When an ultrasonic beam propagates in a liquid, the flow of the liquid will cause a slight change in propagation time, which 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 (a 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.
The relationship conforms to the following expression:
Among them, θ is the angle between the sound beam and the direction of liquid flow
M is the number of straight line propagation times of the sound beam in the liquid
D is the inner diameter of the pipeline
Tup is the propagation time of the sound beam in the positive direction
Tdown is the propagation time of the sound beam in the opposite direction Δ T=Tup – Tdown
1. High precision measurement, linearity better than 0.5%, repeatability accuracy better than 0.2%, measurement accuracy better than ± 1%
2. The probe has low power consumption, easy installation, and easy positioning, and is widely used in related fields such as rivers, water supply, factories, and urban sewage pipelines.
3. The measurement range is large, and different types of sensors can be used to measure the flow rate of pipelines with diameters ranging from DN15 to DN6000mm.
4. Supports Chinese or English menus. Different versions of flow meters can support Chinese or English menus for convenience and speed.
5. Strong reliability, using low voltage and multi pulse transmission circuits to significantly improve measurement accuracy, service life, and reliability.
6. Strong anti-interference ability, using dual balanced signal differential transmission and receiving circuit, effectively resisting strong interference sources such as frequency converters, TV towers, and high-voltage lines.
7. Powerful memory ability, automatically remembers the cumulative flow of the first 64 days, the first 64 months, and the first 5 years, automatically remembers the time and flow of the first 64 incoming and power outages, and automatically remembers whether the flowmeter's working status is normal for the first 64 days.
8. Built in remote communication module, capable of producing various communication protocols. (METER-BUS protocol, MODBUS protocol, Fuji extension protocol, simplified water meter protocol)
9. RS232/RS485 output, 4-20mA pulse output.
1. Basic parameters
Project | Performance parameter |
Accuracy | ±1% |
Flow velocity range | 0-±32m/s，Forward and backward measurement |
Pipeline diameter | DN15-DN6000 |
Fluid type | Water, seawater, sewage, acidic and alkaline liquids, alcohol, beer, various oils, and other single and uniform liquids that can transmit ultrasonic waves |
Pipeline material | Steel, stainless steel, cast iron, copper, PVC, aluminum, fiberglass, and all other high-quality and dense pipelines |
signal output | 1 channel 4-20mA current output, impedance 0-1K, accuracy 0.1% 1-channel OTC pulse output, pulse width 6-1000ms 1 relay output |
Signal input | 3-channel 4-20mA current input, can be used as a data collector Connect the three wire PT100 platinum resistor to achieve heat measurement |
Communication Interface | Isolated RS-485 serial interface, supporting MODBUS protocol |
Power supply mode | DC8-36V or AC85-264V |
2. Working environment
Host | Sensor | |
Protection level | - | - |
Humidity | ≤80%RH | |
Temperature | -20-60℃ | -40-160℃ |
