PMA for Linz waterworks

11/09/2025

More than motors – units consisting of motor, pump, cooling jacket and PT100

Franklin Electric is not only a leader in the development and manufacturing of submersible motors up to 400 kW / 12" / 3300 V, but also offers complete pump systems including matching submersible pumps which are produced in-house.
These systems are designed for flow rates of up to 650 m³/h and are available in various stainless steel configurations – ideal for demanding applications such as municipal water supply. Matching control and monitoring units not only increase system efficiency but also enhance reliability and service life.

For the drinking water supply in Linz (Austria), a high-performance pump and motor unit in 10"/12" configuration was recently installed – with a total length of approximately 3 meters and a total weight of over 1,000 kg. Due to its size and complexity, installation was carried out at the Franklin Electric facility in Wittlich (Germany). In addition, the experienced Franklin Electric service team supported the commissioning process directly on site in Linz.
The unit was installed in a drinking water well approximately 30 meters deep, located in a wooded area near the Donau River. From there, the water is transported—together with water from additional wells—to a nearby municipal waterworks that ensures the city’s drinking water supply.

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PT100 temperature sensor

The customer opted to install an additional PT100 temperature sensor. This is a highprecision platinum sensor with a linear resistance-totemperature characteristic. The sensor is installed in the upper endbell, measures the temperature above the winding head, and thus continuously monitors the winding temperature.
The PT100 temperature sensor is equipped with a 4-core shielded cable, available in various lengths, providing additional protection against high-frequency interference that can occur in applications with frequency converters.

System components:

The system was additionally equipped with a PT100 temperature sensor, which monitors the winding temperature and protects the motor from overheating. In addition, the team decided to install a cooling shroud, as the well diameter in Linz is too large to ensure sufficient cooling flow along the motor (see info box).