Ion Science TVOC - Manual (Page 18)

TVOC MANUAL Ion Science Ltd
Page 18 of 32
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Calibration
Calibration routine
Ion Science recommends calibrating TVOC after any maintenance or lamp cleaning is carried out and on a 3
monthly basis to ensure TVOC is working to specification.
NOTE: Please read this entire calibration procedure before attempting a calibration.
TVOC calibration is undertaken in four steps:
1. Setting the ZERO (Using clean gas via carbon filter)
2. Setting the gas tolerance (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)
Setting the ZERO
1
– Place the calibration magnet over the top right hand corner of 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 displays a direct millivolt (mV) output from the PID sensor.
STATUS LED
ZERO LED
SPAN LED
FAULT LED
Calibration adaptor Carbon filter Hand
aspirator
Diagram 11
D iagram 12: LED’s
STATUS, ZERO, SPAN, FAULT
Diagram 13