Pressuretrol to Vaporstat with timer

those pressuretrol devices are notoriously badly calibrated. of a few i've worked with on my bench not even one (!) was properly calibrated and a few outright would never work without adjustement. vaporstat is basically pressuretrol with a large diaphram. they are all made in the same factory by a guy who can't wait for friday beer.

if your vaporstat cuts out at 1psi (instead o.75) and cuts in at 0.5, just play with the scale screw so it works based on your desired settings. you have a low pressure gauge to confirm so you are set.