Common types of WAUKEE flow meters

Common types of WAUKEE flowmeters There are many types of flow measurement methods and instruments, and there are many classification methods. Before 2011, there were as many as 60 types of flow meters available for industrial use. The reason why there are so many varieties is that there is no flow meter that is suitable for any fluid, any range, any flow state and any use conditions. However, with the progress of the times, in this era of technological explosion, a flow meter has finally appeared. Product - mass flow meter. Mass flow meter is suitable for any fluid, any range, any flow state and any use conditions. However, it is relatively expensive and cannot be popularized in all industries. There are more than 60 types of old flow meters. Each product has its specific applicability and limitations.

According to the measurement objects, there are two categories: closed pipes and open channels; according to the measurement purpose, they can be divided into total measurement and flow measurement, and the instruments are called total meters and flow meters respectively. In addition, WAUKEE flowmeters can be divided into the following categories according to their measurement principles:

1. Mechanical principles: Instruments belonging to this type of principle include differential pressure type and rotor type using Bernoulli's theorem; impulse type and rotor type using momentum theorem. Moving tube type; direct mass type using Newton's second law; target type using the principle of fluid momentum; turbine type using the angular momentum theorem; vortex type and vortex type using the principle of fluid oscillation; pitot tube using the total static pressure difference Type, as well as volumetric type, weir type, trough type, etc.

2. Electrical principle: Instruments used for this type of principle include electromagnetic type, differential capacitance type, inductance type, strain resistance type, etc.

3. Acoustic principle: There is an ultrasonic type that uses the acoustic principle to measure flow. Acoustic type (shock wave type), etc.

4. Thermal principle: There are thermal type, direct calorimetric type, indirect calorimetric type, etc. that use thermal principles to measure flow.

5. Optical principle: Laser type, photoelectric type, etc. are instruments belonging to this type of principle.

6. Principles of atomic physics: Nuclear magnetic resonance type, nuclear radiation type, etc. are instruments that belong to this type of principle.

7. Other principles: There are labeling principles (tracing principles, nuclear magnetic resonance principles), related principles, etc.

This article explains the principles, characteristics, application profiles and performance of various flowmeters at home and abroad according to the most popular and extensive classification method at present: target type WAUKEE target type flowmeter is a flowmeter based on mechanical principles. , it has been developed and applied in industry for decades. The new SBL target flowmeter is a new type of capacitive induction flowmeter developed on the basis of the traditional target flowmeter with the development of new sensors and microelectronics technology. It has orifice plate, vortex and other flowmeters. It has the characteristics of no moving parts, and at the same time it has high sensitivity, accuracy comparable to volumetric flow meters, and a wide measuring range. China developed electric and pneumatic target flow transmitters in the 1970s. It is a testing instrument for electric and pneumatic unit combination instruments.

Since the force converter at that time directly used the force balance mechanism of the differential pressure transmitter, the use of this flow meter inevitably brought many defects caused by the force balance mechanism itself, such as the zero position is easy to drift, the measurement accuracy is low, and the reliability of the lever mechanism is poor. wait. Due to poor performance of the force balancing mechanism, many of the advantages of the target flowmeter itself have not been effectively brought into play, and users still have a bad impression of the old target flowmeter. The force converter of the new SBL target flowmeter adopts a strain gauge force converter, which eliminates the shortcomings of the above-mentioned force balance mechanism. The new target flowmeter also applies microelectronics technology and computer technology to the signal converter and display part. WAUKEE flow meters have a series of advantages and are believed to play an important role in many flow meters in the future. WAUKEE flowmeter SFV-2: WAUKEE flowmeter is divided into differential pressure flowmeter, rotor flowmeter, throttling flowmeter, slit flowmeter, volumetric flowmeter, electromagnetic flowmeter, ultrasonic flowmeter, etc. Classified by medium: liquid flow meter and gas flow meter.

Overview The English name of WAUKEE flowmeter is flowmeter, which is defined by the National Scientific and Technical Terminology Approval Committee as: an instrument that indicates the measured flow rate and/or the total amount of fluid within a selected time interval. A common type of WAUKEE flowmeter; simply put, it is an instrument used to measure fluid flow in pipelines or open channels. The commonly used unit in engineering is m3/h. It can be divided into instantaneous flow (Flow Rate) and cumulative flow (Total Flow). , the instantaneous flow rate is the amount that passes through the effective cross-section of a closed pipe or open channel per unit time. The material flowing through can be gas, liquid, or solid; the cumulative flow rate is the amount within a certain period of time (one day, one week, one month, one year) The cumulative amount of fluid flowing through the effective cross-section of a closed pipe or open channel. The cumulative flow can also be obtained by integrating the instantaneous flow with time, so the instantaneous flow meter and the cumulative flow meter can also be converted into each other. WAUKEE Flowmeter Differential Pressure Differential Pressure Flowmeter is an instrument that calculates flow rate based on the differential pressure generated by the interaction between the flow detection component installed in the pipeline and the fluid, the known fluid conditions and the geometric dimensions of the detection component and pipeline.

The differential pressure flow meter consists of a primary device (detection component) and a secondary device (differential pressure converter and flow display instrument). Differential pressure flowmeters are usually classified in the form of test pieces, such as orifice flowmeters, Venturi flowmeters, velocity-averaging tube flowmeters, Pitot tube principle-Bitopa flowmeters, etc. The secondary devices are various mechanical, electronic, electromechanical integrated differential pressure gauges, differential pressure transmitters and flow display instruments. It has developed into a large class of instruments with a high degree of three modernizations (serialization, generalization and standardization) and a wide variety of specifications. It can measure not only flow parameters, but also other parameters (such as pressure, level, density, etc.) ). The detection parts of differential pressure flow meters can be divided into several categories according to their working principles: throttling device, hydraulic resistance type, centrifugal type, dynamic head type, dynamic head gain type and jet type. Test parts can be divided into two categories according to their degree of standardization: standard and non-standard. The so-called standard detection parts only need to be designed, manufactured, installed and used in accordance with standard documents, and their flow values ​​and measurement errors can be determined without actual flow calibration. Non-standard test parts are test parts that are less mature and have not yet been included in the standard. Differential pressure flowmeter is the most widely used type of flowmeter. It is used in various types of flow instruments.Among them, its usage accounts for the largest proportion. Due to the advent of various new flow meters, its usage percentage has gradually declined, but it is still the most important type of flow meter. The fluid volume flow formula of differential pressure flowmeter is: v=aA √2/j(p-q)v--volume j--liquid density a--flow coefficient, which is related to the flow channel size pressure measurement method and flow rate announcement A-- Orifice plate opening area p-q--pressure difference