5-4 | Model 888 ATEX IECEx Tail Gas Analyzer
Level 3 Alarms
Low Light Warning
The light level at the four detectors has dropped below ac-
ceptable levels. The alarm usually indicates that the optical
surfaces have been fouled and require cleaning.
Detector Temperature Alarm
The lter block (part of 883048901) is maintained at 40 °C to
increase the lifetime of the interference lters. This alarm is
set if the temperature is out of its limits.
Flange Temperature Alarm
The temperature at the input ange is below its lower limit.
This is a indicates that there is a cold spot at the ange that
may lead to a plugging condition.
High Flash Count Warning
The 888 varies the number of ashes for each detector to
ensure adequate light levels at each photodiode. A high ash
count usually indicates that optical surfaces need cleaning.
Low Flash Count Warning
The 888 requires a minimum number of ashes per measure-
ment to perform a span calibration. The alarm is set if any
ash count falls below 6.
Level 4 Alarms
Alarm Relay 3
Alarm Relay 4
A programmable alarm relay has exceeded its limits
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