SensAlarm
Flex
–
Universal Gas Detection System
P a g e
72 | 82
Sensidyne Document No. 360-0257-01 (Rev A)
9. APPENDIX C: TROUBLESHOOTING GUIDE
Symptom
Remedy
Unusual operation at installation of power
Display irregularities upon initial power
application.
Reset system by removing power, waiting 15 seconds and
reapplying power. Normal startup should be observed.
No Display
No power supplied to Monitor
Measure AC voltage at TB1 power distribution board.
Measure DC voltage at TB2 power distribution board.
Open fuse
Check fuses 1-4 on power distribution board.
Cannot derive 40 mV at check points, but display shows zero
Wiring at TB1 of the main board is defective.
Check and correct wiring.
Zero control out of electronics
module is defective.
Zero the Monitor. If unsuccessful replace electronics.
After “Zero OK”, display shows a slightly positive value instead of zero
Presence of target gas.
Normal operation.
After “Zero Failed” 2
nd
time, display shows a slightly positive value
instead of zero.
Presence of target gas
Normal operation.
A biased sensor (Ammonia or Hydrogen
Chloride) has not yet stabilized.
Biased sensors typically take longer to stabilize than non-
biased sensors, especially if the bias sensor has become
de-stabilized. A destabilized biased sensor may take up to
72 hours to re-stabilize.
Incorrect battery board used
for biased sensor.
Check to ensure proper battery bias board is used.
Sensor is damaged or defective.
Replace suspect sensor with a backup sensor known to be
good. Repeat start-up procedure. If display shows slightly
positive value, gas is present. If display shows zero,
suspect sensor is bad.
Screen shows that span calibration has failed.
Calibration gas concentration is incorrect.
Verify calibration gas concentration with a detector tube and
assure proper delivery of calibration gas to sensor
assembly.
Sensor is defective.
Replace sensor assembly.
Sensor Interface Assembly is defective.
Replace Sensor Interface Assembly.
Monitor
shows “Missing Sensor” on display.
Sensor assembly is loose or missing.
Make certain sensor assembly is properly installed. This can
be tested by removing and reinserting the sensor. Make
certain sensor head unit is properly connected to the power
supply board.
Summary of Contents for SENSALARM FLEX
Page 1: ...Document No 360 0257 01 Rev A ...
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