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Đo lưu lượng,LDG intelligent electromagnetic flowmeter water

Đo lưu lượng,LDG intelligent electromagnetic flowmeter water

  • Đăng ngày 11-01-2019 02:20:16 AM - 173 Lượt xem
  • Mã sản phẩm: LDG

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    ntelligent electromagnetic flowmeter 
    The intelligent electromagnetic flowmeter consists of two parts: a sensor and a converter. It is based on Faraday's law of electromagnetic induction and is used to measure the volumetric flow of conductive liquid with conductivity greater than 5μS/cm . It is an inductive instrument for measuring the volumetric flow of conductive media. In addition to measuring the volumetric flow rate of general conductive liquids, it can also be used to measure the volumetric flow rate of strong corrosive liquids such as strong acid and alkali, and uniform liquid-solid two-phase suspension liquids such as mud, slurry and pulp.
    Widely used in petroleum, chemical, metallurgy, textile, paper, environmental protection, food and other industrial sectors and municipal management, water conservancy construction, river dredging and other fields of flow measurement.
    One. Features:
    1.  Full digital processing, strong anti-interference ability, reliable measurement, high precision, flow measurement range up to 150 1
    2.  Ultra-low EMI switching power supply, suitable for wide range of power supply voltage and goodanti- EMI performance.
    3. The  use of 16 -bit embedded microprocessor, computing speed ,  high precision, low-frequency square wave excitation frequency is programmable, improve the stability of the measured flow rate and low power consumption.
    4. The  use of SMD components and surface mount (SMT) technology, circuit reliability.
    5.  There are no moving parts in the pipe, no flow blocking parts, and there is almost no additional pressure loss in the measurement.
    6.  On-site can modify the range online according to the actual needs of the user.
    7.  Measurement results are independent of physical parameters such as flow velocity distribution, fluid pressure, temperature, density, and viscosity.
    8.  High-definition backlit LCD display, full Chinese menu operation, easy to use, easy to operate, easy to learn and understand.
    9.  With digital communication signal output such as RS485 RS232 Hart and Modbus optional )
    10.  With self-test and self-decision function.
    11.  Total hourly recording function, recording the total amount of flow in hours, suitable for time-sharing measurement optional )
    12. There  are three internalizers to display the forward cumulative amount reverse cumulative amount and the difference integrated amount respectively. The internal set is not powered down, and 16 times of power down time can be recorded optional )
    13.  Infrared handheld operator, 115KHZ communication rate, long-distance non-contact operation converter all functions optional )
    Two Technical parameters:
     
    Nominal diameter (mm)
    (Special specifications can be customized)
    Pipeline PTFE lining: DN10 DN600
    Pipeline rubber lining: DN40 DN1200
    Flow direction: Positive, negative, net flow
    Range ratio: 150 1
    Repeatability error: ±0.1% of the measured value
    Accuracy level: Pipeline: 0.5 grade 1.0 stage
    Measured medium temperature: Ordinary rubber lining: - 20 +60 °C
    High temperature rubber lining: - 20 to +90 °C
    PTFE lining: - 30 +100 °C
    High temperature PTFE lining: - 20 to +180 °C
    Fixed work stress:
    (High pressure can be customized)
    DN6 DN80 ≤1.6MPa
    DN100 DN250 ≤ 1.0MPa
    DN300 DN1200 ≤0.6MPa
    Flow rate range: 0.1 15m/s
    Conductivity range: The conductivity of the measured fluid is ≥5μs/cm
    Current output: Load Resistance to 10 mA 0to 1.5 kΩ
    to 200mA to 750 kΩ
    Digital output frequency: The upper limit may be . 1 5000HZ between
    Digital output mode: Set transistor open-circuit bidirectional output with photoelectric isolation in the output frequency
    Collector maximum current: When the external power supply is ≤35V , the maximum current of the collector is 250mA.
    Power supply: AC220V or DC24V
    Required straight pipe length Upstream ≥5DN , downstream ≥2DN
    Connection method: Flange connection between flowmeter and piping
    Connection size: Flange dimensions shall comply with the GB11988 provisions
    Explosion-proof grade: mdIIBT4
    Protection level: IP65 , special order up to IP68
    Ambient temperature: 25 to +60 °C
    Relative temperature: 5% to 95%
    Total power consumption: Less than 20W
     
    Signal output 4-20mA ( load 0-750Ω) , pulse frequency, control level
    Power supply AC220V , tolerance 15% ; or DC24V , ripple ≤5%
    Communication output RS 485 MODBUS protocol, HART protocol, Profibus-DP protocol
    Range selection:
    Inner diameter (mm) 10 15 20 25 32 40 50 65
    Qmin(m3/h) 0.0283 0.0636 0.12 0.176 0.29 0.452 0.7 1.19
    Qmax(m3/h) 4.24 9.54 16.96 26.5 43.42 67.85 106.0 179.0
    Inner diameter (mm) 80 100 125 150 200 250 300 350
    Qmin(m3/h) 1.8 2.82 4.41 6.36 11.3 17.6 25.4 34.6
    Qmax(m3/h) 271.0 424.0 662.0 954.0 1690 2650 3810 5190
    Inner diameter (mm) 400 450 500 550 600 700 800 900
    Qmin(m3/h) 45.2 57.2 77.6 85.5 101.0 138.0 180.0 229.0
    Qmax(m3/h) 6780 8570 10600 12800 15200 20700 27100 34300
    Inner diameter (mm) 1000 1100 1200 1400 1600 1800 2000 2200
    Qmin(m3/h) 282.0 342.0 407.0 554.1 732.7 916.0 1131.0 1368.4
    Qmax(m3/h) 42400 51300 61000 83121 108566 137404 169635 205258
    three. Electrode selection:
    The material of the electrode should be selected according to the corrosiveness of the fluid to be tested. Please check the relevant manual for corrosive tests on special fluids.
    material Code Corrosion resistance
    316L stainless steel V Suitable for industrial, domestic water, raw water well water, urban sewage and other neutral solutions
    weakly corrosive acid, alkali, salt medium such as carbonic acid, acetic acid, etc.
    Hastelloy C HC Suitable for oxidation resistant acids such as nitric acid, mixed acid, a mixture of chromic acid and sulfuric acid
    corrosion resistance of oxidation-resistant salts or other oxidant environments such as Fe Cu
    Excellent corrosion resistance to seawater, alkaline solution and oxide solution
    not applicable: hydrochloric acid
    Hastelloy B HB good corrosive to non-oxidizing acids, alkalis, salts such as sulfuric acid, phosphoric acid, hydrofluoric acid
    not applicable: nitric acid
    titanium Ti Resistant to seawater, various chlorides, hypochlorite and various hydroxides
    Ta In addition to hydrofluoric acid, it is almost resistant to corrosion by all chemical media. But expensive
    platinum Pt Suitable for all acid and alkali salt solutions (fuming sulfuric acid and nitric acid)
    Tungsten carbide W Excellent wear resistance, designed for abrasive media such as mud and pulp
    four. Selection of lining materials:
    The lining material should be selected according to the corrosive wear and temperature of the tested medium.
    Lining material Corrosion resistance Operating temperature Scope of application
    Neoprene Ne Resistant to general low concentration acid and alkali corrosion -20 to 70 °C Industrial water sewage low concentration acid-base salt
    Polyurethane rubber PO Excellent wear resistance, specially designed for strong abrasive slurry, not resistant to corrosion -10 to 60 °C Liquid containing solid particles (cement slurry, etc.)
    Polyfluoroethylene propylene FEP heat and corrosion resistance is equivalent to PTFE
    high mechanical strength, good wear resistance
    3 The inner surface is smooth and it is not easy to adhere to sediment
    has good negative pressure resistance, anti-vacuum effect
    -40 to 180 °C All fluids except strong abrasive media such as mortar. LikePTFE , it can be used for hygienic media such as beverages.
    PTFE PTFE Almost resistant to corrosion from all chemical media, poor wear resistance -40 to 180 °C Cannot be used in negative pressure piping and highly abrasive fluids
    Electromagnetic flowmeter integrated and split type selection
    Integrated electromagnetic flowmeter: the sensor and converter are integrated.
    Split type electromagnetic flowmeter: The split type electromagnetic flowmeter consists of a sensor and a converter. The sensor is installed on the measuring pipe. The converter is installed within 30 meters or within 100 meters of the sensor , and the two are connected by a shielded cable.
    Under the conditions of better on-site environment, an integrated electromagnetic flowmeter is generally used.
    The split electromagnetic flowmeter is generally selected in the following cases:
    1. Ambient temperature or flowmeter converter surface is exposed to radiation temperatures greater than60 °C .
    2. Where the pipe vibration is large.
    3. Where the aluminum shell of the converter is severely corrosive.
    4. Where the site has high humidity or corrosive gas.
    5. The flowmeter is installed in an occasion where it is inconvenient to debug at high altitude or underground.
    (The split electromagnetic flowmeter should indicate the cable connection distance between the sensor and the converter when ordering, generally no more than 20M , and the converter is wall mounted. )
         

     



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