Thermal power plants, nuclear power plants, geothermal power plants, waste incineration facilities, oil refineries, chemical plants, ships, etc. Product Features Basic Specifications ■Major Customers Main type NS287-71, 74, 81, 91 (direct-acting type, for high pressure and high temperature) NS287-81D, 82D, 83D, 84D, 85D (Displacement and depth-measuring type) Water, drain, seawater, oils, LPG, LNH3, etc. VAC to 9.8 MPa –45 °C to 310 °C (470 °C with forced cooling mechanism) 0.65 to 1.05 1B socket weld or 25A flange 1 × SPDT or 2 × SPDT (equivalent to DPDT) Type 71 and 81: ±5, type 74: ±7, type 91: ±10 Carbon steel or stainless steel (nylon coating for seawater applications) Stainless steel or titanium (Teflon coating for seawater applications) Water, drain, seawater, oils, LPG, LNH3, etc. VAC to 9.8 MPa –45 °C to 310 °C (470 °C with forced cooling mechanism) 0.65 to 1.05 1B socket weld or 25A flange 1 × SPDT or 2 × SPDT (equivalent to DPDT) Type 71 and 81: ±5, type 74: ±7, type 91: ±10 Installation example Liquid to be measured Pressure range Temperature range Speci c gravity range of liquid to be measured Connection and bore size Contact con guration Accuracy (mm) Contact capacity Housing Structure Body Material Float Material ・AC type (AC 125 or 250 V, 15 A / DC 125 V, 0.5 A; DC 250 V, 0.2 A; resistive load) ・DC type (DC 125 V, 10A; DC 250 V, 3 A / AC 125 V, 3 A; AC 250 V, 0.75 A; inductive load) ・Waterproof structure, JIS C 0903 water-resistant type conformity (NEMA4 equivalent, IP65 equivalent) ・Explosion-proof structure, TIIS d2G4 (equivalent to NEMA 7 and 9: waterproof structure to withstand outdoor use). •Excellent Heat Resistance The maximum operating temperature is 310 °C due to the temperature reduction mechanism using Nakakita's unique labyrinth ring (350 °C when convection occurs at an ambient temperature of 60 °C or lower). •High Pressure Resistance The main body and oat are guaranteed to be pressure resistant with basic capacity to withstand high pressure and high temperatures of 310 °C and 9.8 MPa, as well as reliable manufacturing technology. •Ease of Maintenance Unitized design provides simple structure and easy maintenance. •Explosion-proof Products Our level switches are Ministry of Health, Labor and Welfare (Technology Institution of Industrial Safety) certi ed. •High Earthquake Resistance The switch unit, which employs a double magnet system, does not malfunction even when subjected to 3G horizontal and 1G vertical vibration. •SCC-resistant Measures High reliability is ensured by SCC-resistant materials and superior manufacturing technology (SCC: stress corrosion cracking). •Easy Adjustment Setting levels can be easily adjusted with the switch unit. •Officially Approved Products Our level switches have passed unmanned shipboard equipment environmental tests conducted by classi cation societies (LR, DNV, NK, etc.). 18 NAKAKITA FCV PRODUCT CATALOG
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