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Turbine flow meter

ideal for small installation spaces
Turbinen-Durchflussmesser Symbolbild | Turbine flowmeter (symbolic image)

Our flow measurement turbines are highly accurate and miniaturized. Thanks to an integrated, wetted thermocouple, turbine flow meters from DDM operate independently of viscosity.

Turbine flow meters are ideal for liquids such as oils, petrol, diesel or cooling water. The measured media flow through a measuring tube with integrated flow straightener and cause the turbine wheel to rotate. The integrated signal tap records the speed of the turbine wheel and generates a digital frequency signal that is proportional to the current flow rate.

The advantages of our measuring turbines at a glance

  • Suitable for small and confined installation spaces
  • independent of viscosity
  • Wide temperature range: -40 to 150 °C
  • Highly accurate and dynamic

Your Mission Impossible is our passion. Our team specializes in the production of customer-specific designs of turbine flow meters and looks forward to your inquiry and task.

turbine flow meter threaded Connection Messturbine Gewindeanschluss-VCT-AN
Price on Application

Thread: AN8; AN10; AN12

Measurement ranges: 0,1 to 100l/m

Repeatability: ± 0,025 % of reading

Temperature probe media exposed: Type T thermocouple

Datasheet : pdf | 314 KB

Price on Application
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Hose barbed connection Messturbinen Schlauchanschluss-VCT
Price on Application

Hose connection Ø: 9,8 to 32mm

Measurement range: 0,1 to 350l/min

Repeatability: ± 0,025 % of reading

Temperature probe media exposed: Type T thermocouple

Datasheet : pdf | 314 KB

Price on Application
Select options

Areas of application for turbine flow meters

Turbine flow meters are ideal for all mobile applications in development.

Due to the large temperature range of -40 to 150°C and the high measuring dynamics, coupled with excellent repeatability, measuring turbines are used in the development of a wide range of vehicles and machines such as:

  • Passenger Cars
  • Trucks
  • Tanks
  • Airplanes
  • Mining machinery
  • Technically sophisticated construction and excavation equipment

The small space requirement of the turbines simplifies the installation of this flow meter even in very confined spaces.

Suitable measuring media for turbine flow meters

All wetted parts of the measuring turbine are made of stainless steel, only the hybrid bearings are equipped with ceramic balls. Turbine flow meters can therefore be used for a wide range of liquids such as oil, petrol, diesel, cooling water, thermal oils, gear oils, kerosene as well as deionized (DI water) and FE water. Thanks to viscosity correction and linearization, a flow measurement system enables highly accurate flow measurement of the media over the entire temperature range – even for higher viscosities.

Features of the turbine flow meter

Turbine flow meters are generally characterized by very high accuracy. In practice, measuring turbines from DDM with a connected flow computer and linearization and viscosity correction achieve a measuring accuracy of less than 0.5 percent of the measured value. The flow rate range is also high at 0.1 to 350 l/min. The repeatability is +/-0.025% of the measured value (at a viscosity of 1mm²/s).

It is possible to order the turbine with a threaded or hose connection in order to connect it flexibly to different lines. During flow measurement, it tolerates measuring media in a temperature range from -40 to 150 °C. Thanks to its IP67 classification, it is fully protected against dust and can be temporarily immersed in water up to one meter deep.

Design and function of the measuring turbines

During flow measurement, the measured medium first flows through a flow straightener, which creates a uniform flow before the medium hits the impeller.

Depending on the flow velocity of the medium, the impeller is set in rotation.

An RF oscillating circuit is built up in the head of the turbine by means of a coil. This detects the rotating impeller, which enters and leaves the oscillating circuit.

The electronics in the head of the turbine convert the RF signal into a TTL open collector output signal.

Furthermore, the calibration data (universal vicosity curve / UVC characteristic curve) is stored in the head of the turbine. This makes it possible to operate any turbine with any flow computer (VCA).

The wetted thermocouple type T measures the media temperature accurately and highly dynamically. This is particularly important for carrying out the viscosity correction of the turbine. Communication from the turbine to the flow computer is completely digital. The thermocouple signal in the head of the turbine is also digitized. Digital communication ensures a high level of EMC safety. The measuring cable length between the turbine and flow computer can be significantly longer than in a system with RF resonant circuit generation in the flow computer.

Turbine flow meter – cross sectional model

Installation of the turbine flow meter

For installation, the hose is cut open, the turbine inserted and fastened with hose clamps or similar clamps. For pipe applications, the turbine is screwed in. Due to the miniaturization of the turbine and the resulting low weight, the turbine does not need to be supported. The turbine is connected to the flow computer (VCA) via the measuring line.

The flow computer can be attached to the rear with cable ties or M4 threaded screws. The linearized and viscosity-corrected flow measurement signal can be transmitted via an analogue output signal (0-10VDC or 4-20mA) or via CAN bus.

Calibration and maintenance of the measuring turbines

Turbines are calibrated with different viscosities in order to obtain the universal viscosity curve / UVC characteristic curve. This represents the turbine behavior over a calibrated viscosity range.

DDM expert TIP

We recommend annual calibration and inspection of precision measuring turbines. However, the actual calibration interval is determined by the operator of the measurement technology and can vary depending on the area of application and duration of use.

To ensure long-term reliable operation, a precision measuring turbine must be properly cleaned after each use. Cleaning is carried out by flushing with suitable fluids, depending on the system fluid used.

The following cleaning fluids are recommended:

  • Type A   MIL-PRF-7024 or an equivalent light solvent
  • Type B   Ethanol or an equivalent alcohol-based cleaning agent
Cleaning of turbine flowmeters
from      to oil-based water-based
oil-based Cleaning fluid type A 1. Cleaning fluid type A
2. Cleaning fluid type B
water-basis 1. Cleaning fluid type B
2. Cleaning fluid type A
Cleaning fluid type B

Measuring turbines according to your requirements

Turbine flow meters from DDM, combined with our intelligent flow computers, offer first-class, high-precision measurement solutions to support the development work of a wide range of companies and industries. Our turbine flow meters are individual, customized products that optimally meet the respective specific requirement profiles. Our experts will be happy to provide you with personal and individual advice at any time.

Good to know! Measuring turbines can also be equipped with an additional pressure sensor.

Request turbine flow meter online

Request your individual configuration for your turbine flow meter now. Let us know your requirements and wishes regarding measuring range, process connection, calibrated measuring range [l/min] and viscosity correction and we will work with you to find the optimum product solution for your specific application and measuring task. We look forward to receiving your inquiries and tasks relating to turbine flow meters.

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