Grayhill Keypads User Manual

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

STANDARD LEGENDS

Colorful graphic overlays are polyester with a

Keyboards and Keypads

tough acrylic bond to provide maximum
protection against dirt and moisture. Second
surface printed, the overlay wipes clean and

Standard Keypads

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

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

Materials and Finishes

Housing: ABS polycarbonate, black
Graphic Overlay: Polyester
Contact Dome: Stainless steel, selectively gold-

plated
Terminals: Phosphor bronze

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.

-143 -152 -172

-052 -072 -082

-252 -262

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

88-101

88-001

88-201

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.

88AB2,
88AC2

88BB2,
88BC2

88JB2, 88JC2

Keypads

32

Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois 60525-5997 • USA • Phone: [phone] • Fax: [phone] • www.grayhill.com