Datasheet Content
[{"filename":"lgw-a4_datasheet_en_223839.pdf","text":"Differential pressure\n switches for air, flue\n and exhaust gases\n Pressure switch for gas\n\n\n LGW…A4\n LGW…A4/2\n 5.08\n\n\n\n\n Technical description Approvals\n The differential pressure switch LGW… EU type testing certificate as per:\n A4 is an adjustable differential pressure • EU-Gas Appliances Regulation\n switch as per EN 1854 for automatic • EU-Pressure Equipment Directive\n burner controls.\n It is suitable for switching a circuit on, off or Pressure switch Class \"S\" as per EN 1854.\n over on changes in actual pressure value\n relative to the set reference value. Approvals in other important gas-\n The reference value (switching point) consuming countries.\n Printed in Germany • Edition 2022.06 • Nr. 223 839\n\n\n\n\n is adjusted on a setting wheel provided\n with a scale.The test nipple is integrated\n in metal housing as standard.\n\n Application\n Differential pressure monitoring in firing,\n ventilation and air-conditioning systems.\n Differential pressure switches: suitable\n for air, flue and exhaust gases.\n Pressure switches: suitable for gases of\n families 1,2,3 and other neutral gase-\n1…6 ous media.\n\fFunctional description Overpressure switch LGW…A4 Vacuum switch LGW…A4\nDifferential pressure switch in pressure Pressure connection G 1/4 Pressure connection G 1/8\nand vacuum ranges. The differential Single-acting pressure switch in the Single-acting pressure switch in the\npressure acts via the diaphragm against overpressure range. low pressure range. The switching\nthe force of the setting spring on the The switching mechanism responds if mechanism responds to vacuum which\nmicroswitch.The pressure switch oper- there is an overpressure which switch- switches an electric circuit on, off or\nates without any auxiliary power. es on, off or over to an electric circuit over when the set reference value is\n if the set reference value is exceeded exceeded or undershot.\nDifferential pressure switch or undershot. The pressure connection G 1/4 may\nLGW…A4 The pressure connection G 1/8 may not be closed.\nThe switching mechanism responds not be closed.\nto differential pressure which acts\nbetween the two pressure chambers.\nIt switches an electric circuit on, off or\nover when the set reference value is\nexceeded or undershot.\n\n\n\n\n LGW…A4 switching function Definition of switching difference ∆p\n The switching difference ∆p is the pres-\n As pressure rises:\n sure difference between the upper and\n 1 NC opens, 2 NO closes\n lower switching pressures.\n As pressure falls:\n 1 NC closes, 2 NO opens\n\n\n Pressure at\n meter\n Setting tolerance\n 2 NO Upper switching\n COM pressure\n Switching difference, ∆p\n\n\n\n\n 3\n\n\n\n Falling\n 1 NC\n Adjustment as\n\n\n\n\n p\n pressure falls\n\n\n\n\n Rising\n Lower\n switching\n pressure\n\n 2 NO\n COM\n 3 1 NC\n LGW…A4, Design: Clear cover\n Protection class: IP 54\n p\n N against ingress of solid particles ø ≥ 1 mm.\n \t\t5 Protection\n Protection against access to hazardous parts using ø ≥ 1 mm wire\n IP 54 Complete contact protection\n 2 NO\n COM Protection against a water jet.\n \t\t4\n No hazardous conditions may result.\n 3 1 NC\n\n LGW…A4/2, Design: Metal housing\n p IP 65\n Protection class: N\n \t\t6 Protection against the entry of dust (dust sealed).\n Protection against access to hazardous parts using ø ≥ 1 mm wire\n IP 65 Complete contact protection\n\n \t\t5 Protection against a water jet from a nozzle directed at the unit (housing)\n \t\t from any directions\n No hazardous conditions may result (water jet).\n 2…6\n\f Specifications\n\n Max. operating pressure LGW 3 A4 - LGW 150 A4 500 mbar (50 kPa)\n LGW 3 A4/2 - LGW 150 A4/2 500 mbar (50 kPa)\n\n Pressure connection P+: G 1/4 female thread ISO 228 on centre of housing underside: gas or air\n P+: G 1/4 screw plug on side of housing: gas or air\n P-: G 1/8 female thread ISO 228 on side of housing underside: only air\n\n Measuring connection Instrument gland integrated in metal housing, ø 9\n\n Temperature range Ambient temperature: -15 °C to +70 °C\n Medium temperature: -15 °C to +70 °C\n Storage temperature: -30 °C to +80 °C\n\n Materials LGW…A4\n Housing base \t\t aluminum die casting\n Hood\t\t\t Polycarbonate\n Switch \t\t Polycarbonate\n Diaphragms\t\t NBR\n Switching contact Standard: Ag\n \t\t\t Optional: Ag gold-plated (Au),\n \t\t\t suitable for DDC applications: 24 VDC; 0.02 A\n\n LGW…A4/2\n Housing base \t\t Diecast aluminum\n Hood\t\t\t Extrusion cast zinc, powder-coated\n Switch \t\t Polycarbonate\n Diaphragms\t\t NBR\n Switching contact Standard: Ag\n \t\t\t Optional: Ag gold plated (Au),\n \t\t\t Suitable for DDC applications: 24 VDC; 0.02 A\n\n Switching voltage Ag contact AC eff. min. 24 V max. 250 V\n DC min. 24 V max. 48 V\n Au contact DC min. 5 V max. 24 V\n\n Nominal current Ag contact AC eff. 10 A\n Au contact DC 20 mA\n\n Switching current Ag contact AC eff. min. 20 mA max. 6 A bei cos ϕ 1\n AC eff. min. 20 mA max. 3 A bei cos ϕ 0,6\n DC min. 20 mA max. 1 A\n Au contact DC min. 5 mA max. 20 mA\n\n Electrical connection Standard at screw terminals via M20 x 1.5 cable gland\n\n Special design plug connection for line sockets as per\n \t\t DIN EN 175 301-803, 3-pin with protection contact\n\n Degree of protection LGW…A4 IP 54 as per IEC 529 (EN 60529), (transparent hood)\n LGW…A4/2 IP 65 as per IEC 529 (EN 60529), (metal housing)\n \t\t\t\t\n Adjustment If pressure increases in vertical installation position.\n Optionally adjustment for rising or falling pressure possible on site.\n If installation position deviates, note change in switch point.\n\n Setting tolerance ±15% switch point deviation referred to reference value and installation in vertical\n position. Optionally, rising (Ç) or falling (È) adjustment possible on site.\n\n Deviation Permissible deviation of the set value ≤ ± 15 % in the service life test according\n to EN 1854\n\n Reference value setting device Standard: blue\n Version \"Y\": Yellow\n3…6\n\fDimensions [mm]\n\nLGW… A4\n…
