10BaseT. said:
well , if you take the span of a 4-20mA signal , you have 16mA , let us divide this 16 into the span of your device (100 PSI) and we should get the ratio :- 100PSI/16mA= 6.25PSI/mA - now you said that your device gave an output of 5.6 mA at 10PSI lets see if this is OK :-
(5.6mA-4mA)*6.25 = 1.6*6.25 = 10
I reckon that is OK then , but you may want to stick a few more PSI up its kilt and make sure that it is reasonably linear .