The portable ultrasonic flowmeter is suitable for online calibration and inspection measurement of liquid flow in various industrial sites. It has the characteristics of simple operation, good consistency, online printing, and long battery power supply time.
Manufacturer of portable ultrasonic flowmeter
Portable ultrasonic flowmeter: When ultrasonic waves propagate in a flowing fluid, they carry information about the fluid velocity. Therefore, by receiving ultrasonic waves, the flow velocity of the fluid can be detected and converted into flow rate. According to the detection method, ultrasonic flow meters can be divided into different types such as propagation velocity difference method, Doppler method, beam offset method, noise method, and correlation method. Ultrasonic flowmeter is a non-contact instrument that has only been applied in the past decade with the rapid development of integrated circuit technology. It is suitable for measuring fluids that are difficult to contact and observe, as well as large pipe flow rates. It can be linked with a water level gauge to measure the flow of open water. The use of ultrasonic flow does not change the flow state of the fluid and does not generate additional resistance, as it does not require the installation of measuring elements in the fluid. The installation and maintenance of the instrument do not affect the operation of the production pipeline, making it an ideal energy-saving flowmeter.
The portable ultrasonic flowmeter utilizes the principle of low voltage and multi pulse time difference, and adopts high-precision and ultra stable dual balanced signal differential transmission and differential reception digital detection technology. When the ultrasonic beam propagates in the 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. When there is zero flow, the time required for two sensors to emit and receive sound waves is exactly the same (the only technology that can actually measure zero flow). When liquid flows, the sound wave transmission time in the upstream direction is greater than that in the downstream direction.
Working principle of portable ultrasonic flowmeter
Ultrasonic flowmeter is a device that measures fluid flow velocity by detecting the effect of fluid flow on ultrasonic beams. According to the detection method of signals, it can be divided into propagation velocity difference method, Doppler method, beam offset method, noise method, and correlation method. The Doppler method utilizes the principle of acoustic Doppler to determine fluid flow rate by measuring the ultrasonic Doppler frequency shift scattered by scatterers in non-uniform fluids. It is suitable for measuring fluid flow rates containing suspended particles, bubbles, and other substances. The beam offset method uses the deviation of the propagation direction of the ultrasonic beam in the fluid as the fluid velocity changes to reflect the fluid velocity. At low flow velocities, the sensitivity is low and the applicability is limited. The widely used measurement principle currently is the “time difference method”. Combining multi pulse technology, digital information processing technology, and signal processing circuits to display measurement data in real-time.
The “time difference method” is to generate ultrasonic signals by sending sensors and emit them into the air flow. The signals pass through the pipe wall and fluid to the receiving sensor, and at the same time, the receiving sensor emits the same ultrasonic signals. The signals pass through the pipe wall and fluid to the sending sensor. At this point, due to the presence of flow velocity, the time difference can be used to calculate the flow velocity and subsequently the flow rate.
| Measurement accuracy | Better than 1% |
| repeatability | Better than 0.2% |
| Working power supply | 220VAC (standard), 110VAC (optional) |
| Measurement period | 500ms(2 times per second, 128 sets of data collection per cycle) |
| battery | Built-in Ni-MH rechargeable battery can work continuously for 24 hours |
| Installation mode | External binding installation |
| reveal | 2*10 Chinese character backlit display (instantaneous flow, cumulative flow, signal status, etc.) |
| Signal output | Isolated RS485 |
| Communication protocol | MODBUS protocol, M-BUS protocol, FUJI extension protocol, and compatible with other domestic manufacturers of similar products of the communication protocol |
| printout | Built-in thermal printer for real-time or timed printing |
| Data storage | Optional built-in memory (SD card) can store time, instantaneous flow, cumulative flow, signal status, etc., and can import data to the computer (data storage and printing function can only choose one) |
| Caloric function | Optional PT100 externally clipped platinum resistor can realize heat metering |
| Other functions | Self-diagnosis, indicating whether the current working status is normal |
| Optional sensor | External clip-on, plug and pull interface |
nstallation precautions
- Observe whether the installation site pipeline meets the requirements of a distance of 10D before and 5D after the straight pipe section, as well as a distance of 30D from the pump. (D is the inner diameter of the pipeline)
- Confirm the fluid medium inside the pipeline and whether it is full.
- Confirm the material and wall thickness of the pipeline (fully considering the thickness of scaling on the inner wall of the pipeline)
- Confirm the service life of the pipeline. For pipelines with a lifespan of around 10 years, even if they are made of carbon steel, it is recommended to use plug-in installation.
- After completing the first four steps, it can be confirmed which sensor to use for installation
- Start inputting parameters into the table body to determine the installation distance.
- Very important: accurately measure the installation distance.
The ultrasonic flowmeter uses an external clamp sensor to measure liquid flow rate. The installation process is extremely simple, with a fully Chinese human-machine interface that is easier to operate. Specially suitable for flow balance testing and flow monitoring: drinking water, river water, seawater, cooling water, hot water, industrial wastewater, lubricating oil, diesel, fuel chemical liquids, etc.