Tag «Current Loop»

Chromel Alumel Thermocouple Current Loop Transmitter

The schematic diagram below show signal conditioning circuit for remote current loop temperature transmitter. This thermocouple temperature transmitter is loop powered, means it doesn’t need its own power supply since the supply is provided by the current loop receiver. Thermocouple is basically a junction of two different metallic material that measures the temperature difference. This …

5V Powered 4-20mA Current Loop Generator

Voltage step-up also employed in figure below, but for a different purpose. The common requirements are transmission of industry standard 4-20mA current loop signals to valves and other actuators.   Current transmitters is required by resistive line losses and actuator impedance to be able to force a compliance voltage of at least 20V. 5V powered …

Programmable Current Source/Regulator

This is a simple circuit of programmable current source/regulator. This circuit is used to generate current. Here is the schematic diagram of programmable current source/regulator : This circuit uses L 200 as main component. The error amplifier of this circuit is disabled by shorting pin 4 to ground. The value R is used to fix …

Computer-Controlled 4-20mA Current Loop

Computer-controlled 4-20mA current loop is useful to control some industrial equipments.  By current loop, transmitting the signal over long distant should be resistant from noise interference. This  computer-controlled 4 – 20mA is designed to operate on a single supply over a range of 3.3V to 30V.  The zero reference of 4 mA is set by …

Single Chip Thermocouple 4-20mA Current Loop Transmiter Circuit

Thermocouples give many benefits compared to thermistor/RTD (Resistance Temperature Devices).  Some advantages of thermocouple are their wider temperature range, their reliability, and their consistency over long period of time. In some cases,  thermocouple calibration  is even unnecessary. Thermocouple temperature sensors are widely used in temperature controllers for boilers, oven,  pressurized reactor, even in high temperature …