![]() Simply insert these values in your data acquisition software where prompted and your readings will now be acquired in PSI instead of Volts. 5 volts out should give us 500PSI and 1 volt out should give us 0 PSI. To test that the values are correct, put them in the equation. We calculated a value of 125 PSI/Volt, therefore, 1V = -125) If the output of the sensor was 0-5Vdc, then there would be no offset. M = 125 (use divide the Units by the Voltage or Current - 0-500/1-5 = 125) which results in PSI/Voltsī = -125 ( since the output starts at 1 volt, there is an offset. 3) Convert the ADC Value to equivalent temparature. Formula to convert voltage to temperature. If it was a 0-10Vdc output, X would be 10) Steps to calculate temperature using LM35 temperature sensor. Here is a typical example where a pressure sensor is used to measure 0-500 PSI and the output is 1-5Vdc.įirst, using the Y=MX+B formula, we determine what each value is in order to calculate for Y. Where X is the INPUT (millivolts, volts, etc) and Where Y is the output or ENGINEERING UNITS It is very simple to scale any sensor, and the same equation applies to all methods of data display and acquisition. Other examples would be using a pressure transducer to measure PSI, a flow sensor to measure GPM and a relative humidity sensor to measure RH units. For example, if measuring force using a load cell, it would be much more beneficial to the user if they could read and record the data in LBS (pounds) instead of millivolts, which is what the load cell typically produces. ![]() It is very often necessary to convert a voltage, millivot or current reading into a more useful value such as PSI, GPM, LBS, etc. ![]() Scaling Voltage & Current to Engineering Units Converting Current and Voltage Inputs To Engineering Units Such As PSI, GPM and LBS
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