4-20mA to 0-10v voltage, this is I/V conversion. That is current-voltage conversion, usually used for long-distance signal transmission in the industry.

How to convert a 4-20mA to 0-10V /1-5V signal?

There are two methods: one is to do it yourself with an operational amplifier. The other is to buy ready-made products, such as a 4-20MA/0-10V current-to-voltage isolation converter.

How to convert a 4-20mA to 0-10V /1-5V signal?

4-20mA is the standard output of our measuring instrument. Such as pressure transmitter, temperature transmitter, flow meter, liquid level transmitter, and so on.

In the field of industrial measurement and control, we often encounter the following problems:

How to convert 0-5V to 4-20mA, 0-20mA or 4-24mA?

How to convert 0-10V to 4-20mA, 0-20mA or 4-24mA?

How to transform ±5V, ±10V AC voltage signal into 4-20mA, 0-20mA, or 4-24mA DC current signal?

4-20mA means that the minimum current is 4mA and the maximum current is 20mA.

The industry generally needs to measure various non-electrical physical quantities, such as temperature, pressure, speed, angle, etc. They all need to be converted into analog electrical signals before they can be transmitted to the control room or display equipment hundreds of meters away. This device that converts physical quantities into electrical signals is called a transmitter. The most widely used in the industry is to use a 4-20mA current to transmit analog quantities.

4-20mA

  • The general input impedance of 4-20mA is 250-300 ohm, which is not easy to have interfered. But maintenance measurement is more troublesome;
  • 4-20ma DC signal can provide power. In addition, it is not affected by the load size within a certain range, and has strong anti-interference ability.
  • 4-20mA can realize two-wire transmission, saving wires.
  • The current signal is suitable for long-distance transmission, but the current signal has weak anti-interference ability, and shielded wires are generally used.

0-10V

  • 0-10v are generally high-impedance inputs and are susceptible to interference. But maintenance, measurement and calculation are all very convenient.
  • 0-10V, is active, three-wire system, or four-wire system.
  • The voltage signal is stable and anti-interference is strong, but it is not suitable for long-distance transmission (with voltage drop);

The 4~20ma signal is the sensor transmission signal commonly used in industrial transmitters. It does not have a fixed-line voltage. The current is constant during transmission and the voltage changes with the load.

For our measurement and control instruments, it depends on whether your instrument wiring is a four-wire system or a two-wire system.

The four-wire system may be AC220V or DC24V;
Two-wire system or three-wire system, generally DC24V.

4-20mA standard signal conversion

Common standard analog signals are: 0-5V, 0-10V, ±5V, ±10V, 4-20mA, 0-20mA or 4-24mA. Common transmitters or sensors use one or more of the above formats to output standard signals.

Common secondary meters or acquisition cards generally accept input signals of one or more of the above formats.

When the output signal of the transmitter or sensor is different from the input signal format of the secondary instrument or acquisition card, we need to add a converter between them.

Because the 4-20mA standard signal has the advantages of strong anti-interference ability and no attenuation in the transmission process, it has been widely used in the field of measurement and control.

Often in order to achieve interface compatibility or improve electromagnetic compatibility, it is necessary to convert 0-5V, 0-10V and other standard voltage signals into 4-20mA standard current signals. Or the 4-20mA current signal needs to be converted into a 0-5V or 0-10V standard voltage signal suitable for the input of the acquisition card.

How to convert a 4-20mA to 0-10V /1-5V signal?

I have a pressure transmitter here that outputs a current of 4-20mA. As the input signal of the inverter. Now it is required to change the input signal of the inverter to a voltage signal. That is, the current of 4-20mA should be replaced with a voltage of 0-5V or 0-10V. The inverter has two inputs: 0-5V and 0-10V. Excuse me, how can it be transformed?

Answer: There are two schemes to achieve:

1.Use a hardware circuit to convert the input 4-20mA current signal into 0-5V or 0-10V voltage signal. See the circuit diagram below:

 4-20mA current signal into 0-5V or 0-10V voltage signal

Connection:

  1. Select the A input port: connect A+ and RA together, connect an external 4-20mA current input signal, and connect the A- terminal to the PLC common point M. A input port is set to 0~20mA current input mode.
  2. The analog output port uses voltage output port V0, its M0 port is connected to the common terminal M, and the output port is set to voltage output mode: 0~10V (or 0~5V).

2.Use a signal converter

The signal converter converts the DC current or voltage signals of various devices on the site into the required DC signals for isolation and transmission and then outputs them to other instruments. The signal isolator can effectively eliminate ground return. Solve the problems of industrial field interference and signal conversion, transmission, and matching.

It is widely used in data acquisition, signal transmission and conversion, PLC, DCS, and other industrial measurement and control systems in electrical, power, telecommunications, steel, petrochemical, sewage treatment, environmental protection engineering, aerospace, building automation, and other fields. It is used to complete and supplement the system simulation I/O plug-in function. Increase
The applicability of the system and the reliability of the on-site environment.

Main Specifications

  • Measurement: DC current, DC voltage, etc.
  • Accuracy: ≤±0.1% F·S
  • Power consumption: <1W (when 24VDC power supply)
  • Impedance: current input ≤100Ω, voltage input ≥500KΩ
  • Power supply: DC24V, AC220V or customized
  • Isolation: Input, output, and power supply are completely isolated
  • Support live hot swap operation. Easy to unload, high precision, high linearity, strong anti-interference
  • Long-term work stability
Input signalEnter parameter codeOutput 1Output 2Power supply
A DC power supply
V DC voltage
Current Range
A420 4-20mA
A020 0-20mA
A010 0-10mA
T customer self-determined;

Or voltage range
V0100-10V
V15 1-5V
V075 0-75mV
V6
0-600V
T customer self-determined
V010 0-10V
V15 1-5V
A4204-20mA
A0100-10mA
T customer self-determined
V0100-10V
V151-5V
A420 4-20mA
A0100-10mA
T customer self-determined
No input
D DC24V
A AC220V
T customer self-determined

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