TVOC MANUAL
Ion Science Ltd
Page 23 of 32
7
Calibration
An acceptable SPAN calibration level will result in the illumination of the GREEN LED.
An unacceptable SPAN calibration level will result in the illumination of the RED LED. Should this occur the
previous span calibration level will be used.
Now place the magnet over the logo corner to return to normal monitoring routine.
The GREEN LED will start flashing as TVOC starts its cycle with a lamp ON cycle.
If either the ZERO and/or SPAN levels where outside acceptable levels the RED LED will flash until an
acceptable calibration has been carried out.
Unacceptable calibration levels will NOT be used, TVOC will default to the previously stored acceptable
calibration factor.
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.
NOTE: Causes of contamination and error in signal:
*
Changes in air pressure when detecting ppm concentration
*
Variation in Oxygen and / or Argon beyond ambient levels.
*
Variation in ambient moisture content.
