TVOC 2 MANUAL
Ion Science Ltd
Page 7 of 32
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Introduction to TVOC 2
For installation requirements please refer to Installation and Technical Specification of this manual. Before attempting
an installation, please fully read and understand this user manual, and for hazardous area installations please also
refer to the TVOC 2 Intrinsically safe certificate for further details.
The TVOC 2 safety rating permits its deployment in all hazardous areas of the quoted (or less demanding) rating. For
detail please refer to the marking on your instrument (found on the front main label). Units are manufactured with two
protection concepts applied by separate certifications. Intrinsic safety (ia) and Non-sparking (nA).
a) Intrinsic Safety (ia) permits the deployment in areas where explosive gases (of group IIA, IIB and IIC) are intermittently
present (Zone 1) with an ambient temperature range of -20 to +50°C. Intrinsically Safe installations will require the use
of safety barriers and appropriate wiring.
b) Non-sparking (nA) permits deployment in areas where explosive gases (of group IIA, IIB, IIC) are unlikely, but possible
(Zone 2) with ambient temp range of -40°C to +50°C. Non-sparking installations do not require safety barriers however
the maximum working voltage should be strictly adhered to as a matter of safety. As no safety barriers are required there
is complete flexibility on the implementation of a three-wire system.
TVOC 2 does require regular calibration on site please see the Calibration section for more information. Calibration
mode is accessed via a magnetic switch.
