In this blog post, we discuss differential pressure transmitters - devices that play a key role in many industries, providing precise measurements and enabling efficient process control. You'll learn how differential pressure transmitters work, their types and applications. You will also discover how to select the right model for your needs and learn the advantages of using these devices. Read on!
The differential pressure transducer of pressure is a device used to measure the difference in pressure between two points in the system, for example, between the inside of a pipe and the outside. At its heart is a sensor that responds to the pressure difference, converting it into an electrical signal. This signal is proportional to the measured pressure difference. Depending on the type of pressure transducer, the sensor can use different methods to measure pressure, such as capacitance change in the case of capacitive transducers, material deformation in strain gauge transducers, or voltage generation in piezoelectric transducers. The output signal is then sent to a control or display system, where it is interpreted, allowing the pressure measurement in a given system to be monitored and controlled.
Diagram of the differential pressure sensor - The differential pressure sensor has two process connections. The pressures act in opposite directions on the diaphragm. The measurement result is always the difference of the two pressures p2 - p1 = ∆p. (pic)
Differential pressure transducers come in two basic types, which differ in operating principles and applications:
Choosing the right type of transducer depends on the requirements of the application, including accuracy, measurement range, and environmental resistance.
Multi-range differential pressure transmitter for non-aggressive gases. Constant overpressure protects against dust ingress.
Differential pressure transmitter MIDAS DP10 for use in filter monitoring or pump system control applications
Differential pressure transducer with safety chain capability
Differential pressure transducers are crucial in various industrial sectors, playing an essential role in the precise monitoring and control of processes:
Pipeline Monitoring: One of the common applications of differential pressure measurement is determining flow rate in pipelines using an orifice plate. This constriction reduces the pipe's cross-section, increasing flow velocity and causing a change in static pressure. Pressure is measured before and after the orifice, and the measured pressure difference is used to determine the flow rate. Such pressure monitoring in pipelines enables leak detection and optimization of raw material flow.
Extraction Processes: Help maintain stable extraction conditions, minimizing the risk of hazardous situations, such as gas explosions.
Reactor Monitoring: Crucial for monitoring pressure in chemical reactors, increasing safety and process efficiency.
Flow Systems: Facilitate the regulation of chemical flows, ensuring continuity and safety of production processes.
Process Control: Essential for monitoring conditions in production processes, especially in the manufacture of medicines and vaccines.
Clean Systems: Used to maintain appropriate environmental conditions in sterile environments, such as operating rooms or laboratories.
Flow Measurement and Filter Monitoring: Used for accurate measurement of substance flow and monitoring the condition of filters.
HVAC Systems: Used in managing air conditioning and ventilation, controlling airflow in buildings, maintaining optimal conditions. For example, in ventilation systems, differential pressure measurement is used to assess filter cleanliness. By measuring pressure on both sides of a filter, its condition can be determined. When the filter is contaminated, resistance to the passing air or other medium increases, resulting in a greater pressure difference. This increase in resistance is a direct indicator of the filter’s contamination level, allowing for an assessment of the need for its replacement or cleaning.
Process Automation: Used to monitor and regulate pressure in devices, enhancing production efficiency and safety.
Water and Wastewater Engineering: Responsible for monitoring and controlling water systems, from managing water levels to detecting leaks.
In rail transport, these transducers are used to monitor pressure in braking systems, ensuring safety and reliability. Precise pressure measurements are critical for the proper functioning of brakes and other crucial rail systems.
In each of these applications, differential pressure transducers provide accurate information necessary for effective process management, enhancing safety, energy efficiency, and overall operational performance.
One common application of differential pressure measurement is to determine the flow rate in pipelines
Differential pressure transducers are also used as hydrostatic probes to measure levels in closed tanks. This measurement technique is crucial in many industries, from the chemical industry to food processing. They work by measuring the pressure difference between two points in a tank - at the bottom and top. This pressure difference is directly related to the height of the liquid column, allowing the level of the liquid to be accurately determined. This method is particularly useful in conditions where direct contact with the fluid is undesirable or impossible, such as with toxic, corrosive or high-pressure substances. This technique is highly effective even under difficult conditions, such as agitation of the fluid, the presence of foam, extreme temperatures or varying tank pressure. Using differential pressure transducers for this purpose not only ensures accuracy, but also increases safety and operational efficiency in tank management. In addition, they feature easy installation and quick start-up, making them extremely convenient for daily use.
Level measurement in closed tanks using differential pressure transducers
Differential pressure transducers designed for use in explosion-hazard areas, known as Ex zones, must meet strict safety and durability standards. They are engineered to operate safely in potentially dangerous environments where flammable gases, liquids, or dusts are present. Key aspects of these devices include:
It is important to note that specific requirements may vary depending on the specifications of a particular model and the operating conditions in which it will be used.
An example of a differential pressure transducer meeting the above requirements is the dTRANS p20 DELTA Ex d.
The permissible ambient temperature for JUMO dTRANS p20 differential pressure transducers varies depending on the version:
Additionally, the maximum permissible temperature of the medium with which the transducer can operate also varies depending on the temperature class:
Differential pressure transmitter for ex zone dTRANS p20 DELTA Ex d
My name is Ewelina Szmit and I have been working in the field of content marketing for several years, combining my professional skills with my passion for writing. I believe that even the most technical topics can be presented in an interesting and accessible way for everyone. Outside of work, I develop my creativity by creating newspaper collages. I like to spend my free time most actively, walking my dog or running.
