An electronic loop controller outputs a signal of 8.55 mA to a direct-responding control valve (where
4 mA is shut and 20 mA is wide open). How far open should the control valve be at this MV signal
level?
We must convert the milliamp signal value into a percentage of valve travel. This means
determining the percentage value of the 8.55 mA signal on the 4-20 mA range. First, we need
to manipulate the percentage-milliamp formula to solve for percentage (x):
Therefore, the control valve should be 28.4 % open when the MV signal is at a value of 8.55 mA.
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