Can those hardware used in a high pressure condition？

[j1204]

hello everyone!

I have a test project that i must measure something  in a  high pressure and full of  gaseous refrigerant .(the pressure is about 3MPa,the refrigerant is R290（propane）or R134a)，

Can i use those hardware to measure in that condition？

list:  CDAQ-9178\NI9222\NI9205\NI9213\NI9401

[j1204]

and the temperature is about 30℃.

[chuggins1434]

...it would be nice to know what you are trying to measure!  Volts, amps, speed, RPM, light intensity, time, etc.??? 

[j1204]

We try to measure a hermetic compressor which used for air condition，the pressure 、temperature、speed of motor and the displacement of the valve.

[chuggins1434]

Each measurement will need some way to send the signal through the pressure vessel wall...

Pressure, obviously this will require a pressure transducer of some sort and a port to measure said pressure.

Temp, depending on what type of sensor you're using will depend on what type of penetration you'll need in the housing and how you'd measure it.

Motor speed, also will depend on how you want to measure it.  I'd consider using some kind of inductive pickup on a rotating part.  (hall effect sensor or some such) if available.  If not, can you measure directly?

Valve displacement.  What are you needing to measure... acutal displacement or just  whether it's open or not?

Lots of things to consider. 

Chad

[j1204]

thanks very much！

Actually  we used some sensors （like：ICP pressure sensors T thermocouple and  so on）to measure. But we used to much sensors，we must use many

Sealing terminals（about 7 ），so we want use a NI 9178，mount it in the shell which full of Refrigerant R290, that we can only use two Sealing terminals，one for power supply （220V~50Hz） other  for  date transfer（USB2.0）. But we aren‘t sure NI 9178 can work in that condition.

NI 9222  for pressure and Valve displacement.

NI 9411  for Motor speed

NI 9213  for Temp.

[chuggins1434]

Ah!  Ok, then that is a question for NI about their hardware.  I would probably be less worried about the pressure and the refrigerant than I would be about the oil used in the system.  If it was an old system that used mineral oil for lubrication then I'd be inclined to say go for it, but I don't know how the new oils would react with circuit boards and such.  Now if you could isolate the unit above and away from the actual moving parts, say in another pressurized vessel with the wires running through filters to keep the oil out, but still connected by a tube to run the cables through to get to what you want to measure... again, I wouldn't see a problem with trying that.  ...if you're limited on penetrations, then you might want to transmit the data wirelessly.  I'm thinking an Arduino talking to the sensors and transmitting via xBee to a computer logging the data.  This also might have limitations depending on how much data you're wanting to send.  Anyway, I'm curious as to how it turns out!  Keep us informed!  🙂 

Good luck!

Chad

[j1204]

we  want to try like  waht  you said : in another pressurized vessel with the wires running through filters to keep the oil out, but still connected by a tube to run the cables through to get to what you want to measure.   but It a big risk for our to try，if the cards broken our boss will fire me，so i want to acquire the information form NI.

I'm form china and my english is very poor ，can you understand？ thanks