Wika TR12-M Uživatelský manuál stáhnout pdf (Strana 21)

7. Information on mounting ... / 8. Safety-related instructions ...

11419904.02 09/2013 GB/D

WIKA operating instructions models TR12, TC12 (Ex d) 21

■

Mounting within non-metallic enclosures:

All electrically-conductive thermometer components within the hazardous area must be

provided with equipotential bonding.

■

Neither repairs nor structural modications are permitted, and any would void the

guarantee and the respective certication.

■

The manufacturer shall not be responsible for constructional modications after delivery

of the instruments.

8. Safety-related instructions for the dierent variants

8.1 Variant 1:

ATEX/IECEx Ex d housings or connection heads (with connection terminals, without

transmitter). Evaluation of the resistance or the thermoelectric potential between electronics

outside of the hazardous area.

Use in zone 1, marking II 2G Ex d IIC T1-T6 Gb

The ameproof housing or the connection head is in zone 1 (or zone 2). The sensor is in

zone 1. In the case of a separation of Ex-zones, a thermowell (from corrosion-resistant

steel, min. wall thickness 1 mm) must be used. In this case, no power limitation is needed,

since no failure source can occur from the evaluation electronics.

Use with a thermowell at the partition to zone 0, marking II 1/2G Ex d IIC T1-T6 Ga/Gb

The ameproof housing or the connection head is in zone 1 (or zone 2). The sensor is

within a thermowell (min. wall thickness 1 mm) which extends into zone 0 via a process

connection.

The thermometer should therefore be operated with a power-limiting circuit.

max

: 2 W

max

: 30 V

A power supply with Ex ia circuitry fullls these conditions, but is not required if the limits

can be achieved through other measures. The responsibility rests with the operator.

Temperature class classication, ambient temperatures

For all WIKA connection heads, the following ambient temperature range applies:

(-50)

) -40 … +80 °C

1) The value in brackets applies only for specic low-temperature designs

The permissible ambient temperatures for third-party products can be seen from the

relevant approvals and/or data sheets.

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Wika TR12-M Uživatelský manuál Strana 21