Table of Contents
Advertisement
TVOC MANUAL
7
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 Zeroing process the mV reading on the display must reduce to below 30 mV to pass the ZERO
calibration stage.
An acceptable ZERO calibration level will result in the illumination of the GREEN LED.
An unacceptable ZERO calibration level will result in the illumination of the RED LED.
the previous zero calibration level will be used.
7.3 Setting the gas tolerance
1 –
Now, again place the calibration magnet over the corner of the logo -
The GREEN or RED 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 tolerance of between 1 and 200 ppm can be selected. Leaving
the magnet in position will cause the displayed number to cycle through the tolerance, 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.
7.4 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 ¼ turn is required.
Switch on the gas supply and then place the magnet over the logo.
The SPAN LED will flash
Now remove the magnet.
2 -
The SPAN LED will stop flashing after approximately 2 minutes.
3 –
Turn off the gas and disconnect the equipment
.
and TVOC will display the direct millivolt (mV) output from the PID sensor.
Calibration adaptor
Page 18 of 28
SPAN gas
Calibration connector
Ion Science Ltd
Should this occur
Advertisement
Table of Contents
