Ion Science TVOC - Manual (Page 19)

TVOC MANUAL Ion Science Ltd
Page 19 of 32
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Calibration
5 -
Slowly and repeatedly squeeze the hand aspirator to push clean air through the carbon filter and past
the PID sensor. The
‘ZERO LED’ will stop flashing after approximately 2 minutes.
6 – Now remove the equipment except for the calibration adaptor.
NB During the above process the 'mV' reading on the display must fall below 30 mV to pass the Calibration
stage.
An acceptable ZERO calibration level will result in the illumination of the
‘STATUS LED’.
An unacceptable ZERO calibration level will result in the illumination of the ‘FAULT LE’D. Should this occur
the TVOC will not proceed to the gas tolerance setting and return to normal operation the previous
calibration levels will be used. The Yellow
‘ZERO LED’ will be illuminated to indicate the failure to set a zero
calibration level.
Setting the gas concentration (The actual value that the calibration has been supplied at)
1
Now, again place the calibration magnet over the corner of the logo –
The GREEN or FAULT LED will be extinguished and the numeric
display will start to flash.
2 If the 0-10ppm range is selected you will be able to adjust between 1.0 ppm and 100ppm, for both
the 100 ppm and 1000 ppm ranges a concentration of between 1 and 200 ppm can be selected.
Leaving the magnet in position will cause the displayed number to cycle through the concentration,
remove the magnet when the displayed value matches that stated on the Calibration gas bottle.
Should you miss the desired reading quickly reapply the magnet to continue scrolling through the
numbers and remove the magnet at the desired figure.
The selected number will be recorded 5 seconds after the removal of the magnet when the display
stops flashing. The display will initially show 90, should this be the desired figure remove the magnet
straight away.
Setting the SPAN
1
Connect the SPAN gas to the calibration connector then the connector to the adaptor. Do not over
tighten the Luer fitting; only a one quarter turn is required.
Switch on the gas supply and then place the magnet over the logo.
The SPAN LED will flash and TVOC will display the direct millivolt (mV) output from the PID sensor.
Now remove the magnet.
Calibration adaptor SPAN gas
Calibration connector
Diagram 14