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3 Product description
WIKA Operating Instructions - Differential pressure transmitter DPT-20
3.2 Principle of operation
DPT-20 is suitable universally for applications in virtually all industries.
It is used for the measurement of the following pressure types:
•
Differential pressure
•
Static pressure
Measured products are gases, vapours and liquids.
The differential pressure measurement enables the measurement of:
•
Level
•
Flow
•
Differential pressure
•
Density
•
Interface
The instrument is suitable for level measurement in closed, superim
-
posed pressure vessels. The static pressure is compensated by differ
-
ential pressure measurement. It is available as a separate measured
value for digital signal outputs.
Fig. 2: Level measurement with DPT-20 in a pressurized vessel
The flow measurement is carried out via an effective pressure trans
-
mitter, such as an orifice plate or pitot tube. The device records the
resulting pressure difference and converts the measured value into
the flow. With digital signal outputs, the static pressure is available as
a separate measured value.
Q
p
1
p
2
+
–
Fig. 3: Flow measurement with DPT-20 and orifice, Q = flow, differential pres
-
sure Δp = p
1
- p
2
Application area
Measured products
Measured variables
Level measurement
Flow measurement
