Deze configuratie software kunt u gratis downloaden van onze website. The xtr112 and xtr114 operate on loop power supply voltages down to 7. Galvanically isolated active output 420 ma or 010 v. Troubleshooting a 420ma current loop instrumentation tools.
Analog circuits training how voltage dividers work and calculating resistor values. A twowire transmitter with controller power and a 420 ma input. A typical 420ma current loop setup contains 3 things power supply most of the devices work at 24v dc but there are other voltage standards available as well420ma current loop sensor this is the device which works as 420ma standard. This is the device used to transmit data from a sensor over the twowire current loop. The analog to digital converter will be used to convert the voltage into digital signal which is used to indicate the process variable value in the dcs plc hmi. If using selfsupplying sensors the minimal loop voltage required is 6,5 volts. As major as the 420 ma loop standard has become in the process control industry, many.
Introduction to the twowire transmitter and the 420ma. Data sheet vegadis 82 4 20 mahart external display and. Wiring a potentiometer to a meter basic voltage circuit. The transmitter controls the current through the loop. It works without auxiliary operating voltage by taking its own energy from the input current loop. The 420ma current will be converted into standard 1 5 v dc using a precision 250 ohms resistor. Xtr116 data sheet, product information and support. These components are all it takes to complete a 4 20 ma current loop.
Optimized circuit design for hart enabled 4 ma to 20 ma inputs. The xtr117 is a precision current output converter designed to transmit analog 4 20ma signals over an industrystandard current loop. The instrument is looped directly into the signal line at. The sensor measures a process variable, the transmitter translates that measurement into a current signal, the signal travels through a wire loop to a receiver, and the receiver displays or performs an action with that signal. It receives output current 420ma from transmitter and convert into a voltage 0. Analog circuits training analog 420ma current circuit types 2 wire and 4 wire current source. Analog current loop simulator and tester 420ma circuit.
Back then, if i needed to convert current to voltage id use any solution based integrated circuit ic to get the job done quickly. Analog circuits training lessons on 420ma, 010vdc, and. Before i started setting up my small contract manufacturing business i was a pure electronics designer. The current loop simulator was developed to assist maintenance personnel and integrators in 4 to 20 ma analog input testing, troubleshooting and application development. The design includes a protection circuit that provides immunity to the iec64 test suite. Optimized circuit design for hart enabled 4 ma to 20 ma. In order to understand what a 420 ma direct current dc loop is and how it works, we will need to know a little bit of math. Then through the ad converter sends signal to main board microcontroller. The basic layout of every 4 20ma loop consists of a power supply, a transmitter, and passive loop devices. Simple and effective 420ma current loop receiver with minimal components. The loop devices provide feedback to the world, whether it is an indicator displaying the measured quantity from the transmitter, or some type of relay output control device.374 639 274 124 871 994 1166 455 1073 729 1298 1075 811 1480 798 1384 284 908 785 307 283 964 817 376 35 1203 850 108 505 558 852 522 1152 460 942 344 856 532 1286 621 1075 340