micro-measurements@vishay.com embedment gages vishay micro-measurements document number: 11526 revision 03-sep-03 www.vishaymg.com 107 special purpose sensors - embedment gages the egp-series embedment strain gage is specially designed for measuring mechanical strains inside concrete structures. the sensing grid, constructed of a nickel-chromium alloy (similar to karma), has an active gage length of 4 in (100 mm) for averaging strains in aggregate materials. a rugged 5-in (130-mm) outer body of proprietary polymer concrete resists mechanical damage during pouring, minimizes reinforcement of the structure, and provides protection from moisture and corrosive attack. the grid, cast within the polymer concrete to ensure maximum strain sensitivity, is self-temperature-compensated to minimize thermal output when installed in concrete structures. each gage incorporates a heavy-duty 10-ft (3-m) cable with 22-awg (0.643-mm dia.) leadwires; a three-wire construction to the sensing grid helps minimize temperature effects in the instrumentation leads. special lengths of preattached cable will be quoted upon request. vishay micro-measurements m-line accessory cable 322-djv is available for adding cable length in the field. rugged and reliable, egp-series strain gages are available in both 120-ohm (egp-5-120) and 350-ohm (egp-5-350) resistances. specifications ? construction. strain sensing grid cast in a sturdy, water-resistant material. ? sensing grid. nickel-chromium alloy on polyimide backing. active gage length of 4 in (100 mm) nominal. grid resistance of 120 or 350 ohms, 0.8%. ? outer body. proprietary polymer concrete. 5 x 0.7 x 0.4 in (130 x 17 x 10 mm) nominal. ? cable. three 10-ft (3-m) leads of 22-awg (0.643-mm dia.) stranded tinned copper in 0.015-in (0.4-mm) thick pvc insulation. nominal cable diameter of 0.2 in (5 mm). (other lengths quoted upon request.) ? temperature range. the normal usage range is +25 to +125 f (C5 to +50 c). extended range is C25 to +150 f (C30 to +60 c). embedment gage selection gage designation res. active outer outer outer in gage body body body ohms length width length thickness egp-5-120 120 0.8% 4 0.7 5 0.4 100 17 130 10 egp-5-350 350 0.8% 4 0.7 5 0.4 100 17 130 10 dimensions
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