The clamp-on or pipe-segment ultrasonic flow meter is based on the principle of "speed difference method" to measure the flow of liquid in a round tube. It uses advanced multi-pulse technology, signal digital processing technology and error correction technology to make the flow meter more adaptable to the environment of the industrial site, and the measurement is more convenient, economical and accurate. The products have reached the advanced level at home and abroad, and can be widely used in petroleum, chemical, metallurgy, electric power, water supply and drainage fields.
According to the principle of signal detection, ultrasonic flowmeters can be divided into propagation velocity difference method (direct time difference method, time difference method, phase difference method and frequency difference method), beam shift method, Doppler method, cross correlation method, and spatial filtering method And noise law, etc.
Ultrasonic flowmeters are the same as electromagnetic flowmeters. Because there are no obstructions in the flow channel of the instrument, they are non-obstructive flowmeters. They are a type of flowmeter suitable for solving difficult flow measurement problems, especially in large-diameter flow measurement It is one of the rapidly developing types of flow meters.
◆Unique signal digital processing technology makes the measurement signal of the instrument more stable, strong anti-interference ability and more accurate measurement.
◆Without mechanical transmission parts, it is not easy to be damaged, maintenance-free and long life.
◆ More optimized circuit, high integration; low power consumption and high reliability.
◆Intelligent standard signal output, friendly man-machine interface, multiple secondary signal output for your choice.
◆Pipe-section type small pipe diameter measurement is economical and convenient, and the measurement accuracy is high.
Piezoelectric transducers are commonly used in ultrasonic flowmeters. It uses the piezoelectric effect of piezoelectric materials, and uses a suitable transmitting circuit to add electrical energy to the piezoelectric element of the transmitting transducer to generate ultrasonic vibration. Ultrasonic waves are injected into the fluid at a certain angle to propagate, and then are received by the receiving transducer, and converted into electrical energy by piezoelectric elements for detection. The transmitting transducer uses the inverse piezoelectric effect of the piezoelectric element, while the receiving transducer uses the piezoelectric effect.
The technical parameters of the external clamp type ultrasonic flowmeter AFTU-2W are as follows:
Installation method: wall-mounted
Velocity range: 0~5m/s
Accuracy: ±1% of measured value
Keyboard: 16 (4×4) touch keys
Display: 20×2 dot matrix character backlit LCD display
Power supply: 10~36VDC/1Amax
Shell material: PC/ABS plastic
Protection level: IP65
Ambient temperature: -10℃~+50℃
Output: frequency output 0-5kHz, OCT mode: 4-20mA output
Communication: RS-485 communication interface, support Modbus protocol
Handheld/portable ultrasonic flowmeter
More than 30 kinds of pure liquids such as purified water and tap water
Measuring pipe diameter
1% of indicated value, flow velocity> 0.2m/s
Host -30°C~90°C Flow sensor -30°C~160°C
Host: 85% sensorProtection level: IP67
90~230VAC (can work continuously for 12 hours after sufficient)
Flame retardant ABS
1 way OCT pulse output (pulse 6~1000ms, default 200ms)
RS232C, baud rate
Wall-mounted ultrasonic flowmeter
Wall-mounted ultrasonic flowmeter
Tap water, alcohol, sea water and other relatively pure liquids