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)
Ø .470 ± .010
(11,94 ± 0,25)
NON-TURN
C
L
TAB
.400 ± .015
(10,16 ± 0,38)
.320 ± .010
(8,13 ± 0,25)
• 100,000 Life Cycles
• Less than 1.0" Square
• Manufactured to ISO 9001
Standards
.925 ± .010
(23,50 ± 0,25)
.865 ± .015
(21,97 ± 0,38)
.343 ± .025
(8,71 ± 0,64)
.045 ± .005
(1,14 ± 0,13)
.025 ± .002
(0,64 ± 0,05)
SQUARE PIN
(3 PLACES)
.250 ± .015
(6,35 ± 0,38)
3/8-32 UNEF-2A
THREAD
.250 + .001 –.002
(6,35 + 0,03 –0,05)
DIA.
1.020 ±
.010
(25,91 ±
0,25)
.865 ±
.015
(21,97 ±
0,38)
C
L
.500 ± .010
(12,7 ± 0,25)
.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
LOCK TAB (2) FOR
MOUNTING BRACKET 25J5155
.219 ± .004
(5,56 ± 0,10)
90˚
.100 ± .005
(2,54 ± 0,13)
TYP.
C
L
BUSHING
FLATS
Optical and Mechanical
Encoders
I-51
C
L
.590 ± .010
(14,97 ± 0,25)
.250 ± .010
(6,35 ± 0,25)
MOUNTING
BRACKET
C
SHAFT
L
FLAT
TRUTH TABLES
Clockwise Rotation
4-Bit Gray Code-16 Position
Switch
Position
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Code
Position
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Output
1
2
4
8
Switch
Position
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Clockwise Rotation
4-Bit Binary Code Hexadecimal-16 Position
Code
Position
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
1
2
Output
4
8
Clockwise Rotation
Quadrature 2-Bit Code
1/4 Cycle per Detent
Switch
Position
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
"A"
Output
"B"
Indicates closed circuit; blank indicates
open circuit.
Quadrature 2-Bit Code
1/4 Cycle per Detent
CW
ROTATION
HIGH
OUTPUT "A"
LOW
HIGH
OUTPUT "B"
LOW
POS. POS. POS. POS. POS. POS.
#6
#1
#2
#3
#4
#5
Indicates closed circuit; blank indicates
open circuit.
OUTPUT TABLE
Indicates closed circuit;
blank indicates open
circuit. Code repeats
every 4 positions.
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
ORDERING INFORMATION
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
Optical and Mechanical
Encoders
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
Custom materials, styles, color and markings are available. Custom knobs available, see page I-57.
Available from your local Grayhill Distributor.
For prices and discounts, contact a local Sales Office, an authorized local Distributor or Grayhill.
Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois 60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com
I-52
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