Differential pressure flow meters

How to measure flow rate based on differential pressure? Flow meter with differential pressure transducer

Measuring flow rate is extremely important for effective process management in many industries. One method of determining flow rate is based on the differential pressure, generated by either an orifice meter or downpipes. The most popular flowmeters using this principle are orifice flowmeters and Pitot tube flowmeters. From this blog post you will learn what differential pressure flow rate measurement is all about, learn the most important information about flow meters and the advantages of this method. You will learn about industrial applications and why these solutions are indispensable in the petrochemical, energy or HVAC sectors. Read on and learn how to improve your production processes with precise flow measurement!

Measurement of flow rate based on differential pressure

Flow rate measurement based on differential pressure is one of the most common methods used in industry to monitor and control the flow of liquids and gases. This uses differential pressure transducers, also known as DP transducers, which are placed across an obstruction, such as a measuring orifice or Pitot tube, resulting in a pressure drop proportional to the fluid flow. The transmitter measures the differential pressure and calculates the flow rate based on these values. Thanks to the high sensitivity of the sensors and minimal errors, flow rate measurements are very precise. The transducers convert the pressure difference into an electrical signal, which is then analyzed and converted into a flow rate value, ensuring accuracy and reliability in a variety of industrial applications.

What are the types of differential pressure (DP) flowmeters?

Differential pressure (DP) flowmeters are widely used in many industries because of their precision and reliability. There are several types of DP flowmeters, which differ in design and operation, but all calculate the flow rate based on differential pressure. The most common types are orifice flowmeters and Pitot tube flowmeters. Both types have their specific advantages and are chosen depending on the application needs, operating conditions and measurement accuracy requirements. Choosing the right DP flowmeter depends on many factors, such as the type of fluid, flow range, accuracy requirements and installation and operating costs.

Flow meter with orifice and differential pressure transmitter

Flowmeters with an orifice are among the most commonly used differential pressure flowmeters. In this configuration, the orifice, which is a thin metal plate with a hole placed in the pipe, causes a pressure drop in the flowing fluid. The transmitter measures the pressure upstream and downstream of the orifice. The pressure difference resulting from the flow through the orifice is then converted into an electrical signal that can be analyzed to determine the flow rate. Orifice flowmeters are particularly valued for their simple design, low installation and operating costs, and high reliability. They are widely used in the petrochemical, power and water supply industries.

Flow measurement with orifice plate and differential pressure transmitter JUMO flowTRANS DP R01/R02 (409602)

Flow measurement with orifice plate and differential pressure transmitter JUMO flowTRANS DP R01/R02 (409602)

Flow meter with Pitot tube and differential pressure transducer

Pitot tube flowmeters are another popular type of differential pressure flowmeters. A Pitot tube is a device consisting of two tubes: one measuring dynamic (total) pressure and the other measuring static pressure. The difference between the two values is proportional to the speed of the fluid flow. The transducer converts this pressure difference into an electrical signal that can be used to calculate the flow rate. Pitot tube flowmeters are often used in applications where it is important to minimize pressure losses, such as in HVAC systems and the aerospace industry, where precise measurement of air flow is crucial to the efficiency and safety of operations.

Flow Measurements with Pitot Tube and Differential Pressure Transmitter JUMO flowTRANS DP P01/P02/P03/P04 (409601)

What are the benefits of differential pressure-based flow measurement?

Flow rate measurement based on differential pressure offers a number of advantages that make this method extremely attractive to a wide range of industries, including petrochemical, power generation, water supply and HVAC. One of the most important advantages is the wide range of measurement ranges available for differential pressure transmitters. As a result, this method can be used to measure both small and large flow rates, making it applicable to a variety of industries. This is particularly important, for example, in the chemical and petrochemical industries, where precise measurement of small flows is crucial for controlling chemical reactions.

In addition, differential pressure transmitters exhibit high sensitivity, enabling accurate flow monitoring even at small differences. In addition, it is a relatively cost-effective solution, of particular interest to companies that want to maintain high quality measurements while reducing costs.

Flow measurement based on differential pressure –  summary

Differential pressure flow meters offer a wide range of measurement ranges, allowing them to be used in a wide variety of industrial applications, from precision measurement of small flows in the chemical industry to large flows in water supply systems. They are also a cost-effective solution, making them attractive to companies looking for efficient and cost-effective flow monitoring methods. Differential pressure transmitters can detect even very low pressure differences, allowing accurate flow monitoring under a wide variety of operating conditions.

These advantages make differential pressure transmitters a versatile and reliable tool for managing the flow of liquids and gases in various industries such as petrochemicals, power generation and HVAC systems.

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About the author

My name is Ewelina Szmit and I have been working in content marketing for several years, combining my professional skills with my passion for writing. I am convinced that even the most technical topics can be presented in an interesting and accessible way for everyone. Outside of work, I unleash my creativity by creating newspaper collages. I like to spend my free time being active, walking my dog or running.

Ewelina Szmit


Ewelina Szmit - Content specialist +48 71 339 32 94 Ewelina.Szmit@jumo.net +48 71 339 32 94

Katarzyna Tracz

Technical specialist

Katarzyna Tracz - Inside Sales Engineer +48 71 339 32 86 Katarzyna.Tracz@JUMO.net +48 71 339 32 86


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