VEGA VEGAFLEX 86 4 … 20 mA_HART - four-wire - Manual (Page 21)

21
4 Mounting
VEGAFLEX 86 • 4 … 20 mA/HART - four-wire
41845-EN-130314
Generally a spacer at the probe end is sufficient 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 influence the measurement.
1 2
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 fitting 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