9 Troubleshooting
GD-D58 Series
- 42 -
<Abnormalities of Readings>
* Perform troubleshooting on it as well as the indicator/alarm unit. For details, see the operating manual of
the indicator/alarm unit.
Symptoms Causes
Actions
The reading rises (drops)
and it remains so.
Drifting of sensor
output
Perform the zero 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.
Environmental
changes
Perform the zero adjustment.
A gas alarm is triggered
despite of no gas leak and
no other abnormalities at
the detection point.
Presence of
interference gas
Disturbances by interference gases, such as solvents, cannot
be eliminated completely. For information on actions such as
removal of filter, please contact RIKEN KEIKI.
Disturbance by noise
Turn off and restart the detector head.
If such a symptom is observed frequently, take appropriate
measures to eliminate the noise.
Sudden change in the
environment
When the environment (temperature, etc.) changes suddenly,
the detector head cannot adjust to it and is affected by it. In
some cases, the detector head triggers an indication alarm.
Because the detector head cannot be used under sudden
and frequent environmental changes, you must take any
preventive actions to eliminate them.
Slow response
Sensor sensitivity
deterioration
Replace the sensor with a new one.
Span adjustment
impossible
Improper calibration
gas concentration
Use the proper calibration gas.
Sensor sensitivity
deterioration
Replace the sensor with a new one.
