Float and rope level gauge

Float and rope level gauge

(Wire-guided float level detectors)

For measuring high levels (for example, 20 meters), these types of level detectors can be used. The guided wires are connected to anchors at the top and bottom of the tank, as shown in the diagram, and help in positioning the float that moves along the liquid surface. The connecting tape is attached to the top of the float and extends up to the top of the tank, then continues on a pulley. It then goes down to the Gauging Head, which is installed outside the tank and is suitable for viewing the level. To prevent slack in the tape, a take-up pulley is used, and the tension caused by the take-up pulley ensures accurate measurement, regardless of the float's position. The tension force of the take-up pulley is less than the force due to the float's weight when it is free and greater than the float's weight when it is suspended in the fluid. When the float moves, the position of the level is indicated by the pointer, and this system can be used in both atmospheric and pressurized tanks.

General Applications:

This type of level measurement is commonly used in large fuel tanks, especially in cases where Intrinsic Safety is of importance.

Advantages:

• High-level measurement

• With Intrinsic Safety

Disadvantages:

• Relatively high price

• Mechanical wear

• Requires periodic servicing and maintenance of the connecting tape