Pressure sensor

This needs to measure compensated pressure (old probe P was cheap but differential).

needs to go up to 500psi (200m water is 284psi 1.9MPa converter )

big honeywell sensor is compensated and tough (probe v1 used it)

19C500PA7K

(note the 7 refers to the thread we used before)

is quoted as 100mV full scale o/p at 10V, so thats 50mV at 5V

using our 12 bit ADC Vref=2V means gain of 40 on amp and quantisation of 0.12psi which is 800Pa or 8cm water in theory!

Price - 95£ each min Q 25 is quite an investment!