BA02191C SS2100 H
2
S TDLAS Gas Analyzer
Endress+Hauser B-23
Table B-1 Potential instrument problems and their solutions (Continued)
Symptom Response
Current loop is stuck at 4 mA or 20 mA Check display for error message. If
alarm has been triggered, reset the
alarm. Refer to the Description of
Device Parameters for information on
alarms.
On the current loop board, check the
voltage between the end of resistor R1
closest to the jumper and ground. If
the concentration reading is high, the
voltage should be near 1 VDC. If the
concentration reading is low, the
voltage should be near 4.7 VDC. If not,
the problem is probably on the main
electronics board. Return to the factory
for service. Refer to “Service Repair
Order” on page B-25.
Reading seems to always be high by a
fixed amount
Capture diagnostic data and send the
file to Endress+Hauser (see “To read
diagnostic data with HyperTermi-
nal” in the Description of Device
Parameters for this analyzer).
Check connections on display
communication and power cables.
Strange characters appear on front panel
display
Check connections on display
communication cable.
Pressing keys on front panel do not have
specified effect
Check connections on keypad cable.
Reading seems to always be high by a
fixed percentage
Capture diagnostic data and send the
file to Endress+Hauser (see “To read
diagnostic data with HyperTermi-
nal” in the Description of Device
Parameters for this analyzer).
Capture diagnostic data and send the
file to Endress+Hauser (see “To read
diagnostic data with HyperTermi-
nal” in the Description of Device
Parameters for this analyzer).
Check that Peak Tracking is enabled
(see “To change parameters in
Mode 2” in the Description of Device
Parameters for this analyzer).
Reading is erratic or seems incorrect Check for contamination in the sample
system, especially if the readings are
much higher than expected.
Gas concentration is equal to zero.
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