How can I convert Voltage values?

[KRAZE4LV]

Since my DAQ board is voltage type NI 6251, i want to calculate the pressure(bar), Temperature(deg C) and Level9m).

How can convet the voltage values from the sensor acquisition to actual Engineering values?

[KRAZE4LV]

*level (m)

Any link for the farmulaes/Equation?

[RavensFan]

Basic math.

Take a look at this thread where there was a similar question and I posted a subVI that encapsulates the calculations.

It is also possible to do the scaling inside of the task by setting up the properties for the channel inside MAX.

[KRAZE4LV]

Thanks

Actually i also read that as per the linear presssensors we can scale them with Y =mX+C but what is M and C how can I calculate it?

How can I calculate Temperature from Voltage?

[KRAZE4LV]

Pressure transmitter with 4mA to 20mA, 1 to 5V can read -1 to 10 bar values

[Coq_Rouge]

I am sure you have had this in school but perhaps forgotten it. Or you do not see the link to practical use.

Take a look here.

http://www.hyper-ad.com/tutoring/math/algebra/linear%20functions%20and%20straight%20lines.html

[KRAZE4LV]

Thanks for reminding me the equations.

I am still struggling for conversion of Voltage to Temperature conversion, I am using RTD sensor, Pt100ohm and Voltage conversion to Level (meter), I am using wire type sensor for tank level.

[johnsold]

Do you have the alpha value for your RTD? Are you exciting it with constant current or in a voltage divider or bridge configuration? Do you have a formula for the resistance as a function of temperature (usually found in the manufacturer's literature)?

Lynn

[RavensFan]

Look in the Numeric >> Scaling palette.  There is a function called Convert RTD.

[KRAZE4LV]

Thanks!

I have another question,

while taking pressure measurement, I have well grounded the AI wires and secondly I also put RSE in the create channel.

But still the pressure values keep fluctuating rapidly, I am unable to recieve a stable value.

How can rectify it?