GPRS Doppler Open Channel Flowmeter

 GPRS ultrasonic Doppler flowmeter

GPRS non-full pipe flowmeter

GPRS River Flowmeter

1. System composition and principle

This system is mainly composed of three parts: the main station of the user management center, the communication network, and the on-site monitoring equipment. It is realized by the front-end metering equipment, the data remote communication equipment and the system software. Through simple and economical monitoring and measurement methods, the purpose of remote real-time monitoring is realized, and then good social and economic benefits are realized.

The network topology is as follows: 

 2. Product introduction

2.1 Product introduction

This product is a sensor that measures the velocity and flow of water in natural waters, channels, or pipelines.

The flowmeter is divided into two parts: the sensor and the GPRS host, which are connected by a cable.

It can measure the speed and flow of water in channels and rivers, and the water level is more than 20 cm higher than the sensor.

It can measure the flow rate and flow of water in pipes and culverts. The water level must be more than 20 cm higher than the sensor, and the inner diameter of the pipe must be ≥ 500 mm.

2.2 Working principle

The sensor has two transducers, one for transmitting and one for receiving. When the sensor is facing the direction of water flow, that is, under the premise of countercurrent measurement:

1. When the water flow is still, the received frequency is the same as the transmitted frequency.

2. The faster the flow rate, the faster the frequency received by the receiving sensor, which will be higher than the transmitting frequency.

3. The slower the flow rate, the slower the frequency received by the receiving sensor, but it will be higher than the transmitting frequency.

When the sensor measures along the direction of the water flow:

1. When the water flow is still, the received frequency is the same as the transmitted frequency.

2. The faster the flow rate, the faster the frequency received by the receiving sensor, but it will be lower than the transmitted frequency.

3. The slower the flow rate, the slower the frequency received by the receiving sensor, but it will be lower than the transmitting frequency.

From the above, the water flow velocity and direction can be calculated through hardware and software.

The sensor must be directly facing the direction of the water flow during installation and use.

3. Technical parameters:

Model abbreviation: HFT-DPLMQLS-GPRS

Structure: split type;

Measurement types: velocity, flow, water depth, water temperature

Sensor protection level: IP68

Purpose: online measurement

Flow rate range: ±0.03m/s～±5m/s (customizable ±0.03m/s～±10m/s, forward and reverse bidirectional flow velocity);

Water depth range: 0.02～3m, 0.02～10m (please confirm the maximum water depth before ordering);

Flow velocity accuracy: ±1% (detection accuracy submitted by the Ministry of Water Resources);

Flow velocity accuracy: ±1～3% (measurement accuracy will change due to the influence of the on-site working environment);

Water depth accuracy: ±3cm;

Flow rate resolution: 1mm/s;

Temperature resolution: 0.1℃;

Water depth resolution: 1mm.

Flow range: 10 liters/sec～99999999 cubic meters/hour

Power supply: battery powered, 12VDC;

Output signal (battery powered): GPRS wireless;

GPRS output signal content: flow rate, instantaneous flow, cumulative flow, water level, temperature

Cable length between sensor and transmitter: 20 meters;

Types of tested waterways: pipes, channels, natural streams, rivers;

Liquid pH requirements: PH value is between 6 and 8, non-corrosive to the sensor.

Liquid temperature requirement: 0～60℃ (non-icing state);

Liquid pressure requirement: 1 standard atmospheric pressure in natural environment

The power supply for the flowmeter is 11～14VDC, and the power supply current is 250mA.

Continuous working power consumption: 14V×250ma=14V×0.25A=3.50W.

GPRS wireless host: 2G/3G/4G/Ethernet/NB-IOT/LoRa and other communication functions are integrated to realize the collection, storage, display, accumulation, alarm and other data of hydrology/water resources/environmental protection 212/TCP Modbus/MQTT Comprehensive functions such as transmission

Supporting software: (optional)

Data acquisition system 1 set of low-power GPRS wireless data acquisition and transmission software

Configuration management system 1 set of low-power GPRS wireless data acquisition server software

3.1 Standard measurement status

After the sensor is powered on, the flow rate and flow rate will be output after 60 seconds, and then a data will be output every 3-5 seconds.

In the standard measurement state, the sensor directly outputs a 485 signal to connect with the host, and the host outputs two kinds of data: flow rate and flow rate through the 485 interface.

3.2 Wireless host display interface

Display interface: water level, instantaneous flow, total flow, water temperature

3.3 Cross-sectional area of wireless host channel type selection

There are three channel types for cross-sectional area (circular rectangle, trapezoid), select the corresponding channel, enter the corresponding parameters, set with one key, read with one key, restart the device at the terminal parameter, read with the last key, and confirm whether to write enter.

Applications:

Used for urban waterlogging, sewage water quality monitoring, urban pipeline monitoring, rainfall station monitoring and pressure point monitoring in the construction of smart city projects; suitable for rainfall point monitoring of existing water conservancy projects, river water and rain monitoring, reservoir water and rain monitoring , Flow stations, irrigation areas, open channel monitoring, etc.; suitable for automatic monitoring of water plants in smart water projects, online water quality monitoring, water supply network monitoring, monitoring of large water users, secondary water supply monitoring, etc.; suitable for collapse and landslides of geological disaster projects Point monitoring, debris flow monitoring, deep surface displacement monitoring, soil moisture content monitoring, geoacoustic monitoring, automatic pore water seepage pressure monitoring, rainfall, surface water level detection and other industries, scientific and reasonable management system and sound quality control system, to achieve product availability The traceability management helps the safe and efficient operation of products. It has won the trust of representative users in the industry such as China National Chemical Corporation, Harbin Institute of Technology, Baosteel Group, China State Construction Group, COFCO Group, Hengan Group, etc., and has accumulated a wealth of instrument products in various fields. On-site disposal experience.

Field case: