Paddle wheel flow meters are accurate and cost-effective flow meters and are ideal for measuring the flow of low-viscosity, water-like liquids. Thanks to their sapphire bearings, these flow meters are particularly robust and durable. Due to their design, paddle wheel flow meters are less susceptible to contamination. Installation is simple and space-saving, as no calming section is required at the inlet.
The advantages of our paddle wheel sensors
- Robust and durable
- Low space requirement
- Inexpensive
- NSF approval
Flow meters from DDM are first-class measurement solutions for companies in a wide range of industries.
In addition to our fixed range with high performance and reliability, our customers have the option of determining the specifications of their pelton wheel flow meters themselves. Our team will be happy to provide you with comprehensive and individual advice and looks forward to hearing about your requirements.
In our practical guide on the subject of paddle wheel flow meters, you will find many more details on the areas of application of impeller wheel sensors in flow measurement as well as their design, mode of operation, suitable measuring media, installation, maintenance and calibration.
excl. 19% VAT plus shipping costs
Hose connection Ø: 3/8“
Measurement range: 0,6 – 10 l/min
Repeatability: 0,1%
Material of wetted parts: PVDF including NSF
Output: Impuls (NPN or PNP)
Temperature range: -25 to 125°C
Data sheet: pdf | 129 KB
excl. 19% VAT plus shipping costs
excl. 19% VAT plus shipping costs
Hose connection Ø: 8 & 12mm
Measurement range: 0,05… 0,5 l/min to 0,50 … 15,0 l/min
Repeatability: 0,1%
Material of wetted parts: PVDF including NSF, customer-specific
Output: Impuls (NPN or PNP)
Temperature range: -25 … 60°C or -25 … 125°C
Data sheet: pdf | 244 KB
excl. 19% VAT plus shipping costs
excl. 19% VAT plus shipping costs
Connection: 1/4″ BSPF, 1/4″ NPTF
Measurement range: 0,05… 0,5 l/min to 0,50 … 15,0 l/min
Repeatability: 0,1%
Material of wetted parts: PVDF or stainless steel
Output: Impuls (NPN or PNP)
Temperature range: -25 … 60°C or -25 … 125°C
Data sheet: pdf | 410 KB
excl. 19% VAT plus shipping costs
excl. 19% VAT plus shipping costs
Connection: 1/2″ BSPF
Measurement range: 0,05… 0,5 l/min to 2,0 … 30,0 l/min
Repeatability: 0,1%
Material of wetted partsin contact with media: PVDF or stainless steel
Output: Impuls (NPN or PNP)
Temperature range: -25 … 60°C or -25 … 125°C
Data sheet: pdf | 270 KB
excl. 19% VAT plus shipping costs
excl. 19% VAT plus shipping costs
Connection: 8mm & 13mm hose; ¼“ up to 1“ BSP
Measurement range: 0,5 l/min to 160,0 l/min
Repeatability: 0,1%
Material of wetted parts : PVDF, PVC, Brass or Stainless Steel
Output: Impuls
Temperature range : -15 up to 125°C
Data sheet FT2 hall effect: pdf | 245 KB
excl. 19% VAT plus shipping costs
excl. 19% VAT plus shipping costs
Connection: 8mm & 13mm hose; ¼“ up to 1“ BSP
Measurement range: 0,02 l/min up to 160,0 l/min
Repeatability: 0,1%
Material of wetted parts : PVDF, PVC, Brass or Stainless Steel
Output: Impuls
Temperature Range : -10 to 80°C
Data sheet FT2 optical: pdf | 238 KB
excl. 19% VAT plus shipping costs
DDM practical guide on the subject of paddle wheel meters
Areas of application for paddle wheel flow meters
Paddle wheel flow meters are used for a wide range of measuring tasks in numerous economic sectors and industries, for example in beverage and food technology, the chemical industry and the automotive industry. Pelton wheel flow meters are also used for simple laboratory applications.
Paddle wheel meters for industrial and laboratory applications
Paddle wheel meters are ideal for industrial and laboratory applications, particularly due to their robust materials, which also allow contact with aggressive media and FE or DI water. The robust sapphire bearings ensure excellent reproducibility, which is crucial for precise measurements in demanding applications.
Various models are available for different temperature ranges, covering media temperatures from -10 to 60 °C up to -25 to 125 °C. This offers maximum flexibility when selecting the appropriate impeller wheel meter, adapted to specific measurement requirements.
Paddle wheel meters are designed for a process pressure of up to 10 bar as standard. For more demanding applications, models that can withstand a pressure of 40 bar are optionally available. Thanks to their robust design and adaptability, the paddle wheel meters can be precisely tailored to the requirements of specific applications, making them an ideal solution for demanding industrial and laboratory applications.
Specific product information on selected areas of application for paddle wheel flow meters
DDM product recommendation: Paddle wheel flow meters for the food and beverage industry
For the food and beverage industry, we recommend using the NSF Beverage Mini or the 800 series paddle wheel flow meters, which are ideal for beverage filling, batch dosing and beer and dispensing system monitoring.
excl. 19% VAT plus shipping costs
Hose connection Ø: 3/8“
Measurement range: 0,6 – 10 l/min
Repeatability: 0,1%
Material of wetted parts: PVDF including NSF
Output: Impuls (NPN or PNP)
Temperature range: -25 to 125°C
Data sheet: pdf | 129 KB
excl. 19% VAT plus shipping costs
DDM product recommendation: Paddle wheel flow meters for the chemical industry and laboratory applications
excl. 19% VAT plus shipping costs
Hose connection Ø: 8 & 12mm
Measurement range: 0,05… 0,5 l/min to 0,50 … 15,0 l/min
Repeatability: 0,1%
Material of wetted parts: PVDF including NSF, customer-specific
Output: Impuls (NPN or PNP)
Temperature range: -25 … 60°C or -25 … 125°C
Data sheet: pdf | 244 KB
excl. 19% VAT plus shipping costs
The 800, 900 and 1,000 series paddle wheel flow meters are ideal for the chemical industry. They are ideal for laboratory tests and are characterized by their special suitability for aggressive chemical environments. These pelton wheel flow meters can also be used to measure FE water.
DDM product recommendation: Paddle wheel flow meters for the automotive industry
For the automotive industry, we recommend using the 800, 900 or FT2 series paddle wheel flow meters. Among other things, they are suitable for simple engine tests and can be fitted with either a Hall effect sensor or an optical sensor.
excl. 19% VAT plus shipping costs
Connection: 8mm & 13mm hose; ¼“ up to 1“ BSP
Measurement range: 0,5 l/min to 160,0 l/min
Repeatability: 0,1%
Material of wetted parts : PVDF, PVC, Brass or Stainless Steel
Output: Impuls
Temperature range : -15 up to 125°C
Data sheet FT2 hall effect: pdf | 245 KB
excl. 19% VAT plus shipping costs
Suitable measuring media for paddle wheel flow meters
Paddle wheel flow meters can handle aggressive or abrasive liquids as well as water and various beverages (e.g. beer, wine or spirits). As they are viscosity-dependent, they are only suitable for measuring low-viscosity media (water-like media).
Features of the paddle wheel flow meter
Paddle wheel flow meters are suitable for flow rates from 0.02 l/min to 160 l/min. They have a high measuring accuracy with a deviation of only 1 to 2 percent from the measuring range. They also ensure good reproducibility, as deviations in repeated measurements are only up to 0.1 %. The various sealing materials such as Viton, EPDM, NBR, silicone and Kalrez allow adaptation to different media and temperatures.
The housing materials PVDF and stainless steel 316 are robust, corrosion-resistant and hard-wearing, which means they can also be used in heavy-duty industrial applications where the paddle wheel flow meters are exposed to aggressive or abrasive liquids. The resistance of the devices is underlined by their high protection class, so that devices with protection class IP65 or IP67 are optionally available.
Customers also have a choice of output signals for the pelton wheel sensors and can choose between NPN and PNP signals. In addition to the standard BSP and NPT threaded connections used in fluid technology, impeller meters also offer direct hose connections and quick-release couplings such as John Guest. They allow easy integration into existing pipelines and hose systems.
Design of the paddle wheel flow meter
The turbine wheel is subjected to a radial flow, whereby the liquid is directed through a nozzle onto the impeller. Three magnets are firmly encapsulated in the impeller so that they are not in contact with the medium. The Hall-effect sensor installed in the housing detects the passing magnets and converts the movement into electrical pulse signals (NPN or PNP) that are proportional to the flow rate or speed. As three pulses are generated per rotation of the impeller, a high resolution is achieved.
The impeller is mounted on robust and durable sapphire bearings. This makes the flow meter extremely reliable, even when used continuously.
Various O-ring materials are available for sealing the housing, such as Viton, EPDM, NBR, silicone and Kalrez, which allow the flow meters to be adapted to different media and operating conditions.
Installation of the paddle wheel flow meter
The paddle wheel flow meter is connected via the respective threads. In a hose application, however, the hose is cut apart before commissioning in order to insert the pelton wheel flow meter into the hose. It is also possible to connect the hoses using a John Guest quick coupling. This industry standard is known from the food industry.
Signal output and data processing
DDM’s impeller flow meters provide a pulse output signal (PNP or NPN) that can be processed directly by a PLC or other evaluation electronics. The signal can be linearized using the data from the supplied calibration certificate, which increases the measurement accuracy.
The Pulsit Solo [SM1] is available as a simple display that can be connected directly to the paddle wheel meters. It displays both the current flow rate and the measured total volume.
The Pulsit Link [SM2] also offers the option of linearizing the measurement signal and provides various output signals, including current (0-5VDC, 0-10VDC), voltage (4-20mA) and TTL pulse. The measurement results can be integrated directly into programs such as LabVIEW via the ASCII interface. In addition, the Titan Interface software allows the flow meter to be connected directly to a computer using the Pulsit Link. This allows the settings to be configured, the current flow rate to be displayed in real time and the measurement data to be recorded.
Calibration and maintenance of paddle wheel flow meters
The calibration intervals for paddle wheel flow meters are typically determined by the operators themselves, who adapt them individually to the requirements of their particular application. We are happy to offer our customers calibration on request. A particular advantage: DDM pelton wheel flow meters are maintenance-free, so that they are permanently ready for operation after installation.
Special paddle wheel sensors for your requirements
Your Mission Impossible is our passion. We also develop and design individual paddle wheel sensors that are precisely tailored to the specific requirements of the measuring task. We are in close contact with our customers throughout the entire development process.
Order or request paddle wheel flow meter online
Find and order the paddle wheel flow meter best suited to your application in just a few clicks directly in our online store or request individual configurations. Our experts will also be happy to provide you with personal advice at any time. We look forward to your inquiries and tasks.