4-20mA output for variable relay.

Other Hardware Motors, Mechanics, Power and CNC
1

I've been searching for an answer to a (simple) question.

I need to control a variable solid state relay with 4-20mA output (this type: KYTECH ELECTRONICS, LTD)

How do I do this with an arduino board?

2

I assume you want to read a variable signal from the sensor and then switch the SSR on or off.

The 4 - 20mA output needs to be fed into a precision 250 ohm resistor to develop a voltage that is then read by an analogue input. Make sure thr R is not more than 250 ohms or you risk damage to the input.

Read the input and then control the SSR as required.

Weedpharma

3

The 4-20mA is for the input (control) of this device:
The analog switching relay works in accordance with the phase angle control principle, i.e. the output switching point in the AC sine wave depends on the control current. 4mA corresponds to no switching and 20mA corresponds to full sine wave (near line-ar power response). The relay switches off every time the output current crosses zero, and switches ON in accordance with the applied control current

4

I misread the question!!

Weedpharma

5

Here's one idea.

LM358_volt-amp.jpg