IMP120-14
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Part II - Adjustments
Tools Needed
Screwdriver
5/8” open end Wrench
5/64” Allen Wrench
AfTer CoMPleTIng ADJuSTMenTS on TYPe H121 AnD H122
ConTrolS, be Sure To re-InSTAll ADJuSTMenT Cover.
Do noT over TIgHTen Cover SCreWS.
for set point adjustment and gapping, connect control to a calibrated
pressure source.
Types J120 (All) and J120K Models 455-559 (See Figure 4a)
remove cover. loosen phillips screw adjustment lock. Adjust set point
by turning 5/8” hex adjustment screw clockwise (In) to raise set point,
or counterclockwise (ouT) to lower set point. Secure adjustment
screw by tightening adjustment lock.
Type J120K Models 36-39,147-S157B, & 367 (See Figure 4b)
r e m o v e f r o n t c o v e r a n d g a s k e t f r o m s e n s o r
assembly located below enclosure by unscrewing 4 phillips screws.
loosen phillips screw adjustment lock. Adjust set point by turning 5/8”
hex screw clockwise (In) to increase setting or counterclockwise (ouT)
to decrease setting. Adjusting screw should be locked by tightening
adjustment lock.
Types H121, H121K
Adjust set point by turning external knob and pointer to desired
setting on scale.
Types H122, H122K
Individual microswitches may be set together or separately by up
to 100% of range. The front (low) microswitch should never be
set higher than the rear (High) microswitch. Turning external
knobs will increase or decrease each switch setting independently.
Types H122P
Individual switches may be set together or separately by up to 60%
of range. The front switch is set by turning the internal calibrating
screw to the right for lower set point and turning to the left for higher
set point. When not set together, the front switch should never be set
higher than the rear switch. Turning the external knob will increase or
decrease both switch settings simultaneously without disturbing their
relationship.
Controls with Options
Option 1519 and other models with an Adjustable Deadband
Switch
This microswitch has an integral adjustment wheel. Turning this
wheel raises and lowers the pressure rise set point. The fall set point
remains constant. Consult factory for additional information.
Type J120, Option 1530, Manual Reset
This microswitch, when actuated, remains actuated until the pressure
drops sufficiently to allow the reset knob (located on the left side of
the control) to be manually turned to reset the microswitch.
Option M210 Indicator for
Differential Pressure Controls, Span Adjustment
(See figure 5). To adjust indication for maximum accuracy at any
desired set point, follow steps 1 thru 3 listed below:
1) remove front window and gasket (four screws) to gain access
to span adjustment.
2) Connect control to calibrated gauges and set required differential
pressure.
3) using a screwdriver, slowly turn the span adjustment to obtain
required indication. remount the front gasket and window.
NOTE:
Spanning adjustment will not affect the mid-range indication.
The adjustment is factory calibrated and sealed to indicate tampering.
Do noT forCe SPAn ADJuSTMenT, SInCe PerMAnenT
DeforMATIon of THe lInkAge MeCHAnISM MAY reSulT.
Figure 5
Option M210
J120K: Opposed Sensor,
Models 36-39, 147-157, S147B,
S157B, 367
Figure 4b
Figure 4a
DO NOT TURN
