Circuit For Differential Pressure Measurement - HBM P3 Montageanleitung

Circuit for differential pressure measurement

8 Circuit for differential pressure measurement
Two transducers with the same full scale value can be readily interconnected,
in order to determine the relevant differential pressure signals. To do this, the
excitation voltage connections are connected in parallel and the measuring
voltage connections crossed over. The resultant resistance is now 175 Ω.
P
U
Transducer 1
P
U
Transducer 2
Fig. 8.1 Circuit diagram for differential pressure measurement
Transducer 1
Transducer 2
The available differential pressure signal is: U
22
bk
bu
gn
gy
rd
wh
bk
bu
gn
gy
rd
wh
Excitation voltage
bk
with
bk
A02239_05_YI0_02 HBM: public
VKK terminal box
bu
with
bu
.
= 1/2
A
to the amplifier
sw
bl
gn
U
B
gr
ws
rt
U = differential
A
pressure signal
U = bridge excitation
B
voltage
Measuring voltage
wh
with
rd
(U - U )
A1 A2
U
A
rd
with
wh
P3