WIKA TR10-L Manual De Instrucciones página 11

2. Safety
Thermowell
(minimum wall thickness 1
mm)
Legend:
 Connection head
 Neck tube
 Connection to thermowell/protection tube
 Measuring insert
Temperature class classification, ambient temperatures
A heating in the connection head can occur with built-in/connected transmitter through
faulty electronics. The permissible ambient temperatures depend on the case 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 case is less than 25
K if the following conditions are observed: auxiliary power U
the transmitter is operated in a current limitation 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 temper-
ature.
WIKA operating instructions, models TR10-L, TC10-L, TR10-0, TC10-0 (Ex d)
Thermowell/protection
tube
(minimum wall thickness 1 mm)
 Process connection
 Terminal block/Transmitter
 Flame path
Temperature class
T6
T5
T4
T85 °C
Without thermowell/pro-
tection tube
maximum DC 30 V when
B
Limits of ambient temperature
-20 ... +60 °C [-4 ... +140 °F]
-20 ... +75 °C [-4 ... +167 °F]
-20 ... +80 °C [-4 ... +176 °F]
-20 ... +60 °C [-4 ... +140 °F]
Welded threaded
connection
welded
11
EN