One. Introduction Definition XT830 ultrasonic flowmeter is the fluid flowing through the detection of the ultrasound beam (or ultrasonic pulse) to measure the flow rate of the instrument. Principle based on the principle of ultrasonic flowmeter signal detection can be divided into the propagation velocity difference method (direct difference method, difference method, the phase difference method and frequency difference method), the beam offset method, Doppler method, correlation method, spatial filter France and noise method. Ultrasonic flowmeter and ultrasonic flowmeter, as a result of the flow meter channel not set any obstacle pieces are unimpeded flow meter is suitable for flow measurement difficult problems to solve a class of meter, especially in large-diameter flow measurements have a more prominent The advantage, it is one of the rapid development of a class of flowmeter. Ultrasonic flowmeter uses the time difference measuring principle: After launching a probe signal through walls, media, and the other side of the wall, another probe is received, while the second probe is also transmitted signal is received by the first probe , due to the impact velocity of the medium, the two time difference Δt, can be drawn according to the estimated flow rate conversion between V and the time difference Δt between V = (C2 / 2L) × Δt, then you can get the flow value Q II. Advantages and disadvantages of the advantages of ultrasonic flowmeter is a non-contact instrument, it can measure the flow medium can also be used to measure the diameter of the contact and observation difficult medium. Its high measurement accuracy, almost without interference from the various parameters measured media, in particular, can not solve the flow measuring instruments other strong corrosive, non-conductive, radioactive and explosive media issues. Disadvantages shortcomings now primarily fluid temperature range can be measured by the ultrasonic transducer aluminum coupling material and temperature and degree of restriction between the transducer and the pipe, and the raw data at a high temperature fluid to be measured sound propagation velocity insufficiency. At present, China only fluid below 200 ℃ for measurement. In addition, the measurement line ultrasonic flowmeter complicated than the average meter. This is because, in general industrial metering the flow rate of the liquid is often a few meters per second, while the speed of sound in the liquid is approximately 1500m / s or so, the measured fluid flow rate (flow rate) to bring the amount of change in the maximum change in the speed of sound is 10- three orders of magnitude. If required to measure the flow rate accuracy of 1%, the speed of sound measurement accuracy needed to 10-5 ~ 10-6 magnitude, so there must be complete measurement circuit can be achieved, which is the only integrated ultrasonic flowmeter Under the premise of rapid technological development in order to get practical reasons. Ultrasonic flowmeter ultrasonic transducers, electronic circuits and flow display and accumulation system consists of three parts. Ultrasonic transmitting transducer converts electrical energy into ultrasonic energy, and transmitted to the fluid to be measured, the receiver receives the ultrasonic signal, the electronic circuit is amplified and converted into an electrical signal representative of the flow rate supplied to a display instrument for display and totalizer and totalizer. This realization of the traffic detection and display. Ultrasonic flowmeter common piezoelectric transducer. It uses a piezoelectric effect of the piezoelectric material, the use of a suitable transmission circuit transmitting the electrical energy applied to the piezoelectric transducer element, to produce an ultrasonic vibration advised. Ultrasonic fluid incident at an angle spread, and then received by the receiving transducer, and by the piezoelectric elements into electrical energy, in order to detect. Transmitting transducer using a piezoelectric element of the inverse piezoelectric effect, and the receiver transducer is the use of the piezoelectric effect. Ultrasonic flowmeter transducer element normally made of round piezoelectric sheet in the thickness vibration. Diameter of more than 10 times the sheet thickness to ensure directional vibration. Piezoelectric element material to use lead zirconate titanate. For fixing a piezoelectric element, the ultrasonic incident at right angles to the fluid, the required sound enemy wedge element constituting the transducer as a whole (also known as probe). Sound wedge material requires not only high strength, anti-aging, and requires energy losses after a small wedge of ultrasonic sound that is transmitted by close to a factor. Common sound wedge material plexiglass, transparent because it can be observed that the assembly of the acoustic wedge piezoelectric element. In addition, some rubber, plastic and bakelite material also can be used for sound wedge. Three. Features Features ◆ unique digital signal processing technology, the instrument measuring the signal more stable, anti-jamming capability, more accurate measurement. ◆ no mechanical transmission parts are not easy to damage, maintenance-free, long life. ◆ more optimized circuit, high integration, low power consumption and high reliability. ◆ Intelligent standard signal output, friendly interface, a variety of secondary signal output for you to choose. ◆ small diameter pipe segment economical and convenient measurement, high accuracy. Handheld Ultrasonic Flowmeter F601 / G601 technical parameters are as follows: Measuring principle: the principle of velocity difference related: 0.01 ~ 25 m / s Resolution: 0.025 cm / s Repeatability: 0.15% reading: Depending on the application and the full development of the flow field radially symmetric volume flow: ± 1% of reading, depending on the application ± 0.5% of reading, calibrated flow rate: ± 0.5% of reading, depending on the application can be measured media: All guides sound fluid and volume content of bubbles or solid particles 14h Display: 2 x 16 characters, dot matrix, with backlight Operating temperature: -10 ~ 60 ℃ Power consumption: 100 000 measure the amount of communication interfaces: RS232, RS485 (optional) communication parameters: the measured value, the record value of the parameter Recording Software: FluxData (optional) Non-contact measurement do not obstruct the flow measurement, no pressure loss can measure non-conductive liquid range than wide, versatile host a variety of functions, easy to carry features download measurement / recording, graphical display format conversion OS: WindowsTM; process output (optional) output from the master device is electrically isolated from the output set of numbers depending on the type of output more information, please contact FLEXIM current range:. (0 / 4-20) mA accuracy: 0.1% reading ± 15μA Active Output: Rext <500 ?? passive output: Uext <24V, Rext <1k ?? voltage range: (0 ~ 1) V or (0 ~ 10) V Accuracy: 0 ~ 1V: 0.1% of reading ± 1mV0 ~ 10V: 0.1% of reading ± 10mV meter impedance: Ri = 500 ?? Frequency range: 0 ~ 1kHz or 0 ~ 10kHz open collector: 24 V / 4mA switch open collector: 24 V / 4mA Reed Relay: 48 V / 0.1A features such as status outputs: upper and lower limits, sign change or error pulse output: Value: (0.01 ~ 1000) units Width: (80 ~ 1000) ms process input (Optional) Enter the master device is electrically isolated, Up to four sets of input temperature type:. Pt100, four-wire range: -50 ℃ ~ 400 ℃ Resolution: 0.1 K Accuracy: ± (0.02K + 0.1% of reading) Current Range: Active: (0 ~ 20) mA No Source: (-20 ~ 20) mA Accuracy: 0.1% of reading ± 10 A active input: Ri = 50 ?? passive input: Uext <24V, Rext <1k ?? voltage range: (0 ~ 1) V or ( 0 ~ 10) V Accuracy: 0 ~ 1V: 0.1% of reading ± 1mV0 ~ 10V: 0.1% of reading ± 10mV meter impedance: Ri = 1M clamp-on probes suitable diameter: DN6-DN6500 Temperature: -30 to 400 ℃ (Applicable Explosion-proof area) See chart for more information, please refer to the relevant manual thickness measuring probe (optional) Measuring range:. (1.0 - 200) mm Resolution: 0.01 mm Linearity: 0.1 mm Standard: -20 ℃ to + 60 ℃ high temperature: 0 ℃ to + 200 ℃ short time up to + 540 ℃ four application areas. Application Overview propagation time method is applied to clean, single-phase liquids and gases. Typical applications include industrial emissions solution: strange liquid, liquefied natural gas; gas applications in the field of high-pressure natural gas has been used a good experience; environmental Doppler method is suitable for different phases of the biphasic fluid content is not too high, for example: No sewage treatment plant discharge fluid, dirty fluid flow; generally not suitable for very clean liquids.