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Base metal electrode 2Pb→2Pb
2
+
+4e
−
As a result, a current proportional to the concentration of oxygen in the air flows from the noble metal
electrode to the base metal electrode through an external circuit. Since the current generated is dependent on
temperature, a thermistor is used to compensate for the atmospheric temperature changes.
Figure 10
NOTE: The galvanic cell sensor gives an output according to the partial pressure of the oxygen in the air (the
oxygen concentration is usually 21vol%.) Therefore, when the atmospheric pressure changes, the partial
pressure of the oxygen will change, and when there is no change in the oxygen concentration (21vol%), this
may effect the output values from the sensor.
Chapter 14 – Glossary
Detects the gas concentration level, and converts it into an electric signal.
Target Gases for
detection
The target gases for which the gas concentration level is detected, and indications
or warnings are given.
The concentration range within which the level of target gases can be detected, and
indications or warnings given.
The time between when a level of gas concentration higher (or lower) than the
preset alarm values come into contact with the gas detector, and when the alarm
goes off.
Explosion-proof
constructions
Construction to ensure that electrical components do not become an ignition source
and do not ignite surrounding flammable air.
Inspections conducted to ensure that the instrument is able to continue carrying out
the functions demanded of it.
Part of this terminology list is quoted from gas detection monitor terminology definitions from the Industrial
Gas Detectors Monitor Association.
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