WIKA TR10-L Mode D'emploi page 18

8. Safety-related instructions
Solid-machined thermowell
(minimum wall thickness 1 mm)
GB
Legend:
 Connection head
 Neck tube
 Connection to thermowell
 Measuring insert
Temperature class classification, ambient temperatures
A heating in the connection head can occur with built-in transmitter through faulty
electronics. The permissible ambient temperatures depend on the housings used and any
additionally-fitted head-mounted transmitter.
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:
Atmosphere
Gas atmosphere
Dust atmosphere
The temperature class is dependent upon the user application and the ambient temperature.
18
(minimum wall thickness 1 mm)
 Process connection
 Terminal block/transmitter
 Flame path fitting
Temperature class
T6
T5
T4
T85 °C
WIKA operating instructions models TR10-L, TC10-L (Ex d)
Protection tube
U Insertion length
NL Nominal length
N(M ) Neck length
H
maximum DC 30 V when the
B
Limits for ambient temperature
-50 ... +60 °C
-50 ... +75 °C
-50 ... +85 °C
-50 ... +60 °C
Without
thermowell
T4
T3
T1
T
undefined