Pressure test success!

A rainy Sunday provided an opportunity for some father/son #watergeeking. We rigged up some bungy cords and fired up the garden hose to test the pressure sensor for 3 m of head.
With Max on the hose, everything got thoroughly wet but we managed to fill the vertical riser pipe and record the sensor reading to inform calibration.

With no water in the pipe, I observed a reading of 101, while with 3 m of water I recorded 343. This confirms the sensitivity and gives as a linear adjustment factor for pressure calculations.
While I'm waiting for the second sensor to arrive I'm going to start putting together the prototype rig which will have a few configurations on the outlet to allow testing of submerged and open air discharge scenarios.

I'm also dusting off some high school maths to solve the head/pressure relationship for the check valve. This is proving to be a good mental challenge!