GD-70D - 133 -
Detection principle
<Electrochemical Type>
The electric potential between the working
electrode and reference electrode is kept at a
certain level by a potentiostat circuit.
The gas to be detected is electrolyzed directly at
the working electrode. Because the current
generated is proportional to the gas
concentration, the gas concentration can be
determined by measuring the current between
the working electrode and the opposite
electrode.
Special precautions for this principle
1. The detector is interfered by gases other than the gas to be detected, solvents, vapors, etc.
Please note that an alarm can be triggered by interference. In addition, the reading may be affected 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 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 device, not a control device.
The alarm contact output of the detector 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 devices, 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.
Do not use solvents near the detector. If you must use a solvent for unavoidable reasons, attach the
recommended filter to the inlet of the gas detector while using the solvent and for one hour after that.
5. It is recommended that a regular maintenance and gas calibration are performed for every six months
in accordance with the regulations.
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