EN
14302224.0
1
01/2023
EN/DE
Additional operating instructions TC82, TC83, intrinsically safe designs (Ex i)
18
4.1.3 Variant 3
The thermometer (module) model TC82-M or TC83-M is fitted to a certified equipment
(field transmitter) in the type of protection “Intrinsically Safety”.
The position of the marking label for the complete assembly TC82-F or TC83-F is on the
neck tube. The original marking of the field transmitter remains unchanged.
4.1.4 Modules
The module TC82-M, TC83-M is designed to fit to a suitable enclosure by the end user. The
module is marked without temperature class on the neck tube. All conditions and limitations
described for the variants 1 to 3 apply to this combined equipment. The responsibility rests
to the operator. An operation without a suitable enclosure is not permitted.
4. Special conditions ... (X conditions) / 5. Measures to reduce ...
5. Measures to reduce the risk of ignition
Variant 1:
These variants are simple electrical apparatus in the definition of EN/IEC 60079-11 and
have no internal ignition source of their own. A heating in the enclosure cannot happen,
therefore a thermal ignition is avoided.
The relevant clearances and creepage distances for the terminals, 6 mm between separate
intrinsically safe circuits, 3 mm to grounded conductive parts, are ensured by using suitable
terminal blocks. The requirements for the enclosures are described in the section „Special
conditions for safe use“. Likewise the distance to hot surfaces. The resistive spark ignition
is avoided by the limitation of the input parameters (Ui, li and Pi).
The maximum current that can occur is less than 50 % of the maximum permissible short-
circuit-current, even for a factor of safety of 1.5.
■
Inductive spark ignition: The internal inductance is negligibly small.
■
Capacitive spark ignition: The internal capacitance is negligibly small.
Variant 2 and variant 3:
These variants are „assemblies“ (combined equipment) in the scope of the ATEX directive
respectively intrinsically safe electrical systems according to IEC60079-25.
Variant 2:
In this case, electronic equipment such as head-mounted temperature transmitters and/or
digital displays are installed in the enclosures.
