Mounting Examples - WIKA RTD Zusatzinformation

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
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 of use (X conditions)",
point 5 and 7).
WIKA additional information RTD and TC, intrinsically safe designs (Ex i)
Process
connection
Compression
fitting
welded
Process
connection
Connection head/
Field case
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
EN
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