MSA PrimaX IR Manuel D'utilisation page 32

Maintenance
General Troubleshooting Guide
Indication
Unstable 4 mA signal after
power on and warm up
mA output current does not
change when gas is applied
Calibration cap span fails.
Calibration cap rapidly flashes all
icons during startup
Known gas concentration re-
sponse is incorrect
32
Action
Verify DC voltage supply is between
18 - 32 VDC. Total voltage, including any AC
components, must be less than 32 VDC.
If power supply is within 18-32 VDC, check for
noise on the input power line. Use of an exter-
nal filter may be required in this case.
Verify that gas flow path is unobstructed. Visu-
ally inspect the gas inlets and the regulator.
Verify that you are not in calibration mode or
any of the defined mA output levels shown in
chapter 4.1.
Verify that the device is not in Fixed Current
Mode [Commanded via HART].
Pull the cap off and evacuate gas from the cali-
bration cap. Retry th e calibration procedure and
verify the Zero calibration was successful. If
Zero calibration returns "" and the Span cali-
bration fails, verify adequate span gas and flow.
Verify that the Span gas is applied within the 30
second window.
Check the o-ring integrity to ensure a good seal
between the sensor and the calibration cap.
Check the cap for damage.
The calibration cap battery is nearing the end of
its useful life. The calibration cap will continue
to operate until the battery is consumed.
Calibrate. If calibration fails, remove power and
reapply.
Verify span gas flow rate and cylin der accuracy.
Verify environmental guard and/or flow cap are
not obstructed.
Verify line load is according to electrical instal-
lation chapter 3.2.
Verify ambient temperature range is appropri-
ate for the device rating.
PrimaX IR
MSA
US