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From Friday, April 19th (11:00 PM CDT) through Saturday, April 20th (2:00 PM CDT), 2024, ni.com will undergo system upgrades that may result in temporary service interruption.
We appreciate your patience as we improve our online experience.
05-19-2011 09:58 PM
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?
05-19-2011 09:59 PM
*level (m)
Any link for the farmulaes/Equation?
05-19-2011 10:02 PM - edited 05-19-2011 10:05 PM
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.
05-20-2011 05:18 AM
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?
05-20-2011 05:37 AM
Pressure transmitter with 4mA to 20mA, 1 to 5V can read -1 to 10 bar values
05-20-2011 06:30 AM
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
05-22-2011 05:39 AM
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.
05-22-2011 10:13 AM
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
05-22-2011 12:56 PM
Look in the Numeric >> Scaling palette. There is a function called Convert RTD.
05-23-2011 06:14 PM
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?