SOR High Static Operation - Manual (Page 4)

4/8 Form 420 (01.13) ©SOR Inc.
Calibration
Coarse Calibration:
Device calibrated without reference to system (static) pressure (Lo side vented).
Test apparatus:
Pressure gauge
Variable pressure source
Test light or ohmmeter
1. Remove the weathertight knurled cap.
2. Insert a 5/32 Allen hex wrench into Set Point adjustment screen.
3. Connect a test light or ohmmeter to C – Common and NO – Normally Open.
4. Increase the pressure to the desired Set Point on increasing pressure.
5. Turn the hex wrench clockwise to increase the Set Point and counterclockwise to
decrease the Set Point. Note the actuation/deactuation by test light or ohmmeter.
6. For the Set Point on Decreasing pressure, decrease the pressure to the desired Set
Point and repeat Step 5.
7. Remove the hex wrench and replace the weathertight cap.
Precise Calibration:
The device is calibrated with reference to system (static) pressure. Performance is
enhanced when calibration is accomplished under simulated system pressure profile or as
it is intended to be used in actual service.
Test apparatus:
Differential pressure gauge
Variable pressure source
Block/bleed and equalizer valves
Test light or ohmmeter
1. Remove the weathertight knurled cap.
2. Insert a 5/32 Allen hex wrench into the Set Point adjustment.
3. Connect a test light or ohmmeter to C – Common and NO – Normally Open.
4. Increase the pressure equally on Hi and Lo sides to the desired system (static) operating
pressure
(equalizer valve open).
5. To adjust Set Point on Increasing Differential Pressure: Close the equalizer valve and
bleed the Lo side until the desired pressure appears on indicator and the Set Point is
verified by a test light or ohmmeter. Turn the hex wrench clockwise to increase the Set
Point and counterclockwise to decrease the Set Point. Note actuation/deactuation by
test light or ohmmeter.
6. To adjust the Set Point on Decreasing Differential Pressure: Differential Pressure must be
at or above the Increasing Set Point. Slightly open the equalizer valve until desired
decreasing pressure appears on the indicator and the set point is verified by a test light
or ohmmeter. Perform Step 5 above as necessary.
7. Remove the Allen wrench and replace the weathertight cap.
Do not remove other covers or attempt to adjust other parts of the mechanism. All
have been precisely positioned at the factory and should not be moved in the fi eld.