Wika TR25 Manuel d'utilisateur télécharger pdf (Page 20)

14073045.01 10/2013 GB/D

WIKA operating instructions model TR25 (Ex i)

7.4.2 Possible installation methods with the marking II 1/2 Ex ib IIC T6 Ga/Gb or

II 1/2 D Ex ib IIIC T65 °C Da/Db

The sensor or thermowell tip protrudes into Zone 0. The housing or connection head is in Zone 1

(Zone 21) or Zone 2 (Zone 22). It is sucient to use an Ex ib type circuit.

Zone separation is guaranteed if suciently-tight (IP 67) process connections are used.

Examples of suitable process connections include gas-tight standardised industrial anges,

threaded connections or pipe connections.

The welded parts, process connections, compression ttings, thermowells or housings used

must be designed such that they withstand all inuencing variables resulting from the process,

such as temperature, ow forces, pressure, corrosion, vibration and impacts.

Zones 1, 2 or

Zones 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

Zones 0, 1, 2 or

Zones 20, 21, 22

7. Information on mounting and operation in hazardous areas

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 51 52

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Wika TR25 Manuel d'utilisateur Page 20

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