Oscillation Flow Meter for Gases DOG

A DOG oscillation flow meter is a specialized instrument designed to measure gas flow rates of dry and wet gases in industrial applications. It operates without moving parts, ensuring minimal pressure loss and ensuring long-term reliability. The oscillation of the gas stream creates a frequency proportional to the flow rate, which is then converted into an accurate measurement.

The principle of operation is as follows:

First, the gas flows through a tube fitted with an orifice plate. The back pressure created at the orifice causes part of the gas flow volume to be diverted into a bypass. This diverted gas ratio remains constant over the entire measuring range.

Next, the gas enters the oscillator measuring cell and meets a baffle where it is deflected. As the flow passes one of the openings of the connecting channel, it creates a negative pressure on one side and a compensating positive pressure on the opposite side. These pressure conditions cause the gas flow to change directions, reversing as it moves past the other side. This rapid succession of flow direction changes causes the gas column in the connecting channel to oscillate.

The oscillation frequency is directly proportional to the flow velocity and the total volume flow. A platinum sensor detects these oscillations, producing an alternating electrical signal. A downstream transmitter then linearizes the signal, which is further processed by various evaluation electronics. For added convenience, optional software allows users to program recalibration values on-site.

For more information, watch the video with a detailed overview.

A DOG oscillation flow meter offers numerous advantages, making it a reliable choice for gas flow measurement. Key benefits include:

1. No Moving Parts: Ensuring minimal wear and tear, leading to lower maintenance costs.
2. Low Maintenance and High Longevity: Designed for durability, even in challenging conditions.
3. Minimal Pressure Loss: Efficient flow measurement without significant presuure loss.
4. Wide Sensing Range: Accurately measures a broad range of gas flow rates.
5. Resistant to Moisture and Contaminants: Performs reliably even with moist gases, such as biogas. 
6. Certified for Safety: Meets industry standards with certifications like ATEX and IECEx.

DOG oscillation flow meter is available in two primary models: DOG-4 and DOG-6, each designed to suit different gas measurement needs.

DOG-4:

1. Ideal for measuring dry gases and mixed gases.
2. Offers reliable performance in clean and controlled environments.
3. Suitable for applications where gas composition remains stable.

DOG-6:

1.  Versatile and designed for almost all gas types, including dry gases, mixed gases, changing gas mixtures, and moist gases.
2. Specifically suited for biogas measurement due to its insensitivity to moisture and contaminants.
3. Designed with a robust construction for a reliable performance in harsh and explosive environments.
4. Ensures low pressure loss and long-term reliability.

Key Features of DOG-6:

1. New Architecture: Improved design for enhanced durability and performance.
2. Stainless Steel Construction: Ensures corrosion resistance and longevity.
3. Long-Term Stability: Provides consistent and accurate measurements over time.
4. Platinum Sensor: Delivers superior accuracy and reliable gas flow detection.

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The DOG is uniquely and ideally suited for the measurement of biogas because it is insensitive to both the moisture content of the gas and any possible contamination. The robust design coupled with the extremely low-pressure loss, allows the DOG to provide reliable measurements in harsh and explosive environments.

Additionally, DOG oscillation flow meter is well-suited for biogas plants due to:

1. Long-Lasting Reliability: Provides consistent performance even in moist and low-pressure environments.
2. Condensate Management: The sloped measuring chamber design ensures effective condensate drainage.
3. Sulphur Resistance: The sensor remains unaffected by the presence of sulfur, ensuring accurate measurement.
4. Minimal Pressure Drop: Ideal for naturally generated biogas with low operating pressure.

DOG oscillation flow meter is ideal for industries that require precise gas flow measurement. Key industries include:

1. Biogas Plants: Efficiently monitor and control biogas flow, even in moist or contaminated conditions.
2. Steel Production: Ensure accurate gas flow management for combustion and processing applications.
3. Chemical Processing: Measure various gases involved in chemical reactions and ensure process safety.
4. Wastewater Treatment Plants: Track and regulate gases like biogas generated during waste treatment.
5. Medical Gas Supply Systems: Provide reliable gas flow measurement for hospitals and medical facilities.
6. Compressed Air Monitoring: Optimize energy use by accurately measuring compressed air flow in industrial operations.

DOG oscillation flow meter is versatile instruments used for measuring various gases. Their common applications include:

1. Compressed Air Monitoring: Track airflow in pneumatic systems for efficient operation.
2. Natural Gas and Biogas Measurement: Ensure accurate flow data in energy production and distribution.
3. Fermentation Gas Management: Monitor gas flow in bioprocessing and fermentation applications.
4. Propane Flow Measurement: Provide reliable readings for propane gas used in industrial processes.
5. Hydrogen Gas Monitoring: Ensure safe and precise hydrogen flow measurement in fuel and chemical applications.
6. Nitrogen and Argon Flow Control: Support industrial gas management and production with accurate flow data.
7. Medical Gases: Maintain precise flow control in healthcare environments for oxygen, nitrogen, and other medical gases.

For more precise info refer to our DOG datasheet.

DOG oscillation flow meter is ideal for applications involving digester gases and sewage treatment plants due to:

1. Insensitivity to Dirt, Moisture, and Aggressive Components: Ensuring reliable performance even in harsh environments.
2. Superior Reliability: Compared to other measurement principles, DOG meters offer stable and accurate results depending on humidity and gas composition.
3. Cost-Effective Solution: More affordable than ultrasonic meters, this options making them a practical choice for many facilities.

DOG oscillation flow meter offers versatile output options to meet various application needs, including:

1. Simple Frequency Output: Ideal for basic monitoring and control.
2. Consumption Metering: Accurately monitors gas consumption.
3. Meters for Changing Pressure and Temperature: Provides real-time monitoring with conversion of volumetric values into standard ubits or mass.
4. Flow Computers: Offers advanced analysis with separate inputs for pressure and temperature, ensuring precise data.

DOG oscillation flow meters offer a wide measuring range from 0.12 - 12 m³/h to 60 - 6000 m³/h, making them suitable for various industrial gas applications.

DOG oscillation flow meter is constructed using stainless steel and providing durability, corrosion resistance, and suitability for harsh environments.

The meters can withstand temperatures up to +120 °C under normal conditions and up to +60 °C for explosion-proof (Ex) models.

With an accuracy of ±1.5% of the reading, dog meter provides reliable and precise gas flow measurements across a wide range of applications.

1. No Moving Parts: Ensures low maintenance and long-term reliability.
2. Minimal Pressure Loss: Provides efficient and accurate measurement without significant impact on the gas flow.
3. High Accuracy: Maintains accurate readings even with fluctuating gas compositions.
4. Durability: Suitable for harsh and explosive environments due to its robust design.
5. Easy Maintenance: Allows on-site sensor replacement and straightforward maintenance.

To replace the hot wire sensor, turn off the flow of the medium and discharge the pressure in the lines. For versions with ball valves, simply shutting them is sufficient. Begin by opening the connection box using four screws and unclamping the hot wire sensor from the strip terminal. If necessary, due to limited space or tight cable arrangements, unclamp from the strip terminal, loosen the cable gland, and pull out the cable. Next, loosen the connection box from the plate using two screws. Carefully release the hot wire sensor screws and remove the sensor, ensuring that no sensor parts remain inside the device and that no foreign objects enter it. Reassembly is performed in reverse order, using the new O-rings supplied with the sensor and uniformly tightening the screws crosswise.

In case the internal section of the oscillator becomes contaminated by the medium or if foreign particles enter during sensor replacement, the device should be dismounted and cleaned. After unscrewing the connection box and removing the sensor, proceed to unscrew the upper plate screws, separate the parts, and clean the flow channel of the oscillator from both sides. To know more about the product, contact our technical support today!

KOBOLD has extensive experience in manufacturing reliable flow measurement solutions. The DOG Oscillation Flow Meter is designed specifically for dry and wet gases in industrial applications. As a trusted manufacturer, KOBOLD provides innovative and high-quality flow meters tailored to your needs.

To learn more about how the DOG Oscillation Flow Meter can benefit your application, call us or contact us via email. Our technical experts are ready to assist you.