Connect 24V 2wire sensor to 5v Logic

[Dimitrios Mitsas]

Hello all and thank you for reading me. As the tittle suggests I have a pressure sensor from SMC that works on 24V and it's a 2 wire one (brown blue) I did read the manual and I was able to use a 3 wire sensor at 24V using a voltage divider. But I can't really figure out how to connect this sensor on one of the pins of my micro-controller (5V logic I mentioned). I did search mister Google a lot but the only thing I found are pictures having the sensor connected in parallel with the power supply and a "magic" load in series. Any help is appreciated.

 

[BobK]

Link to the datasheet?

Bob

 

[Dimitrios Mitsas]

Thank you very much for the reply.
https://www.smc.eu/smc/Net/EMC_DDBB/ce_documentation/data/attachments/IMM_PS1x00_TFR30EN.pdf

 

[BobK]

Sorry, I don't have any experience with that kind of sensor. That said, I think you could put a voltage divider from the brown to the blue wires, using resistors >> the series resistor, which should be set to something like 1K. So maybe:

brown -> 10K <--> 2.5K -> blue

Then take the signal from the joint of the two resistors.

This would provide approximately 4.8V when then switch is OFF and 0V when the switch is ON.

Bob

 

[Bluejets]

You could connect through an optoisolator as shown in the data sheet for PLC connection.
Adapt to suit your application.

 

[Minder]

That appears to be a 2 wire sensor and requires the voltage from the load of the sensor to also power itself.
As opposed to the 3 wire type that use +/- & out.
It also appears to be a level switch as opposed to a linear output which Would require the 3 terminal type.
They are intended for relatively high impedance inputs.
I assume you want to interface with a MicroProcessor?
You could use an Opto as shown in the data sheet.
M.

 

[Dimitrios Mitsas]

Thank you all very much for the replies. I will first try with a voltage divider like bob suggested and then with an optoisolator. Thanks again.