Instrument features
Full digital processing, strong anti-interference ability, reliable measurement, high accuracy, and a flow measurement range of up to 150:1;
Ultra low EMI switching power supply, suitable for a wide range of power supply voltage changes, with good EMI resistance performance;
Adopting a 16 bit embedded microprocessor, it has fast computing speed, high accuracy, and programmable low-frequency rectangular wave excitation, which improves the flow measurement
Stability and low power consumption;
Adopting SMD devices and surface mount technology, the circuit reliability is high;
There are no movable parts or flow blocking components inside the pipeline, and there is almost no additional pressure loss during measurement;
On site, the range can be modified online according to the actual needs of the user;
The measurement results are independent of physical parameters such as flow velocity distribution, fluid pressure, temperature, density, viscosity, etc;
High definition backlit LCD display, fully Chinese menu operation, easy to use, simple to operate, easy to learn and understand;
■ It has digital communication signal outputs such as RS485, RS232, Hart, and Modbus; (Optional)
■ It has self checking and self diagnostic functions;
■ Hourly total volume recording function, which records the total flow volume in hours and is suitable for time-sharing measurement system (optional);

Corrosive liquid flowmeterHow to choose the installation node correctly:
Choosing the correct installation point and installing the flow meter correctly are both very important steps. If there is a mistake in the installation process, it can affect the measurement accuracy in mild cases, the service life of the flow meter in severe cases, and even damage the flow meter.
Special attention should be paid when selecting the installation location:
The axis of the non measuring electrode must be approximately horizontal;
The measuring pipeline must be completely filled with liquid;
There should be at least 5 * D (D is the inner diameter of the flow meter) of straight pipe section in the front, and at least 3 * D (D is the inner diameter of the flow meter) of straight pipe section in the rear;
The flow direction of the fluid is consistent with the arrow direction of the flowmeter;
Vacuum inside the pipeline can damage the lining of the flowmeter, so special attention should be paid;
existCorrosive liquid flowmeterThere should be no strong electromagnetic field nearby;
existCorrosive liquid flowmeterThere should be ample space nearby for installation and maintenance;
If there is vibration in the measuring pipeline, there should be fixed supports on both sides of the flowmeter. When measuring mixed liquids of different media, the distance between the mixing point and the flowmeter should be at least 30 × D (D isCorrosive liquid flowmeterTo facilitate the cleaning and maintenance of the flowmeter in the future, a bypass pipeline should be installed for the length of the inner diameter;


Corrosive liquid flowmeterMain technical parameters
• Nominal diameter series DN (mm)
Pipeline type PTFE lining: 10 15 20 32 40 50 65 80 100 125 150 200 250 300 350 400 450 500 600.
Pipeline type rubber lining: 40 50 65 80 100 125 150 200 300 350 400 500 600 800 1000 1200.
Flow direction: positive and negative net flow. Range ratio: 150:1. Repetitive error: ± 0 of the measured value. 1%
• Accuracy level: 0.5 level, 1.0 level (pipeline type)
• Temperature of the tested medium: ordinary rubber lining:- 20 ～ +60 ℃
High temperature rubber lining:- 20 ～ +90 ℃
Polytetrafluoroethylene lining:- 30 ～ +100 ℃
High temperature PTFE lining:- 30 to+180 ℃.
• Rated working pressure: Pipeline type: DN6 ～ DN80 ≤ 1.6Mpa, DN100 ～ DN250 ≤ 1.0Mpa,
DN300 ～ DN1200 ≤ 0.6Mpa 。
• Flow measurement range: The flow measurement range corresponds to a flow velocity range of 0.1-15m/s
Traffic selection table

2、 Working principle
According to Faraday's principle of electromagnetic induction, a pair of detection electrodes are installed on the tube wall perpendicular to the axis of the measuring tube and the magnetic field lines. When the conductive liquid moves along the axis of the measuring tube, it cuts the magnetic field lines and generates an induced potential. This induced potential is detected by the two detection electrodes, and the value is proportional to the flow rate. Its value is:
E=KBVD
In the formula:
E - Induced potential;
K - coefficient related to magnetic field distribution and axial length;
B - Magnetic induction intensity;
V - average flow velocity of conductive liquid;
D - electrode spacing; (Measuring the inner diameter of the tube)
The sensor uses the induced potential E as a flow signal, which is transmitted to the converter. After amplification, transformation, filtering, and a series of digital processing, the instantaneous and cumulative flow rates are displayed on a backlit dot matrix LCD. The converter has 4-20mA output, alarm output and frequency output, and is equipped with communication interfaces such as RS-485, and supports HART and MODBUS protocols.
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4、 Main technical parameters
Nominal diameter series DN (mm)
Pipeline PTFE lining: 10, 15, 20, 32, 40, 50, 65, 80, 100, 125, 150, 200, 250, 300, 350, 400, 450, 500, 600
Pipeline rubber lining: 40, 50, 65, 80, 100, 125, 150, 200, 300, 350, 400, 500, 600, 800, 1000, 1200
Flow direction: positive and negative net flow. Range ratio: 150:1. Repeatability error: ± 0.1% of the measured value
Accuracy level: 0.5 level, 1.0 level (pipeline type)
Temperature of the tested medium: ordinary rubber lining:- 20～＋60℃
High temperature rubber lining:- 20～＋90℃
Polytetrafluoroethylene lining:- 30～＋100℃
High temperature PTFE lining:- 30 to+180 ℃.
Rated working pressure: Pipeline type: DN6～DN80≤1.6Mpa，DN100～DN250≤1.0Mpa，DN300～DN1200≤0.6Mpa.
Flow measurement range: The flow measurement range corresponds to a flow velocity range of 0.1-15m/s
Conductivity range: The conductivity of the measured fluid is ≥ 5us/cm (integrated type), and most media composed of water have a conductivity range of 200-800 μ s/cm, which can be selectedCorrosive liquid flowmeterMeasure its flow rate.
Current output: When 0-10mA, the load resistance is 0-1.5k Ω; When 4-20mA, the load resistance is 0-750k Ω
Digital frequency output: The upper limit of the output frequency can be set within 1-5000Hz with a transistor collector open circuit bidirectional output with photoelectric isolation. When the external power supply is ≤ 35V and conducting, the maximum collector current is 250mA
Power supply: 85-265V, 45-63Hz
Straight pipe length: Pipeline type: upstream ≥ 5DN, downstream ≥ 2DN
Connection method: The flowmeter and piping are connected by flanges, and the flange connection size should comply with the provisions of GB11988.
Explosion proof mark: mdIIBT4.
：
1. According to the types of unity and separationCorrosive liquid flowmeterChoose the appropriate type based on the characteristics. All-In-OneCorrosive liquid flowmeterEasy installation and wiring, moderate accuracy, not suitable for installation below ground level to prevent the converter from being submerged in water. separatedCorrosive liquid flowmeterThe accuracy is high, and the converter and sensor are installed remotely, which is more suitable for situations with poor on-site environment (such as hazardous, toxic, and easily flooded places). However, the installation and wiring are strict, otherwise interference signals may be introduced.
2. Choose the appropriate electrode form. For media that do not produce crystals, scars, or contaminate electrodes, standard electrodes can be used. Otherwise, use a type of cleaning electrode or an electrode with a cleaning connection device. For sludge testing, replaceable electrodes can also be used.
3. Select electrode materials based on the corrosiveness of the tested medium.
4. Select lining materials based on the corrosiveness, wear resistance, and temperature of the tested medium.
5Corrosive liquid flowmeterProtection level. According to the national standard GB4208-1984, which is approximately equivalent to the International Electrotechnical Commission IEC standard (IEC529-7B), the standard for the protection level of the enclosure is IP65, which is a waterproof type that allows the faucet to spray water on the instrument from any direction, with a spray pressure of 30Kpa. The water output is 0.75m3/h, and the distance between the water spray outlet and the instrument is 3m; IP67 is a waterproof type, which means that the instrument can be completely immersed in water. The point should be at least 150cm underwater for at least 30 minutes. IP68 is a submersible type that can work underwater for a long time. According to the above regulations, instruments that are prone to flooding when installed underground should be rated IP68, while instruments installed above ground should be rated IP65.
6. Select grounding based on the insulation of the connecting instrument pipeline.
7. Select based on the pressure of the tested mediumCorrosive liquid flowmeterThe nominal pressure. For flow measurements with medium pressures of 10MPa, 16MPa, 25MPa, and 32MPa, high-pressure type should be selectedCorrosive liquid flowmeter. Its maximum diameter is 100mm.
6、 Product installation:
1Corrosive liquid flowmeterIt should be installed at the lower and vertically upward positions of the horizontal pipeline, avoiding installation at points in the pipeline and vertically downward positions;

2Corrosive liquid flowmeterShould be installed at the rising point of the pipeline;
3. When installing an open discharge pipeline, it should be installed at the lower part of the pipeline;
4. If the pipeline drop exceeds 5m, install an exhaust valve downstream of the sensor;
5Corrosive liquid flowmeterControl valves and shut-off valves should be installed downstream of the sensor, rather than upstream of the sensor;
6. Sensors should never be installed at the inlet and outlet of the pump, but rather at the outlet of the pump;
7. Install in the measuring wellCorrosive liquid flowmeterThe way;