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® 111.1. ENCLOSURE MOUNTING <br />The enclosure is equpped with four 5/16" dia mounting holes. Select a vertical wall <br />or instrument panel free from water splash or dust collection for the enclosure <br />mounting. <br />For future inspection and service purposes, a junction box should be used to <br />terminate the sensor cable above the monitoring well or the tank riser. Size of the <br />junction box should be 3/4" NPT or larger, to allow the sensor housing to be <br />removed freely when service is needed. <br />Because of its small size, the sensor can be adapted to almost all well sizes and tank <br />gap spacing. Also, because of its light weight, the sensor can be supported by its own <br />cable alone without need of any additional mounting attachment. <br />The liquid sensor should be placed close to the lowest point within the space to be <br />monitored, so as to respond to the early leakage condition. <br />The vapor sensor can be placed arbitrarily within the probing space due to the fact <br />that the vapor will diffuse and occupy the space uniformly under stagnant conditions. <br />However, to avoid potential direct contact with the liquid in case of large leakage, it <br />is recommended that the vapor sensor be installed at least a few feet above the <br />bottom of the well or tank. <br />AML <br />111.3. HOME RUN CABLE <br />The transmission between the junction box and the electronic enclosure is facilitated <br />with home run cable; it can be a PVC -jacketed cable installed inside an electric <br />conduit, or a certified direct burial cable. An 18 -AWG wire size cable can be used for <br />distance up to 1000 ft. A larger wire size cable must be used if the home run <br />distance exceeds 1000 ft. <br />The factory supplied conduit cable is a four -conductor 18 -AWG cable with red, white, <br />green, and black color code. <br />111.4. CHANNEL PC CARD <br />In most cases, the channel PC cards are installed at the factory. When field service is <br />needed, the PC cards can be reached by first loosening the three flat -head mounting <br />screws to remove the nameplate. The PC cards can then be inserted into or removed <br />from the edgecard connectors. <br />IMPORTANT* Turn off power before removing/inserting the PC card; failure to do so <br />may cause damage to the card components. <br />111.5. ZENER SAFETY BARRIERS <br />The interfacing between sensor cable (or home run conduit cable) and the electronic <br />motherboard is facilitated with Zener Safety Barriers. Depending on application <br />0 <br />