WIKA TR Serie Instructions Complémentaires page 12

3. Commissioning, operation
3.5 Mounting examples
3.5.1 Possible installation methods with the marking II 1G Ex ia IIC T6 Ga or
II 1D Ex ia IIIC T65 °C Da
EN
Zones 0, 1, 2 or zones 20, 21, 22
Thermowell
TWxx
Thermowell
TWxx
The sensor together with case or connection head is located in zone 0 (zone 20). An Ex
ia type circuit must be used. Connection heads/cases made of aluminium are usually not
permitted in zone 0. At this position, WIKA recommends connection heads/cases made of
stainless steel.
Protection measures for applications that require EPL Ga or Da:
For the case where a light metal case is used in zone 0, the following protective measures apply:
Operationally based friction or impacts between light metal instrument components or their
alloys (e.g. aluminium, magnesium, titanium or zirconium) and instrument components
from iron/steel, are not permitted. Operationally based friction or impacts between light
metals are permitted.
Observe the special conditions (see chapter 4 "Special conditions for safe use
(X conditions)", point 5 and 7).
12
Process
connection
Compression
fitting
welded
Process
connection
Connection head/
Field case
WIKA additional information, models TRxx and TCxx (Ex i)
Hazardous area
Tx10-H
Tx10-A
Option:
with built-in
transmitter
e.g. T32
Tx10-H
Tx10-A
Tx10-C
Tx10-D
Tx10-A
Tx10-B
Tx10-C
Tx10-A
Non-hazardous area
Associated
electrical equipment
Intrinsically
safe supply or
suitable barrier
Intrinsically
safe supply or
suitable barrier
Intrinsically
safe supply or
suitable barrier
Intrinsically
safe supply or
suitable barrier