WIKA DPT-20, Руководство по эксплуатации

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4 Mounting
WIKA Operating Instructions - Differential pressure transmitter DPT-20
•
In vacuum applications: Mount DPT-20 below the measurement
loop
•
The ambient temperature should be the same for both capillaries
+
–
1
4
2 2
3
Fig. 23: Measurement setup, differential pressure measurement in gases,
vapours and liquids
1 Chemical seal with slotted nut
2 Capillaries
3 E.g. filter
4 DPT-20
4.5.5 Density
•
Mount device below the lower chemical seal
•
The distance between the two measurement points must be as
large as possible to ensure a high measurement accuracy
•
The ambient temperature should be the same for both capillaries
= ∆p
h g
+
–
0,3 m
Fig. 24: Measurement setup for density measurement
Density measurement is only possible when the level remains above
the upper measuring point. If the level falls below the upper meas-
uring point, the measuring system continues to work with the last
density value.
This density measurement functions with open as well as closed ves -
sels. Make sure that small density changes cause only small changes
to the measured differential pressure.
Distance between the two measurement points 0.3 m, min. density
1000 kg/m³, max. density 1200 kg/m³
Density measurement
Example