The ring is fixed to the housing together with the permanent magnet. When a ferromagnetic turbine blade passes a magnet, the magnetic resistance of the magnetic circuit changes, which generates an inductive signal. The signal is amplified and shaped by the amplifier, sent to the counter or frequency meter, and displays the total accumulated flow. At the same time, the pulse frequency is frequency-voltage converted to indicate the instantaneous flow. The speed of the impeller is proportional to the flow, and the number of revolutions of the impeller is proportional to the total flow. The output of the turbine flowmeter is a frequency-modulated signal, which not only improves the interference resistance of the detection circuit, but also simplifies the flow detection system. Its range ratio can reach 10: 1, and the accuracy is within ± 0.2%. The time constant of the small inertia and small-sized turbine flowmeter can reach 0.01 seconds.
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Features
◆ High accuracy, ± 1%, ± 0.5%, ± 0.2%.◆ Good repeatability, short-term repeatability can reach 0.05% ~ 0.2%, it is the preferred flowmeter in trade settlement.
◆ Output pulse frequency signal, suitable for the connection of total measurement and computer, no zero drift, strong anti-interference ability.
◆ Good frequency signal (3-4kHz) can be obtained with strong signal resolution.
◆ Compact and lightweight structure, convenient installation and maintenance, and large circulation capacity.
◆ It is suitable for high-voltage measurement. There is no need to make holes in the meter body, and it is easy to make high-voltage meters.
Technical parameters of diesel flowmeter
Instrument caliber: Thread connection: 4, 6, 10, 15, 20, 25, 32, 40
Flange connection: (15, 20, 25, 32, 40) 50, 65, 80, 100, 125, 150, 200
Plug-in: 200 or more
Range ratio: 1:10; 1:15; 1:20
Instrument material: 304 stainless steel, 316 (L) stainless steel, etc.
Medium temperature: -20 ℃ ～ + 120 ℃
Ambient temperature: -10 ℃ ～ + 55 ℃
Relative humidity: 5% -9%
Atmospheric pressure: 86 ～ 106Kpa
Output signal: Sensor: pulse frequency signal, low level ≤0.8V high level ≥8V
Transmitter: Two-wire 4-20mA current signal
Power supply: Sensor: + 12VDC, + 24VDC (optional)
Transmitter: + 24VDC
On-site display type: the instrument comes with a lithium battery
Explosion-proof form: Basic type non-explosion-proof, explosion-proof type
Protection level: IP65, IP67
Scope of application
Suitable for various nominal diameters, from DN15 to DN2000mm to larger;
· Suitable for high and low temperature media: from -50 ℃ ～ + 260 ℃ (special can be larger);
· Suitable for low, medium and high pressure working conditions: from 0 to 25 MPa (specially larger);
Installation specifications
Selection of measuring points
To obtain the best measurement results depends on the correct installation. First, ensure that the measuring tube medium is full. The following figure shows several common examples of correct and incorrect.Straight pipe requirements for heavy diesel flowmeter
To ensure that the fluid has a stable flow field when passing through the heavy diesel flowmeter, the straight pipeline requirements of the heavy diesel flowmeter must be ensured, otherwise measurement errors or fluctuations may be caused.
1 · 2 · 3 are the front and rear valves and bypass valves respectively; 4 is the flow meter, L ≥ 10D and L ≥ 5D are the lengths of the front and rear straight pipe sections, respectively, and D is the nominal diameter of the pipe.
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