DeZurik P41D Instruction - Page 7

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Adjustments
(continued)
3. Adjust the length of the rod until the valve is in the position corresponding to the minimum input
signal.

Zero Adjustment

1. Set the positioner input signal at the minimum value of its range, for example, 4mA for a 4-
20mA range.
2. Turn the zero adjust screw clockwise until the valve closes. (See Figure 1 for location of
adjusting screws.)
3. Increase the instrument signal slightly above the minimum range value.
Note: If the valve does not begin to open, turn the zero adjust screw counterclockwise until the valve
just starts to move.
4. Since the zero and range adjustments are interrelated, check the range setting and readjust it, if
necessary.

Range Adjustment

1. Set the positioner input signal at 20mA.
2. Turn the range adjust screw until the valve is in the OPEN position.
3. Decrease the input signal slightly.
4. If the valve does not begin to close, turn the range adjust screw until the valve just starts to
move.
5. Since the zero and range adjustments are interrelated, check the zero setting and readjust it, if
necessary.
August 2012
Page 7
DeZURIK
D10112