Wika TR10-A Manuel d'utilisateur télécharger pdf (Page 29)

WIKA operating instructions RTD and TC, intrinsically safe designs (Ex i)

3345267.12 01/2014 GB/D

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

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.

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.

7. Information on mounting, operation in hazardous area (Europe)

14094977.00

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Wika TR10-A Manuel d'utilisateur Page 29

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