Insertion Magnetic Flowmeter with differential welded nipple and ball valve

Insertion  Magnetic Flowmeter with differential welded nipple and ball valve   can be used for differential size . 

How JCDP Capacitive Differential Pressure Transmitter Work

JCDP/JCBP Capacitive Pressure Transmitter  operates on the principle that, if the sensing  diaphragm between
two capacitor plates is deformed by a differential pressure, an imbalance of capacitance will occur
between itself and the two plates.This imbalance is detected in a capacitance bridge circuit and
converted to a D.C. output  current of 4 to 20 mA.
 Another type of capacitor uses concentric hollow metal cylinders. The capacitance of this type just like theflat-plate type is proportional to the area.

This principle can be applied to differential pressure measurement, as shown in Figure. The pressure actingon the isolating diaphragms set up similar pressures in the silicone oil filling the space between them.

A net force proportional to the difference between the two pressures acts upon the metal sensing diaphragm and deflects it to one side or the other, depending on which input pressure is the greater.
 

he sensing diaphragm and capacitor thus form a differential variable separation capacitor. When the two input pressure are equal, the diaphragm is positioned centrally and the capacitances are equal.

A difference in the two input pressures causes displacement of the sensing diaphragm and is sensed as a difference between the two capacitances.

This change in capacitance is measured using a bridge circuit to measure the equivalent pressure signal.

BCST Introduction video