Operating Instructions GM35
Probe Model
Troubleshooting
8009389/07-2006 © SICK MAIHAK GmbH • Germany · All rights reserved 81
9 Troubleshooting
This chapter explains how to detect, diagnose, and correct malfunctions on of the GM35
gas analyzer. The information provided here is primarily intended for personnel who are re-
sponsible for operating the measuring system, and maintenance technicians responsible for
correcting malfunctions.
9.1 Malfunction categories/possible effects
Malfunctions on of the GM35 are categorized according to their anticipated effects:
Damage on the measuring system itself
Depending on the conditions at the installation and the design of the measuring system, a
purge air failure could cause damage to the GM35. The necessary emergency and protec-
tion measures are described in Chapter 9.2.
9.2 Purge air failure
A failure of the purge air supply will require measures to be taken immediately or within a
short time (depending on the installation conditions) to protect the measuring system. A
purge air failure, however, rarely occurs in practice. You should, however, be prepared for
such an occurrence to prevent damage to the measuring system.
Indications of a potential purge air failure
• Error message on systems that are equipped with a differential pressure monitor
• Failure on the power supply to the purge air unit
• Increase in temperature on the housing of the GM35 SR unit
• Significant increase in the contamination on the optical boundary surfaces of the SR unit
• Hose for the purge air supply to the purge air attachment is loose or visibly damaged
Tools for troubleshooting
• Suitable protective equipment (protective clothing, gloves, and so on) that enable the
gas duct to be opened safely and the SR unit and reflector removed under the given in-
stallation conditions (hot/corrosive/hazardous/dust-laden measurement gases, over-
pressure in the duct).
• 2 wrenches for removing the SR unit and reflector. Other tools may be required for re-
storing the power supply.
• Flange cover for sealing the flange opening when the measuring system is removed
9.3 Integrated monitoring and diagnosis system
The GM35 is equipped with an integrated system that constantly monitors the operating
condition of the SR unit and evaluation unit. If deviations from normal operating conditions
occur, appropriate messages are generated and logged in the devices for subsequent eval-
uation.
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