DUNGS ÜB, NB...A4 - Pressure Limiters for gas, air, flue, exhaust gases and hydrogen

[{"filename":"ub-nb-a4_datasheet_en_214747.pdf","text":"Pressure limiter\n ÜB…A4 and NB…A4\n\n 5.06\n\n\n\n\n Technical description Approvals\n The pressure limiters ÜB…A4 and NB… EC type testing certificate as per:\n A4 are adjustable pressure switches • EC-Gas Appliances Regulation\n as per EN 1854 for automatic burner • EC-Pressure Equipment Directive\n controls.\n They are suitable for switching a circuit Approvals in other important gas-\n on, off or over on changes in actual consuming countries. Special designs\n pressure value relative to the set refer- for the North American market with UL,\n ence value. FM and CSA registrations.\n The reference value (switching point)\n\n\n\n\n Printed in Germany • Edition 01.18 • Nr. 214 747\n is adjusted on a setting wheel provided\n with a scale. Test nipple integrated in\n metal housing as standard.\n\n Application\n Pressure monitoring in firing, ventilation\n and air-conditioning systems.\n Suitable for gases of families 1,2,3 and\n other neutral gaseous media.\n\n1…4\n\fFunctional description ÜB…A4: Switches and locks when the\n 2 NO NB…A4: Switches and 2 locks\n NOwhen the\nSingle-acting pressure limiter in pres- set pressure is exceeded.\n COM COM\n set pressure is undershot.\nsure range.\nThe pressure limiters work without using\nany auxiliary power. 3 switching1function\n ÜB…A4 NC 3\n NB…A4 switching function\n 1 NC\nÜB…A4, NB…A4 pressure limiters As pressure rises\n p\n As pressure falls\nThe control unit responds to pres- p N\n 2 NO closes, 1 NC opens\n Glow lamp ON, locked.\n 2 NO opens, 1 NC closes\nsure. Interlock is performed when the Glow lamp ON, locked.\nset reference value is exceeded or\nundershot.\nThe \"Locked\" switching state is indi- 2 NO 2 NO\ncated by a glow lamp. COM COM\nRestart is only possible by activating\nthe reset button on the setting wheel of 3 1 NC 3 1 NC\nthe pressure limiter after the operating\npressure is attained.\n p N p N\n\n Operating state 2 NO\n COM\nSpecifications 3 1 NC\nMax. operating pressure NB, ÜB 50-150 A4 500 mbar (50 kPa)\n NB, ÜB 500 A4 600 mbar (60 kPa)\nPressure connection Standard: p+ pof housing\n G 1/4 female thread on centre\n N underside\n as per ISO 228: Gas or air\n Optional: p+ additionally G 1/4 female thread on opposite\n measuring connection side: gas or air\nMeasuring connectio Test nipple integrated in metal housing, ø 9\nTemperature range Ambient temperature -15 °C bis +70 °C\n Medium temperature -15 °C bis +70 °C\n Storage temperature -30 °C bis +80 °C\nMaterials Housing base: aluminum die casting\n Hood: Polycarbonate\n Switch: Polycarbonate\n Diaphragms: NBR\n Switching contact: Standard: Ag\n Optional: Ag gold-plated (Au),\n suitable for DDC applications: 24 VDC; 0.02 A\nSwitching voltage Ag contact AC eff. \t\t min. 10 V max. 250 V\n DC \t\t min. 12 V max. 48 V\n Au contact DC\t\t min. 5 V max. 24 V\nNominal current Ag contact AC eff. \t\t 10 A\n Au contact DC \t\t 20 mA\nSwitching current Ag contact AC eff. \t\t min. 20 mA max. 6 A as cos ϕ 1\n DC \t\t min. 24 mA max. 3 A as cos ϕ 0,6\n DC\t\t min. 20 mA max. 1 A\n Au contact DC\t\t min. 5 mA max. 20 mA\nElectrical connection Standard: at screw terminals via PG11 cable gland\n Special design: plug connection for line sockets as per\n DIN EN 175 301-803, 3-pin with protective contact\nDegree of protection IP 54 as per IEC 529 (EN 60529)\nAdjustment In a vertical position\n NB…A4: As pressure falls\n ÜB…A4: As pressure rises\n If installation position deviates, note change in switching point\nSetting tolerance ±15% switching point deviation based on the setpoint and with unit installed in a vertical\n position\nDeviation Permissible deviation of the set value ≤ ± 15 % in the service life test according to EN 1854\n 2…4\n\f Dimensions [mm] ø 2.5 x 9 dia. deep for equipment plug as per DIN EN 175 301-803\n\n\n\n ÜB … A4, NB … A4\n 18,5\n 59,4\n 10,3\n 38,4\n\n\n G 1/4 pressure connection\n Integrated test nipple 76\n ø9 53,75 (LK 76)\n\n Reset button\n Type NB … A4\n option:\n pressure connection\n G 1/4\n 72\n\nÜB 150 A4 [Ag-PG-MS9-V0-VS3] G 1/4\n\n\n\n\n Made in Germany\n Pressure connection\n V0 Pressure connection G 1/4\n Position 0\n V3 Pressure connection G 1/4\n PG11 or\n Position 3\n plug-type connection for cable socket 4 x ø 4,2 21\n SW = Wrench width for M4 screws as per ISO 1207 SW\n Screw plug\n VS0 Screw plug at\n…