E-10 | Model 888 ATEX IECEx Tail Gas Analyzer
Detector Communications Failure [18]
The detector assembly (883048901) communicates to the sensor assembly,
(883047901). If this communication link is broken, concentration measurements
cannot be made. This is a Level 2 alarm.
User intervention is required. Make sure that all cables are fully inserted. The sen-
sor assembly may be defective.
High Flash Count Warning [19]
The Model 888 analyzer adjusts the number of flashes-per-second to achieve ad-
equate light intensity at the detector. If the optical system is fouled, the required
flash count will increase. If a flash rate is within 10 flashes of the maximum, a
Level 3 alarm occurs. This alerts the end user to a potentially more serious prob-
lem leading to a Low Light Alarm.
Refer to the Low Light Alarm for possible causes of this condition.
Low Flash Count Warning [20]
The calibration period requires a minimum number of flashes. The flash count
will be checked during a calibration. If the light intensity is too high or the target
ADC value (set by Parameter 207) is too low, then there is a problem. The soft-
ware will attempt to alter the target value to achieve the minimum flash count.
The alarm will clear itself if the flash count is adequate (during the next cal pe-
riod).
User Alarm (Relay 3 and 4) [21] [22]
This is a Level 4 alarm to log any programmable alarms.
Flange Temperature Warning [23]
There is a temperature sensor mounted to the pipe flange on the oven enclosure.
If the temperature of the flange drops below the alarm set point, there is a danger
that sulfur deposits will occur within the probe. If left unchecked, this may lead
to a blockage. This is a Level 3 alarm.
This alarm is cleared by raising the temperature of the flange. Check the insula-
tion around the external ball valve and make sure there is sufficient heat applied
to the ball valve.
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