TVOC MANUAL
Ion Science Ltd
Page 18 of 32
6
Operation
7 - After 5 seconds the entire output frequency is displayed.
8 - After a further 5 seconds the set frequency will be set in the
TVOC memory.
9 - TVOC then continues through the standard start-up routine.
If you are unhappy with the update frequency you have set you can adjust the time by placing the
calibration magnet over the logo during the 5 seconds after the total time has been shown (point 8 above).
NOTE: The total duty cycle time includes the 5 seconds lamp ON time. Therefore if you wish your total duty
time to be approximately 2 minutes set the lamp OFF time to 1 minute 55 seconds.
At the end of the ‘Start up’ routine TVOC will enter the selected monitoring routine.
6.3 LED’s
The GREEN LED indicates TVOC’s working status
ON
Indicates the PID lamp is OFF
Flashing
Indicates the PID lamp is ON
The RED LED indicates Fault status
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.
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
Section 4 TVOC Set up).
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
