TVOC 2 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 30 seconds.
6 –
Now remove the equipment except for the calibration adaptor.
Note:
During the above process the 'mV' reading on the display must fall below 200 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 LED’
.
Should this occur the TVOC 2
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 span gas concentration
(The actual value that the calibration has been supplied at)
1 –
Now, again place the calibration magnet over the logo –
The green ‘STATUS
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 0.1 ppm and 20ppm, 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 100, 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.
Switch on the gas supply and then place the magnet over the logo.
The yellow ‘
SPAN
LED’ will flash
and TVOC 2 will display the direct millivolt (mV) output from the PID sensor.
Now remove the magnet.
2
–
The ‘SPAN LED’ will stop flashing after approximately 2 minutes, 30 seconds.
3
–
Turn off the gas and disconnect the equipment
Diagram 13
Calibration adaptor
SPAN gas
Diagram 14
