SICK GM901 User manual

MMM
I
MMMOPERATING INSTRUCTIONS
OPERATING INSTRUCTIONS
GM901
Carbon Monoxide Gas Analyzer,
Cross-Duct Version
Title Page

28008250/1F7Y/V4-0/2022-06 | SICKOPERATING INSTRUCTIONS | GM901
Subject to change without notice
Described product
Product name: GM901
Variant: Cross Duct version
Manufacturer
SICK AG
Erwin-Sick-Str. 1
D-79183 Waldkirch
Germany
Legal information
This work is protected by copyright. All rights derived from the copyright shall be reserved
for SICK AG. Reproduction of this document or parts of this document is only permissible
within the limits of the legal determination of Copyright Law.
Any modification, shortening or translation of this document is prohibited without the
express written permission of SICK AG.
The trademarks stated in this document are the property of their respective owner.
© SICK AG. All rights reserved.
Original document
This document is an original document of SICK AG.

CONTENTS
3
8008250/1F7Y/V4-0/2022-06 | SICK OPERATING INSTRUCTIONS | GM901
Subject to change without notice
1 About this document................................................................................. 7
1.1 Function of this document.............................................................................. 7
1.2 Scope of application ....................................................................................... 7
1.3 Target groups ..................................................................................................7
1.4 Further information .........................................................................................7
1.5 Symbols and document conventions .............................................................8
1.5.1 Warning symbols............................................................................. 8
1.5.2 Warning levels and signal words....................................................8
1.5.3 Information symbols ....................................................................... 8
1.6 Data integrity................................................................................................... 8
2 For your safety..........................................................................................10
2.1 Intended use .................................................................................................10
2.2 Responsibility of user....................................................................................10
2.3 Troubleshooting precautions........................................................................11
2.4 Basic measures to prevent property damage and injury to persons..........11
2.5 Environment-friendly behavior......................................................................11
2.6 Responsibility for system safety...................................................................11
2.7 Protection against hazards through gases ..................................................12
2.7.1 Protective measures against escaping gases .............................12
2.7.2 Noxious gases in device/module.................................................12
2.7.3 Hot gases in ambient conditions with overpressure...................12
2.7.4 Behavior after purge air failure ....................................................12
2.8 Electrical safety .............................................................................................13
2.8.1 Protection against hazards through electrical equipment..........13
2.8.2 Electrical safety through circuit breakers properly installed ......13
2.8.3 Electrical safety through lines with correct rating.......................13
2.8.4 Grounding the devices .................................................................13
3 Product description .................................................................................14
3.1 Product identification....................................................................................14
3.2 Product features ...........................................................................................14
3.2.1 Cross-sensitivities .........................................................................14
3.3 Device variants..............................................................................................17
3.4 Layout ............................................................................................................18
3.5 Standard scope of delivery ...........................................................................19
3.5.1 Control unit ...................................................................................19
3.5.2 PROFIBUS interface (if installed) .................................................19
3.6 Optional accessories.....................................................................................20
4 Transport and storage.............................................................................21
4.1 Storage ..........................................................................................................21
Contents
Contents

CONTENTS
48008250/1F7Y/V4-0/2022-06 | SICKOPERATING INSTRUCTIONS | GM901
Subject to change without notice
5 Mounting ................................................................................................... 22
5.1 Safety ............................................................................................................ 22
5.1.1 Information on lifting and carrying .............................................. 22
5.1.2 Information on assembly (wall fitting) ......................................... 22
5.2 Preparing the sampling point....................................................................... 22
5.3 Check scope of delivery................................................................................ 22
5.4 Fitting the flange with pipe........................................................................... 23
5.4.1 Installing the standard flange ..................................................... 24
5.4.2 Measuring distance definition ..................................................... 25
5.4.3 Assembly variant for brick stacks................................................ 26
5.4.4 Assembly variant for thin-walled ducts ....................................... 26
5.5 Installing the purge air unit ......................................................................... 27
5.6 Installing the GM901 CO measuring device................................................ 27
5.6.1 Aligning the optical axis ............................................................... 28
5.6.2 Installing the sender and receiver............................................... 29
5.6.3 Installing the weather protection hood for the GM901.............. 30
5.7 Installing the control unit ............................................................................. 31
6 Electrical installation............................................................................... 32
6.1 Project planning............................................................................................ 32
6.2 Electrical wiring for the standard version.................................................... 33
6.3 Electrical wiring with connection unit .......................................................... 34
6.4 Electrical connection of the purge air motor............................................... 34
6.5 Electrical wiring: Control unit – standard .................................................... 35
6.6 Electrical wiring: Control unit – PROFIBUS .................................................. 36
6.7 Electrical connections of the evaluation unit .............................................. 37
7 Commissioning ........................................................................................ 38
7.1 Requirements for commissioning ................................................................ 38
7.2 Calibration..................................................................................................... 39
7.2.1 Prerequisites for zero adjust........................................................ 39
7.2.2 Calibrating the GM901 Standard ................................................ 39
7.2.3 Calibrating the GM901 with extended calibration...................... 40
7.2.4 Zero adjust.................................................................................... 41
7.2.5 SPAN test (optional) ..................................................................... 42
7.3 Fitting the measuring device on the duct .................................................... 43
7.4 Preset parameter values ............................................................................ 44
8 Operation .................................................................................................. 45
8.1 Operating and display elements .................................................................. 45
8.1.1 Control unit operating panel ........................................................ 45
8.1.2 Display .......................................................................................... 46
8.1.3 Status LEDs .................................................................................. 46

CONTENTS
5
8008250/1F7Y/V4-0/2022-06 | SICK OPERATING INSTRUCTIONS | GM901
Subject to change without notice
9 Menus ........................................................................................................47
9.1 Measuring mode ...........................................................................................47
9.2 Diagnosis .......................................................................................................48
9.2.1 Viewing malfunction messages....................................................48
9.2.2 Viewing warning messages ..........................................................49
9.2.3 Viewing sensor values ..................................................................50
9.3 Parameters ....................................................................................................51
9.3.1 Changing the physical unit ...........................................................52
9.3.2 Setting the humidity correction....................................................53
9.3.3 Changing the response time ........................................................54
9.3.4 Changing the measuring range ....................................................55
9.3.5 Changing the limit value...............................................................56
9.3.6 Changing the flange - flange measuring distance and the
active measuring distance ...........................................................57
9.3.7 Temperature .................................................................................58
9.3.8 Setting the humidity content in sample gas ................................62
9.3.9 Setting the sample gas pressure .................................................63
9.3.10 Changing the Live Zero value of the analog output
(Analog Out) ..................................................................................64
9.3.11 Changing the calibration values ..................................................65
9.3.12 Median Filter .................................................................................66
9.3.13 Device characteristic data (Device) .............................................66
9.3.14 Service...........................................................................................68
9.4 Calibration .....................................................................................................68
9.4.1 Performing zero adjust .................................................................69
9.4.2 SPAN Test......................................................................................70
9.5 Maintenance .................................................................................................71
9.5.1 Reset System ................................................................................71
9.5.2 Maintenance mode.......................................................................72
9.5.3 Test analog output........................................................................73
9.5.4 Test relay.......................................................................................74
9.5.5 Reset Parameter...........................................................................75
9.6 Connecting the PROFIBUS during commissioning (if installed) .................75
10 Maintenance.............................................................................................76
10.1 General ..........................................................................................................76
10.2 Maintenance interval of individual components of GM901 CO systems ...76
11 Troubleshooting .......................................................................................77
11.1 Warnings........................................................................................................77
11.2 Malfunctions..................................................................................................78
11.3 Further tips on troubleshooting....................................................................79
11.3.1 Troubleshooting on the sender ....................................................79
11.3.2 Troubleshooting on receiver.........................................................80
11.3.3 Troubleshooting on the control unit.............................................81

CONTENTS
68008250/1F7Y/V4-0/2022-06 | SICKOPERATING INSTRUCTIONS | GM901
Subject to change without notice
12 Shutting down .......................................................................................... 83
12.1 Disassembling the sender and receiver ...................................................... 83
12.2 Deinstallation................................................................................................ 83
12.3 Disposal ........................................................................................................ 83
13 Technical data.......................................................................................... 84
13.1 System GM901-05 ....................................................................................... 84
13.2 Sender unit .................................................................................................. 84
13.3 Receiver unit ................................................................................................ 84
13.4 Control unit AWE, standard version (Part No.: 2020428, 2021433) ........ 85
13.5 Control unit AWE with extended connectivity (Part No.: 2027607,
2084045) ..................................................................................................... 86
13.6 Connection unit ............................................................................................ 86
13.7 Dimension drawing, sender/receiver unit ................................................... 87
13.8 Dimensional drawing, control unit ............................................................... 88
13.9 Dimension drawing, connection unit ........................................................... 89
13.10 Dimension drawing, flange with tube, DN125 ............................................ 89
13.11 Dimension drawing, weather protection hood, sender/receiver unit......... 90
14 Order data................................................................................................. 91
14.1 Spare parts .................................................................................................. 91
14.2 Options, accessories .................................................................................... 91
15 Conformities ............................................................................................. 92

7
8008250/1F7Y/V4-0/2022-06 | SICK OPERATING INSTRUCTIONS | GM901
Subject to change without notice
ABOUT THIS DOCUMENT 1
1Aboutthisdocument
1.1 Function of this document
These Operating Instructions describe
– System components
– Commissioning
–Operation
– Maintenance work required for safe operation
–Troubleshooting
1.2 Scope of application
These Operating Instructions apply exclusively to the measuring device described in the
product identification.
They do not apply for any other measuring devices from SICK.
The standards specified in Operating Instructions must be observed in their currently valid
version.
1.3 Target groups
This Manual is intended for persons installing, operating and maintaining the device.
Operation
The device should be operated exclusively by qualified persons who, based on their
technical training and knowledge as well as knowledge of the relevant regulations, can
assess the tasks given and recognize the hazards involved.
Installation and maintenance
Installation and maintenance may only be carried out by specialists trained for this purpose
and familiar with the installation conditions.
Please observe the information at the beginning of the respective Sections.
1.4 Further information
– Purge air unit Operating Instructions
– Final inspection protocol
NOTE:
Observe all documents provided.

88008250/1F7Y/V4-0/2022-06 | SICKOPERATING INSTRUCTIONS | GM901
Subject to change without notice
1ABOUT THIS DOCUMENT
1.5 Symbols and document conventions
1.5.1 Warning symbols
1.5.2 Warning levels and signal words
DANGER:
Risk or hazardous situation which will result in severe personal injury or death.
WARNING:
Risk or hazardous situation which could result in severe personal injury or death.
CAUTION:
Hazard or unsafe practice which could result in less severe or minor injuries.
NOTICE:
Hazard which could result in property damage.
Note:
Tips
1.5.3 Information symbols
1.6 Data integrity
SICK AG uses standardized data interfaces, such as standard IP technology, in its products.
The focus here is on the availability of the products and their properties.
SICK AG always assumes the integrity and confidentiality of data and rights affected in
connection with the use of the products are ensured by the customer.
Symbol Significance
Hazard (general)
Hazard through electrical voltage
Hazard through oxidizing substances
Hazard through toxic substances
Hazard through noxious substances
Hazard through high temperature or hot surfaces
Hazard for the environment/nature/organic life
Symbol Significance
Important technical information for this product
Important information on electrical or electronic functions

9
8008250/1F7Y/V4-0/2022-06 | SICK OPERATING INSTRUCTIONS | GM901
Subject to change without notice
ABOUT THIS DOCUMENT 1
In all cases, the customer is responsible for the implementation of safety measures
suitable for the respective situation, e.g., network separation, firewalls, virus protection and
patch management.

10 8008250/1F7Y/V4-0/2022-06 | SICKOPERATING INSTRUCTIONS | GM901
Subject to change without notice
2FOR YOUR SAFETY
2Foryoursafety
2.1 Intended use
The GM901-02 serves exclusively to monitor CO concentrations of gases in industrial
plants.
The device measures continuously directly in the gas duct (in-situ).
2.2 Responsibility of user
Designated users
see “Target groups”, page 7
Correct project planning
– Basis of this Manual is the delivery of the device according to the preceding project
planning (e.g., based on the SICK application questionnaire) and the relevant delivery
state of the device (see delivered system documentation).
▸If you are not sure whether the device corresponds to the state defined during project
planning or to the delivered system documentation: Please contact SICK Customer
Service.
Correct use
▸Use the device only as described in “Intended use”.
▸The manufacturer bears no responsibility for any other use.
▸Carry out the specified maintenance work.
▸Do not attempt any work on or repairs to the device unless described in this Manual.
Do not remove, add or change any components in or on the device unless such changes
are officially allowed and specified by the manufacturer.
Use only original spare parts and expendable parts from SICK.
Failure to observe these precautions could result in:
– Voiding the manufacturer's warranty.
– The device becoming dangerous.
Special local requirements
In addition to the information in these Operating Instructions, follow all local laws, technical
rules and company-internal operating directives applicable wherever the device is installed.
Read the Operating Instructions
▸Read and observe these Operating Instructions.
▸Observe all safety instructions.
▸If anything is not clear: Please contact SICK Customer Service.
Retain documents
These Operating Instructions must be
– Available for reference.
– Passed on to new owners.

11
8008250/1F7Y/V4-0/2022-06 | SICK OPERATING INSTRUCTIONS | GM901
Subject to change without notice
FOR YOUR SAFETY 2
2.3 Troubleshooting precautions
The operator must ensure that:
●Maintenance personnel can be alerted immediately and at any time.
●Maintenance personnel are trained to be able to respond to malfunctions on the GM901
and correctly clear the operational malfunction involved.
●Suitable protective equipment, tools and auxiliary means are available at all times.
●Malfunctions are analyzed by qualified personnel, faults corrected, and operation
optimized to prevent similar malfunctions in the future.
2.4 Basic measures to prevent property damage and injury to persons
Incorrect use or handling of the GM901 CO measuring device can cause personal injury or
material damage.
▸Therefore, in order to prevent damage, the relevant safety information and valid safety
regulations must be observed.
If the GM901 is used as a sensor in combination with a regulating and control system, the
operator must ensure that a failure or malfunction on the GM901 cannot lead to unallowed
hazardous operating states or damage.
2.5 Environment-friendly behavior
The GM901 has been designed in accordance with ecological criteria. The assemblies can
be easily separated, sorted and recycled. All materials used in the GM901 are groundwater-
neutral.
2.6 Responsibility for system safety
NOTICE: Responsibility for system safety
The person setting the system up is responsible for the safety of the system in which the
device is integrated.

12 8008250/1F7Y/V4-0/2022-06 | SICKOPERATING INSTRUCTIONS | GM901
Subject to change without notice
2FOR YOUR SAFETY
2.7 Protection against hazards through gases
2.7.1 Protective measures against escaping gases
▸Wear protective clothing and a protective mask in the case of hot and/or aggressive
measuring gases or high dust loads.
▸Never open the enclosure or switch off the purge air feed without taking appropriate
protective measures when the duct is pressurized.
2.7.2 Noxious gases in device/module
2.7.3 Hot gases in ambient conditions with overpressure
●Purge air unit (SLV4)
2.7.4 Behavior after purge air failure
Certain configurations of the GM901 measuring system demand immediate or short term
measures to protect the measuring system should the purge air supply fail.
WARNING: Health risk through contact with toxic gases
The modules and devices contain enclosed potentially dangerous gases that can escape
due to a defect or leak. See Table “Maximum gas amounts in SICK devices” for these
gases.
Should a leakage occur, the concentrations inside the closed device could rise to a
certain concentration. These concentrations are also shown in this Table.
▸Check the condition of the seals on the device/module regularly.
▸Only open the device when good ventilation is available, especially when a leak of
one of the device components is suspected.
Table 1: Maximum gas amounts in SICK devices
Equipment/
module(s)
Gases Max. total
amount (ml)
Max. concentration inside the device
when leaks occur (defect)
GM901 CO 10 ml 350 ppm
WARNING: Risk of fire through hot gas escaping in installations with
overpressure conditions
On installations with overpressure, the purge air hose can be severely damaged by
escaping hot gas and can catch fire depending on the temperature.
On plants with overpressure and gas temperatures over 200 °C at the same time:
▸Ensure reverse flow is prevented by fitting a (trip) flap or a valve.
▸Regularly check the functionality of the reverse flow safeguard.

13
8008250/1F7Y/V4-0/2022-06 | SICK OPERATING INSTRUCTIONS | GM901
Subject to change without notice
FOR YOUR SAFETY 2
2.8 Electrical safety
2.8.1 Protection against hazards through electrical equipment
GM901 system components include electrical equipment designed for use in industrial
high-voltage plants where the relevant standards and regulations must be observed.
▸Disconnect power lines before working on power connections or live parts.
2.8.2 Electrical safety through circuit breakers properly installed
2.8.3 Electrical safety through lines with correct rating
2.8.4 Grounding the devices
WARNING: Endangerment of electrical safety during installation and
maintenance work when the power supply is not switched off
An electrical accident can occur during installation and maintenance work when the
power supply to the device or lines is not switched off using a power isolating switch/
circuit breaker.
▸Before starting the work on the device, ensure the power supply can be switched off
using a power isolating switch/circuit breaker in accordance with DIN EN 61010.
▸Make sure the power isolating switch is easily accessible.
▸An additional disconnecting device is mandatory when the power isolating switch
cannot be accessed or only with difficulty after installation of the device connection.
▸After completion of the work or for test purposes, the power supply may only be
activated again by authorized personnel complying with the safety regulations.
WARNING: Endangerment of electrical safety through power cable with
incorrect rating
Electrical accidents can occur when the specifications for replacement of a removable
power cable have not been adequately observed.
▸Always observe the exact specifications in the Operating Instructions (Technical Data
Section) when replacing a removable power line.
NOTICE: Device damage through incorrect or missing grounding
During installation and maintenance work, it must be ensured that the protective
grounding to the devices and/or lines involved is effective in accordance with
EN 61010-1.

14 8008250/1F7Y/V4-0/2022-06 | SICKOPERATING INSTRUCTIONS | GM901
Subject to change without notice
3PRODUCT DESCRIPTION
3 Product description
3.1 Product identification
3.2 Product features
The in-situ gas analyzer GM901 serves for continuous measurement of gas concentrations
in industrial plants.
●The GM901-02 is an in-situ measuring system which means measuring is done directly
in the gas carrying duct.
●Measuring components: CO and reference value temperature.
●Measuring principle: Infrared spectroscopic gas filter correlation.
3.2.1 Cross-sensitivities
Accurate temperature input is a critical factor that may be required to maintain desired
measurement accuracies. The temperature of an external RTD temperature sensor should
be connected to the analog input of the control unit.
The influence of temperature can be assessed in the following Table.
The humidity in the process affects measurement accuracy. GM901 does not measure
humidity, but a static humidity default value can be set.
The influence of the humidity on measurement accuracy depends on the process
temperature, the absolute process humidity and the humidity input error. The effect can be
assessed in the following Tables..
Product name GM901
Device version Cross-Duct
Manufacturer SICK AG
Erwin-Sick-Str. 1 · D-79183 Waldkirch · Germany
Type plates ●Sender unit: On the side
●Receiver unit: On the side
●Control unit: At the rear
Process temperature Absolute temperature
error
Relative temperature
error
Additional relative %
measurement error
100 °C 5 °C 5% 3%
200 °C 10 °C 5% 4.8%
300 °C 15 °C 5% 6%
400 °C 20 °C 5% 6.8%
Table 2: Actual process moisture at 0 vol. % H2O
Default value[1]
entered
(vol. % H2O)
Absolute difference to
input value
(vol. % H2O)
Process temperature
(°C)
Additional relative % CO
measurement error[2]
5 5 100 -2.5
5 5 200 -6.1
5 5 300 -7.6
5 5 400 -13.9
[1] See Section 9.4.8
[2] Based on 500 ppm CO, the uncertainty is lower for higher concentrations

15
8008250/1F7Y/V4-0/2022-06 | SICK OPERATING INSTRUCTIONS | GM901
Subject to change without notice
PRODUCT DESCRIPTION 3
Table 3: Actual process moisture at 10 vol. % H2O
Default value
entered[1]
(vol. % H2O)
Absolute difference to
input value
(vol. % H2O)
Process temperature
(°C)
Additional relative % CO
measurement error[2]
0 -10 100 3.8
0 -10 200 9.3
0 -10 300 14.2
0 -10 400 22.2
5 -5 100 1.2
5 -5 200 2.9
5 -5 300 4.3
5 -5 400 6.8
15 5 100 -0.9
15 5 200 -2.2
15 5 300 -3.3
15 5 400 -5.2
20 10 100 -1.7
20 10 200 -4.1
20 10 300 -6.2
20 10 400 -9.6
[1] See Section 9.4.8
[2] Based on 500 ppm CO, the uncertainty is lower for higher concentrations
Table 4: Actual process moisture at 20 vol. % H2O
Default value
entered[1]
(vol. % H2O)
Absolute difference to
input value
(vol. % H2O)
Process temperature
(°C)
Additional relative % CO
measurement error[2]
10 -10 100 1.8
10 -10 200 4.2
10 -10 300 7
10 -10 400 10
15 -5 100 0.8
15 -5 200 1.9
15 -5 300 3.2
15 -5 400 4.5
25 5 100 -0.7
25 5 200 -1.7
25 5 300 -2.8
25 5 400 -4
30 10 100 -1.4
30 10 200 -3.3
30 10 300 -5.3
30 10 400 -7.6
[1] See Section 9.4.8
[2] Based on 500 ppm CO, the uncertainty is lower for higher concentrations

16 8008250/1F7Y/V4-0/2022-06 | SICKOPERATING INSTRUCTIONS | GM901
Subject to change without notice
3PRODUCT DESCRIPTION
The presence of CO2 in the process gas has an effect on CO measurement at high
temperatures. The more the temperature increases at constant CO2 concentration, the
higher the relative CO measurement error becomes. Consider the influence in the following
Table.
Table 5: Actual process moisture at 30 vol. % H2O
Default value
entered[1]
(vol. % H2O)
Absolute difference to
input value
(vol. % H2O)
Process temperature
(°C)
Additional relative % CO
measurement error[2]
20 -10 100 1.4
20 -10 200 3.3
20 -10 300 5.9
20 -10 400 7.8
25 -5 100 0.7
25 -5 200 1.6
25 -5 300 2.8
25 -5 400 3.7
35 5 100 -0.6
35 5 200 -1.5
35 5 300 -2.6
35 5 400 -3.4
40 10 100 -1.2
40 10 200 -2.8
40 10 300 -4.9
40 10 400 -6.5
[1] See Section 9.4.8
[2] Based on 500 ppm CO, the uncertainty is lower for higher concentrations
Max. CO2 concentration for 1 m Max. temperature Relative CO measurement error
10 vol. % 370 °C 2%
400 °C 3%
410 °C 4%
15 vol. % 390 °C 2%
380 °C 3%
360 °C 4%
20 vol. % 340 °C 2%
360 °C 3%
380 °C 4%
25 vol. % 370 °C 2%
350 °C 3%
330 °C 4%

17
8008250/1F7Y/V4-0/2022-06 | SICK OPERATING INSTRUCTIONS | GM901
Subject to change without notice
PRODUCT DESCRIPTION 3
3.3 Device variants
The following device variants are available depending on the measuring task and the
application.
GM901 Standard GM901 Extended calibration
Type code GM901-05-xxxx1 or xxxx3 GM901-05-xxxx2 or xxxx4
Temperature range Applications up to 250 °C Applications up to 430 °C

18 8008250/1F7Y/V4-0/2022-06 | SICKOPERATING INSTRUCTIONS | GM901
Subject to change without notice
3PRODUCT DESCRIPTION
3.4 Layout
Fig. 1: Device component overview
.4 
6WLYH[PVU
:LY]PJL
>HYUPUN
4HSM\UJ[PVU
Purge air fixture
Control unit
SenderReceiver
Connection unit
(optional)
Purge air unit
(optional)
Temperature
sensor (optional)
Cable 15 m (CAN bus)
Cable 2 m (CAN bus)
PROFIBUS (if installed)
1 analog input
1 analog output
Power supply: 115/230 V AC
Cable max. 1000 m (CAN bus)

19
8008250/1F7Y/V4-0/2022-06 | SICK OPERATING INSTRUCTIONS | GM901
Subject to change without notice
PRODUCT DESCRIPTION 3
3.5 Standard scope of delivery
The basic version of the GM901 comprises
●Sender
●Receiver
●Control unit with connecting cable (2 m)
●Sender-receiver connection cable (15 m)
3.5.1 Control unit
The control unit serves in the measuring system as user interface and prepares and
outputs the measured values and performs control and monitoring functions.
The control unit can be positioned close to the sender; it can also be located up to about
1000 meters from the sampling point, e.g., installed in the switch center or monitoring
center of the industrial plant.
Functions:
●Output of measured values, computed data and operating states
●Communication with the peripheral equipment
●Output of error messages and other status signals
●Access during service (diagnosis)
3.5.2 PROFIBUS interface (if installed)
PROFIBUS connects the process control level (e.g., central computer, host, control room) to
the measuring device. Measured values, status states and error messages are queried
cyclically via the PROFIBUS. The GM901 supports PROFIBUS-DP-V1 with transfer rates
from 9.6 to 187 kBit/s. A device master file (GSD) is available for the evaluation unit to
define the interface. This contains specifications on device manufacturer, identification
number, transfer rates available, etc. This GSD (Profile GSD) of the device can be easily
used during project planning for the PROFIBUS.
A unique 7 bit device address (1-127) serves to identify PROFIBUS participants and can be
entered when setting control unit parameters. Addresses 126 and 127 are reserved and
must not be used.
Measured values provided
Measured values provided by the GM901 are defined in the device master file (GSD) as
input channels for the process control level (AI). The following Table shows the measured
variables with the respective assigned units of measure:
NOTE:
A terminator (terminating resistor) must be plugged to the final device.
Measured variable CO
CO ppm
CO mg/m3 (s.c.)
CO mg/m3 (a.c.)

20 8008250/1F7Y/V4-0/2022-06 | SICKOPERATING INSTRUCTIONS | GM901
Subject to change without notice
3PRODUCT DESCRIPTION
3.6 Optional accessories
●Connection unit for distances longer than 17 m up to 1000 m
●Purge air unit to protect the optical interfaces from sender and receiver
●Flanges
●Optical adjustment device
●CO test cells with holder (SPAN test)
●Adjustment bracket to create a zero path
●Dummy flange
●Temperature sensor PT 100
●Weather protection hood