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4-20mA to 496-2480mV


Makada Sep 27, 2020 12:15 PM

Hi all,

I would like to see if my multiplier and offset from the windspeed sensor is set the right way. 

The sensors output is is 4-20mA, but with a resistor of 124 ohm it is now 496mV - 2480mV.

The sensors range is 0 - 50 m/s

VoltDiff(WS_KPH,1,mV2500,1,True,0,250,0.001,0)

With kind regards.


JDavis Sep 28, 2020 08:19 AM

Since the sensor has a linear output, this is how you would calculate the multiplier and offset:

2480 mV = 50 m/s

496 mV = 0 m/s

Multiplier  (50 m/s - 0 m/s)/(2480 mV - 496 mV) = 50/1984 = 0.02520161 m/s / mV

Offset = 496 mv * 0.02520161 m/s / mV = 1.26 m/s


Makada Sep 28, 2020 10:45 AM

Hi JDavis,

Thanks alot for your input.

The offset outcome of 1.26 is that right?

With kind regards. 


GeodeNZ Sep 28, 2020 04:53 PM

 

 VoltDiff(WS_MS,1,mV2500,1,True,0,250,1,0)
WS_MS = (WS_MS-496)*0.02520161
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