Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois 60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com
Optical and Mechanical
Encoders
Mechanical Encoders
SERIES 25L
Hex, Gray and Quadrature Code
FEATURES
•Price Competitive to Similar
Designs
•Quality Construction and Contact
Materials
•Multiple Code and Indexing
Choices
DIMENSIONS In inches (and millimeters)
1.020 ±
.010
(25,91 ±
0,25)
.590 ± .010
(14,97 ± 0,25)
.865 ±
.015
(21,97 ±
0,38)
.865 ± .015
(21,97 ± 0,38)
.925 ± .010
(23,50 ± 0,25)
C
L
C
L
.100 ± .005
(2,54 ± 0,13)
TYP.
90˚
BUSHING
FLATS
SHAFT
FLAT
.219 ± .004
(5,56 ± 0,10)
Ø .470 ± .010
(11,94 ± 0,25)
.320 ± .010
(8,13 ± 0,25)
.400 ± .015
(10,16 ± 0,38)
C
L
NON-TURN
TAB
3/8-32 UNEF-2A
THREAD.250 + .001 –.002
(6,35 + 0,03 –0,05)
DIA.
.250 ± .015
(6,35 ± 0,38)
.500 ± .015
(12,7 ± 0,38)
NON-TURN TAB
Ø .120 ± .005 (3,05 ± 0,13) WIDE
BY .068 ± .005 (1,73 ± 0,13) THICK
.250 ± .015
(6,35 ± 0,38)
.343 ± .025
(8,71 ± 0,64)
.045 ± .005
(1,14 ± 0,13)
.250 ± .010
(6,35 ± 0,25)
C
L
C
L
.500 ± .010
(12,7 ± 0,25)
.025 ± .002
(0,64 ± 0,05)
SQUARE PIN
(3 PLACES)
LOCK TAB (2) FOR
MOUNTING BRACKET 25J5155
MOUNTING
BRACKET
Indicates closed circuit; blank indicates
open circuit.
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
8421
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
Clockwise Rotation
Code
Position
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
8421 Output
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
Switch
Position
Clockwise Rotation
4-Bit Binary Code Hexadecimal-16 Position
4-Bit Gray Code-16 Position
Indicates closed circuit;
blank indicates open
circuit. Code repeats
every 4 positions.
Quadrature 2-Bit Code
1/4 Cycle per Detent
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
"B""A" Output
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
Switch
Position
Clockwise Rotation
Switch
Position Code
Position Output
Indicates closed circuit; blank indicates
open circuit.
•100,000 Life Cycles
•Less than 1.0" Square
•Manufactured to ISO 9001
Standards
TRUTH TABLES
Quadrature 2-Bit Code
1/4 Cycle per Detent
OUTPUT TABLE
CW
ROTATION
#6
POS.
#5
POS.
#4
POS.
#3
POS.
#2
POS.
#1
POS.
OUTPUT "B"
OUTPUT "A" HIGH
HIGH
LOW
LOW
I-51
Optical and Mechanical
Encoders
Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois 60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com
Mechanical Encoders
SPECIFICATIONS
Electrical Ratings
Switching Loads: 1.5 mA at 115 Vac, resistive;
150 mA at 14 Vdc, resistive
Current Carrying Capacity: 250 mA
maximum at 28 Vdc, resistive load
Contact Resistance: 75 mΩ, typical
Insulation Resistance: 1000 mΩ minimum
between terminals
Voltage Breakdown: 1000 Vac minimum
between terminals
Life Expectancy: 100,000 cycles of operation at
rated loads. One cycle of operation is a rotation
through all of the active positions and a return to
the starting position.
Mechanical Ratings
Rotational Torque: 2 to 6 in-oz
Operating Temperature Range: -65 C° to +85 C°
Storage Temperature Range: -65 C° to +85 C°
Continuous Rotation: All standard switches
are continuous rotation. Desired stop locations
supplied upon request.
Anti-Rotation Device: Integral non-turn tab,
flatted bushing, .375" diameter, .320 double “D”
across flats.
Termination: Standard is PC style, parallel to
shaft, facing rear. Options include PC, parallel to
shaft, facing front; PC, perpendicular to shaft.
Panel Mounting Torque: 10 in-lbs maximum
Materials and Finishes
Bushing/Housing and Shaft/Rotor: Reinforced
thermoplastic
Detent Ball: Stainless steel, nickel-plated
Detent Spring: Tinned music wire
Contacts: Beryllium copper, gold plate over
nickel
Terminals: Copper alloy, CDA #725, solder
plate over nickel
Output Board: FR-4, copper/nickel-plated
Mounting Hardware: Brass, cadmium-plated
hex nut
Mounting Bracket: Stainless Steel, tin-plated
Series: 25L = Economical, single deck encoder
Housing Color: B = Black housing*; R = Red housing
Angle of Throw: 10 = 10°, 36 positions; 11 = 11.25°, 32 positions;
15 = 15°, 24 positions; 18 = 18°, 20 positions;
22 = 22.5°, 16 positions; 30 = 30°, 12 positions;
45 = 45°, 8 positions
25LB10-Q-Z Mounting Bracket: Z = with bracket, Blank = no bracket
Code Output: H = Hexadecimal available only in 22.5°
G = Gray available only in 22.5°
Q = Quadrature (2-bit)
* Cadmium free
ORDERING INFORMATION
Available from your local Grayhill Distributor. For prices and discounts, contact a local Sales Office, an authorized local Distributor or Grayhill.
Custom materials, styles, color and markings are available. Custom knobs available, see page I-57.
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