Choosing liquid pressure sensor for project

Projects General Guidance
1

Hello,

I am working on a project where I am designing a package or protecting fluid (stored in bags) during a 50 foot drop. The issue with the fluid we are protecting is that it breaks down at 300mmHG. So, in order to test that our package is working, we would like to use an Arduino based DAQ to measure both the accelerations and the pressures that the fluid is exposed to.

So, for the pressure transducer, we need it to fulfill the following requirements.

  • Must work with liquid
  • Range must be able to measure roughly 300mmHG (40kpa) +- a
    couple hundred mmHG
  • Must either be analog or have a high sampling rate
  • Must be compatible with arduino

If anyone has any ideas on where I should start looking that would be greatly appreciated.

2

What is the purpose as all the data will be lost after the sample is taken?

4

The data will be saved on an SD card using an SD card module

5

Is this also getting dropped? What happens when this all stops dropping?

6

What is the pH of the liquid?

Some sensors go "nuts" if pH is not within range.

7

For my curiosity, what is this liquid that breaks down at 40kPa and is thrown down 50ft in bags..?

8

The ph will be between 5.5 and 7

9

Then we save the run to the SD card and post process in Python or Matlab

10

The question was what happens to the Arduino and other devices when the falling abruptly stops?

11

We are making a protective case.

12

Be sure to test your project first with water and raw hens eggs.

13

Number?

14

This one has a 1ms response time: MPX2053, 50 kPa Temperature Compensated Pressure Sensors-Product data sheet

You can find faster sensors easily but they will cost more.

15

Our hand calculations are showing that we need a sampling rate of greater than 4 Khz. No one on my team of all Mechanical Engineering Majors have deep experience in setting up DAQs so we are really having a hard time understanding what we need to order for our project.

16

How about to ask Mouser, Digikey or any other major electronics distributors? I'm sure they can help, or refer you to a manufacturer, like Honeywell.

17

During the deceleration phase the bag will be distorted into the shape of the container that forms your packaging, therefore the minimum pressure can be calculated using the height of the liquid and the measured G force. Then you have the added complication of pressure waves being reflected within the fluid. For water the speed of sound is 1500 m/s. If your container is 10cm wide then a wave will traverse it in 66 microseconds thus requiring a sensor that has a bandwidth of 15Khz.

18

I expect you will have problems trying to sample at the correct time. You need to implement Peak Detection as part of your project. Check this link for an idea: https://www.infineon.com/dgdl/Infineon-Implementing_Accurate_Peak_Detection-Whitepaper-v01_00-EN.pdf?fileId=8ac78c8c7d0d8da4017d0fb228722683&da=t

19

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