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DUK - Small Inline Ultrasonic Flow Meter - High Turndown Ratio

DUK - Small Inline Ultrasonic Flow Meter - High Turndown Ratio

Product Features

Suitable for Many Liquids up to 68 cSt
Two Configurable Outputs
High Turndown Ratio of 250 to 1
Very Small Pressure Loss
Highly Repeatable
Flow and Temperature Measurement
Bi-directional Measurement Capabilities
Top Seller
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Exceptional Features and Expanded Application/Media Compatibility: New C3T0 Electronics

The globally proven KOBOLD DUK series line has been expanded with the inclusion of our new revolutionary C3T0 electronic. This exceptional new model includes integral temperature measurement, IO-Link, bi-directional flow capabilities, switching and batching and transmitting functions, two configurable outputs, and a digital touch screen that rotates the display in 90 increments depending on the installation position.

Another notable difference is that it can now process moderately viscous media up to 68 cSt. Specific media and media combinations can be specified within the instrument via a software upload. It is also designed with the future in mind as the electronics are now specifically designed for easy onsite repair and replacement. This new development launches an already versatile flow meter into a wide variety of new markets and applications and positions it uniquely within the market in both capability and pricing.

Compact Inline Ultrasonic Flow Meter

As the KOBOLD DUK inline ultrasonic flow meter does not require conductive media to operate, it is an ideal candidate for applications requiring an inline installation and where the media is not sufficiently conductive enough for a magnetic flow meter. Like magnetic flow meters, the DUK features a principle of measurement that does not require moving parts or any mechanical elements for flow rate measurement, delivering a long service life, minimal maintenance, and high accuracy.

Highest Turndown Ratio - 250:1

The DUK offers an exceptionally high turndown ratio in comparison to other options in the market. This makes it uniquely suited for applications where the process variables produce a widely fluctuating flow rate as many flow meters are not capable of providing consistent and reliable high accuracies across a wide range of flow rates.

View our DUK Ultrasonic Flow Meter video to learn more.

Ultrasonic Flow Measurement

DUK Ultrasonic Flow Meters operate by the principle of run-time or transit time difference. Ultrasonic waves in the media are influenced by the rate of flow. It features two sensors mounted opposite one another in the pipeline, which function simultaneously as transmitter and receiver of ultrasonic signals. If no flow is present, the run-times of both signals are identical. If the media is flowing, the run-time of the signal against the flow will be longer than the signal with the flow. This run-time difference, determined by the DUK’s microprocessor, is proportional to the flow rate. To learn more about Ultrasonic Flow Meters and their advantages and limitations, visit our in depth article.

Other Ultrasonic Flow Meter Installation Types

KOBOLD also offers the DUC Clamp-on Ultrasonic Flow Meter which delivers a clear cost advantage for flow measurement in large process pipe diameters.

Product Specifications

Measuring Ranges
0.02...5 GPM to 0.6...160 GPM
± 0.7 % of Rate and ± 0.7 % F.S.
½"...3" NPT or G Thread
Brass or 316 Stainless Steel
Maximum Temperature
194 °F
Maximum Pressure
230 PSIG
Turndown Ratio
250 to 1
Analog, Frequency, Switching, Compact Electronics with Configurable Outputs
Media Category

Product Features

Suitable for Many Liquids up to 68 cSt
Two Configurable Outputs
High Turndown Ratio of 250 to 1
Very Small Pressure Loss
Highly Repeatable
Flow and Temperature Measurement
Bi-directional Measurement Capabilities
Top Seller



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We are a value-driven global manufacturer of process and control instrumentation. Since 1980, we have offered one of the most comprehensive lines worldwide; consisting of flow, level, pressure, temperature, and more.

Here in our Pittsburgh-based US headquarters, we manufacture, sell, and support high-quality solutions for countless industries and applications.

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Our products are well-known for their quality, reliability, longevity, Innovation, and long-term value. Backed by German engineering and US manufacturing, our solutions remain cost-competitive even though they are not mass-produced.

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Finding the right process instrumentation doesn’t have to be intimidating. Because we make, sell, and support our products, we provide a guided, streamlined, and efficient experience that is built around your needs and our knowledge. We partner with you as much as you want, every step of the way.

Many manufacturers with limited product lines force a fit between their product and your application, often leading to over-specified and over-priced recommendations. Our comprehensive product line allows us to tailor the product to your application, not the other way around. We approach your product selection with a focus of integrity, not profit.

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