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English 18259
3. USING THE ANALYSER AND ITS FOUR BUTTONS:
Switching
ON the
analyser
Press the button to switch the unit ON in fresh air. This allows
the analyser’s sensors to be calibrated. This will set CO to zero and
CO
2
may be set to 400 ppm if required.
At switch on, the analyser beeps four times and displays the model
number. The bottom line counts down from typically 45 .
The Analyser will then indicate AIR ZERO NO?
Select NO? using the push button marked with an enter symbol, the
CO
2
setting will not be altered, CO is always set to zero at this stage.
Select YES only if you are in fresh air and wish to adjust the CO
2
zero offset. Use the UP/DOWN buttons to set the required value (this
should be 400ppm in fresh air), allow a few seconds after each button
press for readings to settle, and then press ENTER to confirm.
After ENTER is pressed it will take about 4 seconds before the unit is
ready to respond to the controls.
The sensors are now ready to use. If the analyser will not calibrate,
one or more of the sensors may need to be replaced or recalibrated by
an authorized repair centre.
When countdown and zero is finished the display’s top line shows the
last selected function and the bottom line displays whatever the rotary
dial is turned to.
Switching
OFF the
analyser
Press the button to switch the analyser OFF. The display
counts down from 30 with the pump on to allow time for the sensors
to be cleaned or purged with fresh air. If the probe is connected,
make sure both analyser and probe are in fresh air.
Press HOLD / ENTER if you want to stop the count-down to off and
return to making measurements.
