Connect 3 wire sensor in correct way NI 9209

Hello

I have several sensors of absolute pressure with only three wires (a common thread, an excitement + and signal output +). I enclose the form in pdf format. I need to connect about 6 of these sensors to my NI9209 card inside a cDAQ chassis. I also have a power supply of 24 VDC. I would like to ask about the proper connection if I want to use the differential voltage measurement.

Can I just wire the elements in the following way (left photo), or do I have to follow the recommended wiring as described in the manual on page 14, the part 'floating differential connections' ( http://www.ni.com/pdf/manuals/376909c.pdf ), right? Thank you!

Edit:

If I have to use the resistance of 1 MOhm, is it enough to use a single resistor connected between the pin of the NI of COM map and all the pressure sensors COM ports?

You need to have the input of COM on the module HAVE referenced in your municipality.  However, if all your sensors are out of the ordinary even running, you need not the resistance of 1 M.  The only reason why neither mentions that this connection is for incoming signals not referenced to the commune.  Given that this sensor is only to give you a single output is completed, it would be much easier to just run the signal is broadcast to the module I and connect the COM to the power supply.  Otherwise, you basically jump the COM signal toward the low side of each measure and the reference measurement to COM in any case.

Tags: NI Software

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