DHE-FL series gas ultrasonic flow meter
Gas ultrasonic flow meter refers to a device based on the propagation speed of ultrasonic waves in the flowing medium equal to the average flow speed of the measured medium.A flow meter developed based on the principle of the vector sum of the velocities of sound waves in stationary media.
The ultrasonic flowmeter developed by our company is based on the principle of "time difference method" and adopts advanced multi-pulse technology, digital signal processing technology and compensation technology, so that the flowmeter can better adapt to the environment of the industrial site and make measurement easier. , economical and accurate.
DHE-FL-GP pipe segment gas ultrasonic flow meter
Gas ultrasonic flow meters are mainly used to measure the volume flow rate under working conditions, and then obtain the standard volume flow rate based on the temperature and pressure values under working conditions. It has a wide measurement range and high measurement accuracy, and can be suitable for flow rate measurement of a variety of gas media, such as natural gas, coal bed methane, ethylene, etc.
The DHE-FL-GP pipe-type gas ultrasonic flowmeter produced by our company can be used for the distribution of urban gas pipeline networks and the trade measurement of urban gas under low-pressure conditions for end users. It can also be used for processes in other industrial control and fields. At the same time, it can replace traditional mechanical flow meters, reduce the maintenance cost of flow meter products, improve the operation and management efficiency of gas companies, and lead the new development of the metering industry in the urban gas field.
Structural Composition
DHE-FL-GP pipe segment gas ultrasonic flow meter mainly consists of meter body (pipe segment), rectifier, transducer (ultrasonic sensor), pressure sensor component, temperature sensor component, transmitter, measurement module, lithium battery pack, converter It is composed of connecting columns, etc. The specific structural composition is shown in the figure below:
Structural diagram of gas ultrasonic flow meter
Working Principle
The ultrasonic flowmeter adopts the propagation time difference principle with good repeatability. Its working principle is shown in the figure below:
（Working principle of time difference ultrasonic flowmeter）
Upstream sensor A and downstream sensor B are installed coaxially and facing each other.
The angle between the axis center line and the pipe axis is 0
Sensor sound path distance L
Pipe inner diameter d
Install one or more groups of ultrasonic sensors in the pipe section of the surface body, and measure the arrival time of sound waves between each other at the same time. According to the superposition principle of sound speed and flow velocity, there will be a time difference between the uplink time and downlink time of sound wave propagation of each group of ultrasonic sensors. Use high-precision The cross-correlation algorithm calculates its time difference and calculates its flow rate according to the formula.
Sound wave propagation path of different temperature type sensors
General temperature measurement
Extreme temperature measurement
Main Features
The DHE-FL-GP pipe segment gas ultrasonic flow meter adopts an integrated and compact design, which is easy to install and maintain on site. At the same time, the product integrates temperature and pressure sensors and has the function of a volume corrector, which can significantly reduce product use and maintenance costs.
Technical Advantages
Long Term Stability
Using ultrasonic measurement technology without any mechanical movable parts can minimize the impact of internal contamination on measurement, and will not cause measurement deviations due to wear and tear of mechanical movable parts;
Wide Flow Measurement Range
Using a unique transducer (ultrasonic sensor) layout design and a special calculation model, it has a wide flow measurement range and a wide range ratio, up to 1:160, which can help customers achieve accurate measurement within a larger flow range;
Adaptable to harsh working conditions
In view of the turbulence working conditions and noise interference, a special built-in rectifier is designed, and the configuration requirements for the front and rear straight pipe sections are low to meet the requirements of different working conditions;
Multi-channel layout design
Adopting a through-beam multi-channel arrangement, it has high noise immunity, can effectively deal with eddy currents and asymmetric fluids, and improves the measurement accuracy of the flow meter. At the same time, multi-channel can be used as redundant backup. Even if individual sensors are damaged, the flow meter can still work normally, which greatly improves the reliability of measurement;
Stainless steel precision casting watch body
The meter body is made of stainless steel investment casting and has good corrosion resistance. Compared with the welded meter body, it has less deformation and lower risk of leakage, which can effectively improve the measurement accuracy and service life of the product.
Operating software
It is equipped with background monitoring software, which can be connected to each flow meter through the network, allowing convenient and efficient management and data collection of the flow meter. The software provides many logs and auxiliary functions to help users better use the flow meter;
Explosion-proof level
Explosion-proof structural design, safe and reliable performance, explosion-proof mark: Exdb mb IC T6 Gb;
Various signal outputs
A variety of signal outputs can meet different functional needs on site;
Protection Level
The flow meter protection level is IP66/68;
LCD display
Accumulated flow, working condition flow, standard condition flow, flow speed, temperature, excitation, battery power, etc.
High reliability
The secondary transmitter (meter head) has a built-in auxiliary lithium battery, which can still ensure the normal operation of the flow meter in the event of an emergency power outage and has high reliability;
