Model 717 • Displacer Switch, Top Inserted, Three Point Features Top inserted Two alarm points Three switching station displacers Displacer weight is supported by a spring High and/or low alarm Single and multiple pump control Description The Delta Controls Model 717 Displacer Switch has two alarm points, three switching stations and three displacers. A precise on/off action occurs in the appropriate switch station when the liquid level surface passes the elevation of the related displacer element. The Delta Controls Model 717 is commonly used to control two pumps acting to empty a sump. Each of the two top displacers starts a pump; the lower displacer operates a DPDT switch, which acts to stop both pumps at the same place. Latch/unlatch pump starters are normally used in this arrangement. Options: The Model 717 Option D utilizes an adjustable differential device has been added, and only two switch stations are utilized. The lower switch station is activated when the liquid surface covers the middle displacer and stays activated until the liquid level falls below the bottom displacer. A typical application is to control a single pump with a high or low level alarm. Model 717 Specifications Available Wetted Materials: Insertion (Below Process Connection): Switch Action: Specific Gravity: Temperature Range: Pressure Range: Threaded Connection: Flanged Connection: Flange Rating: Certifications: Third Party Listed by CSA NRTL/C (USA and Canada) Class I, Division 1, Groups B, C and D; Class II, Division 1, Groups E, F and G; Class III, Division 1 Class I, Zone 1, Ex d IIB+H2 Class I, Zone 1, AEx d IIB+H2 316 Stainless Steel, carbon steel ≤ 50 ft max 1 to 4 points of alarm and/or differential 0.55 to 1.45 -20 °F to +500 °F (-29 °C to +260 °C) -15 psig to +2200 psig (1 bar to +151.6 bar) 3.0 in to 8.0 in NPT 3.0 in to 12 in ≤ 300 lb ANSI flanges or Grayloc® DIN or JIS equivalents hub 158 | Mechanical > Model 717 | deltacnt.com