RKI Instruments GX-86A - Manual (Page 9)

Model GX-86A Instruction Manual
Page 8 Hayward, California (510) 441-5656
atmosphere, producing a current proportional to the concentration of
gas. The current is converted by the GX-86A 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.