Wika TC10-L Instrukcja Użytkownika Pobierz pdf (Strona 12)

3370964.05 04/2014 GB/D/F/E

WIKA operating instructions models TR10-L, TC10-L (Ex d)

4. Design and function

4.1 Description

The model TR10-L (resistance thermometer) or TC10-L (thermocouple) electrical

thermometers are comprised of a measuring insert which is built into a certied Ex d

housing. In combination with a ame path tting that is screwed into the head, the measuring

insert functions as a ameproof joint. The measuring insert (TR10-K, TC10-K) is replaceable.

Sensor design in model TR10-L

The measuring resistor is embedded in ceramic powder, heat-resistant potting compound,

cement compound or thermally conductive paste. A one-sided sealed tube, which is welded

to a mineral-insulated cable, forms the external shell of the sensor tip of the measuring

insert.

Sensor design in model TC10-L

The measuring insert of the thermocouple is manufactured from mineral-insulated cable.

The thermocouple consists of the internal leads of the mineral-insulated cable. The weld

spot of the thermocouple is, depending on the design, either ungrounded welded with the

sheath of the mineral-insulated cable or grounded welded.

If the temperature sensor is designed as a grounded thermocouple, the thermocouple is

joined directly to the sheath. Designs with a diameter smaller than 3 mm and with grounded

thermocouples should be considered as galvanically connected with earth potential.

Versions (see gures page 18):

■

Thermometers without a ame path tting may only be used in combination with a

solid-machined, certied WIKA thermowell with a minimal wall thickness of 1 mm. The

thermometer is marked with IIC and is suitable for use in zone 1.

■

After installation of a ame path tting into the connection head of the thermometer, a

thermowell is no longer mandatory for certication reasons. In most cases, however,

the use of a thermowell (solid-machined or fabricated, with a wall thickness of 1 mm) is

necessary for process engineering reasons. The thermometer is marked with IIB + H

and

is suitable for use in zone 1.

The design of the thermowell can be selected as desired, but the operational process

data (temperature, pressure, density and ow rate) must be taken into account. If a solid

WIKA thermowell is already available or installed, a ame path tting is not necessary.

The thermometers models TR10-L or TC10-L are manufactured by WIKA with certied

Ex d connection heads or connection housings. These enclosures and covers are made

from aluminium or stainless steel. The cover is optionally available with a glass window.

4. Design and function

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Wika TC10-L Instrukcja Użytkownika Strona 12