Wika TR25 Manuel d'utilisateur télécharger pdf (Page 19)

WIKA operating instructions model TR25 (Ex i)

14073045.01 10/2013 GB/D

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

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.

Zones 0, 1, 2 or Zones 20, 21, 22

Hazardous area

Safe area

Thermowell

welded

TWxx

Process

connection

Connection head/

Field housing

Tx10-B

Tx10-C

Tx10-D

Tx10-H

Option:

with built-in

transmitter:

e.g. T32

Tx10-A

Process

connection

Compression

tting

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

Tx10-A

7. Information on mounting and operation in hazardous areas

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Wika TR25 Manuel d'utilisateur Page 19

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