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Part II - Adjustments
ALL MODELS HAVE A TWO-PIECE ADJUSTABLE PLUNGER (SEE
FIGURE 1). THIS FEATURE IS CHARACTERIZED BY A 3/16" HEX
HEAD SCREW INSTALLED IN THE 1/4" HEX PLUNGER. THE LENGTH
OF THIS ASSEMBLY IS ADJUSTED AT OUR FACTORY AND IS CRITICAL
TO THE FUNCTION OF THE CONTROL DURING NORMAL ADJUSTMENT, THESE
COMPONENTS SHOULD NOT BE DISTURBED.
Adjustment Procedure for H117, H117K
For set point adjustments and recalibration, connect control to a calibrated
pressure source.
Remove pressure switch cover. Adjust set point by turning 5/8" hex adjust-
ment screw clockwise (in) to raise set point, or counter-clockwise (out) to
lower set point. Secure adjustment screw by tightening adjustment lock (see
dimensional drawings.) Controls include uncalibrated reference scales for
high, low or mid range settings.
NOTE: Models 190-194 and 490-494 (welded stainless steel diaphragms).
These models are application sensitive. For rising pressure applications, set
point should be adjusted from low pressure up to set point. For falling pres-
sure applications set point should be adjusted from high pressure down to
set point. Wide pressure cycling above and below set point can cause control
band shift.
GAPPING
1) Loosen adjustment lock.
Tools Needed
2) Turn 5/8" hex adjustment screw in, to approximately mid range. This
5/8" Open End Wrench
puts a load on the sensor and exposes the plunger flats. Using a 1/4"
wrench on the plunger and a 3/16" wrench on the plunger hex screw,
turn hex screw out from plunger until switch actuates. If switch is already
actuated, turn plunger hex screw in, until switch deactuates. Turn hex
screw in from this point. (see chart below for Flats and approximate
Gap.)
3) Check set point according to Part II Adjustments.
4) Connect wires and replace cover securely.
Models
171-174
183-194
483-494
358-376
700-706
Figure 1
521-525
531-535
540-548
560-567
IMP117-07
www.ueonline.com
Flats
Approx. Gap
2-2 1/2
.0085 to .0105"
1-1 1/2
.004 to .006"
1-1 1/2
.004 to .006"
5-6
.020 to .025"
3 1/2 - 4
.014 to .017"
2-2 1/2
.0085 to .0105"
2-2 1/2
.0085 to .0105"
2-2 1/2
.0085 to .0105"
1-1 1/2
.004 to .006"
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