Wika 73 Manual do Utilizador descarregar pdf (Página 13)

11591367.02 05/2012 GB/D/F/E

WIKA operating instructions models 73, 74 (ATEX) 13

■

If possible, the entire length of the stem should be exposed to the

temperature being measured. However, at least the length of the

active part that corresponds to the length of the gas expansion

vessel (active length).

■

In pipelines or other measuring points, the temperature probe must

be angled as far towards the ow as possible.

■

Errors in thermal conduction occur if the area where the

temperature is to be measured is so small, that the mass of the

temperature probe acts as thermal capacity. Errors in thermal

conduction may also occur if the immersion depth is insucient, if

the mounting ttings are connected to a good thermal conductor

(metal plate or similar) and there is a considerable dierence

in temperature between the measuring and mounting element

temperatures.

■

Mount the indicator case free from vibration. If necessary, it is

possible to isolate the instrument from the mounting point by

installing a exible connection line between the measuring point

and the thermometer and mounting the instrument on a suitable

bracket.

If this is not possible, the following limit values must not be exceeded:

Dry gauges: Frequency range < 150 Hz

Acceleration < 0.7 g (7 m/s

)

Liquid-lled gauges: Frequency range < 150 Hz

Acceleration < 2 g (20 m/s

)

6. Commissioning, operation

After mounting, set the compensating valve (if

available) from CLOSE to OPEN.

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Wika 73 Manual do Utilizador Página 13