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815212322 Datasheet(PDF) 6 Page - Magnetrol International, Inc. |
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815212322 Datasheet(HTML) 6 Page - Magnetrol International, Inc. |
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6 / 28 page  3 50-605 Kotron RF Point Model 80/81 Level Switches 2.2.2 Tanks/Silos w/Non-Conductive Materials of Construction With plastic, concrete, wood, or any other non-conductive walled vessels, the reference electrode mentioned above needs clarification. Most commonly, this electrode will be in the form of a concentric ground tube (i.e. stilling well). In questionable circumstances, consult the factory. In all cases, a good electrical connection must be made between the ground surface and the probe housing. NOTE: These comments also apply for glass-lined metal walled tanks. Caution: When an insulated probe is used in a hazardous and/or abrasive medium, the probe should be inspected annually for any nicks, cuts or abrasions which may ruin the integrity of the insulation. In the event that wear is found, replace the probe or consult the factory for further instructions. This procedure is critical in vessels containing hazardous media. 2.3 Horizontal Mounting 2.3.1 Narrow Differential Single Point Units Only Horizontally mounted probes provide a high degree of sensitivity for use with non-conductive liquids as only approximately 0.625" of level change is required to com- pletely cover (or uncover) the probe. Horizontally mounted probe rods should be installed so that the rod is parallel to and at the level at which control point is desired. Refer to Figure 1. Avoid any installation method in which the material may become trapped in the mounting nozzle, thus preventing probe from signaling when level recedes. Refer to Figure 2. NOTE: If nozzle mounting is unavoidable, probe must be installed with an inactive metal sheath having a length at least 1 inch (25 mm) greater than length of nozzle. Sheath is required to render length of probe within nozzle insensitive to capacitance change. Refer to Figure 3. On applications involving viscous liquids or materials which tend to cling or buildup, horizontal mounting probes should be installed at a slight downward angle to allow material to drain from probe rod. With this type installation, packing gland face of probe assembly should extend into the tank (or vessel). Refer to Figure 4. Figure 1 Recommended Horizontal Mounting Probe Sheath 1" (25 mm) minimum Figure 2 Recommended Mounting with Nozzle Probe Sheath Figure 3 Not Recommended Figure 4 Alternate Horizontal Mounting for Viscous Materials |
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