differential presure cellgreenspun.com : LUSENET : PID Controller Tuning : One Thread
hows does a D.P cell actually. i know it converts head pressure to a 4-20mA signal for display. hows does it convert???
-- jason roche (firstname.lastname@example.org), April 16, 2004
hi D.P.Cell uses differential capacitance arrangement which consists of two fixed plates made of glass coated with gold and one movable plate between two fixed plates.when the pressure differential is zero differential capacitance is zero.differential capacitance varies in proportion with head.later it is converted in to mv by maens of bridge and then inst. ampl converts into 0-5V then V_I converter converts it to 4-20ma.
-- rk (email@example.com), September 16, 2004.