Question { ADCO, 76111 }

What is the Difference between E/P Positioner and I/P
positioner in a control valve? In which applications the
respective positioners are used in?

Answer

I/P is Current to Pressure converter . Its convert 4 - 20
mA to 3 -15 Psi, This 3-15 psi is not sufficient to operate
valve actuator, so its required additional pneumatic
positioner to operate valve

E/P is current to pressure converter with positioner , its
conert 4-20mA to Pressure (ex: 0 to 3 bar, 1 to 5 bar....),
output pressure of E/P can be adjustable , it not required
additional positioner