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TVOC MANUAL
4
TVOC Setup
IMPORTANT: if the 10ppm range is selected the TVOC will require a calibration using 10ppm Isobutylene
before use. (See the calibration section of this manual)
NOTE:
* TVOC is shipped with all selector pins fitted as standard
* TVOC only reads the selector pin settings when power is connected.
Always ensure power is disconnected from TVOC before changing
setting or carrying out maintenance.
* Never place selector pins on the programming port connector.
* Ensure static build up is discharged before touching components.
4.2 Duty Cycle
The TVOC has a variable duty cycle whereby the lamp is ON for 5 seconds and then OFF for a user set
period between 0 to 5 minutes in 1 second increments. The 4 – 20 mA output is updated at the end of each
cycle. As standard the TVOC duty cycle is 1 minute – the lamp is ON for 5 seconds and OFF for 55 seconds.
The lamp OFF time is fully adjustable by the user. Please see page 15of this manual for full instructions.
Page 10 of 28
Ion Science Ltd
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