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G3F-PB80-JGF Datasheet(PDF) 6 Page - Magnetrol International, Inc. |
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G3F-PB80-JGF Datasheet(HTML) 6 Page - Magnetrol International, Inc. |
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6 / 36 page  6 46-624 Series 3 Liquid Level Switches ASME B31.1 Construction Controls should be mounted as close to the vessel as possi- ble. This will result in a more responsive and accurate level change in the control. Liquid in a long line may be cooler and more dense than liquid in the vessel causing lower level indication in the control than actual level in the vessel. Caution: Operation of all buoyancy type level devices should be done in such a way as to minimize the action of dynamic forces on the float or displacer sensing element. Good practice for reducing the likelihood of damage to the con- trol is to equalize pressure across the device slowly. 2.5 Wiring NOTE: A switch or circuit breaker shall be installed in close proximi- ty to equipment and within easy reach of operator. It shall be marked as the disconnecting device for the equipment. NOTE: For supply connections in installations with ambient tempera- ture up to +158° F (+70° C), use wire with a minimum rating of +167° F (+75° C) as required by the process conditions. Installations with ambient temperatures up to +176° F (+80° C) require wire with a minimum rating of +185° F (+85° C) as required by the process conditions. Use a mini- mum of 14 AWG wire for power and ground field wires. Caution: Level controls are shipped from the factory with the enclosing tube tightened and the middle set screw, on the housing base, locked to the enclosing tube. Failure to loosen the set screw prior to repositioning the conduit con- nection may cause the enclosing tube to loosen, resulting in the possible leakage of the process liquid or vapor. Series 3 controls are shipped with the conduit entry of the switch housing placed 180° opposite to the tank con- figurations to simplify installation in most cases. If this configuration is appropriate to the installation, proceed to step 4 to begin wiring the unit. If another configuration is desired, the switch housing can be easily rotated by first following steps 1, 2, and 3. 1. Loosen set screw(s) at base of switch housing. Refer to Figure 4 . 2. Switch housing may be rotated 360° to allow correct posi- tioning of conduit outlet. 3. Tighten set screw(s) at base of switch housing. 4. Unscrew and remove switch housing cover. The threads have been lubricated to facilitate removal. NOTE: On high temperature applications (above +250° F [+121° C] in float chamber), high temperature wire should be used between control and first junction box located in a cooler area. On non-hazardous applications, flexible conduit may be used between the control and the first junction box. Internal Circuit (Right) Switch 1 2 3 Load Load Close on high level Common Close on low level Line 4 5 6 Internal Circuit (Left) Switch Load Load Close on high level Common Close on low level Line Set Screw Screw Screw Figure 4 NEMA 4X/7/9 Figure 5 Wiring diagram for DPDT Series A, B, C, D, E & F switches |
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