WIKA TC8 Serie Betriebsanleitung Seite 12

3. Commissioning, operation
Marking: II 2/-G Ex db IIC T6 ... T1 Gb/-
The flameproof case or the connection head is in zone 1 (or zone 2). The sensor is located
in a non Ex zone.
EN For all WIKA connection heads with built-in WIKA temperature transmitters, the
following interrelation is valid:
The temperature increase on the surface of the connection head or case is less than 25 K
if the following conditions are observed: Power supply U maximum DC 30 V when the
B
transmitter is operated in a current limitation of 22.5 mA.
A heating in the connection head can occur with variant 2 through faulty electronics. The
permissible ambient temperatures depend on the case used and any additionally fitted
head-mounted transmitter.
However, an impermissible heat reflux from the process which can exceed the operating
temperature of the case or the temperature class, must be prevented through suitable heat
insulation or a suitably long neck tube.
3.5.3 Variant 3
The thermometer is fitted to certified equipment (transmitter) with an ignition protection
type of "flameproof enclosure".
The signal is a current signal (4 ... 20 mA), voltage signal (0 ... 10 V) or fieldbus signal,
which is generated by an ATEX/IECEx Ex d certified field transmitter.
Only field transmitters listed by name in the appendix of the Ex d certificate may be used.
Marking: II 2/-G Ex db IIC Gb/-
The flameproof case or the connection head is in zone 1 (or zone 2). The sensor is located
in a non Ex zone.
The main marking for models TC82/TC83 is found on the certified connection housing or
Ex d field transmitter.
3.6 Electrical mounting
Using a transmitter/digital display (option):
Observe the contents of the operating instructions for the transmitter/digital display (see
scope of delivery).
The permissible ambient temperature ranges can be taken from the corresponding
operating instructions.
Observe the special conditions (see chapter 4 "Special conditions for use (X conditions)",
point 3).
12 WIKA additional information TC82, TC83, flameproof enclosure (Ex d)