WIKA TR10-W Betriebsanleitung Seite 20

8. Safety-related instructions for the different variants
Temperature class classification, ambient temperatures
A heating in the connection head can occur with variant 2 through faulty electronics. The
permissible ambient temperatures depend on the housing used and any additionally-fitted
head-mounted transmitter.
GB
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 housing is less than
25 K if the following conditions are observed: power supply U
transmitter is operated in a current limit of 22.5 mA.
This yields the following temperature class classification.
Temperature class
T6
T5
T4, T3, T2, T1
The permissible ambient temperatures for third-party products can be seen from the
relevant approvals or data sheets. However, an impermissible heat reflux from the process
which can exceed the operating temperature of the housing or the temperature class, must
be prevented through suitable heat insulation or a suitably long neck tube.
8.3 Variant 3
ATEX/IECEx Ex d certified temperature transmitters.
The evaluation is performed using current (4 ... 20 mA), voltage (2 ... 10 V) or fieldbus
signal, which is generated by an ATEX/IECEx Ex d certified temperature transmitter.
Use in zone 1, marking II 2G Ex d IIC Gb
The Ex d field transmitter is located in zone 1 (or zone 2). The sensor is within a thermowell
(min. wall thickness 1 mm) which extends into zone 1 via a process connection.
The main Ex marking is located on the certified Ex d field transmitter. The TR10-W and
TC10-W instruments are marked with a foil plate on the neck tube.
For a possible use at the partition to zone 0 with a thermowell, the approvals and conditions
of the relevant Ex d field transmitters must be followed.
Temperature class classification, ambient temperatures
Ambient temperature range for the measuring insert with neck tube: -40 ... +85 °C.
The permissible ambient temperatures of the certified Ex d field transmitter must be taken
from the respective operating instructions or data sheets. Through deviations in temperature
ranges, limitations can occur.
20
Ambient temperature
-40 ... +55 °C
-40 ... +75 °C
-40 ... +85 °C
WIKA operating instructions models TR10-W, TC10-W (Ex d)
maximum DC 30 V when the
B