9 Troubleshooting
SD-1DGH
- 50 -
<Abnormalities of Readings>
Symptoms Causes
Actions
Drifting of sensor
output
Perform the zero adjustment and the span
adjustment.
Presence of
interference gas
Disturbances by interference gases, such as solvents,
cannot be eliminated completely.
For information on actions, such as removal filter,
please contact RIKEN KEIKI.
Slow leak
A very small amount of the gas to be detected may be
leaking (slow leak). Because ignoring it may cause
dangers, take a remedial measure, i.e., taking actions
the same as those for the gas alarm.
The reading rises
(drops) and it remains
so.
Environmental
changes
Perform the zero adjustment and the span
adjustment.
Presence of
interference gas
Disturbances by interference gases, such as solvents,
cannot be eliminated completely.
For information on actions, such as removal filter,
please contact RIKEN KEIKI.
Disturbance by
noise
Turn off and restart the detector.
If such a symptom is observed frequently,
take appropriate measures to eliminate the noise.
A gas alarm is triggered
despite of no gas leak
and no other
abnormalities at the
detection point.
Sudden change in
the environment
When the environment (temperature, etc.) changes
suddenly, the detector cannot adjust to it and is
affected by it. In some cases, the detector triggers an
indication alarm.
Because the detector cannot be used under sudden
and frequent environmental changes, any preventive
actions to eliminate them should be taken by the user.
Clogged dust filter
Replace the dust filter.
Bended, clogged, or
leaked suction tube
or exhaust tube
Fix the defective parts.
Condensation is
formed inside the
suction tube.
Fix the defective parts.
Slow response
Deteriorated sensor
sensitivity
Replace the sensor with a new one.
Improper calibration
gas concentration
Use the proper calibration gas.
Span adjustment
impossible
Deteriorated sensor
sensitivity
Replace the sensor with a new one.
