21
Model 44
The high and low process pressures (HP and LP) are fed via the diaphragm and supports
to the center section (silicone filled section)
of the meter body. The HP acts on the
pressure detecting diaphragm from the right hand side and the LP from the left hand side.
When a state of equilibrium is reached (zero differential pressure state), identical forces are
exercised on both sides of the differential pressure detecting diaphragm.
As the pressure of the HP side rises, the support moves leftward. The liquid fill flows
through the damping control
. The movement of the diaphragm is fed as a torque via the
torque arm
to the beam of the transmitter.
LP
HP
2
1
3
4
5
Diaphragm and support
Liquid fill
Damping control
Torque arm
Torque tube
Fig. 3-5. Operating principle of meter body
