Need help with pressure transducers

[jdvaughn]

Hi Guys,
I am currently working on building a flow bench for our VT Formula Dersign team. I am in need of help in regards to finding the necessary pressure transducers. I am hoping to find a differential pressure transducer that will work with both positive pressure and vacuum. I am also looking for a sensor that does not connect to a circuit board (i.e. PCB termination) I was hoping to find a transducer that has a cable connection to the transducer. Let me know what you guys have in mind! Thanks.

[49-1183904562]

Jd,

What is a "VT Formula Dersign team" ?

And what would you like this cable to output?

Rick

[jdvaughn]

The VT formula Design team is a team of JR and Sr Engineering students who design and build a formula race car from the gound up and then compete against other universities, in a nutshell. I was hoping to just have three wires in the cable: negative excitation, positive excitation, and signal. I was hoping for a self-conditioned sensor so it wouldnt need to be amplified to be a clean 0-10V signal. Thanks for the help!

[bruce]

[jdvaughn]

I am currently looking at this differential pressure transducer



The reason being is that I have a 5V output from my daq system as well as it gives an amplifies output from .25 to 4.25V
I was wondering what differential pressure range you think would be useful. I was going to look at the +/- 15 psid sensor to allow for room of use. I believe tha the accuracy should still be the same, but maybe I should get the +/- 5psid transducer for even better accuracy and resolution since the diff pressure is usually so small? Would this be sufficient for high pressure exhaust and intake tests? I want to make sure I get a sensor that works well as well as covers the full range of what I need. I believe by getting a sensor that is +/- 5 psid I wouldnt have to worry about switching around the connections when going from intak to exhaust. Let me know what you think, as I am trying to order these Wednesday. Thanks.

[86rocco1]

Differential pressure range of 1 psi would be adequate for most flowbench applications. Here's a much more affordable sensor you might consider, it's a 10kPa sensor (about 1.45 psi), it operates on 5V supply and has output range of 0-4.7V. The most significant difference between this sensor and the Omega sensor besides pressure range is that this sensor only measures positive pressure differentials so if you need to means negative ones, you would need to have some type of switching mechanism.

[86rocco1]

I did a little more looking around, the Freescale MPXV70XX series of sensor is another you might consider. They're similar to the MPX50xx series except that the 7000 series accepts positive and negative pressures, the sensors most suitable for flowbench use are the 7kPa and 25 kPa units.