How to wire a 2 wire loop pressure transducer to NI 9949 RJ-50

[Big-Dog]

I am new to NI and data logging.

I want to connect a 4/20mA, 2 wire loop-powered pressure transducer to an NI 9949 RJ-50 screw terminal ... which will then connect to an NI 9237 input module.

The NI 9237 module is installed into an NI compact DAQ 9174 chassis.

I will be measuring truck air brake system air pressures from Zero kPa (gauge) up to an allowance of 1000 kPa (gauge).

The 2 wires on the transducer are identified as:  + Power and + signal

I would appreciate advice on the correct terminals on the NI 9949 RJ-50 please

[cody_a · Accepted solution]

Unfortunately, it looks like you have the wrong module for this task.  The 9237 is used for measuring the output of bridge based sensors (such as a strain gauge).  The signals it is designed to measure are fundamentally different than the 4-20mA signal your pressure transducer outputs.

Take a look at the NI 9203, 9207 or 9208.  All have at least some channels designed to take a 4-20mA current input.  Then, give the team at NI a call (877-387-0015) to talk through your application and verify you're selecting the right hardware for what you want to do.

[Big-Dog]

Hi Cody,

I'm glad that I checked before I puchased the transducer.

I know that there are 3 Honeywell TEDS pressure transducers that will match up to the NI system, however I was a bit shocked by the price.

I will search around for suitable bridge based pressure transducers.

Failing that, I will look into the purchase of another NI module.

Many thanks for your prompt reply to my question.