Operating manual GPD 3000
Gas sensor
The sensor head contains a sensitive gas sensor, which reacts to
almost all combustible gases. Calibration of the instrument is done with
methane, and it calculates the corresponding values for propane and
hydrogen during the calibration process.
To ensure the instrument’s high reliability, you should avoid exposing
the sensor to dirt or moisture. This could cause a loss of sensitivity or
even destroy the sensor.
Gas sensors which are stored over a longer period of time loose their
functioning point. This is due to “pollution” (binding of oxygen) on the
sensor surface and can not be avoided with putting them to work. For
this reason it is advised to put the instrument to work regularly (every 2
to 3 days) and let it run for about 15 minutes. This way you don’t risk
having to wait when you want to use the instrument. A measurement
signal indicates the end of the warm-up time, which may take up to 45
minutes.
To eliminate dust on or inside the sensor cover, unscrew it and clean it
with compressed air as shown in the following illustration.
Important Information off sensor!
The sensor is highly corrosive environment to concentration of H
2
S
hydrogen sulphide, SO
x
sulphur oxide, Cl
2
chlorine, HCL hydrogen
chloride. This leading to corrosion or break of the wires or heater
material.
Furthermore the sensor may not be detected with alkaline material, salt-
water or water. This determine very high drift-performance of the sensor
(zero point stability). Dampness sensor skills under effect of frost
breaking and destroyed.
- 6 –
