10
3.
Put the device into calibration mode by pressing the
Select Function key
and turning the device on
.
Keep the select key pressed until the device
displays ‘Cb’.
Release the select
key.
4. The device will countdown from 15 to 0 with CAL symbol
ON. It will then display the blow icon.
5. Attach the connector and open the control valve (anti-
clockwise) until knob will not turn any further. The supply
of gas is .25L/minute.
6. Apply this flow until the device beeps after 20 seconds
then turn the gas off. The device will display the gas
concentration reading.
7.
If the reading is not 20 ppm, press the Select Function
key
for at least 3 seconds to accept the new
calibration value. The device will
say ‘dn’ (done) and then
will show 20 ppm.
It is advisable to accept the calibration even though it
displays 20 ppm. This will reset the calibration due timer.
Switch off the device if the calibration was incorrectly
performed. Do not press the Select Function key
To prevent incorrect calibration, only the readings within
the range of 16-
24 can be calibrated. An ‘Er’ (Error)
