Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois 60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com
Standard Keypads
Keyboards and Keypads
DIMENSIONS In inches (and millimeters)
SERIES 88
Sealed, Flange Mounted
FEATURES
•Sealed Keyboard
•Colorful Graphic Overlay
•Audible, Snap-Dome Contact
•User Legendable Styles
•3,000,000 Operations per Button
•Optional Panel Seal Gasket to
Protect Your Equipment
3x4 Keyboard
Termination In inches (and millimeters)
3x4
Code and Truth Table
Dots in the chart indicate connected terminals
when switch is closed. Terminals are identified on
the keyboard.
3.000
± .015
(76,2
± 0,38)
2.800
± .010
(71,12
± 0,25)
.200 ± .010
(5,08 ± 0,25)
A B C F G H L M N
2.200 ± .015
(55,88 ± 0,38)
2.000 ± .010
(50,8 ± 0,25)
.100 (2,54)
TYP.
RETAINING
STUDS
.220 ± .010
(5,59 ± 25,4)
.100 ± .010
(2,54 ± 0,25)
BUTTON NO. 1
.093 ± .005
(2,36 ± 0,13)
DIA. 4 PLS.
C
L OF 2.200 (55,88) DIM.
•
•
•
1
2
3
4
5
6
7
8
9
10
11
12
CODES
3x4 Matrix Single Pole/Common Bus
TERMINAL LOCATION
BUTTON LOCATION
F E D K J H G
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
J E A K F B L G C M H D N
•
•
•
•
•
•
•
•
•
•
•
•
.500 .010
(12,7 ± 0,25)
(3 EQ. SPS)
TOL. NON-
ACCUM.
.380 (9,65)
SQ. TYP.
.750 ± .010
(19,05 ± 0,25)
COL 1
COL 2
COL 3
1.990 + .000 - .010
(50,55 + .000 - 0,25)
.055 ± .010
(1,40 ± 0,25)
.105 ± .010
(2,67 ± 0,25)
ROW 1
ROW 2
ROW 3
ROW 4
2.690 + .000/
- .010
(68,33 + .000/
- 0,25)
SWITCH KEY
IDENTIFICATION
(FOR REF. ONLY)
.500 ± .010 (12,7 ± 0,25)
(2 EQ. SPS.) TOL. NON-
ACCUM.
.600 ± .010
(15,24 ± 0,25) .128 ± .010
(3,25 ± 0,25)
.280 ± .010
(7,11 ± 0,25)
.025 ± .002
(0,64 ± 0,05)
SQUARE
TERMINAL
.360 ± .010
(9,14 ± 0,25)
.072
± .010
(1,83
± 0,25)
COL = COLUMN
BUTTON AREAS ARE EMBOSSED
1 2 3
4 5 6
7 8 9
10 11 12
.150 ± .005
(3,81 ± 0,13) R.
D-28
Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois 60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com
Standard Keypads
Keyboards and Keypads
SERIES 88
Sealed, Flange Mounted
FEATURES
•Sealed Keyboard
•Colorful Graphic Overlay
•Audible, Snap-Dome Contact
•User Legendable Styles
•3,000,000 Operations per Button
•Optional Panel Seal Gasket to
Protect Your Equipment
DIMENSIONS In inches (and millimeters)
4x4 Keyboard
Termination In inches (and millimeters)
4x4 Dots in the chart indicate connected terminals when switch
is closed. Terminals are identified on the keyboard.
Code and Truth Table
3.000
± .015
(76,2
± 0,38)
2.800
± .010
(71,12
± 0,25)
.200 ± .010
(5,08 ± 0,25)
A B E F G K L M R S T
2.700 ± .010
(68,58 ± 0,25)
2.500 ± .010
(63,5 ± 0,25)
.100 (2,54)
TYP.
RETAINING
STUDS
.220 ± .010
(5,59 ± 25,4)
.100 ± .010
(2,54 ± 0,25) BUTTON NO. 1
.093 ± .005
(2,36 ± 0,13)
DIA. 4 PLS.
C
L OF 2.700 (68,58) DIM.
.050 ± .003
(1,27 ± 0,08)
CODES
4x4
Matrix Single Pole/Common Bus
TERMINAL LOCATION
BUTTON LOCATION
H G F E M L K J
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
P J E A R L F B S M H C T N G D K
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
.500 .010
(12,7 ± 0,25)
(3 EQ. SPS)
TOL. NON-
ACCUM.
.380 (9,65)
SQ. TYP.
.750 ± .010
(19,05 ± 0,25)
COL 1
COL 2
COL 3
COL 4
2.490 + .000 - .010
(63,25 + .000 - 0,25)
.055 ± .010
(1,40 ± 0,25)
.105 ± .010
(2,67 ± 0,25)
ROW 1
ROW 2
ROW 3
ROW 4
2.690 + .000/
- .010
(68,33 + .000/
- 0,25)
SWITCH KEY
IDENTIFICATION
(FOR REF. ONLY)
.500 ± .010 (12,7 ± 0,25)
(3 EQ. SPS.) TOL. NON-
ACCUM.
.600 ± .010
(15,24 ± 0,25) .128 ± .010
(3,25 ± 0,25)
.280 ± .010
(7,11 ± 0,25)
.025 ± .002
(0,64 ± 0,05)
SQUARE
TERMINAL
.360 ± .010
(9,14 ± 0,25)
.072
± .010
(1,83
± 0,25)
COL = COLUMN
BUTTON AREAS ARE EMBOSSED
1 2 3 4
5 6 7 8
9 10 11 12
13 14 15 16
.150 ± .005
(3,81 ± 0,13) R.
D-29
Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois 60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com
Standard Keypads
Keyboards and Keypads
DIMENSIONS In inches (and millimeters)
5x4 Keyboard
Termination In inches (and millimeters)
5x4 Keyboard Dots in the chart indicate connected terminals when switch is closed.
Terminals are identified on the keyboard.
Code and Truth Table
CODES
5x4 Matrix Single Pole/Common Bus
TERMINAL LOCATION
BUTTON LOCATION
P N K G F J L M H
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
T P M H D U Q L G C V R K F B W S J E A N
A D E F J K L P Q R U V W
C
L OF 3.200 (8,13) DIM.
3.000
± .015
(76,2
± 0,38)
2.800
± .010
(71,12
± 0,25)
.100 (2,54)
TYP.
3.200 ± .010
(81,28 ± 0,25)
3.000 ± .010
(76,2 ± 0,25)
.100 ± .010
(2,54 ± 0,25)
RETAINING
STUDS
.220 ± .010
(5,59 ± 25,4)
BUTTON NO. 1
.093 ± .005
(2,36 ± 0,13)
DIA. 4 PLS.
SERIES 88
Sealed, Flange Mounted
FEATURES
•Sealed Keyboard
•Colorful Graphic Overlay
•Audible, Snap-Dome Contact
•User Legendable Styles
•3,000,000 Operations per
Button
•Optional Panel Seal Gasket to
Protect Your Equipment
.500 .010
(12,7 ± 0,25)
(3 EQ. SPS)
TOL. NON-
ACCUM.
.380 (9,65)
SQ. TYP.
.750 ± .010
(19,05 ± 0,25)
COL 1
COL 2
COL 3
COL 4
COL 5
2.990 + .000 - .010
(75,95 + .000 - 0,25)
.055 ± .010
(1,40 ± 0,25)
.105 ± .010
(2,67 ± 0,25)
ROW 1
ROW 2
ROW 3
ROW 4
2.690 + .000/
- .010
(68,33 + .000/
- 0,25)
SWITCH KEY
IDENTIFICATION
(FOR REF. ONLY)
.500 ± .010 (12,7 ± 0,25)
(4 EQ. SPS.) TOL. NON-
ACCUM.
.600 ± .010
(15,24 ± 0,25) .128 ± .010
(3,25 ± 0,25)
.280 ± .010
(7,11 ± 0,25)
.025 ± .002
(0,64 ± 0,05)
SQUARE
TERMINAL
.360 ± .010
(9,14 ± 0,25)
.072
± .010
(1,83
± 0,25)
COL = COLUMN
BUTTON AREAS ARE EMBOSSED
1 2 3 4 5
6 7 8 9 10
11 12 13 14 15
16 17 18 19 20
.150 ± .005
(3,81 ± 0,13) R.
D-30
Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois 60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com
Standard Keypads
Keyboards and Keypads
SPECIFICATIONS
Rating Criteria
Rating at 24 Vdc: 10 milliamps, resistive
Contact Resistance: Compatible with MOS, TTL
and DTL (10 ohms maximum)
Voltage Breakdown: 250 Vac between mutually
insulated parts
Life Expectancy: 3,000,000 operations per
button
Contact Bounce: Less than 4 milliseconds at
make, 10 milliseconds at break
Temperature: -40°C to +80°C
Operating Features
Button Travel: 0.015"(0,38 mm) nominal total
travel
Typical Operating Force: 350 grams
Materials and Finishes
Housing: ABS polycarbonate, black
Graphic Overlay: Polyester
Contact Dome: Stainless steel, selectively gold-
plated
Terminals: Copper alloy, CDA No. 725. Tin-lead
plated
SEALING OF KEYBOARDS
The graphic legend is silk-screen printed on
the second surface of a clear polyester film,
providing maximum legend protection. It
withstands high humidity, and it is resistant to
scratching, marring, and dulling of the surface
caused by fingernails, wiping cloths, and
cleaning materials. It has excellent solvent
resistance to water, petroleum oil, alcohols
and aliphatic hydrocarbons.
These common liquids do not attack the
overlay: 5% acetic acid, 5% citric acid, 2%
detergent solution, soapy water, 30% hydrogen
peroxide, wine, beer, whiskey, coffee, cocoa,
milk, tomato juice, lemon juice, etc.
Hydrocarbons, ketones and freon do not affect
the overlay. But, we recommend that you do not
subject the keyboard to these chemicals, since
they may affect the switch housing, which is
ABS plastic. To discuss a particular solvent,
contact Grayhill.
Protect your equipment in outdoor or harsh
environmental conditions by sealing the
keyboard to the equipment panel. Use an
optional gasket with the keyboard. There are
two types of gaskets: one for mounting the
keyboard beneath the panel, and one for
mounting it above the equipment panel. See
Panel Seal Gaskets.
The contact system is internally sealed by a
special adhesive backed sheet that holds the
domes in position on the PC board.
D-31
STANDARD LEGENDS
Colorful graphic overlays are polyester with a
tough acrylic bond to provide maximum
protection against dirt and moisture. Second
surface printed, the overlay wipes clean and
continues to look bright and bold throughout the
keyboard life. Available through distributors. For
instant custom legends, order separate blank
keyboards as indicated in the Ordering
-252 -262 88-201 88JB2, 88JC2
-143 -152 -172
Information section and choose one of the
clear window overlays below; then order a
sheet of legend inserts. Or, if you prefer, order
the keyboard custom printed by Grayhill; see
Ordering Information.
88-101 88AB2,
88AC2
88-001 88BB2,
88BC2
-052 -072 -082
Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois 60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com
Sealed Keypads
Keyboards and Keypads
PANEL SEAL GASKETS
Subpanel Mounting Topside Mounting
Subpanel 3x4 Part No. 88M2001-2
Subpanel 4x4 Part No. 88M2009-2
Subpanel 5x4 Part No. 88M2019-1
Topside 3x4 Part No. 88M2012-1
Topside 4x4 Part No. 88M2015-1
Topside 5x4 Part No. 88M2018-1
Weatherproof and waterproof your subpanel
and topside mounted keyboards with optional
panel seal gaskets.
Subpanel keyboard gasket is .062" (1,57 mm)
thick; topside keyboard gasket is .094" (2,39
mm).
Material is cellulose fiber, foam, nitrile rubber.
Order gaskets separately from keyboard.
DIM. A
DIM. B
2.710
± .005
(68,83
± 0,13)
3.200
± .005
(81,28
± 0,13)
DIM. C
2.850
± .005
(72,39
± 0,13)
2.500
± .005
(63,5
± 0,13)
DIM. D
Size of Subpanel Mount Topside Mount
Keyboard Dim. A Dim. B Dim. C Dim. D
3x4 2.010 ± .005 2.400 ± .005 1.800 ± .005 2.040 ± .005
(51,05 ± 0,.13) (60,96 ± 0,13) (45,72 ± 0,13) (51,82 ± 0,13)
4x4 2.510 ± .005 2.900 ± .005 2.300 ± .005 2.540 ± .005
(63,75 ± 0,13) (73,66 ± 0,13) (58,42 ± 0,13) (64,52 ± 0,13)
5x4 3.010 ± .005 3.400 ± .005 2.800 ± .005 3.040 ± .005
(76,45 ± 0,13) (86,36 ± 0,13) (71,12 ± 0,13) (77,22 ± 0,13)
INSTANT CUSTOM LEGENDS
Available through Distributors
Create your own legends using these 3 items:
1) a blank keyboard, 2) the clear window
overlays shown on Standard Legend page
and 3) a sheet of legend inserts.
Blank Keyboards
The numbers below order blank keyboards for
the user to legend. For description, refer to the
part numbering scheme below. The keyboards
and overlays are ordered separately.
3x4 Matrix Part No. 88AB2
3x4 SP/Com Bus Part No. 88AC2
4x4 Matrix Part No. 88BB2
4x4 SP/Com Bus Part No. 88BC2
5x4 Matrix Part No. 88JB2
5x4 SP/Com Bus Part No. 88JC2
Legend Insert Sheet and Dry Transfers
Self-adhesive inserts are die-cut to fit the
ORDERING INFORMATION
Grayhill Series Number
Size Option
A = 3x4
B = 4x4
J = 5x4
Circuitry Option
B2 = Matrix code
C2 = Single pole/common bus
88AB2–152 Standard Legend Choices
3x4 Size: -143, -152, or -172
4x4 Size: -052, -072 or -082
5x4 Size: -252 or -262
Available from your local Grayhill Distributor.
For prices and discounts, contact a local Sales
Office, an authorized local Distributor or Grayhill.
button. Legends are printed in black on clear
film in News Gothic Condensed type style.
They include letters A through Z, numbers 0-
69, telephone legends, commonly used words,
symbols and blanks.
Part No. 87AC2046
Use matching dry transfer lettering on blank
inserts of legend sheet: upper and lower case
letters, 0-9, and common symbols.
Small Print Part No. 87-DT-2096-088
Medium Print Part No. 87-DT-2096-125
Large Print Part No. 87-DT-2096-187
Clear Window Overlays
Order separately from keyboards. See also
ordering information.
3x4 Overlay Part No. 88-101
4x4 Overlay Part No. 88-001
5x4 Overlay Part No. 88-201
PRINTED LEGENDS
Not available through Distributors. For
medium volume applications, or where legends
cannot be produced by the self legend method,
you can order epoxy ink printed legends.
Virtually anything which can be photographed
can be printed. Grayhill will print your legend and
then add the clear window overlay.
Type Simulated Character & Line
I.D. No. Style & Size Limitations *
4GH088
1GH125
3GH187
2GH250
ABCDEFGH
ABCDE
ABCD
END
DATA
LAD
ON
15
ABC
D-32
