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Transforming a 2 wire Current Loop into a Voltage Output Signal

If you are running a signal cable over a long distance or have a spare current output pressure transmitter, it is possible to convert the output signal to a voltage type to make it compatible with voltage only input devices.

A typical current output is 2 wire 4 to 20 mA which is designed to be connected in a series with the power supply and other components included in the circuit. The pressure transmitter acts as a current source regulating the current at a particular pressure for a range of load impedances as long as there is sufficient supply voltage to power it.

If a load resistor is added to the circuit in series this will cause a voltage drop across the resistor which is directly proportional to the current being generated by the pressure transmitter. The potential of this voltage drop can be easily measured by connecting two voltmeter probes or an analog to digital converter to the circuit on either side of the resistor.

4-20mA current signal related products
  • High Temperature Pressure Transmitters
  • DS200P Sanitary Low Range Pressure Gauge, Switch and Sensor
  • Vacuum Pressure Transmitters
  • Differential Pressure Transmitters

The voltage output generated by different values of load resistance on 4 to 20mA current loop are as follows:

Load Resistor (Ω) Min Volts Max Volts
50 0.2 1
100 0.4 2
150 0.6 3
200 0.8 4
250 1.0 5
300 1.2 6
350 1.4 7
400 1.6 8
450 1.8 9
500 2.0 10
550 2.2 11
600 2.4 12
650 2.6 13
700 2.8 14
750 3.0 15
800 3.2 16
850 3.4 17
900 3.6 18
950 3.8 19
1000 4.0 20
Voltage signal related products
  • AS Autosport Pressure Transducer Ratiometric 0.5-4.5 Volts Output Pressure Transducers
  • IWR-5 Five Channel Wireless Sensor to 4-20mA or 1-5Vdc Output Signal Receiver
  • Analog Output Pressure Gauges
  • Steam Pressure Transducers

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Wirelessly Measure & Log 4-20mA

Use this battery powered wireless 4-20mA wireless transmitter to transmit readings to a receiver connected to USB, RS485, RS232, cellular network or analog output

Use this battery powered 4-20mA wireless transmitter to transmit readings to a receiver connected to USB, RS485, RS232, cellular network or analog output

Help Guides

  • Measuring negative pressure using a positive differential pressure range
  • Pressure Sensor Accuracy Specifications
  • Process Connections
  • Determining calibration error of Bourdon tube pressure gauge
  • Measurement Accuracy
  • Supply voltage and load resistance considerations for pressure transmitters
  • Measuring vacuum with negative gauge or absolute ranges
  • What is the difference between gauge and absolute pressure measurement
  • Measuring the difference in air pressure between rooms
  • How to Connect a 4-20mA Current Loop Pressure Transmitter
  • Advantages and Disadvantages of using a 4 to 20 mA Signal
  • Determining water tank volume using hydrostatic pressure
  • How do you measure the volume of a liquid using pressure
  • What is the difference between vacuum and absolute pressure
  • What does negative and positive gauge pressure mean

Featured Product Types

  • Differential Pressure Transmitters
  • 0-5 Volts Output Pressure Transducers
  • Water Level Transmitters with 4-20mA Output
  • RS485 Serial Interface Pressure Sensors
  • ATEX Approved Liquid Level Sensors for Hazardous Areas
  • 4-20mA Output Hydrostatic Level Transmitters & Sensors

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