Model 25
www.vishay.com
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 loc
kwasher (supplied with potentiometer).
3. Turn potentiometer shaft counterclockwise to obtain minimum
resistance or v
oltage 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