4-20ma to 0-10v converter circuit diagram

4 20ma to 0 10v converter circuit diagram full#
4 20ma to 0 10v converter circuit diagram professional#

If the leakage is too high, you can also protect with a diode from that junction back to the 3.3V supply voltage. In that case you want to be sure the zener doesn't leak too much at 3V (or whatever your maximum signal is). If you put a 3.3V or 3.6V zener on the junction of the resistive divider your device will be protected, but any current coming in will be clamped. On a too high input you will load the device generating the voltage a lot, possibly damaging it and if you apply 12V or 24V supply, your zener will probably just blow up. I would not put the zener diode directly on the input. The diode will cost you 0.7V here, you can also use a Schottky diode with a very low forward voltage, like the BAT54 types, they will leak a bit more in reverse, but even 1mA will only generate 15mV in reverse across the op-amp, which should be damage free. Of course, with 5V coming in from a mis-connection the resistor will likely clamp or burn-up.

4 20ma to 0 10v converter circuit diagram full#

And if you want to be 100% sure the op-amp is also safe, add a zener diode there too, if you have a 3.3V or 5.6V type they won't leak all too much at the 0.3V for maximum current in the loop, but still offer full protection to a 24V powered op-amp. You can also add a capacitor of 10nF or so on the output of the Op-Amp here for filtering. Simulate this circuit вЂ“ Schematic created using CircuitLab You may also want to add a resistor to the op-amp's output and a clamping diode, in case a connection mistake introduces more signal than what you expect, as well as protections for reverse connections: You can reduce the resistor to 15 Ohm and have the op-amp amplify the signal by a factor of 10 to get the same effect.

4 20ma to 0 10v converter circuit diagram professional#

With some of those devices, and possibly even some professional ones, you can probably not be sure they can cleanly generate the full current range with voltage drops up to 3V. internet-open-source-type device, you may want to reduce the resistor. The accuracy of this circuit is better than 1% across the operating range, that can be done by compensating for the dominant error.Since the standard is intended to work with relatively large wire and connection losses, in your situation the resistor you chose may well work, but if you mean to use this with more. However, the performance with unmatched components was better than 1% at full-scale. The worst-case output error is 5% based on Monte Carlo analysis. Using 1% resistors, this circuit will perform well. Beside that, IC2 comparator can be used to flag a pre-set loop current or monitor input voltage. An output range of 0.05V to 5.045V is generated by IC2 that is configured as unity-gain difference amplifier. Using the resistor values shown (R2-R6), the output of IC at pin 8 is approximately 6.25V at 20mA and 1.25V at 4mA. To generate a ground-referenced output that ranges from 0V at 4mA to 5V at the full-scale loop current (20mA), a reference/op-amp/comparator device (IC2) is employed.

In this circuit, a current-sense amplifier (IC1) is used to monitor the loop current. It is ideal conversion to digital with an analog-to-digital converter (ADC). This is a simple circuit that can be used to convert a 4-20mA signal to a 0V to 5V analog voltage.

4-20ma to 0-10v converter circuit diagram