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『Portable Doppler flowmeter』Related information(v cone flow meter|rotary gas meter|gallon meter|gear meter|metal tube rotameter|glass tube rotameter|nutating disk meter|transit time ultrasonic flow meter|wedge flow meter|pd meters|hydraulic flow meter|ultrasonic water flow meter|water flow meter|air flow meter|magnetic water flow meter|oxygen flow meter|gas flow meter|argon flow meter|air velocity meter|gasoline flow meter|fuel flow meter|ultrasonic water meter|digital water meter|nitrogen flow meter|solid flow meter|Oxygen tank flow meter|digital water flow meter|diesel fuel flow meter|steam flow meter|02 flow meter|compressed air flow meter|oil flow meter|liquid flow meter)
What is the performance of a portable ultrasonic flowmeter?
ZRN-100P portable ultrasonic flowmeter is suitable for online calibration and inspection measurement of liquid flow rate in various industrial sites. It has the advantages of high measurement accuracy, good consistency, long battery power supply time, easy operation, and built-in integrated printer. This product has been widely used in industries such as petrochemical insulation, metallurgy, power, tap water, water conservancy, power, energy monitoring, etc., and has received unanimous praise from users. *Measurement accuracy: better than 1% * repeatability: better than 0.2% * working power supply: 220VAC (standard) or 110VAC (optional) * measurement cycle: 500ms (2 times per second, 128 sets of data collected per cycle) * battery: built-in nickel hydrogen rechargeable battery can work continuously for 24 hours * installation method: external flat installation, easy and convenient operation * display: 2-line Chinese characters display instantaneous flow, cumulative flow, signal status, etc. on the same screen * signal output: isolated RS485 * communication protocol: MODBUS protocol, compatible with similar products from other manufacturers in China * printing output: built-in thermal integrated printer, realizing timely or timed printing * other functions: self diagnosis, prompting whether the current working status is normal
2. Doppler Flow meter
3. Application principle of portable Doppler ultrasonic flow meter for river channel pipelines
The application principle of the portable Doppler ultrasonic flowmeter for river channel pipes is based on the Doppler effect, which measures flow velocity and flow rate through the interact
1. Basic principle of Doppler effect: Frequency shift phenomenon: When an ultrasonic signal (with a transmission frequency of (f_0)) encounters moving particles or bubbles in a fluid, the frequency of the reflected wave will change ((f)), and this phenomenon is called the Doppler effect. The frequency offset (Delta f=f-f_0) is proportional to the fluid flow velocity ((v)). Mathematical relationship: According to the Doppler formula, the frequency offset can be expressed as: [Delta f=frac {2v cdot f_0 cdot costheta} {c}], where: (v) is the fluid velocity; (theta) is the angle between the direction of ultrasonic propagation and the direction of fluid flow; (c) The propagation speed of ultrasonic waves in the medium (affected by temperature and compensated by a temperature sensor)
2. Signal transmission and reception during flow rate measurement: The ultrasonic transmitter of the flow meter emits a fixed frequency ultrasonic signal into the fluid, which is reflected back to the receiver when it encounters suspended particles or bubbles. Frequency difference calculation: By measuring the frequency difference (Delta f) between the transmitted signal and the echo signal, combined with the known ultrasonic frequency (f_0), propagation angle (theta), and sound velocity (c), the fluid flow velocity (v) is calculated. Flow rate correction: Built in high-precision temperature sensor monitors fluid temperature in real time, corrects changes in sound velocity (c), and ensures measurement accuracy of flow rate
3. Flow rate calculation method Velocity area method: Flow rate