Mounting Examples In Hazardous Areas - WIKA TR25 Betriebsanleitung

7. Information on mounting and operation in hazardous areas

7.4 Mounting examples in hazardous areas

7.4.1 Possible installation methods with the marking II 1G Ex ia IIC T6 Ga or
II 1D Ex ia IIIC T65 °C Da
Zones 0, 1, 2 or Zones 20, 21, 22
Thermowell
TWxx
Thermowell
TWxx
The sensor together with housing 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 not
permitted in zone 0. At this position, WIKA uses connection heads/cases made of stainless
steel.
WIKA operating instructions model TR25 (Ex i)
Process
connection
Compression
fitting
welded
Process
connection
Connection head/
Field housing
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
Safe 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
EN
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