Flowmeters are devices that use simple physics theories related to fluid flow conditions to calculate the speed, flow rate, other parameters of fluids. For example, most ultrasonic flowmeters work based on the Transit Time theory. In this method, audio signals are sent and received along the diameter of the pipe. The difference in wave travel time is directly proportional to the average flow velocity.
Ultrasonic flowmeters have brought a new definition of ease of use or user-friendliness to industrial plants. Installation, commissioning, calibration and maintenance of these equipment are very easy and low-cost. The combination of these factors with high measurement accuracy has made ultrasonic flowmeters one of the first choices of control and instrumentation professionals today.
Clamp-On Ultrasonic Flowmeters in two types, fixed and portable, can be installed and set up to measure fluid flow without any need to cut the pipes or shutdown. Portable flowmeters are available only with ultrasonic technology and can be a good reference for measuring the performance of fixed flowmeters as well as periodic measurements at different points of the industrial site.
Ultrasonic flowmeters work based on the transit time theory. In this method, audio signals are sent and received along the diameter of the pipe. The difference in the wave travel time is directly proportional to the average flow speed.
Mass flowmeters work based on the Coriolis law and are therefore also known as Coriolis flowmeters. The mass flow rate of liquids and gases can be calculated based on the deformation caused by the movement of the fluid in the measuring tube. Fluid density can also be calculated using the resonance frequency of the tube. Two sensors calculate the Coriolis force. If there is no fluid flowing in the pipe, these two sensors receive and report the same sinusoidal signal, but as soon as the fluid flows, the Coriolis force will lead to the deformation of the pipe and create a phase difference between the signals received in the two sensors. This phase difference is directly related to the mass flow rate of the fluid.
Vortex flowmeters are a type of flowmeter that work based on the vortex phenomenon in fluid flow. In the construction of these types of flowmeters, a flow disrupting element is used, which leads to the creation of a vortex in the fluid flow. The frequency of the generated flow is directly related to the fluid speed. These flowmeters have very high accuracy and stability compared to other flowmeters, which makes Vortex flowmeters one of the best options for industrial sites.
More than a century has passed since the history of using pressure difference flowmeters to measure fluid flow. In this technology, pressure is measured at two points before and after a limiting element, and according to Bernoulli’s rule, this pressure difference is converted into fluid velocity. One of the most common limiting elements are orifice plates. With the help of the orifice plate, the flow rate of liquids, gases and steam can be calculated. The specifications of orifice plates are determined internationally based on the ISO 5167 standard.
In 1832, Michael Faraday’s efforts to find a connection between the magnetic flux caused by the current passing through a closed circuit and the induced driving force led to the establishment of Faraday’s law of electromagnetic induction. As one of the results of this law and in simple words, Faraday, a British physicist, showed that whenever an electrically conductive fluid passes through an electromagnetic field caused by an electric circuit, it leads to the creation of an induced voltage in the circuit based on the relationship E=k*B*D *V will be As we can see, the generated voltage is directly related to the speed of the fluid, and in this way, the speed of the fluid in the pipes can be calculated.
The induced voltage will be measured and transferred to the transmitter through two electrodes in direct contact with the fluid or capacitive electrodes without contact with the fluid. Inside the transmitter, this signal will be a standard 4-20mA signal or a frequency/pulse signal, and after being transferred to the control system, it can be processed and used.
Flowmeters for measuring fluid flow are accurate instruments that are widely used in various industries. There are several types of these flowmeters, including ultrasonic, Coriolis, vortex, differential pressure, electromagnetic, and variable level. Each of these flowmeters have their own advantages and applications and are suitable for different operating conditions.
Ultrasonic flowmeters are very popular due to their ease of installation and high accuracy. Coriolis flowmeters are suitable for accurate mass flow measurement. Electromagnetic flowmeters are ideal for conductive fluids, while variable level flowmeters are suitable for simple applications that do not require electricity.
Choosing the right flowmeter depends on several factors, including the type of fluid, required accuracy, operating conditions, and installation constraints. To ensure that you choose the best flowmeter for your specific needs, consultation with experts in the field is recommended.
As a specialized supplier of all types of flowmeters and flow measurement equipment, HIWACO is ready to meet your needs in the field of fluid flow measurement by providing quality products and professional support services.
Ultrasonic flowmeters have several advantages, including: easy installation without the need to interrupt the flow, high accuracy, no contact with the fluid, and the ability to measure a wide range of fluids.
Choosing the right flowmeter depends on many factors, including: fluid type, operating temperature and pressure, required accuracy, installation constraints, and budget. It is recommended to consult with experts in this field to choose the best option.
No, electromagnetic flowmeters are only suitable for electrically conductive fluids. These flowmeters work well for conductive liquids, pastes and slurries, but are not suitable for gases or non-conductive liquids such as crude oil.
The main advantage of Coriolis flowmeters is their ability to measure mass flow directly, without the need for temperature or pressure correction. These flowmeters are also very accurate and can also measure fluid density.
You can submit your flowmeter purchase orders to HIWACO. This company is a specialized supplier of all types of flowmeters and flow measurement equipment and is ready to meet your needs in this field by providing quality products and professional support services.
Hiwa Tajhiz Iranian Co. is a leading company in the field of instrumentation, control and measuring equipment in Iran with the aim of equipping various industries of the country with the most up-to-date devices of international reputable manufacturers, and relies on the technical knowledge of local specialists for all installation services. HIWACO provides all installation, repairs and maintenance services of the mentioned equipment.
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