| Customization: | Available |
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| Accuracy: | >±1% |
| Main Application: | Water, Wastewater, Diesel Fuel |
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Accurate measurement of fluid flow is crucial for resource management, process control, and optimization of equipment operation in industrial production and daily life. Wall mounted ultrasonic flowmeter, as an advanced flow measurement device, has been widely used in many fields due to its unique working principle and significant advantages.
1, Working principle
The wall mounted ultrasonic flowmeter is mainly based on the principle of velocity difference method to measure the flow rate of liquid inside a circular tube. The working process is as follows: when the ultrasonic beam propagates in a liquid, the flow of the liquid will cause a small change in propagation time, and the change in propagation time is proportional to the flow velocity of the liquid. In the zero flow state, the time required for two sensors to emit and receive sound waves is exactly the same, which is also a unique technical manifestation of its ability to actually measure zero flow. When the liquid flows, the transmission time of sound waves in the upstream direction is greater than that in the downstream direction. By accurately measuring the difference in the transmission time of sound waves in the upstream and downstream directions, combined with parameters such as the propagation speed of ultrasound in the liquid, a specific algorithm can be used to accurately calculate the flow velocity of the liquid, and then the fluid flow rate can be obtained based on the cross-sectional area of the pipeline. For example, in a pipeline with a diameter of DN100, by measuring the subtle difference in the propagation time of ultrasonic waves in the upstream and downstream directions, the flow rate of the liquid in the pipeline can be accurately calculated.
2, Product Features
The measurement results are stable and reliable: the number of samples per cycle has been significantly increased to 128, greatly enhancing the stability of the measurement and effectively meeting the flow measurement needs of the vast majority of clean water, sewage, and various chemical liquids. Even in complex detection environments such as electromagnetic interference and pipeline vibration, the interference of these adverse factors on measurement results can be greatly reduced, ensuring the accuracy and reliability of measurement data.
Flexible and diverse power supply: The use of electrically isolated DC power supply significantly improves the reliability and anti-interference performance of the host. For special situations where there is no power supply on site, users can also choose a 15W solar panel paired with a 24V/30AH lead-acid battery pack, and this power supply system can achieve continuous power supply for a week on cloudy days, providing convenience for use in places without conventional power sources such as wilderness and remote areas.
Rich and compatible communication protocols: The measurement motherboard is equipped with a standard isolated RF-485 interface, which can support both MODBUS and M-BUS standard protocols simultaneously, and is fully compatible with the communication protocol of the original ultrasonic flowmeter and various flowmeter and water meter protocols produced by the company. This enables it to seamlessly integrate with various automation control systems, data acquisition devices, etc., achieving fast data transmission and sharing.
Convenient function expansion: The measurement motherboard is equipped with a serial expansion bus interface, and users can choose various function expansion modules for function expansion according to their actual needs. The expandable features are rich and diverse, including 4-20mA current loop output, frequency signal output, large capacity data recording, thermal printer and other functions. For example, in scenarios where traffic data needs to be remotely transmitted to the monitoring center for centralized management, it can be achieved by adding a 4-20mA current loop output module; If you want to record and analyze traffic data in detail over a period of time, you can choose a high-capacity data recording module.
Complete heat measurement function: The motherboard has two three wire PT100 platinum resistor input circuits, which can be easily converted into a complete ultrasonic calorimeter by simply connecting the platinum resistor. At the same time, the temperature difference sensitivity function has been added to effectively prevent the ineffective accumulation of heat during long-term low flow rates or low temperature differences, ensuring the accuracy of heat measurement. In the heating system, accurate measurement of key parameters such as heating capacity and heat loss provides strong support for energy-saving management and cost accounting of heating enterprises.
Practical Analog Input Circuit: The motherboard has three analog input circuits that can input physical quantities such as pressure and liquid level, making it suitable for use as a simple RTU (Remote Terminal Unit). In some industrial production processes, by simultaneously measuring parameters such as flow rate, pressure, and liquid level, it is possible to comprehensively and accurately monitor and optimize the entire production process.
Thoughtful fault monitoring: The software operation window has specially added a fault timer (located in menu M+9). When the instrument cannot measure normally, the time value will automatically increase. This function facilitates users to detect instrument faults in a timely manner and record the duration of the faults, providing important reference for subsequent repair and maintenance work.
Rich language interface: With up to 8 different language interfaces for customers to choose from, it meets the usage needs of users in different countries and regions, and improves the universality and usability of the product. Whether in the domestic or international market, users can easily operate and understand the various functions of the instrument.
3, Technical parameters
Host parameters
Accuracy: 1.0%, ensuring high measurement accuracy and providing reliable data for flow measurement.
Repeatability: 0.2%, indicating good consistency in measurement results when measuring the same flow rate multiple times.
Maximum flow velocity: 6m/s, suitable for flow measurement scenarios with various flow velocity ranges.
Measurement cycle: 500ms (2 times per second, 128 sets of data collected per cycle), fast data collection frequency ensures timely capture of changes in flow rate.
Measurement principle: Ultrasonic time difference principle, using 4-byte IEEE754 floating-point operation to ensure the accuracy and stability of data calculation.
Display interface: It can be connected to 2 × 10 backlit Chinese characters or 2 × 20 character LCD displays, making it convenient for users to intuitively read measurement data.
Operation mode: Supports external 16 key touch keyboard and PC computer parameter setting software, with convenient and flexible operation. Users can choose the appropriate operation mode according to their actual needs.
Input interface: 3-channel 4~20mA input is optional, with an accuracy of 0.1%. It can input signals such as pressure, liquid level, temperature, etc., and can also be used as a digital interface; Simultaneously equipped with two three wire PT100 platinum resistance input circuits, it can achieve heat metering function (enthalpy difference method).
Output interface: Current signal (optional module) is 4-20mA, impedance is 600 Ω floating, accuracy is 0.1%; Frequency signal (optional module) can be selected between 1~9999Hz, OCT output; Equipped with pulse signals, including positive, negative, net flow and heat accumulation pulses, dual OCT outputs (with one pulse width programmable between 6-1000mF, default 200mF); The alarm signal is a dual channel OCT output, with nearly 20 source signals available for selection; The data interface is an isolated RF485 serial interface.
Communication protocol: Supports MODBUS protocol, MBUS protocol, FUJI extension protocol (compatible with the communication protocol for flow meters and water meters of Huizhong Company), recommended to use MODBUF-RTU protocol or MODBUS ASCII protocol.
Other functions: automatic memory of accumulated traffic and work status for the previous 64 days, 32 months, and 2 years; Automatically remember the first 16 power on/off times and flow rate, and can achieve automatic or manual replenishment; One bidirectional serial interface can connect multiple external devices such as 4-20mA and data loggers; The working parameters can be fixed in the FLAFH memory inside the machine and automatically retrieved when powered on.
Working current: 50mA (without connecting the keyboard display and buzzer), low power consumption, energy-saving and environmentally friendly.
Backup current: Use CR2032 to maintain 100000 hours of data without loss under 24VDC power outage conditions, ensuring data security and continuity.
Environmental temperature: -10 ºC~70 ºC (please contact the manufacturer for temperature requirements above this range), can adapt to a wide range of environmental temperatures, and can work stably in different regions and seasons.
Working hours: Continuous, meeting the demand for long-term uninterrupted operation.
Sensor parameters
External clamp M2 suitable pipe diameter: DN50~700mm, Can adapt to the installation requirements of pipelines with various diameters.
Signal cable: Dedicated, factory standard 5-meter, single cable can be extended up to 500 meters in specific occasions (not recommended) to ensure stable signal transmission.
Protection level: IP68 (can work in water immersion), with good protection performance, can work normally even in harsh environmental conditions.
Measurable pipeline materials: suitable for all materials of dense pipelines such as steel, stainless steel, cast iron, PVC, PE, PPR copper, aluminum, cement pipes, etc., with lining allowed (plastic should be controlled with a wall thickness of less than 8mm as much as possible, otherwise it will not be measurable if it is not dense), with a wide range of applications.
The length requirement for the straight pipe section is: upstream ≥ 10D, downstream ≥ 5D, and distance from the pump outlet ≥ 30D to ensure measurement accuracy.
Measurable types and related parameters of fluids in pipelines: for water, turbidity ≤ 20000ppm, the measurement effect of sewage is good, and the vast majority of sewage pipelines can be stably measured; The temperature range is -40 ºC~160 ºC; It can measure the forward and reverse flow separately and measure the net flow.
4, Application Fields
Water supply and sewage treatment industry: In urban water supply systems, it can be used to monitor the inflow and outflow of raw water from water plants, the outflow of clean water, and the flow of various nodes in the pipeline network, helping water supply enterprises to allocate water resources reasonably and ensure the stability and safety of water supply. In sewage treatment plants, it is possible to accurately measure the inflow and discharge of sewage after treatment, providing key data for optimizing the control of sewage treatment processes and ensuring that sewage treatment meets discharge standards. For example, by monitoring the flow changes of each treatment stage in the sewage treatment plant in real time, adjusting the operating parameters of the treatment equipment in a timely manner, improving the efficiency of sewage treatment, and reducing operating costs.
Industrial production process: widely used in various liquid raw materials, intermediate products, and finished products for flow measurement in industrial fields such as chemical, petroleum, power, and metallurgy. Accurately measuring the flow rate of reaction materials is crucial for ensuring the stability of chemical reactions and product quality in chemical production; In the process of oil extraction and transportation, real-time monitoring of the flow of crude oil and refined oil can be achieved to achieve accurate measurement and scheduling; In the power industry, it can be used to measure the flow of circulating water, condensate water, etc., optimize the operating efficiency of the unit, and ensure the safety and stability of power production. For example, in the pipeline transportation system of petrochemical enterprises, wall mounted ultrasonic flow meters can accurately measure the flow rate of various petrochemical products, providing accurate basis for production management and cost accounting of enterprises.
Heating and cooling system: As an important component of ultrasonic calorimeter, it plays a crucial role in the field of heating and cooling. In the centralized heating system, the hot water flow rate and heating capacity in the heating pipeline can be measured to help heating enterprises achieve heat based charging and promote energy conservation and emission reduction. In the central air conditioning system, it is possible to monitor the flow of chilled water and cooling water, optimize system operation, improve refrigeration efficiency, and reduce energy consumption. For example, in the central air conditioning system of large commercial buildings, wall mounted ultrasonic flow meters are installed to monitor real-time changes in the flow of chilled water and cooling water, adjust the operating parameters of refrigeration units according to actual needs, and achieve energy-saving operation.
Agricultural irrigation: In the field of agricultural irrigation, it can be used to measure the flow rate of irrigation water, helping farmers to control the amount of irrigation water reasonably and achieve precise irrigation. By accurately measuring irrigation flow, water resource waste can be avoided, water resource utilization efficiency can be improved, and scientific irrigation can be carried out according to the water demand of crops, promoting crop growth and improving agricultural production efficiency. For example, in large-scale agricultural irrigation projects, the use of wall mounted ultrasonic flow meters can accurately control the amount of irrigation water, ensuring that each piece of farmland can receive appropriate irrigation, which not only meets the needs of crop growth but also saves water.
Wall mounted ultrasonic flow meters have become an indispensable and important equipment in the field of modern flow measurement due to their advanced working principles, excellent product performance, and wide application areas. With the continuous advancement of technology and the increasing demand for applications, wall mounted ultrasonic flow meters will play a greater role in more fields, providing strong support for the efficient operation and sustainable development of various industries.
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