Calibration; Calibration Routine; Setting The Zero - ION TVOC Instrument User Manual

TVOC MANUAL
7

Calibration

7.1 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 has 4 stages:

1. Setting the ZERO

2. Setting the gas tolerance
3. Setting the SPAN
7.2 Setting the ZERO
1 – Place the calibration magnet over the top right hand corner of the Ion Science logo to enter
calibration mode.
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.
displays a direct milivolt (mV) output from the PID sensor.
(Using clean gas via carbon filter)
(1 – 200 ppm Isobutylene on 0-100 ppm and 0-1000 ppm ranges)
(1 - 100 ppm Isobutylene on the 0-10ppm range)
(Using the SPAN gas)
The ZERO LED will illuminate and the GREEN STATUS LED will extinguish.
Calibration adaptor
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GREEN
STATUS LED
ZERO LED
SPAN LED
FAULT LED
The ZERO LED will flash, during this stage TVOC
Carbon filter
Ion Science Ltd
Hand
aspirator