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IMP117 11 

3

1.63

(41.4 mm)

A

2.34

(59.4 mm)

4.22

(107.2 mm)

with cover

4

(101.6 mm)

1/2 NPT

CONDUIT

0.895

(22.7 mm) DIA.

KNOCK-OUT

0.895

(22.7 mm) DIA.

KNOCK-OUT

ADJUSTMENT 

SCREW

2.75

(69.9 mm)

ADJUSTMENT 

LOCK

CLEARANCE FOR

 1/4 (6.35 mm) 

SCREW 

2 MOUNTING 

HOLES

Cover removed in front view

Part III - Dimensions

Table 1

GAPPING IS FACTORY-SET AND CRITICAL TO THE 

FUNCTION OF THE SWITCH. THIS PROCEDURE 

SHOULD ONLY BE PERFORMED IF THE PLUNGER HAS 

ACCIDENTALLY BEEN ADJUSTED.

 

Loosen adjustment lock.

❷ 

Turn 5/8” hex adjustment screw clockwise (left), to 

approximately mid range. This puts a load on the sensor and 

exposes the plunger flats.

❸ 

Using a 1/4” wrench on the plunger and a 3/16” wrench 

on the plunger hex screw, turn hex screw counter-clockwise 

(right) from plunger until switch actuates. If switch is already 

actuated, turn plunger hex screw clockwise (left), until switch 

deactuates. Turn hex screw clockwise (left) from this point. 

(See Table 1 for Flats and approximate Gap.)

❹ 

Check set according to Part II Adjustments.

❺ 

Connect wires and replace cover securely.

Models

Flats

Approx. Gap

171-174

2 to 2 1/2

.0085 to .0105”

183-194

1 to 1 1/2

.004 to .006”

483-494

1 to 1 1/2

.004 to .006”

358-376

5 to 6

.020 to .025”

700-706

3 1/2 to 4

.014 to .017”

521-525

2 to 2 1/2

.0085 to .0105”

15737

5 to 6

.020 to .025

531-535

2 to 2 1/2

.0085 to .0105”

540-548

2 to 2 1/2

.0085 to .0105”

565-567

1 to 1 1/2

.004 to .006”

Recommended Practices

•  A redundant device is necessary for applications 

where damage to the primary device could 

endanger life, limb or property. A high or low 

limit switch is necessary for applications where 

a dangerous runaway condition could result.

• 

Monitor operation to observe warning signs of 

possible damage to device, such as drift in set 

point or faulty display. Check device immediately.

• 

Preventative maintenance and periodic testing 

is necessary for critical applications where 

damage could endanger property or personnel.

All dimensions stated in inches (millimeters)

Dimensional drawings for all models may be found at www.ueonline.com

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