Need help communicating LabVIEW with Rosemount 3051S pressure transmiters (with HART protocol)

[Ginger6]

Hello,

We just got some Rosemount 3051S pressure transducers that work with the HART protocol, since I've never worked with any of these "smart devices" before, I don't know how to get the pressure data collected in LabVIEW. When we received the transducers, they came with only the transducers, no power adapters and other cables were provided, what I tried to do was: I bought the 24VDC power adapters and put some 250 ohm resistors in the loop so I can convert the 4-20 mA signal to 1-5 VDC votage signal, but for some reasons the voltage signal was fluctuating randomly, the error is way too big to be used. I came across this forum when searching for a new solution, I read some posts in similar problems but due to my limited knowledge in EE, I still couldn't get a clear image :(, I wish you gurus could tell me what hardware and/or software do I need to make this work.

Thank you in advance!

H.J.

[Ginger6]

Basicly I just want to be able to collect the signal with a NI DAQ, it seems like if I don't put the resistor, then the HART function won't even work, so does that mean I can just use the 4-20 mA analog signal to calibrate the transmiters? then I just need a current DAQ from NI...

[JustinP]

Hello, 

There is this example on using HART protocol with LabVIEW.  If the output of the transducer is 4-20 mA and is linear with the pressure then you can calibrate the transducer and use an current input device.   

Thank you, 

Justin 

[RobertoLabView]

Hi H.J.!

I've been facing a similar problem.

I have in my instrument a Rosemount3051cd transducer and IoTech Personal Daq55 board, connected to an USB cable.

I'm planning to build the same circuit like yours to convert the current to volt.
You mentioned a fluctuation in the volt signal. Did you solve it?

Do you suggest me to build the circuit to solve the problem?

Thanks a lot in advance.

Best regards,

Roberto