Wika PGS07 Manual do Utilizador descarregar pdf (Página 6)

11349167.03 10/2011 GB/D/F/E

WIKA operating instructions intelliGAUGE / switchGAUGE

3. Installation instructions / 4. Installation and ...

Diaphragm seal / protective barrier

In case of aggressive, hot, highly viscous, contaminated or crystallizing

pressure media, which must not be allowed to intrude the measurign

element, diaphragm seals have to be used as separating barrier. A neutral

transmission uid, used to transmit the pressure to the measuring element,

should be selected in consideration of the measuring range, the tempera-

ture and its compatibility with the pressure media.

The connection between the pressure gauge and the diaphragm seal must

not be released by no means.

Protection of the measuring element against overload

If the pressure media is subject to rapid pressure changes or pressure

impulses may be expected, these must not act directly upon the measuring

element. The eect of pressure impulses must be damped, e.g. by installing

an integrated restrictor screw (reduction of the cross section in the pressure

channel) or by connecting an adjustable throttle device in series.

Pressure test connection

The pressure test connection, with a suciently large bore size (≥ 6 mm

diameter), should be arranged, as far as possible, over a shut-o device,

in a position where the accuracy of the reading will not be aected by the

ow of the media being measured. The pipe between the pressure test

connection and the pressure instrument should have an inner diameter

large enough to avoid blockages or delays in pressure transmission. Also it

should not have any sharp bends. It is recommended that it is mounted with

a steep incline of approx. 1:15.

Piping

The piping should be arranged and tted so that it can withstand the

stresses caused by expansion, vibration and the inuence of heat. When

the media is gaseous, a water drain point should be provided at the lowest

point. For liquid pressure media, an air bleed should be provided at the

highest point.

4. Installation and commissioning

To acchieve a correct sealing of pressure connections suitable sealing

rings, sealing washers or WIKA prole seals have to be used. In order to get

the pressure instrument into an orientation that allows to read the on-site

indicator the best, a connector with an adjusting nut or an union nut is

recommended. When mounting and dismounting it is not allowed to tighten

the pressure instruments by using the housing, but on the spanner ats of

the stem, only.

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Wika PGS07 Manual do Utilizador Página 6