Operating Precautions
This detector head is a gas detector that detects combustible gases in the air and triggers a gas alarm.
The gas detector is a safety unit, not an analyzer or densitometer which performs quantitative/qualitative
analysis/measurement for gases.
Please fully understand the following points before using it, so that it can be used properly.
1. This detector head may be interfered by gases and vapors other than the gas to be detected.
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 detector head can be ensured.
In facilities compliant with the High Pressure Gas Safety Act, an alarm setting below our standard
alarm setpoint may trigger a false alarm.
3. This is a safety unit, not a control unit.
The alarm contact output of the detector head must be used for an external alarm lamp/buzzer, while
the alarm 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. The gas sensing part of the gas sensor installed in this detector head is made of metal porous sintered
alloy permeated with an oxidation catalyst.
If silicon or sulfide compounds are accumulated on the surface of porous sintered alloy, the area of the
gas sensing part becomes smaller, which may results in serious deterioration of its sensitivity.
For safety reasons, do not use the detector head under the presence of silicon or sulfide compounds
even though their amount is very small.
5. For maintenance of the detector head, 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 gas
calibration are performed every six months in accordance with the regulations.
