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Mastering Gas Flow Measurement with Ellenex PDT2 Differential Pressure Transmitter

Unlocking Precise Gas Flow Measurement with the Power of PDT2

PDT2-L | LoRaWAN Differential Pressure Transmitter With Built-in Temperature Sensor for Pressure and Flow Measurement of Gas Media
PDT2-L | LoRaWAN Differential Pressure Transmitter With Built-in Temperature Sensor for Pressure and Flow Measurement of Gas Media

In the world of industrial processes and manufacturing, precision is paramount. The accurate measurement of gas flow is essential for optimizing processes, ensuring safety, and maintaining efficiency. When it comes to measuring pressure and flow in gas media, precision and reliability are paramount. This is where Ellenex comes, a leading name in instrumentation technology, steps in with its cutting-edge product, the PDT2 Differential Pressure Transmitter with Built-in Temperature Sensor. PDT2 offers a comprehensive solution for accurate and efficient gas media measurement. In this blog, we'll delve into the intricacies of the PDT2 and learn how it works to provide precise gas flow measurements for a wide range of applications.

Understanding the PDT2

A Differential Pressure Transmitter (PDT) is an essential instrument used in various industries to measure the pressure difference between two points in a system. This technology is vital for applications such as gas flow measurement, filtration efficiency monitoring, and pressure control. The Ellenex PDT2 takes this concept to the next level with its unique features and built-in temperature sensor.

Why differential pressure monitoring is necessary?

Differential pressure monitoring in gas media is necessary for a variety of reasons in industrial, scientific, and commercial applications. It involves measuring the difference in pressure between two points within a gas-containing system. Here are some of the key reasons why it is important:

  1. Safety: Differential pressure monitoring is critical for ensuring the safety of gas systems. It helps detect any abnormalities or leaks by monitoring pressure differences, which can be a sign of a problem in the system. This early detection can prevent accidents, explosions, or the release of harmful gases.

  2. Process control: In many industrial processes, maintaining a specific pressure differential is essential for efficient and reliable operation. Monitoring these differentials allows for precise control of the process parameters, helping to optimize performance and product quality.

  3. Leak Detection: Differential pressure monitoring is an effective method for detecting leaks in gas systems. Any variation in pressure can indicate a potential leak or breach in the system, allowing for prompt maintenance and repair to prevent gas loss or environmental contamination.

  4. Air Filter: In applications where air or gas filtration is critical, differential pressure monitoring is used to assess the condition of filters. As filters become clogged with particles and contaminants, the pressure differential across them increases. Monitoring this differential allows for timely filter replacement, maintaining system efficiency and air quality.

  5. HVAC Systems: In heating, ventilation, and air conditioning (HVAC) systems, differential pressure monitoring is crucial to ensure proper air distribution and ventilation. It helps maintain the desired airflow and pressure differentials between various areas in a building.

PDT2-N | NB IoT - Cat-M1 Differential Pressure Transmitter With Built-in Temperature Sensor for Pressure and Flow Measurement of Gas Media
PDT2-N | NB IoT - Cat-M1 Differential Pressure Transmitter With Built-in Temperature Sensor for Pressure and Flow Measurement of Gas Media

How PDT2 Works: The Science Behind the Precision

The PDT2 operates on a simple yet effective principle: it measures the differential pressure across an obstruction in a gas flow, also known as a "flow element." This differential pressure is directly proportional to the flow rate of the gas. The PDT2 achieves this with the help of a built-in temperature sensor, making it an all-in-one solution for gas flow measurement.

Ellenex's PDT2 operates using Flow-through technology which involves a design that allows the fluid or gas being measured to flow through the instrument without causing obstructions or disturbances. This is important because it ensures that the pressure difference across the device accurately reflects the flow rate of the fluid or gas. This includes key features which are:

  1. Low Flow Resistance: Flow-through technology minimizes flow resistance, ensuring that the pressure drop across the device is as low as possible. This is important to maintain the accuracy of flow measurements, especially in situations where even minor restrictions could lead to inaccurate results.

  2. Minimized Turbulence: The design minimizes turbulence or disturbances in the fluid flow. Turbulence can lead to erratic pressure readings, so flow-through technology aims to maintain a stable and linear relationship between the pressure difference and the flow rate.

  3. Reduced Maintenance: Instruments with flow-through technology are often designed with features that reduce the accumulation of debris or contaminants, making them easier to maintain and less prone to clogging or fouling.

Here's a step-by-step breakdown of how it works:

  1. Pressure Measurement: The PDT2 starts by measuring the pressure of the gas at two different points: upstream and downstream of the flow element. These measurements are taken through separate pressure ports.

  2. Temperature Compensation: The PDT2 features a built-in temperature sensor, which continuously monitors the temperature of the gas. This is crucial because the density of gas varies with temperature. By accounting for temperature changes, the transmitter ensures that the measurements remain accurate even in dynamic conditions.

  3. Differential Pressure Calculation: The transmitter then calculates the difference between the two pressure measurements, taking into account the temperature-corrected values. This differential pressure is directly related to the flow rate of the gas.

  4. Signal Processing: The transmitter processes this differential pressure information and converts it into a standardized output signal, typically in the form of a 4-20 mA signal or a digital signal. This standardized output is used for further analysis and control in the industrial process.

Filter Performance Monitoring Installation Kit
Filter Performance Monitoring Installation Kit

Key Features of the Ellenex PDT2

  1. Built-in Temperature Sensor: One of the standout features of the PDT2 is its built-in temperature sensor. This feature allows users to simultaneously measure pressure and temperature, providing more comprehensive data for accurate flow calculations.

  2. High Accuracy: The PDT2 is known for its high accuracy and repeatability, making it suitable for critical applications in industries like petrochemical, pharmaceutical, and HVAC.

  3. Digital Communication: The transmitter supports various digital communication protocols, making it easy to integrate into existing control systems.

  4. Versatility: Whether you need to measure flow in gases, steam, or liquids, the PDT2 is versatile enough to handle various media.

  5. Compact Design: The transmitter's compact design makes installation convenient, even in tight spaces.

Applications of the PDT2

The versatility of the PDT2 opens up a wide range of applications, including but not limited to:

  1. Negative Pressure Monitoring in Hospitals

  2. Positive pressure monitoring in clean rooms

  3. Filter performance monitoring in HVAC Systems

  4. Airflow monitoring in HVAC systems

  5. Environmental Monitoring

The PDT2's capabilities are truly transformative for industries that rely on precise gas flow and pressure measurements.

Airflow Monitoring Installation Kit
Airflow Monitoring Installation Kit


Ellenex's PDT2, with its built-in temperature sensor and advanced pressure measurement technology, represents a remarkable step forward in gas media measurement. It offers the precision and reliability that industrial processes demand and simplifies the task of accurately monitoring gas flows. By combining a differential pressure transmitter with temperature compensation, the PDT2 ensures that gas measurements are not only accurate but also unaffected by variations in temperature. As industries strive for greater efficiency and accuracy, the PDT2 is set to become an essential tool in their arsenal. In a world that depends on precise measurements, the PDT2 stands out as an innovation that empowers industries to achieve their goals with confidence and accuracy.


To learn more about the application of PDT2 and how to select the correct range you need, please contact our technical team for support.


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