GLA531 Series LGR-ICOS™ Gas Analyzer
Operating Manual
3KXG165002R4201_2021_04
ABB PROPRIETARY INFORMATION 71
Table 19 Possible Failed Components Based on Functions
Function Impact Components
System start-up
(or computer boot-up)
• Analyzer does not start
• Analyzer crashed and shut down
• PC104 Computer Stack
• Hard Disk Drive
DC-to-DC Converter
Ethernet or USB
communications
• No direct access to computer
• No I/O access
• PC104 Computer Stack
• Ethernet cable or USB cable
Remote digital I/O access
• No connections to Modbus
• ioLogik E1240 Modbus unit
Ethernet cable installation
4-20 mA analog signal
transmissions
• No analog data transmissions
• 4-20 mA Isolator unit
• Signal cable installation
Temperature control of
analyzer
• Analyzer alarm or warning
• Measurement drift or error
• Condensation inside ICOS cell
• Heater controller
• Heater element
• Thermocouple (T/C)
• Solid state relay
Gas Temperature Reading
(on HMI Control Bar)
• Measurement drift or error
• Display wrong temperature
• ICOS TH-Amp heat sensor
assembly
Pressure control of analyzer
• Analyzer alarm or warning
• Measurement drift or error
• Abnormal analyzer spectrum
profile
• Exhaust pump
• Solid state relay
• 2-Port Solenoid Driver
• PWM pressure controller
• EPC valve
• Inlet solenoid valve
• ICOS Pressure Gauge
• ICOS Inlet Orifice
ICOS Gas filters
Light intensity detection
(low or zero detector voltage
on spectrum screen)
• Analyzer alarm
• ICOS function failure
• No measurement outputs
• Laser
• Laser driver board
• Photo detector
Mirror reflectivity
(decreased laser ring-down
time readings on HMI Control
Bar)
• Analyzer alarm or warning
• Decrease in ring-down time
• Measurement error
• Dirty astigmatic mirrors
Purge System
If the purge alarm triggers for X-purge systems, and power to the analyzer is shut off:
• Check that the enclosure door is completely closed and all of the locking clamps are engaged.
• Check that the purge-gas supply pressure is adequate and regulated to the specified purged-air
regulated pressure on the certification plate.
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