What is the formula for calculating the process variable (PV) of a system with a 4-20 mA current loop?
A. PV = (I/Ispan)(PVmax – PVmin) + PVmin
B. PV = (I/Ispan)(PVmin – PVmax) + PVmin
C. PV = (I/Ispan)(PVmax – PVmin) – PVmin
D. PV = (I/Ispan)(PVmin – PVmax) – PVmin
Answer:A
What is the formula for calculating the process variable (PV) of a system with a 4-20 mA current loop?
A. PV = (I/Ispan)(PVmax – PVmin) + PVmin B. PV = (I/Ispan)(PVmin – PVmax) + PVmin C. PV = (I/Ispan)(PVmax – PVmin) – PVmin D. PV = (I/Ispan)(PVmin – PVmax) – PVmin
Explanation: The process variable (PV) of a system with a 4-20 mA current loop can be calculated using the formula PV = (I/Ispan)*(PVmax – PVmin) + PVmin