Application of Delta Bar in Flow Measurement

Abstract: The application information of Delta Bar in flow measurement is provided by excellent flowmeter and flowmeter manufacturers. In today's industrial process automation, flow is an important process parameter. In order to effectively supervise, operate and control the production process, it is necessary to measure the flow of various media. The flow detection instrument or flow meter is to develop production, save energy and improve production. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the details of the application article of Deltaba in flow measurement. In today's industrial process automation, flow is an important process parameter. In order to effectively supervise, operate and control the production process, it is necessary to measure the flow of various media. Flow detection instrument or flow meter is an important tool for developing production, saving energy, improving product quality, improving economic efficiency and management level, and is one of the important instruments in industrial automation. There are many types of flow meters, each suitable for different occasions. According to the measurement method, they can be divided into mass flow meters, positive displacement flow meters and velocity flow meters. The velocity flow meters are further divided into electromagnetic flow meters, variable area flow meters gauges and differential pressure flow meters, etc. The Delta Bar described in this article is a differential pressure flow meter. 1 Introduction to Delta Bar Flowmeter Delta Bar is a flow measuring instrument jointly developed by German Cisco (Systec-Controls) and German Erlangen University in the 1990s, and began production in 1995. Sales. At present, it has been perfected to a full range of various specifications, and thousands of units have been sold and applied in 16 countries. 1.1 Measurement principle Differential pressure flowmeter is the most widely used and the most widely used flowmeter. The Delta Bar flowmeter also uses the principle of differential pressure measurement, which can be said to be a special throttling device. The throttling differential pressure measurement is based on the flow continuity equation (law of conservation of mass) and Bernoulli's equation (law of conservation of energy). The pipe is filled with fluid. When the fluid flows through the throttling member, it will form a local contraction at the throttling member, resulting in an increase in the flow rate and a decrease in the static pressure. A differential pressure is generated before and after the throttling member. Therefore, the flow rate can be measured according to the differential pressure. 1.2 Basic structure The Delta Bar flowmeter consists of four parts: the probe, the installation sleeve, the transmitter connection parts, and the differential pressure transmitter. The length of the Delta Bar probe is equal to the inner diameter of the pipeline. There are a row of unevenly distributed holes in the front and rear of the probe, with a diameter of 8mm, which are high pressure holes and low pressure holes. The high pressure holes always face the flow direction of the fluid. The pressure in the pipeline is averaged in the holes through the two rows of holes in the front and rear of the probe, and the differential pressure between the front and rear of the probe is obtained. The installation sleeve is the connection part between the delta bar and the pipeline. One side of the sleeve is welded with the pipeline, and the other side is connected with the delta bar. The connection form can be threaded or flanged according to the size of the pressure. The length of the casing is determined by the thickness of the pipe insulation. Delta Bar probe and transmitter connection parts have a variety of options, such as: ball valve, globe valve, 1/2NPT male thread or elliptical converter directly connected to the transmitter, etc. The connection components also include an integrated condenser for superheated steam media and an integrated temperature and pressure measuring device. The differential pressure transmitter squares and calculates the differential pressure signal provided by the probe to obtain the flow rate. According to the actual pressure difference generated by the probe, choose a transmitter with an appropriate range and accuracy. 2 Advantages of Delta Bar flowmeter 1) High precision, low straight pipe section requirements 3D) can reach an accuracy of 0.5%, and even with a fairly short straight pipe section (first 2D after 1D), it can reach 2% accuracy. This determines that Delta Bar can be used in harsh places with straight pipe sections, especially in large pipe diameters. 2) Large differential pressure, small pressure loss, and low operating cost Delta's special probe design determines that it can generate a larger differential pressure than other integrated probes during measurement, and the large differential pressure determines that the differential pressure transmitter has a large range. The measurement accuracy is also higher. The pressure loss of the flowmeter refers to the irreversible pressure drop caused by the primary equipment in the pipeline. In production, the pressure loss of the flowmeter should be reduced as much as possible. The pressure loss generated when using Delta Bar to measure is much smaller than traditional throttling equipment such as orifice plates. Due to the small pressure loss, the hydrodynamic loss of the pipeline is also small, the operating cost of the equipment is low, and the cost recovery is fast. 3) Wide application range Deltaba has a wide range of applications, and can measure various media such as dry gas, wet gas, liquid and steam, and is not limited by dielectric constant; pipeline type and plug-in type can be selected, and the measuring diameter is from 3mm to 15000mm. Suitable for square and round pipes of various diameters. For high temperature and corrosive media, special probe and pipeline connection materials can be used.

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