Portable electromagnetic flowmeter for water quality containing sedimentMain technical indicators

²Measurement range: Flow velocity measurement0.05m/s to 10m/s (resolution 5mm/s),traffic≤10000 m³/s； Canal bottom width≤ 20m; Canal depth ≤ 20m; Slope coefficient 0-10;

²Measurement accuracy:±1.0%FS；

²Collection interval:Adjustable from 10S to 90S;

²Power supply method:3.6V/4Ah rechargeablelithium battery

²Display mode:LCD large screen LCD backlight display, full Chinese character display,The instrument can display simultaneouslyCut and section averageFlow rateinstantwater levelInstantaneous flowquantitywaitMeasurement parametersNumber;

²Physical interface:RS232 interface

²Dielectric conductivity:>20µs/cm

²Medium temperature: 0℃～60℃

²Ambient temperature-10℃～50℃

²Display digits:water level5 people,flow velocity5 people,traffic5 people

²External dimensions:127 × 114 × 80 (mm) (display device)

²Overall dimensions:Φ 32 × 460 (mm) (sensor)

²Measuring rod length: conventional1000mm x number of sections (1500mm x number of sections optional) or lifting ring accessories

Portable electromagnetic flowmeter for water quality containing sedimentfunctionfeature

At the bottomStable and reliable:measurequickSensor not availableliveMoving parts will not cause entanglementMaintain long-term continuityContinued reliable work;

At the bottomWorking hours: Designed with low power consumption, capable of continuous operation on a single charge80More than hours;

At the bottomHigh definition display:The monitor adopts high-definition backlight sourceLCDmonitor，completeChineseChinese character menu display Easy to operate、easy to useClear readings are available day and night.

At the bottomDisplay complete:The instrument can display simultaneouslyAverage cross-sectionFlow rateinstantwater levelInstantaneous flowquantitywaitMeasurement parameters.

At the bottomMulti purpose machine:The instrument can measure the flow rateceremonyUsed and can also be used for trafficceremonyUse（Placed in watercross-sectionBasic structureEnter water depthdataCan achieve traffic measurement);It can meet the flow velocity and flow measurement of open and closed channels with different cross-sections.

At the bottomData saving: can be saved at once1000Group measurement data will not be lost.

Measurement requirements

①Measurement points should be selected as much as possible in straight sections of channels or waterways, avoiding gates, bends, and water intakes/The outlet, up and down ramps, and straight channel sections should have a certain length (5-10 times the width of the channel upstream and 2-5 times the width of the channel downstream). In this way, the water flow distribution in the measurement section will be relatively stable and uniform, and the measurement data will be more stable and accurate.

② Placement of flow velocity sensor: Point the head upstream of the water flow to ensure that the flow velocity sensor is parallel to the water flow axis,Please wait for the flow rate sensor to run stably for 100 seconds before reading the measurement value, avoiding initial input of interference signals and eliminating electrode oxide film.

③Two working modes:choice0To limit the working time, choose1For continuous work mode.The method is designed for power-saving mode, which works when the flow meter starts workingAfter 1 minute, if there is no operation, the backlight of the monitor will automatically turn off, and the display mode will be the normal non backlight LCD display mode; If you want to turn on the backlight of the monitor, press any key on the keyboard to immediately turn on the backlight of the monitor. After continuous operation for 60 minutes, the flow meter will automatically turn off the working power and stop working.The continuous working mode isThe flow meter works continuously until the battery is fully charged.

working principle

Portable electromagnetic flow rate/Flow meterIt is made based on Faraday's law of electromagnetic induction.

When the conductive fluid moves along the alternating magnetic field of the flow velocity sensor perpendicular to the axis of the electrode, the conductive fluid cuts the magnetic field lines and generates an induced potential. This potential is collected by the signal electrode (two symmetrical electrodes are installed on the two side walls of the flow velocity sensor perpendicular to the parallel lines and magnetic field lines of the conductive fluid), and this induced potential is proportional to the magnitude of the flow velocity; The converter calculates the flow velocity of the conductive fluid flowing through the side of the flow velocity sensor through the induced potential. The flow velocity signal is amplified and converted into a digital signal proportional to the flow velocity signal by the flow display instrument, thereby achieving the measurement of flow velocity.

The flow display instrument adds the flow velocity signal to the already set water level data and basic channel structural parameters through the hydraulic mathematical model set in the display instrument for calculation, thereby obtaining the water flow end face