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88AC2-143 Datasheet(PDF) 4 Page - Grayhill, Inc |
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88AC2-143 Datasheet(HTML) 4 Page - Grayhill, Inc |
4 / 5 page Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois 60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com Sealed 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 Keypads 35 |
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