SOR Low Range - Manual (Page 4)

4/4 Form 492 (11.13) ©SOR Inc.
Calibration
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Normal Calibration: Turn set point adjustment screw to move spring guide plate
into alignment with desired set point on calibration scale.
Precise Calibration: Device calibrated without reference to calibration scale
and low side vented.
Test apparatus: Manometer
Variable pressure source
Test light or ohmmeter

Connect variable pressure source to manometer and high side pressure port.

Connect test light or ohmmeter to C-Common and NO - Normally Open switching
element contacts.

Raise pressure and note manometer reading when circuit closes.

Slowly drop pressure and note manometer reading when circuit opens.

Use a screwdriver to turn set point adjusting screw: counterclockwise to increase set
point, or clockwise to decrease set point.

Repeat steps 3, 4 and 5 until contacts change at desired increasing or decreasing
differential pressure set point.
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.