TVOC 2 MANUAL
Ion Science Ltd
Page 18 of 32
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Hand aspirator
Calibration
Calibration routine
Ion Science recommends calibrating TVOC 2 after any maintenance or lamp cleaning is carried out and on a 3 monthly
basis to ensure TVOC 2 is working to specification.
NOTE: Please read this entire calibration procedure before attempting a calibration.
TVOC 2 calibration is undertaken in three steps:
1. Setting the ZERO
(Using clean gas via carbon filter)
2. Setting the span gas concentration
(1 – 200 ppm Isobutylene on 0-100 ppm and 0-1000 ppm ranges)
(0.1 – 20.0 ppm Isobutylene on the 0-10ppm range)
3. Setting the SPAN
(Using the SPAN gas)
Diagram 11
Setting the ZERO
1 –
Place the calibration magnet over the Ion Science logo to enter calibration mode.
The ‘
ZERO LED’
will
illuminate and the
‘STATUS LED’
will extinguish.
2 –
Remove the calibration magnet
3 –
Insert the calibration adaptor into the sensor cap, attach the carbon filter to the calibration adaptor. The
carbon filter should be attached to the hand aspirator.
4 –
Again place the calibration magnet over the logo.
The ‘
ZERO LED’
will flash, during this stage TVOC 2 displays
a direct millivolt (mV) output from the PID sensor.
Diagram 12
Calibration adapter
Carbon filter
STATUS LED
ZERO LED
SPAN LED
FAULT LED
