Free Simple Circuit Diagram
Current loop transmitter is the term associated with sensor system that is used in industrial 4-20mA current loop technology. This transmitter contain the signal conditioning circuit for the sensor (chromel-alumel thermocouple), and a current regulator to maintain the current loop to consistently represents the sensor reading. Here is the schematic diagram of the circuit: When dealing with thermocouple, the feature […]
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Current regulator acts like a load when connected to a voltage source, or in series between voltage source and real load. The main characteristic of a current regulator circuit is that it will try to keep the current flowing through it to be constant, by dynamically adjusting its self resistance. The schematic diagram below show the circuit: The current will […]
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This is a 4 mA TO 20 mA CURRENT LOOP circuit. This circuit is used to transmit a signal over long distances. The accuracy of this circuit is not compromised by voltage drops across the line. This circuit must consume less than 4 mA, because the remote end must receive all of its power from the loop. This circuit require […]
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LM134 makes a good temperature sensor because it has a highly linear output characteristic. Because it is a current output device and is therefore not affected by long wire runs, LM134 is particularly useful in remote sensing applications. LM134 is easy to calibrate. It has good long term stability and can be interfaced directly with most data acquisition system, so […]
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