10. Product Specifications
10-3. Detection principle
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Special precautions for this principle
1. The gas detector may be interfered by gases other than the gas to be detected, solvents, vapors, etc.
Please note that the alarm may be triggered by interference. In addition, it may be fluctuated by
environmental (temperature, humidity, etc.) changes in the installation site.
2. The alarm must be set within a range where the performance of the gas detector can be ensured.
In facilities compliant with the High Pressure Gas Safety Act, an alarm setting below our standard alarm
setpoint (threshold limit value) may trigger a false alarm.
3. This is a safety unit, not a control unit.
The alarm contact output of the gas detector must be used for an external alarm lamp, while the analog
signal output must be used for an indicator or external recorder. If these outputs are used to control other
units, we shall not be responsible for any malfunctions.
4. Because the contact point of the gas detector sensor is made of porous polymeric membrane, the water
repellency of the membrane is deteriorated by solvents, thus causing an electrolyte leak from its inside.
Do not use solvents near the gas detector. If a solvent is used for unavoidable reasons, attach the
recommended filter to the areas such as inlet of the gas detector while using the solvent and for one
hour after that.
5. For maintenance of the gas detector, it must go through a regular maintenance, including replacement
and adjustment of the regular replacement parts as specified in the operating manual. In addition,
because this is a safety unit, it is recommended that a regular maintenance and a calibration are
performed every six months in accordance with the regulations.
