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I have identified and ordered a sensor that has a built in amplifier… 3.92 kPa and 1.2 Vdc range of signal that will work fine.? No extra amplifiers needed.? ?It’s the MP3V5004DP part.? It’s intended to be used with washing machines as a fill level device.

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From: [email protected] [mailto:[email protected]] On Behalf Of n0bhc via Groups.Io
Sent: Saturday, March 28, 2020 2:56 PM
To: [email protected]; [email protected]
Subject: Re: [VentilatorDevelopers] Pressure sensor selection $FLOWSENSOR

Here is a differential amp approach:

I believe it uses the dif sensor Bill was considering.

Bob

In a message dated 3/28/2020 12:22:39 PM Central Standard Time, wb6b@... writes:

Should we need a op-amp here is a low cost chopper stabilized op-amp (TSZ124IPT) available in large quantities.?

I have a development board that includes, on-board, the capability of measuring the current being used by the development processor chip. As this requires accurately measuring low voltages I checked what they were using for an amplifier.?

Here is the manual for the development board. Towards the end of the document you will see the circuit they use with the op-amps. However, I believe it would only take one of the four op-amps to amplify the strain gauge pressure sensors, leaving op-amps for more analog inputs. A full instrumentation amplifier configuration should not be necessary. (and their design is just added voltage followers, not a true instrumentation amplifier.)

Tom, wb6b

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