Ion Science TVOC - Manual (Page 15)

TVOC MANUAL Ion Science Ltd
Page 15 of 32
Unrivalled Detection. www.ionscience.com
Installation
– Hazardous location
4-wire Control equipment sensing 4
– 20 mA on return line
Notes:
 For intrinsically safe installations, the enclosure may be opened while the system is live,
provided the work is undertaken by competent personal and suitable safety precautions are
taken. This overrides the warning on the enclosure label.
Initial calibration
TVOC is calibrated at Ion Science before dispatch using 100 ppm Isobutylene. However, if you wish to
calibrate your TVOC after installation, Ion Science recommends that the TVOC is left to run on its chosen
settings (see
‘TVOC Setup Section’) for 24 hours before an initial calibration is carried out, to allow the
instrument to stabilise.
Diagram 8