An electronic controller creates a 4 to 20mA dc signal that must actuate a steam valve for temperature control. The best and most economical choice would be to :
A. Use an all-electric actuator system
B. Convert to a pneumatic signal at the controller and use a pneumatic actuator.
C. Use pneumatic actuator with an electric to pneumatic valve positioner
D. None of the above
Answer:C
An electronic controller creates a 4 to 20mA dc signal that must actuate a steam valve for temperature control. The best and most economical choice would be to :
A. Use an all-electric actuator system B. Convert to a pneumatic signal at the controller and use a pneumatic actuator. C. Use pneumatic actuator with an electric to pneumatic valve positioner D. None of the above