If the valve position is not advancing according to the relationship above, an adjustment is required.
Use “zero adjustment” to set the valve position to a specific input value.
For example, with an input of 12mA, the valve should be @ 50%.
Use the “span adjustment” to adjust the % change the valve moves relative to the input value.
6. Stroke the valve – Take the valve thru a complete cycle of 4 – 20 mA inputs verifying that the correct valve position exists with a given input value.