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The desired dosing process can be started and stopped both locally on the display and via an external control input. The desired quantity is adjusted on site via the keys. "Particularly in sensitive processes such as tablet coating, precisely measured partial quantities and good response times are indispensable," confirms Agha.

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ResidentialinlinewaterFlow Meter

The flexibility of the unit family is reflected in the user guidance and the range of functions. Almost all settings can be conveniently set on the display via four optical keys on site. Functions such as temperature measurement, partial quantity display or maximum flow rate can be assigned to the hotkeys mentioned, so that it is not necessary to constantly navigate through several control levels in the menu. This can be done just as safely with most gloves. The multi-line display offers a better overview than comparable devices and shows the corresponding unit or other additional information next to the measured value. This clarity is further enhanced by the multi-colour display: for example, the colour changes when a certain flow volume has been reached. This allows the user to see from a distance when a certain quantity has been dosed or a limit value has been exceeded.

The DUK flow meter offers several significant benefits: •    Wide Flow Range: Supports flow rates from 0.08 L/min to 630 L/min, suitable for fluctuating or low-flow conditions. •    Minimal Pressure Loss: Reduces energy consumption while maintaining system efficiency. •    High Repeatability: Ensures consistent and reliable performance over time. •    Independence from Fluid Properties: Performs accurately regardless of fluid density or temperature changes.

DigitalFlow Meter

The DUK flow meter uses the transit-time principle, where ultrasonic waves are sent through the fluid by sensors placed on opposite sides of the pipe. The time difference between waves traveling with and against the flow correlates directly to the fluid's velocity, enabling precise volume flow measurement.

•    Orientation: The DUK can be installed in any position, provided the flow direction matches the arrow on the housing. •    Straight Pipe Length: Ensure 10x the nominal pipe diameter (10 x DN) of straight pipe upstream and downstream for optimal accuracy. •    Electronics Positioning: For horizontal installations, place the electronics module on top or below the flow path for optimal performance.

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InlineWaterFlow Meter

In addition to the temperature measurement function, the DUK is often used for small nominal pipe sizes. The DUK covers a large measuring range for volume flow measurement according to nominal width - with a measuring range factor of up to 250.

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The DUK flow meter is widely applicable across industries, including: •    Machine Building: Precision flow control for manufacturing processes. •    Automotive: Coolant flow measurement, fuel system testing, and lubrication monitoring. •    Robotics: Accurate flow control in hydraulic and pneumatic systems. •    Cooling Systems & Hot Water Applications: Ensures efficient flow measurement in heating and cooling circuits, promoting energy savings      and system reliability.

Whether in the pharmaceutical industry, water treatment or food production: If non-conductive media flow in a chemical process, ultrasonic flow meters are usually installed for monitoring. For monitoring, the measuring devices require short response times and a high degree of calibration freedom, otherwise incorrect metering or insufficient repeat accuracy will occur. The maintenance-free ultrasonic flowmeter type DUK with the newly developed C3T0 compact electronics from KOBOLD Messring GmbH provides a remedy here. Due to the extensive possibilities for on-site programming, the DUK is suitable for cross-industry use for diverse media.

"The flow meters have two individually configurable outputs, which, depending on the setting by the customer, function as a pulse, alarm or analogue output, for example," explains Agha. "This makes them easier to integrate into different processes or auxiliary circuits and, with their short response times, they represent real added value." The colour multi-display can also be digitally rotated in 90° increments, so there is no need for a different model when changing locations and the display is independent of the position of the connections.

This is possible by combining the DUK with the new smart electronics, onto which the file with media-specific data is imported from the PC and used from that point on. KOBOLD also sells the corresponding PC interface with USB connection. The associated software "Mediator Tool" is provided to the customer free of charge. On customer request, the units can also be set and calibrated at the factory. Either the DUK can be set for a fixed operating point or a configuration for different temperature ranges can be stored.

The DUK flow meter is designed for low-viscosity fluids, including: •    Water •    Water-glycol mixtures •    Oils •    Ethanol •    Demineralized water It operates effectively as long as the fluid permits ultrasonic wave propagation

"Ultrasonic flowmeters do not have moving parts such as impellers, which is why they do not show any signs of wear. Therefore, these devices have proven themselves for flow determination of diverse media," explains Raza Ali Agha, Sales Manager at KOBOLD Messring GmbH. "This wide range of applications leads to different installation situations, as the measuring devices are used in various industries and processes." The nominal diameter of the connected pipes and the possible alignment during installation and the integration into process chains, such as the precise regulation of the coolant supply, influence the choice of a suitable device. Particularly in the context of metering processes, the measuring instruments offer the possibility of programming intermediate values in order to document the quantities.

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The flow meter of the DUK series previously covered the needs for water and water-like media. Now, by incorporating additional media parameters, the proven DUK is used for volume flow measurement of almost all homogeneous, Newtonian media, even without electrical conductivity. Examples include demineralised water (deionate), water-glycol mixtures with different mixing ratios, oils and aliphatic hydrocarbons such as ethanol, as long as ultrasonic waves can pass through.

For this reason, KOBOLD Messring GmbH has developed universal flow meters with IO-Link in the form of the DUK product, which are suitable for almost every measuring situation and, in addition to response times of less than one second, guarantee a high degree of programming freedom. This is ensured by the numerous functions, such as temperature measurement or flow rate, which can be set in a few steps in the menu on quick selection keys (so-called hotkeys).

An ultrasonic flow meter is a precision instrument used to measure fluid velocity and calculate volume flow using ultrasonic sound waves. It operates using two primary methods: •    Transit-Time Method: Measures the time difference between ultrasonic pulses traveling with and against the direction of fluid flow. •    Doppler Effect: Detects frequency shifts caused by particles or bubbles in the fluid. Ultrasonic flow meters are known for their long-term cost-effectiveness due to their non-intrusive design and lack of moving parts, which minimize maintenance compared to traditional mechanical flow meters.

Ultrasonicflow meter

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Measuring range: 0.08 - 20 ... 2.5 - 630 l/min liquid Connection: G ½ ... G 3 female thread, ½" ... 3" NPT female thread Material: brass, stainless steel 1.4408 pmax: 16 bar tmax: 90°C Accuracy: ±0.7 % of reading + 0.7 % of full scale Switching output, frequency output, analogue output, compact electronics with IO link function

"During the conception phase, we used the experience reports of our customers from various industries as a basis for developing a flexible and reliable universal device specifically for non-conductive media. With the extension of the DUK by the C3T0 option, there is now a measuring device for almost every measuring project," sums up Agha. "At the same time, the measuring devices are prepared for future media. They are simply changed over by file upload via USB when process conditions change."

Digital AirFlow Meter

The DUK flow meter stands out due to its advanced features and flexibility: •    Non-Intrusive Design: No moving parts ensure durability, extended service life, and minimal maintenance. •    High Accuracy: Delivers precise measurements even for small and fluctuating flow rates. •    Customizable for Specific Media: Configurable to accommodate various low-viscosity fluids. •    Independent of Viscosity Changes: Maintains accurate performance even as temperature-induced viscosity variations occur. •    In-Built Temperature Compensation: The integrated temperature sensor continuously measures the medium’s temperature, ensuring      consistent accuracy by compensating for sound velocity changes. •    Compact Design: Ideal for applications with small flow ranges or tight spaces. •    Versatility: Serves a variety of industries, including automotive, robotics, and cooling systems. These features make the DUK flow meter a reliable and efficient solution for complex industrial applications.

Yes, the U-PACE version of DUK flow meter features an integrated temperature sensor that compensates for changes in fluid temperature. This ensures precise flow measurement by adjusting for temperature-induced variations in the speed of sound.

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The U-PACE (Universal Precision and Compact Electronics) version enhances the flow meter with additional advanced features: •    Dual Configurable Outputs: Outputs can be set as pulse, frequency, alarm, or analog, offering maximum flexibility. •    IO-Link Integration: Ensures seamless connectivity with modern industrial systems, supporting Industry 4.0 initiatives. •    Enhanced Diagnostics: Enables monitoring of sensor health and detects conditions such as empty pipes. •    User-Friendly Display: Features a rotatable, multi-color display for easy reading and intuitive operation. These enhancements make the U-PACE version an excellent choice for precise flow measurement in advanced industrial systems. Watch the video for a detailed overview:

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The DUK flow meter is designed for accurate measurement, monitoring, metering, and dosing of low-viscosity fluids. Its reliability and precision make it ideal for applications requiring high-performance flow monitoring in industries such as manufacturing, automotive, and cooling systems.

The units of the DUK family operate according to the transit time difference method. This is based on the fact that ultrasonic waves in a medium are influenced by the flow velocity. Two sensors mounted opposite each other in the pipeline work simultaneously as transmitters and receivers of ultrasonic signals. If there is no flow, the transit time of the two signals is identical. When the medium is flowing, the transit time against the direction of flow is longer than the transit time of the signal in the direction of flow. The transit time difference determined by a microprocessor is proportional to the volume flow. The temperature has an influence on the speed of sound and thus on the accuracy of the measurement result. Therefore, the current temperature of the medium is measured by means of a temperature sensor integrated in the unit and compensated for by the electronics when calculating the volume flow.

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