Monday 11 August 2014

MICRO CONTROLLER WITH COM PORTS FOR INTERFACING


CONVENTIONAL AND HART TRANSMITTER PRINCIPALS


CRYDOM CROUZET MOSFET BASE DC SSR

Inductive Dc Solenoid load which generates back e.m.f while switching 'off ' action of solenoid. Freewheeling diode across and near to load is shortest path for this generated back E.M.F.  Fast de-magnetization with this diode.

CRYDOM CROUZET AC SSR FOR CONTACTOR LOAD


LM317 CONSTANT CURRENT MODE OR SOLID STATE FUSE FOR TRANSMITTERES

Normally it is working for 24v supply line of 4-20ma Transmitter. lm317 acting as unidirectional solid state fuse. Minimum voltage drop across circuit  is >3v irrespective of output current. Adjust terminal floating on output load.

OPTICALLY ISOLATED ANALOG ISOLATOR USNIG SERVO GAIN AMPLIFIER