Comet T311 Ex Series How To Use

Programmable transmitters T3110Ex, T3111Ex, T3113Ex with 4 - 20 mA outputs are designed for
measurement of relative humidity and temperature in a potentially explosive environments.
Electrical equipments for use in potentially explosive atmospheres are special devices that
can be a source of potential danger. Such devices must be designed, installed, operated
and maintained so as to not cause the explosion in potentially explosive atmosphere. The
basic information about equipments intended for use in the potentially explosive
atmosphere contains 94/9/EC (ATEX) Directive.
Potentially explosive atmosphere is an area, in which could be present the mixture of air and
flammable substances (gas, vapor, mist, combustible dust) in such concentration, that it
may catch fire. Explosion may be initiated by a spark or hot surface.
T311xEx transmitters are intrinsically safe. It is a way of equipment protection, which is based
on the limitation of energy (electrical and thermal) at a level lower than the level that could
cause ignition a specific hazardous atmospheric mixture.
The principle of intrinsic safety equipment lies in limitation of the amount of electric energy
supplied to electric circuits from power source and energy accumulated into parts of
electric circuits. Intrinsically safe zener barriers and intrinsically safe isolation amplifiers
are an elemental types of intrinsically safe interfaces designed to protect electrical circuits
installed in a potentially hazardous areas.
Transmitters T311xEx in compliance with European Directive 94/9/EC conforms to European
Standards EN 60079-0:2012 and EN 60079-11:2012.
 Type Examination Certificate:
 Marking:
Explanations:
The product is intended to surface sites with the presence of explosive atmospheres.
ll
3G The product is intended for use in areas where an explosive mixture of gas (vapour, mist) and air is not
likely to occur in normal operation and if it occurs it will exist only for a short time.
Ex It identifies that a protection mode against explosions has been adopted.
ic The protection mode by intrinsic safety according standard EN 60079-11
llC The product is intended to surface sites with the presence of explosive atmosphere - subgroup of C gas
T6 The temperature class (maximum surface temperature of the device is 85 °C at ambient temperature
60 °C)
Gc Equipment protection level (equipment for use in explosive atmospheres due to the presence of gas,
with a level of protection "increased" that is not a source of ignition in normal operation).
1
How to use the T311xEx transmitters
in potentially explosive environments
FTZÚ 13 ATEX 0189X
ll 3G Ex ic llC T6 Gc
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