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Veeder-Root Sensor Application Guide Discriminating Interstitial Sensor for Double -Wall Fiberglass Tanks The Discriminating Interstitial Sensor for double-wall fiberglass tanks uses solid-state liquid level sensing technol- ogy to detect liquid in the interstitial space of the tank. The sensor can differentiate between hydrocarbons and other liquids. An open sensor triggers a Sensor Out alarm. Table 8. Discriminating Interstitial Sensor for Double -Wall Fiberglass Tanks Features and Console Compatibility Item Description Form Number 794380-343 (includes 25 ft [7.6m] cable; for 4 -10 ft [1.2 to 3m] I.D. fiberglass tanks) Operating principle Optical sensor and conductivity Product activation height' Gasoline <0.1 inch (0.25cm); Water <0.1 inch Operating temperature: 14 to +140°F (-10 to +60°C) Dimensions 4.3" (11cm) length, 1.5" (3.8cm) width, 0.5" (1.3cm) thick Compatible consoles TLS-450/TLS-450PLUS, TLS4/8601 Series, TLS -350 Series Console Interface Module TLS -350 Series - Type A Sensor Interface Module, 8 sensor input, P/N 329956-001 TLS-450/TLS-450PLUS - Universal Sensor Module (USM), 16 sensor input, P/N 332812-001 TLS4/8601 Series - Universal Sensor Input Output Module (USIOM) (AC ver.), 12 sensor input, P/N 333238-001; (AC ver.), 6 sensor input, P/N 333238-002; (DC ver.), 12 sensor input, P/N 333238-003; (DC ver.), 6 sensor input, P/N 333238-004 Maximum number of sensors monitored per console TLS -350 Series (64) TLS-450/TLS-450PLUS(32) TLS4/8601 Series (12) Compatible fuels 10096 Gasoline and blends with up to 1546 Ethanol; Diesel; Bio -Diesel; Kerosene; Jet fuel; Aviation Gas; Waste Oil; Motor Oil 'For additional third party evaluation data of Standard Types see: http://nwglde.org/evals/veeder_root_u.html Miscellaneous • Installation example (see Fig. 6) 1/2" NPT Cord grip Seal -off Manhole Rigid conduit (to Console) Weatherproof junction box Riser Sensor must reach bottom otank Fiberglass tank off i