BA02191C SS2100 H
2
S TDLAS Gas Analyzer
Endress+Hauser B-21
Table B-1 Potential instrument problems and their solutions (Continued)
Symptom Response
Laser Power Low Alrm fault
(Continued)
Refer to the Description of Device
Parameters for this analyzer to capture
diagnostic data and send the file to
Endress+Hauser Service. Refer to
“Service Repair Order” on page
B-25.
Possible alignment problem. Contact a
technical services representative for
service information. See “Service” on
page B-25.
Possible mirror contamination issue.
Refer to “Service” on page B-25 for
service information. If advised to do so,
clean the mirrors by following the
instructions under “To clean the mir-
rors” on page B-4.
Temp Low Alarm or Temp High Alarm
fault
Check that the actual temperature in
the measurement cell is within specifi-
cation (Table A–1 on page A–1). For
systems with a heated enclosure, check
that the temperature in the measure-
ment cell is within +/-5 C of the speci-
fied enclosure temperature.
If the temperature reading is incorrect,
check that the pressure/temperature
cable on the bottom of the electronics
enclosure is tight. Check the connector
on the cell temperature sensor. Check
the temperature connector on the
backplane board.
(NOTE: A temperature reading greater
than 150 °C indicates a short circuit on
the temperature sensor leads; a
reading of less than –40 °C indicates
an open circuit).
Pressure Low Alarm or Pressure High
Alarm fault
Check that the actual pressure in the
measurement cell is within specification
(Table A–1 on page A–1).
If the pressure reading is incorrect,
check that the pressure/temperature
cable on the bottom of the electronics
enclosure is tight. Check the connector
on the pressure sensor. Check the
pressure connector on the backplane
board.
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