Riken Keiki SD-1DRI, Operating Manual

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9 Troubleshooting 9 Troubleshooting
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<Abnormalities of Readings>
Symptoms Causes Actions
The reading rises
(drops) and it remains
so.
Drifting of sensor
output
Perform the zero adjustment.
Presence of
interference gas Interference gas test including solvents are identified,
and be treated properly.
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 (AIR adjustment).
A gas alarm is triggered
despite of no gas leak
and no other
abnormalities at the
detection point.
Presence of
interference gas Interference gas test including solvents are identified,
and be treated properly.
Disturbance by
noise
Turn off and restart the detector.
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 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
should be taken to eliminate them by the user.
Slow response
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.
Deteriorated sensor
sensitivity
Replace the sensor with a new one.
Sensitivity calibration
impossible
Improper calibration
gas concentration
Use the proper calibration gas.
Deteriorated sensor
sensitivity
Replace the sensor with a new one.
<Abnormalities of installation environment>
Symptom/Display FAULT Causes Actions
Out of operating
temperature
range
E-27
―
The environmental
temperature is out of
operating temperature
range
Operating temperature range
-20 to +60
℃
If environmental temperature is out of operating
temperature range, countermeasure for
adjusting environmental temperature is needed
to be considered.