I am developing a project about a differential pressure flowmeter where I want to measure the pressure difference by a diaphragm strain gauge sensor. I ordered BF350-10KA diaphragm sensor but now I am wondering if I can use this type of sensor with Arduino kit and with HX711 amplifier.
Will I be able to measure the voltage output with the Arduino or it's not compatible with it?
Or shouls I look for another module to get the measurement from the strain gauge?
Provide a link to the sensor data?
If you are measuring differential
Pressure, won’t both sides of the diaphragm be in contact with the fluid and hence your strain gauge also
?
The strain on the diagram may not be linear with pressure and will need temperature compensation .
Have you looked at using a pressure transducer as an easier option?
Whenever I ask for the datasheet they give me the catalogue, hope it's fine with you
The link: The catalogue of strain gauges for Transducer
Yes that is correct the strain gauge will be in contact with the fluid from both High and Low sides. Can you give me an examples of pressure transducers? something like MPX5010DP for example?
You need to know :
- What the fluid is
- What is the range of differential pressures, ( and corresponding flow ranges )
- How accurately you want to know the result
4 what is the static pressure in the pipe - What sort of electrical output do you want
Then look at the specifications of transducers that suit .
Don’t forget the square root relationship between flow and pressure drop places a high accuracy demand on the pressure sensot
If you still want to go with your first approach...
The BF350-10KA appears to be a standard Wheatstone bridge type of strain gauge, with a nominal resistance of 350 ohms. If that's true, then you should be able to use it with an HX711 and Arduino.
But whether that particular strain gauge is suitable for your application is an open question, as is whether another type of sensor would be more appropriate.
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Post a diagram of your apparatus and the pressure ranges you expect.
Yes, it will work with an arduino and HX711. But if you haven't used bare strain gauges before, the gluing it to a compatible diaphragm and plumbing it into your system could be an adventure.
If you have the option using a COTS differential pressure transducer for your application, you should take it.
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The flow rate of my system should be between 10 to 60 L/min and the pressure input range should be between 250 kPa to 400 KPa
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Are you familiar with flow measurement across an orifice? Differential pressure varies with the square of flow rate, a decrease of 6 times flow rate (60 : 10 L/min) = 36 times decrease in differential pressure.
Have you considered a differential pressure sensor like these Honeywells? Check page 6 in datasheet.
Honeywell sensors
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