Model 25

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Vishay Spectrol

Revision: 06-Aug-12

1

Document Number: 57079

For technical questions, contact: sferprecisionpot@vishay.com

THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT

ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000

Model 25 (PR1)

46 mm Diameter, 20 Turn Dial

FEATURES

• Large package size

• For use with precision potentiometers or other

devices, up to 20 turns

• Excellent readability

• Precision feel - no backlash

•Cast housing

• Material categorization: For definitions of compliance

please see www.vishay.com/doc?99912

DIMENSIONS in millimeters (inches)

QUICK REFERENCE DATA

Sensor type

DIALS

Market appliance

Industrial

Dimensions

46 mm diameter

RoHS

COMPLIANT

MECHANICAL SPECIFICATIONS

Accepts Shaft Diameter

6.35 mm (0.250")/6 mm/3.17 (0.125")/3 mm

Number of Turns

0 to 20

Dial Division

100 per turn

Torque with Brake Engaged

5 oz. - in (350 g - cm) min.

Markings

Black on satin chrome

Weight

75 g

Set Srew

UNC 4-40

Hex Key Size

1.27 mm (0.05")

Bushing Extension Beyond Panel

6.35 mm (0.250") max.

Shaft Extension Beyond Panel

18.1 mm (0.710") min.

22.5 mm (0.925") max.

ORDERING INFORMATION/DESCRIPTION

25

A

11

B010

e

MODEL

SHAFT DIAMETER

ACCOMMODATION AND FIXINGS

FINISH

PACKAGING

LEAD FINISH

Example: 25 - A - 11

A 1/4" dia. shaft - 1set screw



B 6 mm metric bore - 1 set screw



C 1/8" dia. shaft -1 set screw



D 3 mm metric bore - 1 set screw

11 Satin chrome, black markings (standard)



21 Black chrome, white markings



41 Satin chrome, white markings



SAP PART NUMBERING GUIDELINES

25

A

11

B10

MODEL

SHAFT DIAMETER

FINISH

PACKAGING

Using the existing Antirotation Lug

1. Drill 3.2 mm (0.125) diameter antirotation pin hole on vertical

centerline 14.3 mm (0.562) below center of potentiometer

mounting hole.

2. Mount potentiometer shaft counterclockwise to obtain minimum

resistance or voltage ratio. This is not necessarily identical with the

mechanical stop.

4. Loosen set screws in knob of dial. Set dial. Set dial to “0.0” reading.

5. While holding outer ring of dial, position unit lightly against panel.

Tighten knob set screws to potentiometer shaft.

Ø 10.36 mm

(0.41")

Ø 3.17 mm

(0.125")

Ø 14.30 mm

(0.562")

PANEL HOLE PATTERN

Using the Antirotation Device

1. Remove antirotation lug from dial by using pliers.

2. Mount potentiometer in panel with antirotation device nut

(supplied with dial) and lockwasher (supplied with potentiometer).

3. Turn potentiometer shaft counterclockwise to obtain minimum

resistance or voltage ratio. This is not necessaryly identical with

the mechanical stop.

4. Loosen screws in knob of dial. Set dial to “0.0” reading.

5. While holding outer ring of dial, position unit lightly against panel.

Tighten knob set screws to potentiometer shaft.

EASY REMOVABLE WITH PLIERS