Wika TR75 Manual do Utilizador descarregar pdf (Página 19)

11325232.04 01/2014 GB/D/F/E

WIKA operating instructions DiwiTherm

, model TR75 19

3. Position the indicator as required, tighten the hexagon bolts and slotted screws, and nally

tighten the lock nut or union nut rmly.

Observe the following points during sensor installation:

■

If possible, the entire length of the sensor should be exposed to the temperature being

measured.

■

In pipelines or at other measuring points, the temperature sensor should be directed as

far towards the ow as possible.

■

When using thermowells, ll a thermal contact medium in order to reduce the heat

transfer resistance between the outer wall of the sensor and the inner wall of the

thermowell if possible. The working temperature of the heat conductive paste is

-40 ... +200 °C.

WARNING!

Do not use any heat transfer oil!

6.1 Parallel threads

If the thermometer connecting head, neck tube, thermowell or process connection are

connected with parallel threads (e.g. G ½, M20 x 1.5 ...), these threads must be secured

using seals which prevent liquids from penetrating into the thermometer.

As standard, WIKA uses copper prole seals for the connection between the neck tube

and the thermowell, and at paper seals for the connection of the connection head and the

extension neck or thermowell.

If the thermometer and the thermowell are already connected, the seals will already be

mounted. The plant operator must check whether the seals are suitable for the operating

conditions and must replace them, if necessary, with suitable seals.

For thermometers without a thermowell, and/or where these are delivered separately, the

seals are not included and must be ordered separately.

Tighten the threads by hand when carrying out the nal assembly on the plant. This will

correspond to the delivery status of the premounted components. The nal tightening torque

should be applied using a spanner (half rotation).

The seals must be replaced after dismantling!

The seals can be ordered from WIKA, indicating the WIKA order number and/or

the designation (see table).

6. Commissioning, operation

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Wika TR75 Manual do Utilizador Página 19