Suppliers

Metritape Inc.; R-Tape Corp.; Sankyo Pio-Tech

The resistance tape (see Figure 7.6.24) for continuous liquid level measurement was invented in the early 1960s, initially for water well gauging and subsequently for marine and industrial usage. The sensor is a flat, coilable strip (or tape), ranging from 3 to 100 ft (1 to 30 m) in length, suspended from the top of the tank. It is small enough in cross-section to be held within a perforated pipe (diameter of 2 to 3 in), which also supports the transducer and acts as a stilling pipe when the process is turbulent.

While resistance tapes are not widely used in the waste-water treatment industry today, their low cost, low maintenance, and adaptability for multipoint scanning makes them a candidate for use in new plants.

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