RKI Instruments RM-5000 Series Indicator/Alarm Unit - Manual (Page 76)

9 Troubleshooting 8-3. Disposal of products
RM-5000 - 76 -
<Abnormalities of Readings>
Symptoms Causes Actions
Drifting of sensor output Perform the zero adjustment (fresh air adjustment). The reading rises (drops) and it
remains so.
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 (fresh air adjustment).
In particular, the galvanic cell type is affected by the air
pressure.
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 indicator/alarm unit.
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 indicator/alarm unit cannot adjust to it and is
affected by it. In some cases, the indicator/alarm unit triggers
an indication alarm.
Because the indicator/alarm unit 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 dust filter.
Bended or clogged 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 unit with a new one.
Span adjustment impossible Improper calibration gas
concentration Use the proper calibration gas.
Deteriorated sensor
sensitivity
Replace the sensor unit with a new one.