TVOC 2 MANUAL
Ion Science Ltd
Page 20 of 32
Unrivalled Gas Detect
ion.
ionscience.com
Calibration
NOTE: During the span measurement process the mV reading of the span must be greater than the zero level to pass
the SPAN calibration stage.
An acceptable SPAN calibration level will result in the illumination of the green
‘STATUS LED’
.
An unacceptable SPAN calibration level will result in the illumination of the red
‘FAULT
LED
’
. Should this occur the
previous calibration levels will be used when the instrument returns to normal operation. The Yellow ‘SPAN LED’ will be
illuminated to indicate the failure to calibrate the span.
Now place the magnet over the logo to return to normal monitoring routine.
The green ‘STATUS LED’ will begin flashing as TVOC 2 starts.
IMPORTANT:
Unacceptable calibration levels will not be adopted; the instrument will default to the previously
stored acceptable calibration.
NOTE:
•
Always check the accuracy of your calibration by checking readings from TVOC when it is running normally
using the ZERO filter and SPAN gas.
•
Accuracy of calibration is the responsibility of the person carrying out the calibration. If in doubt seek advice.
•
TVOC must be calibrated after lamp/cell cleaning or general maintenance.
Causes of contamination and error in signal:
•
Changes in air pressure when detecting ppm concentration
•
Variation in oxygen, argon beyond ambient levels.
•
Variation in ambient moisture content.
