Datasheet Content
[{"filename":"gao-gml-gmh-a2_datasheet_us_226359.pdf","text":"Gas Pressure Switch\n for DMV safety shutoff valves\n\n GAO-A2…\n GMH-A2…\n GML-A2…\n\n\n\n\n UL Listed\n • UL 353\n • File # MH 16628\n\n CSA Certified\n • CSA C22.2 No. LR 53222\n • File # 201527\n\n FM Approved\n • Class 3510, 3530\n • File # J.I. 1Y9A9.AF\n\n Commonwealth of Massachusetts\n Approved Product\n • Approval code G3-0106-191\n • Gas pressure switch\n\n Codes and Standards\n This product is intended for instal-\n lations covered by but not limited to\n NFPA 85, NFPA 86, UL 795, CSD-1,\n ANSI Z83.4, ANSI Z83.18, ANSI\n Z21.13, CSA B149.1, CSA B149.3 and\n CSA B149.6.\n\n DUNGS is an ISO 9001 Description Application\n manufacturing facility. The GAO-, GMH-, and GML-A2… pres- The GAO-, GMH-, and GML-A2…\n sure switches are compact, ventless gas pressure switches are recommended\n pressure switches for modular valve train for industrial and commercial heating\n components. applications with DMV dual modular\n valves, SV safety valves, MBC, MBE\n These pressure switches are suitable for multifunctional controls, and FRI modu-\n making and/or breaking a circuit when lar pressure regulators. Various mount-\n the medium pressure changes relative ing options allow direct mounting on the\n to the set point. The set point can be set valve housing.\n\n\n\n\n Gxx-A2 Sales Brochure • P/N 226359 • Ed. 10/23\n in the field by an adjustable dial with an\n integrated scale. The switches incor- The GAO-, GMH-, and GML-A2… pres-\n porate a vent limiter as per UL 353 and sure switch is suitable for dry natural\n limits the escape of gas less than 1.0 gas, propane, butane, air and other\n CFH of natural gas at 7 PSI if internal inert gases. Suitable for up to 0.1 % by\n switch diaphragm ruptures. volume, dry H2S.\n\n A “dry” gas has a dew point lower than\n +15 °F and its relative humidity is less\n than 60 %.\n1…7\n\fGAO-A2… SPDT pressure switch requires no auxiliary power to actuate. The GAO-A2… is suitable for making and/or\nbreaking a circuit when the set point is exceeded or undershot. A tripped switch is indicated by a neon light after set point\nis exceeded or undershot. Automatic reset when pressure returns below or above set point.\n\nGMH-A2… SPDT pressure switch requires no auxiliary power to actuate. The GMH-A2… is suitable for making and/or\nbreaking a circuit when the set point is exceeded. A tripped switch (only NEMA Type 4) is indicated by a neon light after\nset point is exceeded.Manual reset is required to reset the switch.\n\nGML-A2… SPDT pressure switch requires no auxiliary power to actuate. The GML-A2… is suitable for making and/or\nbreaking a circuit when the set point is undershot. A tripped switch (only NEMA Type 4) is indicated by a neon light after\nset point is undershot.Manual reset is required to reset the switch.\n\nSpecifications\nMax. operating pressure GAO-A2-4-2,3,5,6 7 PSI (500mbar)\n GMH- and GML-A2-4-4,6 7 PSI (500mbar)\n GAO-, GMH- and GML-A2-4-8 14 PSI (1000 mbar)\nPressure connection O-ring flange connection on underside of pressure switch\nTemperature range:\nFor series ending in -2,-3,-5, and -6 Ambient temperature -40 °F to +140 °F (-40 °C to +60 °C)\n Medium temperature -40 °F to +140 °F (-40 °C to +60 °C)\nFor series ending in -8 Ambient temperature -22 °F to +140 °F (-30 °C to +60 °C)\n Medium temperature -22 °F to +140 °F (-30 °C to +60 °C)\nMaterials Housing Aluminium\n Switch Polycarbonate\n Diaphragm NBR-based rubber\n Switching contact Silver\nElectrical ratings AC eff.\t\t min. 24 V max. 240 V\n DC \t\t min. 24 V max. 48 V\nNominal current ratings Silver (Ag) contact ratings\t\t\n AC 10 A resistive @ 120 VAC\n AC 8 A pilot duty @ 120 VAC\n DC min. 20 mA @ 24 VDC\n DC max. 1 A @ 24 - 48 VDC\t\t\nIndication light (NEMA 4 versions) Energy consumption\n 0.1 W max. @ 120 VAC\n 0.5 W max. @ 24 VDC/AC\nElectrical connection Screw terminals via 1/2\" NPT conduit connection\nEnclosure rating NEMA 1 or NEMA 4\nSetting tolerance ±15% switching point deviation referred to set point. Adjusted as pressure rises or\n as pressure falls, vertical diaphragm position.\nVent Limiter Incorporates a vent limiter as per UL 353 and limits the escape of gas less than 1.0\n CFH of natural gas at 7 PSI if internal switch diaphragm ruptures.\n\n\nGAO (Shown as a high gas limit) GMH (Operating state shown) GML (Operating state shown)\nAs pressure rises above set point, As pressure rises, 2 NO closes, As pressure falls, 2 NO opens, 1 NC\n1 NC opens, 2 NO closes, Neon light 1 NC opens, and Neon light ON (fault), closes, Neon light ON (fault), switch\nON (fault). As pressure falls below switch trips and locks out. trips and locks out.\nsetpoint, switch resets: 1 NC closes\nand 2 NO opens, Neon light off.\n\n\n\n\n O (orange) O (orange)\n O (orange) Medium NE (neon) Medium NE (neon)\n Medium NE (neon) Pressure Pressure\n Pressure NEMA 4 NEMA 4\n NEMA 1 no light installed NEMA 1 no light installed 2…7\n\f Dimensions inch (mm)\n GAO-, GMH-, GML-A2…\n\n\n\n\n Through hole\n 4 x 0.16 (4,2)\n\n\n\n\n Reset button\n GMH-A2...\n GML-A2... Slot for O-ring\n\n\n\n NEMA 1\n cover has\n 20 mm cutout\n\n\n\n\n NPT 1/2”\n conduit connection\n\n\n\n Adapters / Replacement parts / Order No. For equipment Notes\n Accessories\n A2 Mounting kit (included with switch) 226188 GAO, GMH, GML M4 Screws, 10.5 x 2.25 O-ring\n DMV & MBC Port 3 adapter 273777 DMV-D(LE) 701 - 703 NPT 1/2“ - NPT 2“\n (side mount for high pressure switch MBC series 1000 - 4000\n Replacement conduit adapter 220566 GAO, GMH, GML PG 11 to 1/2“ NPT adapter\n Replacement conduit adapter 240671 GAO, GMH, GML M 20 to 1/2“ NPT adapter\n NEMA 4 Replacement cover 228732 GAO\n 233113 GMH, GML\n NEMA 1 Replacement cover 298234 GMH, GML\n Screw for replacement…
