Datasheet Content
[{"filename":"ggw-a4_datasheet_en_215168.pdf","text":"Differential pressure\n switches for gas, air, flue\n and exhaust gases\n\n GGW…A4\n GGW…A4-U\n GGW…A4/2\n GGW…A4-U/2\n 5.03\n\n\n\n\n Technical description non-ferrous metals, suitable for gases\n The differential pressure switch GGW… of up to max. 0.1 vol % H2S, dry.\n A4 is an adjustable gas-differential\n pressure switch as per EN 1854 for Certifications\n automatic burner controls. It is suitable EC type testing certificate as per:\n for switching a circuit on, off or over • EC-Gas Appliances Regulation\n on changes in actual pressure value • EC-Pressure Equipment Directive\n relative to the set reference value. The\n reference value (switching point) is ad- Pressure switches class \"S\" as per\n\n\n\n\n Printed in Germany • Edition 2024.01 • Nr. 215 168\n justed on a setting wheel provided with EN 1854.\n a scale. The test nipple is integrated in\n metal housing as standard. Approvals in other important gas-\n consuming countries.\n Applications\n Differential pressure switch in furnace,\n ventilation, and air conditioning appli-\n cations. Differential pressure switch:\n Suitable for employment with gas\n family 1, 2, 3, and other, neutral, gas-\n eous media as well as air, smoke and\n1…6 exhaust gases. It does not contain any\n\fFunction Unit selection The pressure connetion G 1/8 may not\nDifferential pressure switch operat- If the lower pressure is [G 1/8 (-)] be closed.\ning in the over- and under-pressure excess pressure with respect to the\nranges. The differential pressure acts atmosphere exists type GGW…A4 Low pressure switch GGW...A4-U\non the membrane, pressing it against must be employed. Pressure connection G 1/8\nthe force of the adjusting spring and If the lower pressure is [G 1/8 (-)], lower Single-acting pressure switch in the un-\nagainst the microswitch. The pres- pressure with respect to the atmos- derpressure range.\nsure switch operates without outside phere exists type GGW…A4-U must The switching mechanism responds if\npower. be employed. there is a low pressure which switches\n on, off or over to an electric circuit if\nDifferential pressure switch Overpressure switch GGW...A4 the set reference value is exceeded or\nGGW…A4 and GGW…A4-U Pressure connection G 1/4 (+) undershot.\nThe switching apparatus reacts to the Single-acting pressure switch in the over- The pressure connetion G 1/4 may not\ndifference in pressure between the two pressure range. be closed.\npressure chambers [G 1/4 (+) <-> G The switching mechanism responds if\n1/8 (-)] and, if the pressure exceeds or there is an overpressure which switches\ndrops below the setpoint, activates or on, off or over to an electric circuit if\nswitches an electrical circuit. the set reference value is exceeded or\n undershot.\n\n\n Switching function Definition of switching difference ∆p\n The switching difference ∆p is the\n As pressure rises: pressure difference between the upper\n 1 NC opens, 2 NO closes. and lower switching pressures.\n As pressure falls:\n 1 NC closes, 2 NO opens.\n\n Pressure\n at meter\n Setting tolerance\n Upper switching\n 2 NO pressure\n\n\n\n\n Switching difference, ∆p\n COM\n Falling\n 3\n 1 NC Adjustment as\n p Rising Lower\n\n pressure falls\n switching\n pressure\n\n\n\n 2 NO\n COM\n 3 Design: Clear\n GGW…A4, 1 NC\n cover\n Protection class: IP 54\n\n \t\t5 Protection against ingress of solid particles ø ≥ 1 mm.\n pProtection\n N against access to hazardous parts using ø ≥ 1 mm wire\n IP 54 Complete contact protection\n\n 2 NOagainst a water jet.\n \t\t4 Protection\n COM No hazardous conditions may result.\n\n 3 1 NC\n GGW…A4/2, Design: Metal housing\n Protection class: IP 65\n p 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) from\n \t\t any directions\n No hazardous conditions may result (water jet).\n 2…6\n\f Technical specifications\n\n Max. operating pressure GGW 3 A4 - GGW 150 A4 \t\t 0...500 mbar (50 kPa)\n GGW 3 A4/2 - GGW 150 A4/2\t\t 0...500 mbar (50 kPa)\n\n GGW 3 A4-U - GGW 150 A4-U 0...-500 mbar (-50 kPa)\n GGW 3 A4-U/2 - GGW 150 A4-U/2 0...-500 mbar (-50 kPa)\n\n Pressure connection P+: In the center of the underside of the housing, G 1/4 internal thread in ac-\n cord. with ISO 228: Gas or air.\n P+: On the side of the housing with closure screw, G 1/4: Gas or air\n P-: On the side of the underside of the housing, G 1/8 internal thread in ac-\n cord. with ISO 228: Gas or air.\n\n Metering connection Metering connection tube integrated into the 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 GGW…A4\n Housing base\t\t aluminium die casting\n Cover\t\t\t Polycarbonate\n Switch portion\t\t Polycarbonate\n Membrane\t\t NBR\n Switch contact\t\t Ag gold-plated (Au)\n \t\t\t suitable for DDC applications: 24 VDC; 0.01 A\n\n GGW…A4/2\n Housing base \t\t aluminium die casting\n Cover \t\t\t Zinc diecast, powder-coated\n Switch portion \t\t Polycarbonate\n Membrane\t\t NBR\n Switch contact\t\t Ag gold-plated (Au)\n \t\t\t suitable for DDC applications: 24 VDC; 0.01 A\n\n Switching voltage DC min. 5 V max. 24 V\n (AC eff. min. 24 V max. 250 V)\n (DC min. 24 V max. 48 V)\n\n Nominal current DC 20 mA\n (AC eff. 10 A)\n\n Switching current DC min. 5 mA max. 20 mA\n (AC eff. min. 20 mA max. 6 A cos ϕ 1)\n (AC eff. min. 20 mA max. 3 A cos ϕ 0,6)\n (DC min. 20 mA max. 1 A)\n\n Electrical connection Standard at screw terminals via cable gland, M20 x 1,5\n\n Special design plug connection for line sockets as per\n DIN EN 175 301-803, 3-pin with protection contact\n\n Degree of protection GGW…A4 IP 54 in accord. with IEC 529 (EN 60529), (clear cover).\n GGW…A4/2 IP 65 in accord. with IEC 529 (EN 60529), (metal housing).\n \t\t\t\t\n Adjustment With rising pressure and installed in a vertical position.Optional rising or dropping\n pressure adjustment on-site possible. Note switch point change if installation\n position changes.\n\n Adjustment tolerance…
