RKI Instruments GX-82A - Manual (Page 9)

Model GX-82A Instruction Manual
6 Hayward, California (510) 441-5656
Oxygen Sensor
The O
2
sensor is an electrochemical cell, which reacts to the oxygen
in the atmosphere, producing a current proportional to the oxygen
concentration. This current is converted by the GX-82A into an
oxygen reading.
CO, or H
2
S (toxic gas) Sensor
The toxic gas sensor is an electrochemical cell, which reacts to gas in
the atmosphere, producing a current proportional to the concentration
of gas. The current is converted by the GX-82A into a measurement of
gas concentration. The CO sensor uses a charcoal filter disk that
covers its opening, to eliminate interference from H
2
S.
To maintain sensitivity and stability, these sensors are kept on a
continuous bias current, even when the instrument power is off.
Batteries with an adequate charge must be installed to provide the bias
current.