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Optional Accessories and piping. Do not use more thereby completing the elec- For Hydrostatic Tank than 75% glycol. trical sensing circuit (normally Monitoring closed). If the reservoir liquid level drains and exposes the Freeze Glycol Mixture sensor probes, an alarm will Protection (with water) sound at the electronic 20°F 200/, control panel. 0°F 30% –20°F 40% Reservoir Sensor –40°F 50% Model RS 10A Shown Water Paste Detection To detect water in the tank bottom, water detection paste CRISER STABLE is available from petroleum CABLE equipment distributors. How- I CONDO r ever, some water detection paste cannot detect antifreeze HIGH LIauIDPIPE CAPmixtures. If antifreeze mix- LEVELIIOLEStures are used for the cavity SWITCHRISERPIPE Antifreeze Mixtures monitoring fluid, the following FITTING O/C TANKS recommends product is capable of detecting 1I and supplies the Hydrostatic water or antifreeze (brine or INTERNALLY THREADED Tank Monitor for use with up to 50% glycol) solution in Fiberglas® double-wall tanks the tank water bottoms: PERFORATED (Models DWT-2P and DWT- WATER FINDER LOW LIQUID PLASTIC CASING 4P). If the Hydrostatic Tank #7686-1870 SWITCH Monitor is used in areas of DAYCO/NATIONAL the country where ambient DAYTON, OHIO temperatures or delivered product temperatures may Fiberglas Reservoir Sensor subject the tank to freezing All Model DWT-2P and DWT- The reservoir sensor is also i conditions, an antifreeze 4P tanks include a Fiberglas equipped with a high-level solution must be used to reservoir mounted on the tank float switch that will generate avoid potential tank damage. top as a standard feature. an alarm condition for an outer- Oma( After filling with liquid, the wall leak in a high groundwater Brine Antifreeze Solution level in the Fiberglas reservoir condition. As an optional accessory, may be monitored periodically O/C TANKS can supply a cal- by using a dipstick or contin- To prevent the intrusion of cium chloride solution which uously by using the optional groundwater into the reservoir is pre-mixed and blended to reservoir sensor, in conjunction for extreme high groundwater provide freeze protection to with an optional electronic conditions, the factory-drilled –40°F. control panel. vent holes in the PVC riser pipe top must be plugged and a Glycol Antifreeze The monitoring sensor is separate vent line installed Solutions placed into the Fiberglas from the riser pipe to above A mixture of water and either reservoir through a 4" riser grade. In addition, the PVC ethylene glycol or propylene pipe (6" diameter for 10, riser pipe top should be glued glycol (contractor provided) diameter tanks) from grade. to the riser pipe fitting. is an alternate to provide pro- The sensor includes the riser tection against freezing. Local pipe cap with a 16" length of environmental codes should flexible conduit, which is con- be reviewed for chemical nected to an electrical junction acceptability—particularly box (contractor supplied). The if ethylene glycol is used. reservoir sensor has sufficient cable length for a maximum A minimum of 30% ethylene tank burial depth of 101 from glycol or 35% propylene the tank top to grade. glycol and water solution is recommended. At or above The reservoir sensor operates these minimum glycol con- on the principle of conductance centrations, an antifreeze to detect the presence of liquid mixture which freezes will in the Fiberglas reservoir. contract in volume, thus Under normal conditions, the preventing damage to the titanium metal probes will be monitoring components, tank immersed in the liquid media,