................................... 3-40
Choose Stream Data Item ........................................................... 3-41
Concentrations............................................................................ 3-41
Corrected Concentrations ........................................................... 3-41
Other Measurements................................................................... 3-42
Analog Inputs ............................................................................. 3-42
TCP/IP Settings.......................................................................... 3-43
Use DHCP ................................................................................. 3-43
IP Address................................................................................... 3-44
Netmask ..................................................................................... 3-44
Default Gateway ......................................................................... 3-44
Host Name ................................................................................. 3-45
Network Time Protocol Server.................................................... 3-45
I/O Configuration ......................................................................... 3-45
Output Relay Settings................................................................. 3-46
Logic State .................................................................................. 3-46
Instrument State ......................................................................... 3-47
Alarms......................................................................................... 3-47
Non-Alarm ................................................................................. 3-48
Digital Input Settings.................................................................. 3-48
Logic State .................................................................................. 3-49
Instrument Action....................................................................... 3-49
Analog Output Configuration (Select Channel).......................... 3-49
Allow Over/Under Range............................................................ 3-50
Analog Output Configuration (Select Action)............................. 3-50
Select Range................................................................................ 3-51
Minimum and Maximum Value ................................................. 3-51
Choose Signal to Output ............................................................ 3-52
Analog Input Configuration........................................................ 3-54
Descriptor................................................................................... 3-54
Units........................................................................................... 3-55
Decimal Places ............................................................................ 3-55
Number of Table Points ............................................................. 3-55
Table Point ................................................................................. 3-56
Volts ........................................................................................... 3-56
User Value .................................................................................. 3-57
Temperature Compensation .......................................................... 3-57
Pressure Compensation.................................................................. 3-58
O2Compensation .......................................................................... 3-58
Screen Contrast.............................................................................. 3-59
Service Mode ................................................................................. 3-59
Date/Time ..................................................................................... 3-60
Timezone....................................................................................... 3-60
Diagnostics Menu............................................................................. 3-61

Contents
viii Model 48iInstruction Manual Thermo Fisher Scientific
Program Versions........................................................................... 3-61
Voltages ......................................................................................... 3-62
Motherboard Voltages................................................................. 3-62
Interface Board Voltages ............................................................. 3-62
I/O Board Voltages ..................................................................... 3-63
Temperatures ................................................................................. 3-63
Pressure.......................................................................................... 3-63
Flow............................................................................................... 3-64
Sample/Reference Ratio ................................................................. 3-64
AGC Intensity................................................................................ 3-64
Motor Speed .................................................................................. 3-65
O2Sensor Readings........................................................................ 3-65
Analog Input Readings................................................................... 3-65
Analog Input Voltages.................................................................... 3-66
Digital Inputs................................................................................. 3-66
Relay States .................................................................................... 3-66
Test Analog Outputs...................................................................... 3-67
Set Analog Outputs..................................................................... 3-67
Instrument Configuration .............................................................. 3-67
Contact Information ...................................................................... 3-68
Alarms Menu .................................................................................... 3-68
Internal Temperature ..................................................................... 3-69
Min and Max Internal Temperature Limits................................. 3-69
Bench Temperature........................................................................ 3-70
Min and Max Bench Temperature Limits ................................... 3-70
Pressure.......................................................................................... 3-70
Min and Max Pressure Limits ..................................................... 3-71
Sample Flow .................................................................................. 3-71
Min and Max Sample Flow Limits .............................................. 3-72
Bias Voltage ................................................................................... 3-72
Min and Max Bias Voltage Limits............................................... 3-72
AGC Intensity................................................................................ 3-73
Min and Max AGC Intensity Limits ........................................... 3-73
Motor Speed .................................................................................. 3-73
Zero and Span Check..................................................................... 3-74
Max Zero and Span Offset .......................................................... 3-74
Zero and Span Auto Calibration .................................................... 3-74
Concentration................................................................................ 3-75
Min and Max Concentration Limits ........................................... 3-75
Min Trigger Concentration......................................................... 3-76
O2Concentration........................................................................... 3-76
Min and Max O2Concentration Limits ...................................... 3-76
Min Trigger ................................................................................ 3-77
External Alarms.............................................................................. 3-77
Service Menu .................................................................................... 3-78
Range Mode Select......................................................................... 3-78

Contents
Thermo Fisher Scientific Model 48iInstruction Manual ix
Pressure Calibration ....................................................................... 3-79
Calibrate Pressure Zero ............................................................... 3-79
Calibrate Pressure Span............................................................... 3-80
Restore Default Pressure Calibration........................................... 3-80
Flow Calibration ............................................................................ 3-81
Calibrate Flow Zero .................................................................... 3-81
Calibrate Flow Span.................................................................... 3-81
Restore Default Flow Calibration................................................ 3-82
Initial Sample/Reference Ratio....................................................... 3-82
Multi-Point Calibration ................................................................. 3-83
Calibrate Point 1/2/3 .................................................................. 3-83
Coefficients................................................................................. 3-84
Default Coefficients .................................................................... 3-84
Preamp Board Calibration ............................................................. 3-84
Temperature Calibration................................................................ 3-85
Analog Output Calibration ............................................................ 3-85
Analog Output Calibrate Zero .................................................... 3-86
Analog Output Calibrate Full-Scale ............................................ 3-86
Analog Input Calibration ............................................................... 3-87
Analog Input Calibrate Zero ....................................................... 3-87
Analog Input Calibrate Full-Scale ............................................... 3-88
O2Correction Concentration......................................................... 3-88
Dilution Ratio................................................................................ 3-89
Setup Run Screens ......................................................................... 3-89
Edit Run Screen.......................................................................... 3-90
Edit Title .................................................................................... 3-90
Enabled....................................................................................... 3-90
Number of Items ........................................................................ 3-91
Select Run Screen Item ............................................................... 3-91
Concentrations............................................................................ 3-92
Corrected Concentrations ........................................................... 3-92
Other Measurements................................................................... 3-93
Analog Inputs ............................................................................. 3-93
Display Pixel Test .......................................................................... 3-93
Restore User Defaults..................................................................... 3-94
Password ........................................................................................... 3-94
Set Password .................................................................................. 3-95
Lock Instrument ............................................................................ 3-95
Lock/Unlock and Local/Remote Operation ................................ 3-95
Change Password ........................................................................... 3-96
Remove Password .......................................................................... 3-96
Unlock Instrument ........................................................................ 3-96
Calibration.......................................................................................................... 4-1
Equipment Required........................................................................... 4-1
CO Concentration Standard............................................................ 4-1
Chapter 4

Contents
xModel 48iInstruction Manual Thermo Fisher Scientific
Zero Air Generator........................................................................... 4-1
Compression ................................................................................. 4-2
Drying .......................................................................................... 4-2
Scrubbing...................................................................................... 4-2
Flow Meter(s) and Controller(s)....................................................... 4-2
Pressure Regulator for CO Standard Cylinder.................................. 4-2
Mixing Chamber.............................................................................. 4-3
Output Manifold ............................................................................. 4-3
Pre-Calibration ................................................................................... 4-3
Calibration.......................................................................................... 4-3
Connect the Instrument................................................................... 4-3
Zero Adjust...................................................................................... 4-4
Span Adjust...................................................................................... 4-5
Calibration Frequency...................................................................... 4-6
Periodic Zero and Span Checks........................................................... 4-6
HI and LO Multi-Point Calibration ................................................... 4-7
Default Coefficients ......................................................................... 4-7
Cal Point 1, 2, and 3 Adjust............................................................. 4-7
References ........................................................................................... 4-9
Preventive Maintenance .................................................................................5-1
Safety Precautions ............................................................................... 5-1
Replacement Parts............................................................................... 5-2
Cleaning the Outside Case.................................................................. 5-2
Cleaning the Optics ............................................................................ 5-2
IR Source Replacement ....................................................................... 5-3
Fan Filter Inspection and Cleaning ..................................................... 5-3
Leak Test and Pump Check Out......................................................... 5-4
External Leaks.................................................................................. 5-4
Leaks Across the Optional Zero/Span and Sample Solenoid Valves.. 5-5
Pump Rebuilding................................................................................ 5-5
Disassembly .................................................................................. 5-5
Assembly with New Diaphragm and Valve.................................... 5-8
Troubleshooting.................................................................................................6-1
Safety Precautions ............................................................................... 6-1
Troubleshooting Guides...................................................................... 6-1
Board-Level Connection Diagrams ..................................................... 6-5
Connector Pin Descriptions................................................................ 6-7
Service Locations............................................................................... 6-20
Servicing.............................................................................................................7-1
Safety Precautions ............................................................................... 7-3
Firmware Updates............................................................................... 7-4
Accessing the Service Mode................................................................. 7-4
Chapter 5
Chapter 6
Chapter 7

Contents
Thermo Fisher Scientific Model 48iInstruction Manual xi
Replacement Parts List........................................................................ 7-4
Cable List............................................................................................ 7-6
External Device Connection Components .......................................... 7-6
Removing the Measurement Case Assembly and Lowering the Partition
Panel................................................................................................... 7-8
Fuse Replacement ............................................................................... 7-9
Fan/Filter Replacement..................................................................... 7-10
IR Source Replacement..................................................................... 7-11
Filter Wheel Replacement................................................................. 7-12
Chopper Motor Replacement............................................................ 7-14
Optical Bench Replacement.............................................................. 7-15
Optical Switch Replacement ............................................................. 7-16
Bench Heater Assembly Replacement ............................................... 7-17
Detector/Preamplifier Assembly Replacement................................... 7-18
Preamp Board Calibration ................................................................ 7-20
Pump Replacement........................................................................... 7-20
Pressure Transducer Replacement ..................................................... 7-21
Pressure Transducer Calibration........................................................ 7-22
Flow Transducer Replacement .......................................................... 7-24
Flow Transducer Calibration ............................................................ 7-25
Capillary Cleaning or Replacement................................................... 7-26
Optional Zero/Span and Sample Solenoid Valve Replacement.......... 7-27
Analog Output Testing ..................................................................... 7-28
Analog Output Calibration ............................................................... 7-30
Analog Input Calibration .................................................................. 7-31
Calibrating the Input Channels to Zero Volts ................................ 7-31
Calibrating the Input Channels to Full-Scale ................................. 7-32
Ambient Temperature Calibration .................................................... 7-33
I/O Expansion Board (Optional) Replacement ................................. 7-34
Internal O2Sensor (Optional) Replacement...................................... 7-36
Digital Output Board Replacement .................................................. 7-36
Motherboard Replacement................................................................ 7-37
Measurement Interface Board Replacement ...................................... 7-38
Front Panel Board Replacement........................................................ 7-39
LCD Module Replacement............................................................... 7-40
Service Locations............................................................................... 7-41
System Description .......................................................................................... 8-1
Hardware............................................................................................ 8-1
Optical Bench.................................................................................. 8-2
Band-pass Filter ............................................................................... 8-2
Bench Heater Board......................................................................... 8-2
Chopper Motor................................................................................ 8-2
Optical Pickup................................................................................. 8-3
Gas Filter Wheel .............................................................................. 8-3
Infrared Source ................................................................................ 8-3
Chapter 8

Contents
xii Model 48iInstruction Manual Thermo Fisher Scientific
Pre-amplifier Assembly with IR Detector ......................................... 8-3
Sample Flow Sensor ......................................................................... 8-3
Pressure Transducer ......................................................................... 8-3
Capillary .......................................................................................... 8-3
Pump ............................................................................................... 8-3
Purge Flow Switch (optional)........................................................... 8-3
Firmware............................................................................................. 8-3
Instrument Control.......................................................................... 8-4
Monitoring Signals........................................................................... 8-4
Output Communication .................................................................. 8-4
Electronics .......................................................................................... 8-5
Motherboard.................................................................................... 8-5
Measurement Interface Board .......................................................... 8-6
Measurement Interface Board Connectors..................................... 8-6
Flow Sensor Assembly ...................................................................... 8-6
Pressure Sensor Assembly ................................................................. 8-6
Bench Heater Board......................................................................... 8-7
Pre-amp Board Assembly ................................................................. 8-7
Digital Output Board....................................................................... 8-7
I/O Expansion Board (Optional) ..................................................... 8-7
Front Panel Connector Board .......................................................... 8-7
I/O Components................................................................................. 8-8
Analog Voltage Outputs................................................................... 8-8
Analog Current Outputs (Optional) ................................................ 8-8
Analog Voltage Inputs (Optional) .................................................... 8-9
Digital Relay Outputs ...................................................................... 8-9
Digital Inputs................................................................................... 8-9
Serial Ports ..................................................................................... 8-10
RS-232 Connection ....................................................................... 8-10
RS-485 Connection ....................................................................... 8-11
Ethernet Connection...................................................................... 8-11
External Accessory Connector ........................................................ 8-11
Optional Equipment...........................................................................................9-1
Internal Zero/Span Assembly .............................................................. 9-1
Internal Oxygen (O2) Sensor............................................................... 9-1
Internal O2Sensor Calibration......................................................... 9-2
Alternate Sensor Calibration ............................................................ 9-3
Internal Zero Air Scrubber .................................................................. 9-4
Filter Wheel Purge .............................................................................. 9-4
Calibration Note.............................................................................. 9-5
Teflon Particulate Filter ...................................................................... 9-5
I/O Expansion Board Assembly........................................................... 9-5
25-Pin Terminal Board Assembly..................................................... 9-5
Terminal Block and Cable Kits ........................................................... 9-5
Cables ................................................................................................. 9-6
Chapter 9

Contents
Thermo Fisher Scientific Model 48iInstruction Manual xiii
Mounting Options.............................................................................. 9-7
Warranty.............................................................................................................A-1
C-Link Protocol Commands ............................................................................B-1
Instrument Identification Number......................................................B-1
Commands .........................................................................................B-2
Entering Units in PPB .....................................................................B-3
Convert Concentration Formats ......................................................B-3
Commands List................................................................................B-3
Measurements...................................................................................B-10
Alarms...............................................................................................B-14
Diagnostics .......................................................................................B-18
Datalogging ......................................................................................B-19
Calibration........................................................................................B-26
Keys/Display.....................................................................................B-33
Measurement Configuration .............................................................B-35
Hardware Configuration...................................................................B-38
Communications Configuration .......................................................B-40
I/O Configuration ............................................................................B-48
Record Layout Definition .................................................................B-53
Format Specifier for ASCII Responses............................................B-54
Format Specifier for Binary Responses ...........................................B-54
Format Specifier for Erec Layout....................................................B-54
Text ............................................................................................B-55
Value String ................................................................................B-55
Value Source...............................................................................B-55
Alarm Information......................................................................B-55
Translation Table........................................................................B-56
Selection Table............................................................................B-56
Button Designator ......................................................................B-56
Examples.....................................................................................B-57
MODBUS Protocol ............................................................................................C-1
Serial Communication Parameters ......................................................C-1
TCP Communication Parameters .......................................................C-2
Application Data Unit Definition .......................................................C-2
Slave Address ...................................................................................C-2
MBAP Header .................................................................................C-2
Function Code.................................................................................C-3
Data.................................................................................................C-3
Error Check .....................................................................................C-3
Function Codes...................................................................................C-3
(0x01/0x02) Read Coils/Read Inputs ...............................................C-3
(0x03/0x04) Read Holding Registers/Read Input Registers..............C-5
Appendix A
Appendix B
Appendix C

Contents
xiv Model 48iInstruction Manual Thermo Fisher Scientific
(0x05) Force (Write) Single Coil..................................................... C-7
MODBUS Parameters Supported ...................................................... C-8
Reading a Write Coil .................................................................... C-12
Gesytec (Bayern-Hessen) Protocol ..............................................................D-1
Serial Communication Parameters ..................................................... D-1
TCP Communication Parameters ...................................................... D-2
Instrument Address ............................................................................ D-2
Abbreviations Used ............................................................................ D-2
Basic Command Structure ................................................................. D-2
Block Checksum Characters <BCC>.................................................. D-3
Gesytec Commands ........................................................................... D-3
Instrument Control Command (ST)............................................... D-3
Data Sampling/Data Query Command (DA).................................. D-4
Measurements reported in response to DA command ..................... D-7
Single Range Mode ...................................................................... D-7
Dual/Auto Range Mode............................................................... D-7
Operating and Error Status ............................................................. D-7
Appendix D