Model 718D

SKU: 718D

Displacer Switch, Top Inserted, Four Point, Differential

Operation: The weight of a displacer is supported by a spring. Variations in liquid level cause the displacer to move up and down. Switching action occurs as the level passes each displacer.

Uses: High and/or low alarm; single and multiple pump control

Insertion and Switching band: up to 50 feet maximum

Switch action: From 1 to 4 points of alarm and/or on-off pump control

Specific Gravity: form 0.25 to 2.4 SGU

Temperature: from –20 to 500°F

Pressure: from –15 to 2200 PSIG

Process Connection: 3″ to 4″ NPT threaded; 3″ to 12″ flanged up to 1500# rating; ASA, DIN, or JIS style

The Delta Controls Model 718D utilizes a mechanism and displacers similar to the Model 718a four-point alarm. The difference is that an adjustable differential device has been added and only three switch stations are utilized. The lower switch station activates when the liquid level covers the “L2” displacer, and stays activated until the liquid level drops below the “L1” displacer. The middle switch station activates when the liquid level covers the “L3” displacer and stays activated until the liquid level drops below the “L2” displacer. The upper switch station activates when the liquid level covers the “L4” displacer and stays activated until the liquid level drops below the “L3” displacer. This is very versatile unit and can perform complex control functions. Common applications include: A. Control 3 pumps B. Control 2 pumps with a high or low alarm C. Control 1 pump with a high and low alarm D. Provide staging for operation of 3 pumps on storm water inflow conditions.

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