iTRANS 2
FIXED POINT SINGLE OR DUAL GAS MONITOR
WITH DUAL ANALOG OUTPUTS
USER MANUAL
Revision 7.0
8 Troubleshooting
8.1 Introduction
This chapter provides troubleshooting information for the gas monitor.
8.2 Diagnosing Common Problems
LED display does not light up. Input voltage is too low
Electronics module has failed
Check for presence of input voltage.
Output outside 4-20 mA range Unit in calibration mode
Electronics module has failed
Exit calibration mode.
Replace electronics module.
Output does not change when gas
concentration changes
Electronics module has failed Replace electronics module.
Cannot calibrate SPAN Sensor has failed
Electronics module has failed
Replace sensor and calibrate.
Replace electronics module and calibrate.
Reading drifts by 10 counts over a
short time period (in a stable
temperature environment)
Sensor has failed
Electronics module has failed
Replace sensor and calibrate.
Replace electronics module and calibrate.
In calibration, LED displays wrong
value.
Sensor has failed
Electronics module has failed
Replace sensor and calibrate.
Replace electronics module and calibrate.
Reed Switch does not work Electronics module has failed
Reed Switch is damaged
Replace electronics module and calibrate.
Replace the reed switch.
“P” appears on the display Open loop on a 4-20 mA channel Place a 100-Ohm load resistor from the mA output pin
to ground.
“U Or” appears on the display
4-20 mA signal goes into over
range for about 5 seconds before
settling at 1mA
Ensure the sensor is working properly via a second ary
gas detection source and the 4-20 mA is scaled
correctly.
Table 8-1 Common Problems
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