| Title |
Development of a Transducer Converting Various Industrial Standard Sensor Outputs to 4∼20mA by Digital Control) |
| DOI |
https://doi.org/10.5573/ieie.2020.57.2.91 |
| Keywords |
Transducer ; Industrial standard sensor ; 4-20mA output ; Digital control ; Instrumentation system ; |
| Abstract |
New digitally controllable transducers to convert output signals for industry standard sensor module to 4∼20mA was designed. The transducer consists of a digitally controllable voltage-to-current transducer(VIC), a 4mA reference current, and a current amplifier. The VIC used six analog switches, six weight resistors, and constant voltages of 1.0V, -5.0V, and -10.0V to select industry standard sensor signals. Simulation results show that the transducer's output current is 4 to 20 mA when the industry standard sensor module signals are 1 to 5V, 0 to 5V, -10 to +10V, -5 to +5V, and 0 to 20mA, respectively. The nonlinearity error of the output current for the input signals is less than 0.1%. The output current was measured in voltage using a load resistor of 250Ω and the voltage output for each industry standard sensor was 1 to 5V. The same results were obtained by measuring the proposed transducer as a prototype. |