Ion Science TVOC - Manual (Page 7)

TVOC MANUAL Ion Science Ltd
Page 7 of 32
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Introduction to TVOC
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 (IS)
installations please also refer to the TVOC Intrinsically safe certificate for further details.
The TVOC 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). As of 1
st
of
October units will be manufactured with two protection concepts applied by separate certifications. Intrinsic
safety (ia) and Non sparking (nA). All units manufactured up to that date will only have intrinsic safety.
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 -20°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 does require regular calibration onsite please see the Calibration section for more information. TVOC
calibration mode is accessed via a magnetic on site switch system.