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TVOC MANUAL
6
Operation
6.3 LED's
The GREEN LED indicates TVOC's working status
The RED LED indicates Fault status
Please see Section 7 Calibration for YELLOW LED status.
6.4 Selector pins
TVOC has a range of options that are selected via the selector pins on the back of the main PCB (please see
page 9TVOC Set up).
The options are shown below with the defaults highlighted in bold:
1-1000ppm
ppm units
6.5 Calibration mode
TVOC calibration mode can be accessed using the calibration
magnet supplied in the TVOC calibration tool kit (Part number:
A-845214).
To enter calibration place the magnet over the top right of the
Ion Science Logo until the state changes (i.e. an LED illuminates
and/or the display changes).
Ensure the magnet is withdrawn away from the magnetic switch
by at least 1 cm once a change has occurred.
6.6 Calibration gases
TVOC has three (3) ranges that can be selected however the 0-10ppm range requires the instrument is
calibrated by the user before use. The 0-100ppm and the 0-1000ppm ranges can initially run using the
Factory calibration carried out during the instruments manufacture, however because the 0-10 ppm range is
more sensitive and more susceptible to environmental and system tolerances the instrument must be
calibrated before use.
If the 0-10 ppm range is selected TVOC will display the following
screen to indicate that a calibration is required before it can be used.
Follow the calibration instructions before use.
ON
Indicates the PID lamp is OFF
Flashing
Indicates the PID lamp is ON
ON
Indicates TVOC cannot function correctly. The 4-20mA output drops
to 3.5mA.
URGENT attention is required.
Flashing
Indicates the last calibration carried out was outside expected
limits. The instrument will continue working but service is required.
or
or
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0.01 - 10 ppm or 0.1 - 100 ppm
3
mg/m
units
Ion Science Ltd
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