9 Troubleshooting
8-3. Disposal of products
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<Abnormalities of Readings>
Symptoms Causes
Actions
The reading rises (drops) and
it remains so.
Drifting of sensor
output
Perform 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 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 filter, please contact RIKEN
KEIKI.
Disturbance by noise
Turn off and restart the alarm system.
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 alarm system cannot adjust to it and is
affected by it. In some cases, the alarm system triggers
an indication alarm.
Because the alarm system cannot be used under sudden
and frequent environmental changes, you must take any
preventive actions to eliminate them.
Slow response
Clogged
dust filter
Replace the suction type detector head or dust filter of
the calibration gas supply pump.
Bended or clogged
suction tube or
exhaust tube
Fix the detective part (suction type detector head or
calibration gas supply pump).
Condensation is
formed inside the
suction tube.
Fix the detective part (suction type detector head or
calibration gas supply pump).
Deteriorated sensor
sensitivity
Replace the sensor with a new one.
Span adjustment impossible
Improper calibration
gas
concentration
Use the proper calibration gas.
Deteriorated sensor
sensitivity
Replace the sensor with a new one.
NOTE
Fuses rated at 250 V/5 A T can be used for the alarm system.
