Portable Doppler Flowmeter

Product Brochure

Model AN-PDF11 portable Doppler flowmeter is matched with dedicated Doppler flow sensor. Pre-stored with channel section models including trapezoid, rectangular and circular shapes to conveniently calculate flow rate of common open channels. It adopts built-in temperature sensor for water temperature measurement and pressure sensor for water depth detection.

The host unit is equipped with full touch screen for easy operation and powered by a 12V rechargeable battery.

Doppler Flow Measurement Principle：When relative movement exists between ultrasonic transmitter and receiver, the received ultrasonic frequency differs from the transmitted frequency. Waterborne suspended particles and tiny bubbles moving with water flow cause frequency shift of received ultrasonic signals; the frequency shift value rises along with the moving speed of suspended substances. The measured Doppler frequency shift is converted into flow velocity of water. Multiply flow velocity by channel cross-sectional area to acquire flow volume.

Since sound velocity in water varies greatly with water temperature, a built-in temperature sensor measures water temperature to revise acoustic velocity for accurate velocity calculation. Water level is measured via diffused silicon pressure sensor to detect vertical distance from the velocity probe to water surface.

n Integrated structure with multiple built-in sensors to simultaneously measure flow velocity, water level and water temperature.

n Direct on-screen readout of flow velocity, water depth, instantaneous flow and cumulative flow.

n Doppler-based velocity measurement adapts to low flow velocity and shallow water level working conditions.

n No rotating mechanical rotor, causing no disturbance to flow field and flow pattern.

n Supports instantaneous flow and total cumulative flow measurement.

n User-friendly setup and rapid field deployment.

Flow Sensor Part：

Measured Parameters: Flow velocity, water level, water temperature, instantaneous flow rate, cumulative flow

Measurement Mode: Continuous in-situ monitoring

Measurement Principle: Velocity by acoustic Doppler method; Water level by hydrostatic pressure method; Flow by velocity-area method

Forward flow velocity: Range 0.021~6.00 m/s, Resolution 0.001 m/s, Accuracy ≤±1.0%±1 cm/s

Reverse flow velocity (Optional): Range -6.000~-0.021 m/s, Resolution 0.001 m/s, Accuracy ≤±1.0%±1 cm/s

Water level: Range 0.03~10 m (customizable), Resolution 0.001 m, Accuracy ±0.25%FS, Repeatability ≤±0.2 cm, Hysteresis <±0.1 cm

Water temperature: Range -10℃~80℃, Resolution 0.1℃, Accuracy ±0.5℃

Ultrasonic emission frequency: 2 MHz

Instantaneous flow range: 0~9999 m³/s

Cumulative flow range: 0~999,999,999 m³

Operating voltage: DC 6.8V~24V

Average current @ DC12V: ≤45mA under working mode; ≤6mA under sleep mode

Response time: 1 s; Stabilization time:7 s

Available working water depth: 0~10 m

Data refresh period: adjustable from 6 s to 60 s

Probe emission angle:5°

Spectrum output: Supports spectrum data transmission with up to 512 sampling points

Configurable velocity compensation & pressure compensation available

Output signal: Modbus RS485

Ingress protection: IP68; Anti-corrosion grade: Grade 10

ESD immunity: Level 3; Surge immunity: Level4

Housing material: ABS high molecular composite

Standard cable: 10m gas-guided anti-corrosion cable (custom length available)

Ambient pressure requirement: Standard atmospheric pressure

MTBF >25000 hours

Dimension:173×50×29 mm; Storage temp: -40℃~80℃; Operating temp:-10℃~60℃

Weight:0.8KG (including 10m cable)

Host Terminal Part：

Power supply: External DC12V or built-in 12V/3000mAh lithium battery

Data storage: 64M-bit onboard memory for over 70,000 records, data retention >10 years; optional 256M/512M memory upgrade

Display: 5-inch color touchscreen, 480*854 resolution

Built-in real-time clock supporting local & remote time calibration

Functions: Real-time data display; historical data query with table/curve output; specified-period data export

Optional 3-channel RS485 sensor ports; 1×12.6V charging port;1×debug RS485 port

Wireless transmission: Optional NB-IoT or 4G module

Expandable external sensors: Doppler/radar flowmeters, radar/pressure/ultrasonic water level gauges, water quality sensors (pH, conductivity, DO, SS, COD, ammonia nitrogen etc.)

One physical start/stop button

Supported protocols: AN-UNION, MODBUS-RTU, SL 651-2014, HJ 212-2017

Charging: Matched original adapter

Power consumption: Average current＜150mA at full screen brightness + active 4G (external sensors excluded)

Working Modes:(1)Continuous mode: Continuous operation, upload interval 1~65535min adjustable;(2)Intermittent mode: Periodic sensor activation, upload interval5~65535min adjustable

Upgrade: Local serial port upgrade; Configuration via touchscreen/Bluetooth/serial port

Dimension:150×80×28 mm