Vega VEGAFLEX 86 4 … 20 mA_HART - four-wire Bedienungsanleitung PDF herunterladen (Seite 21)

4 Mounting

VEGAFLEX 86 • 4 … 20 mA/HART - four-wire

41845-EN-130314

Generally a spacer at the probe end is sucient for rod probes to

avoid contact to the tube wall. Depending on the tube diameter or

tube length, spacers can be also mounted in the centre of the tube.

With cable probes it is also possible to strain the cable.

Keep in mind that buildup can form on the spacers. Strong buildup

can inuence the measurement.

Fig. 12: Position of the spacer or centering weight

1 Rod probe with spacer (steel)

2 Cable probe with centering weight

Note:

Measurement in a standpipe is not recommended for extremely

adhesive products.

Instructions for the measurement:

•

The 100 % point should not be above the upper tube connection

to the vessel

•

The 0 % point should not be below the lower tube connection to

the vessel

•

A false signal suppression with integrated sensor is generally

recommended to reach the maximum possible accuracy

Instruments for a temperature range up to 280 °C or up to 450 °C

have a distance piece between process tting and electronics hous-

ing. Ths distance piece is used for thermal decoupling of the electron-

ics against high process temperatures.

Mounting in the vessel

insulation

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Vega VEGAFLEX 86 4 … 20 mA_HART - four-wire Bedienungsanleitung Seite 21