Ion Science TVOC - Manual (Page 17)

TVOC MANUAL Ion Science Ltd
Page 17 of 32
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Operation
LED’s
see Diagram 12
The green
indicates TVOC’s working status:
ON Indicates the PID lamp is OFF
Flashing Indicates the PID lamp is ON
A red indicates fault status:
ON Indicates TVOC cannot function correctly. The 4-20mA output drops
to 3.5mA.
URGENT attention is required.
Flashing Indicates the TVOC cannot function but a reading is being
attempted
A yellow Zero LED indicates during normal operation
ON Last calibration zero level was outside expected limits
(The instrument will operate normally with the previous calibration)
A yellow Span LED indicates during normal operation
ON Last calibration Span level was outside expected limits
(The instrument will operate normally with the previous calibration)
last calibration carried out was outside expected limits. The instrument will continue
working but service is required.
Please see Section 7 Calibration for YELLOW LED status.
Selector pins
TVOC has a range of options that are selected via the selector pins on the back of the main PCB (please see
the
‘TVOC Set up’ Section).
The options are shown below with the defaults highlighted in bold:
1-1000ppm or 0.01 – 10 ppm or 0.1 – 100 ppm
ppm units
or mg/m
3
units
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Ensure the magnet is withdrawn away from the magnetic switch by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.
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 0-1000 ppm 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.
Diagram 10