Configure input channel with sensor calibration

[Mariana Perez]

Hello, I'm measuring pressure using a 26PCAFA6D pressure sensor with a range of +/- 1psi and output voltage of 17mV. I've calibrated the sensor and obtained an equation: V = -2.8457P -0.4833 using a DT9828. The software I'm using is QuickDaq and for the voltage channel configuration, I was wondering what should I put in the fields: mV/EU and EUoffset.    

[JRys]

Hello,

Assuming an output is  0 - 1 psi and 0 - 17 mV signal, the mV/EU would be 17. However, the output is -1 to +1 psi, so 0 volts is -1 psi. In this case, the mV/EU is 8.5 (half of 17) and the offset is -1psi. How did you come up with V = -2.8457P -0.4833?

Best regards,

John

[Mariana Perez]

Thank you for your answer. 

I came up with the equation using a set up that I have for which I know the pressure difference it should measure. In the equation provided P is in kPa and V in mV.

The sensor also outputs negative voltage.

Best regards,

Mariana 

[JRys]

1 psi = 6.895 kpa and 16.7 / 6.895 = 2.42 mV/EU. When using 2.42 and +/- 16.7mV I get +/- 6.895 kpa. Your values differ slightly because you're using the numbers from the calibration sheet.

[Mariana Perez]

Thank you for your help!