Pressure.VI help


Im a student working to the test with the polymer PDMS under pressure. I hope you can help me with a little problem I have met. I use a Honeywell P40 series pressure sensor connected in a 6218 USB of NOR. It is a program to measure the pressure with an inside diameter of the hose included, average of 1.2 mm is the for the 40PC honeywell series user manual:

I have connected 1 pin 2 on the pressure sensor to pin 19 and 20 respectively pin on the NI USB 6218 case. I have not connected pin 3 No PIN pressure probe of the OR usb-6218. This will effect? Should I connect it on a spit of land and if so is it important that we?

I have the program VI in labview 9 but still can't get used to it as I'm accustomed to Labview 7. I will include the program in the email and you would appreciate it if you took a glance and could let me know how I would use it or if the program is terminated.
Thank you very much
John Stewart 3rd year mechanical engineering.

Hiya John,

The link you sent me on the pressure sensor, in "General information", it is said;

"The analog output of 0.5 v to 4.5 v is linearly proportional to the inlet pressure.

In other words if the voltage measured at the output that you read is from 0.5 v to atmospheric pressure (101KPa), the measurable maximum output pressure will report to a pressure of 909KPa, for example if the boost value K is equal to 1. (unless it is inversely proportional, where when the pressure drops the voltage increases). But you need to calibrate your sensor to determine the boost value K.

For calibration what is the measured voltage to output for a known input pressure is proven and you can then use some simple mathematics, know the boost value K.

IE (0.5V / (101KPa)) = K (Vout / (known to pressure))

But if you have any additional doubts on this I do not know that a call to specialists of Honeywell would not go a miss...


Ben Hartrick

Tags: NI Software

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