8 Switzer operating instructions pressure switch, model PS01-W1.
OI-PS01-W1 11/2016
Procedure Contd.,
a) In adjustable diff erential model set the lower switching point fi rst. Release the aux.
spring to be free by lifting up the nyloc nut and the Diffl . Adjuster. Using the range
adjuster set the lower switching point. Then load the aux. spring by turning in the
Diffl . Adjuster clockwise to set the upper switching point.
b) Adjusting the diff erential adjuster will shift only the upper switching point i.e. the
switching pressure diff erence (on-off diff erential) alone changes. A clockwise
rotation will increase upper switching point and anti-clockwise rotation will
decrease it.
c) The upper switching point should not exceed the maximum range value.
d) After setting the diff erential, tighten the Nyloc nut to lock the diff erential adjuster to
prevent loosening during operation.
Adjustable on-off diff erential models
On-off diff erential value can be adjusted for a wider value from about 10 to 15% of the
FSR to a maximum of 60% as specifi ed against each range. The minimum value will
vary with diff erent switch combinations. This adjustment is achieved by an auxiliary
spring brought into action when the switch actuating plate moves up before it operates
the microswitch. Adjustment of the load of the spring decides the pressure diff erence
between the on point and off point.
Nyloc nut
Diff erential adjuster
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