Riken Keiki GD-1DOX-AS, Operating Manual

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5 How to Operate 5-3. How to start the gas detector
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5-3. How to start the gas detector
Turn on the power switch of the indicator/alarm unit. Gas detection starts after the initial clear.
The following decrease may occur during the measurement of the oxygen concentration, but it is not a
failure. Please recognize it in advance.
1. Indicated values fluctuate in response to changes in the air pressure
The oxygen concentration in the atmosphere fluctuates in proportion to the atmospheric pressure.
Therefore, when a low air pressure such as typhoon passes, the instruction drops only slightly.
2. Oxygen sensors are affected by sudden temperature changes
If a rapid temperature change occurs in a short period of time, the indicated value may change.
The sensor performs temperature compensation, but the compensation cannot follow a short-time
temperature change, and the instructions may vary.
3. Effects of other gases
If the product is used in an atmosphere with a CO
2
concentration of 15% or more or an organic solvent,
the oxygen sensor may be adversely affected and the instructions may become unstable.
4. Instruction gradually decreases when used for a long time (six month – one year)
If the sensor is used for a long period of time, the output of the sensor gradually drops, and the
indication drops. In such a case, make sure that the surroundings of the detector are fresh air release,
and then adjust them.