38.
A pneumatic proportional controller is used to control temperature within the range of 60 to 1000F. The controller is adjusted so that the output pressure goes from 3 psi (valve fully open) to 15 psi (valve fully closed) as the measured temperature goes from 71 to 750F with the set-point held constant. Find the gain (psi/ ͦF);
A:
0.3
B:
3.0
C:
0.25
D:
0.2
The answer is:
B
