Grayhill Keypads 88 Series - Manual (Page 4)

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: Phosphor bronze
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.
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