Agilent Gain/Offset for Pressure Transducer

[fifty60]

I have a couple Kavlico P528 pressure transducers that I am trying to observe with Agilent data logger using BenchLink 3.

The P528 has a pressure measuring range of 0 to 400 PSIA. The Nominal Output voltage is .5VDC to 4.5VDC. I am trying to calculate the m and the B in the equation Y=mX+B.

Having the output voltage offset confuses me. I was thinking that I just shift the entire X axis over by .5, so that zero on the X axis is actually .5VDC. Doing this, I get a voltage span of 4VDC. 400PSIA/4 equals a slope of 100.

This is not giving me the correct measurements. I have tried using 80 (which is 400/5) but still not correct. Any help is appreciated.

 

[petersonra]

I have a couple Kavlico P528 pressure transducers that I am trying to observe with Agilent data logger using BenchLink 3.

The P528 has a pressure measuring range of 0 to 400 PSIA. The Nominal Output voltage is .5VDC to 4.5VDC. I am trying to calculate the m and the B in the equation Y=mX+B.

Having the output voltage offset confuses me. I was thinking that I just shift the entire X axis over by .5, so that zero on the X axis is actually .5VDC. Doing this, I get a voltage span of 4VDC. 400PSIA/4 equals a slope of 100.

This is not giving me the correct measurements. I have tried using 80 (which is 400/5) but still not correct. Any help is appreciated.

m=100
b=-50

 

[Smart $]

m=100
b=-50

To elaborate on that, "B" is in output units (same as Y or psia), not input units (X = volts). "m" is the conversion factor: psia/volts. Units on both sides of the equation must cancel out.

Y_PSIA = m_PSIA/V ? X_VOLTS + B_PSIA

 

[fifty60]

Very helpful, thanks, it makes sense.