7
To calibrate the device, perform the following steps:
1. Connect the control valve (Cat No MC22) to the
20 ppm gas cylinder. (Cat. No. MC10) calibration
gas cylinder shown in the diagram above.
2. Connect the short plastic tubing reducing
connector (Cat No MEC1007).
3. Switch ON the device with 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 turn the control knob
fully counter-clockwise until knob will not turn any
further. The supply of gas is .25 L/second.
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 key
for at least 3 seconds to accept the new
calibration value. The device will say ‘dn’ (done)
and then will show 20 ppm.
