DeZurik PMV P36C Manual - Halaman 10

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DeZURIK

PMV P36C and P41C Positioners

used with DeZURIK Pneumatic Actuators

Resetting the Range Spring

If the correct span cannot be obtained after 2 or 3 zero/span adjustments, reset the range spring as

follows:

1. Disconnect air supply and remove the range spring from the positioner.

2. Loosen screws (1 and 2).

3. Adjust the collar so it is 3/16" or 9/32"* below the flange face.

*Depending on spring style—see Figure 7

4. Adjust the spring end to 1/32" clearance.

5. Tighten screws (1 and 2).

6. Adjust the lower zero screw so that 1 or 3 threads are showing (depending on spring style).

7. Reinstall the range spring assembly.

To adjust the indicator, remove front cover and pull the

indicator upward until it comes off the Allen screw. Before

installing the indicator make sure the Allen screw is

tightened. Press the indicator on the screw and adjust it

by rotating clockwise into position.

The dampers (5) located on the connecting block provide

a simple means of adjusting the actuator travel speed.

See Figure 8.

For double acting actuators, set the damper marked

Supply to fully open and adjust only the damper marked

Outlet.

For single acting actuators, adjust both the Supply and

Outlet dampers for operation.

D10327

Figure 7 – Spring Styles

Page 10

Figure 8 – Speed Dampers

August 2012