measuring principle

Online time difference method ultrasonic open channel flowmeter, using ultrasonic time difference method to measure water flow velocity. Widely applicable for measuring flow velocity and volume in pipelines, rivers, and channels. Install ultrasonic time difference flowmeter sensors on both sides of the channel to measure the average flow velocity in the water. Then, measure the water level through an ultrasonic water level gauge and calibrate the hydraulic model to calculate the instantaneous flow rate of the open channel using a flow integrator.

Main performance characteristics

*High precision measurement circuit with a resolution of 20ps;

*Ultra strong sensor transmission power, penetrating 15mm carbon steel plate;

*US specific low-noise preamplifier, 0.8nv/Hz;

*The dedicated 500K ultrasonic transducer can measure a maximum sound path of 100 meters;

*The dedicated 200K ultrasonic transducer can measure a maximum sound path of 200 meters;

*Suitable for measuring flow velocity and flow rate at a 45 degree angle across various rivers and channels;

*The transducer can be installed with water;

*Each independent intelligent measurement module ensures fast, accurate, and stable multi-channel measurement;

*The host is equipped with multiple interfaces that can be connected to various RTUs or liquid level meters and other devices;

*Measure the water flow rate of ladder type, rectangle, circular pipe, culvert, and irregular cross-section;

*Isolate RS485 serial port and pulse output;

*Resistance to power frequency and frequency conversion interference;

*Optional power lightning protection and signal lightning protection;

Key component performance indicators

(1) Ultrasonic flow velocity sensor

*Measurement principle: Time difference method for continuous measurement

*Measurement channel: 1 channel to 8 channels are optional

*Adaptability: capable of measuring wastewater containing solid substances

*Measurement flow accuracy: 5.0%

*Flow velocity range: 0.01m/s -30m/s

*Measure channel width: Time difference method 0.5-10 meters

*Environmental temperature: -20-70 ℃

*Working temperature: -20-70 ℃

*Medium temperature: -20-80 ℃

*Protection level: IP68

(2) Ultrasonic liquid level sensor

*Measurement accuracy: 1.0%

*Measurement range: 0.01m-10m

*Resolution: 1.0mm

*Environmental temperature: -20-70 ℃

*Working temperature: -20-70 ℃

*Medium temperature: -20-80 ℃

*Protection level: IP68

(3) Host

*Data display: 19264 LCD screen display, keyboard input

*Power supply voltage: AC220V ± 20% or DC12-28V

*Whole machine power consumption:<20W

*Display content: flow rate, cumulative flow rate, flow rate, liquid level, signal, etc

*Output signal: 4-20mA, pulse RS232/485

*Environmental temperature: -20-70 ℃

*Working temperature: -20-70 ℃

*Relative humidity: 10-90%

*Protection level: IP65

*Installation method: Wall mounted

*Distance between host and sensor: ≤ 200 meters

Installation (selection of installation points, cross-sectional measurement, sensor installation, comprehensive wiring, debugging)

Schematic diagram of 2-channel measurement

Sectional mapping