26
4 Mounting
WIKA Operating Instructions - Differential pressure transmitter DPT-20
Carry out min. adjustment for the differential pressure measured with
density 1.0:
Δp = ρ • g • h
= 1000 kg/m³ • 9.81 m/s
2
• 0,3 m
= 2943 Pa = 29.43 mbar
Carry out max. adjustment for the differential pressure measured with
density 1.2:
Δp = ρ • g • h
= 1200 kg/m³ • 9.81 m/s
2
• 0.3 m
= 3531 Pa = 35.31 mbar
4.5.6 Interface
•
Mount device below the lower chemical seal
•
The ambient temperature should be the same for both capillaries
+
–
0,3
m
0,8
1,0
Fig. 25: Measurement setup with interface measurement
An interface measurement is only possible if the densities of the two
media remain the same and the interface is between the two meas-
urement points. The total level must be above the upper measurement
point.
This density measurement functions with open but also with closed
vessel.
Distance between the two measurement points 0.3 m, min. density
800 kg/m³, max. density 1000 kg/m³
Carry out min. adjustment for the differential pressure which is meas
-
ured at the height of the interface on the lower measurement point:
Δp = ρ • g • h
= 800 kg/m³ • 9.81 m/s • 0.3 m
= 2354 Pa = 23.54 mbar
Carry out max. adjustment for the differential pressure which is meas
-
ured at the height of the interface on the upper measurement point:
Δp = ρ • g • h
= 1000 kg/m³ • 9.81 m/s • 0.3 m
= 2943 Pa = 29.43 mbar
Interface measurement
Example
