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I 1 1 11 1 I 1 of hardcopy accountability of monitor status and EPA required inventory reports. The Series X76 LVC portion is designed to monitor liq- uid level, vapor density, pressure and hydrostatic pressure. The system gererates an alarm and may shut down specific facilities if preset parameters are exceeded. The microprocessor based system provides visual and audible alarms, self-diasgnostics and sensor failure indication, fail-safe shutdown and auxiliary switch outputs for communications to a facility's remote displays. The liquid level sensors will indicate presence of liquids in the annular space of double-wall tanks, secondary containment pipes, manhole of caisson compartments and in -tank high level to prevent over- fill. The vapor density, measured by the product's unique vapor transducer, is indicated on the appropriate plug- in module in parts per million (ppm) by means of a 4 1/2 digit LED display. The display not only indicates the initial background vapor density in a vadose well or the annulus of any secondarily contained vessel. but also monitors an increasing trend of vapor den- sity. The self-contained display also provides the ability to set the alarm and shutdown setpoints without additional calibration equipment. The pressure measurement utilized to monitor pres- surized supply piping reads the pressure decay caused by a leak rate greater than 0.05 GPH occur- ring between automatic test cycles (every 30 minutes). A hydrostatic measurement is applied to the annulus of a double-wall tank by detecting a loss of pressure in the pressurized cavity or the loss of liquid level in a reservoir or the annulus of the tank. The X76 ETM System, housed in an attractive wall mounted NEMA Type 1 Enclosure, contains the intrin- sically safe barrier interface to the transducer, a num- ber of three channel alarm modules, vapor modules, and/or dispenser modules. The front door mounted audible alarm and the flashing alarm lights are ac- knowledged by the ACK button and functionally tested by means of the TEST push button. 3.0 SITE PREPARATION WARNING: Take necessary precautions to prohibit vehicles from entering the working area during installation or service. WARNING: During installation and use of this product, comply with the National Electrical Code, federal, state and local codes, and any other ap- plicable safety codes. Failure to comply with these warnings could result in serious personal injury, property loss and equipment damage. 3.1 Probe Riser Pipe Installation See Installation Drawing for dimensions and in- stallation requirements. A. For maximum height to volume conversion ac- curacy, use one of the threaded bushings closest to the center of the tank and install a 4" riser pipe (Ansi pipe Sch. 40). The top end of the riser pipe should be threaded to accept a four inch N.P.T., an 950 adapter, and a 950 locking cap with watertight cable grip, which are supplied with the probe. Insert a 4" diameter riser pipe; install adaptor and cap. B. If the tank is buried, excavate the portion con- taining the tank hole to be used. Remove the plug from the hole and insert the riser pipe as described above. Note: Be sure there is enough clearance be- tween the top of the riser and the bottom of the manhole cover to allow room for the two -wire cable supplied with the probe. 3.2 Manhole Installation Install an #967 square manhole at each probe location. Offsetting the probe riser will allow added ease in junction box installation. 3.3 Conduit Location WARNING: Probe to controller conduit must not exceed 2,500 feet. See Installation Diagram cable notes for proper wiring re- quirements. Runs over 2,500 feet are not U.L. approved for this application. Refer to the X76 LVC Installation and Operating manual for sensor limitations. WARNING: Explosion may occur if the con- troller is installed in a volatile, combustible or explosive atmosphere. Failure to comply with these warnings could result in serious personal injury, property loss and equipment damage. (Refer To Installation Drawing) A. Select a mounting location on the inside wall of an enclosed building that allows easy ac- cess to the controller. When selecting a loca- tion, consider the entry path of the probe wire conduit from the underground tanks to the con- troller. The controller should be located with the LCD at eye level. B. Run a 3/4" rigid metal conduit between the breaker box and the X76 ETM controller for the power wire input. If a plug connector is