Thermal Dispersion Flow Switch SPX

The SP series consists of thermal dispersion flow switches that respond to liquid flow and provide a switching output. The thermal dispersion flow switch SP is made up of two temperature sensors. One serves as a reference and measures the temperature of the liquid in which the probe is immersed, while the second sensor is heated, creating a temperature differential between the two sensors. As the flow rate increases, the cooling effect reduces the temperature differential. As a result, higher flow leads to greater cooling, enabling the detection of flow changes. A reduction in the temperature differential between the sensors indicates that the set flow value has been exceeded, while an increase in the differential indicates a decrease in flow. The SP series is available in various versions with options for length, construction materials, and output types, allowing it to be tailored to a wide range of applications.

Main Features:

• No moving parts, semiconductor efficiency and reliability.
• Measurement range: 2.5 - 150 cm/s for water; 2.5 - 180 cm/s for oil.
• Parts in contact with liquid: 304SS, 316SS, PVDF, and polypropylene.
• Maximum operating pressure up to 100 bar.
• Choice of NPN/PNP relay, N.O. or N.C., or SPDT relay.
• Standard and custom extended lengths of probes.
• Available in standard or high-temperature, explosion-proof units.
• Flow status indication using an LED.
• Marine-certified unit available.

Applications:

• HVAC.
• Petrochemicals.
• Energy.
• Food processing.
• Pharmaceutical industry.