ROTARY INCRIMENTAL ENCODER

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

PlC OR DCS Analog Input block for 4-20ma, 1-5V input ,Hart 4-20ma Input

1) Current 4-20ma input from field sensor amplifier. 4-20ma current is converted to 1-5v using 250 ohms load resistor on interfacing board.
2) Current 4-20ma from transmitter given directly to AI module .
3) Current with Hart Signal given to AI module which supports to HART signal. Digital information superimposed on Analog signal.

Galvanic Isolation With Three Types Optical,Inductive Or Capacitive Isolation

Galvanic Isolation : Isolation of two grounds. Field ground and system ground isolated from each other.
1) Optical isolation : Hi speed. Require two independent supply for both the sides.
2) Inductive isolation : comparatively slow. Power generation in secondary will be possible.

De energized condition of 24v Dc Solenoid Coil monitoring Concept and Block Schematic

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Status of solenoid coil monitored continuously during De-energized condition. Very low Constant current injected for detecting open or short condition of Dc solenoid. Window comaparator for checking healthy status of solenoid. Energized condition is overriding condition and ignore action taken by detection circuit during this period. Healthy signal relay gives free potential contact for logical configuration of status.

Universal Analog Input Isolator Module for 4-20mA Input With 2 or 4 Wire Or 1-5v Output Voltage Configurable

Two or Four wire Transmitter : 2 or 4 wires required for operation of Transmitter.Four wire mode transmitter powered externally. 2 wire mode powered from AI module & series connection with load.
  1) 2 wire mode input : +24v dc power given by analog input module and return path is connected to load resistor inside Analog input module.
  2) 4 wire mode input : Transmitter powered externally. 4-20ma current given to current input AI module.
  3) 1-5v mode input : 4-20ma current from transmitter given to load resistor 250 ohms on field Interfacing Module. Output 1-5v given to voltage input AI module.

Oil Mixing by Weight

This post shows the circuit for oil mixing by weight.

First Blog

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