Wika PGS07 Manual do Utilizador descarregar pdf (Página 4)

11349167.03 10/2011 GB/D/F/E

WIKA operating instructions intelliGAUGE / switchGAUGE

1. Safety / 2. Operating principle

1. Safety

The appropriate national safety regulations (e.g. EN 837-2

„Selection and installation recommendations for pressure

gauges“) must be ob-served when installing, commissio-

ning and operating these devices.

■

Serious injuries and/or damage may occur should the appropriate

regulations not be observed.

■

Only appropriately qualied personnel should work on these

instruments.

■

The eective maximum surface temperature is not dependant upon

the device, but mainly on the temperature of the respective pressu-

re medium! In the case of gaseous substances, the temperature

may increase due to compression warming. In these cases it may

be necessary to throttle the rate of change of pressure or reduce

the permissible temperature of the pressure medium.

2. Operating principle

Bourdon tubes are widely used as measuring elements for technical

pressure measurement due to their robustness and ease-of-use. Under

the inuence of pressure these measuring elements will deform within their

elastic range.

This movement is converted into a rotary motion by means of a mechanical

movement (gear). A magnet, xed to the pointer axle, turns with the

instrument´s pointer in direct proportion to the process pressure. The

electronics positioned facing the magnet detect the rotational motion of the

magnet.

The electronics’ non-contact sensor element (Hall sensor), aected by the

magnetic eld, detects any changes, free from any friction and wear to the

measuring element.

The sensor signal, which is in direct proportion to the angle of motion, is

transformed into an output signal. The span of the electrical output signal

corresponds to the measuring span of the dial.

An intelliGAUGE line pressure gauge with electrical output signal combines

all the advantages of an on-site display without the need for an external

power supply, with the demands of modern electronic measurement for

electrical signal transmission.

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