The buoy level transmitter operates on the principle of buoyancy, and its measurement principle is shown in the figure. When the liquid level is at the zero level, the torsion tube is subjected to the torque generated by the weight of the buoy (at this time, the torque is maximum), and the torsion tube's rotation angle is at "zero" degrees. As the liquid level gradually rises to the maximum, the torsion tube is acted upon by the torque generated by the maximum buoyancy (at this time, the torque is minimum) and rotates by an angle φ. The transmitter converts this rotation angle φ into a 4~20mA DC signal, which is proportional to the measured liquid level.
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1- Stop Valve 2- Buoy Body with Blowdown Valve 3- Transmitter
4- Torsion Tube Assembly 5- Buoy 6- Blowdown Valve 7- Plug
The torsion tube is a tube made of elastic alloy. As shown in the figure, a mandrel is welded in the middle of one end (called the free end), and the other end is fixed to the instrument housing. During operation, when the buoy's buoyancy changes due to liquid level variation, this buoyancy causes the free end of the torsion tube to rotate through a lever. The mandrel then rotates accordingly and transmits the rotation in the form of an angle.
Therefore, the function of the torsion tube in the buoy level transmitter is to convert the linear displacement measured by the buoy into the angular displacement of the torsion tube mandrel, and to isolate the high-pressure part inside the measured vessel from the low-pressure external environment.
The buoy level transmitter consists of a measuring part and a conversion part (amplifier).
- Measuring Part: Composed of a buoy and suspension chain, transmission rod, torsion tube, and housing.
- Conversion Part: Composed of the amplifier's microprocessor, electronic circuit, and LCD/operation keys.
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- High measurement accuracy
- Low drift
- Strong anti-interference capability
- Automatic compensation for temperature and density during measurement
- Adjustable measuring range
- Measuring Range: 300, 500, 800, 1200, 1600, 2000mm
- Accuracy: Electric Transmitter - Class 0.5, Class 1, Class 1.5
- Power Supply: 24VDC ±5%
- Output Signal: 4~20mA DC
- Density Range:
- For liquid level measurement: 0.5~1.5g/cm³
- For interface level measurement: 0.05~0.5g/cm³
- Operating Temperature: 150℃, 350℃
- Operating Pressure: 4.0MPa, 6.4MPa, 16MPa, 32MPa
- Suitable for high-temperature, low-temperature, high-pressure, vacuum, and negative-pressure environments.
- High measurement accuracy, suitable for occasions with small liquid level variation ranges.
- Not suitable for measuring high-viscosity media or media with slow reaction rates.
According to the installation position of the buoy on the equipment, it is divided into internal buoy (installed inside the equipment) and external buoy (installed outside the equipment).
- Installation types: Side mounting and top mounting.
- Connection: Flange connection, with the class determined by the design pressure of the equipment.
- All installed on the side wall of the equipment with flange connection. Usually, two flanges (upper and lower) are set on the same vertical line of the outer wall.
- Installation types based on the orientation of the buoy body flange:
- Side-Side Flange Mounting
- Top-Side Flange Mounting
- Bottom-Side Flange Mounting
- Top-Bottom Flange Mounting
- Avoid excessive impact and vibration during transportation and unpacking.
- The installation should be firm and reliable, and the buoy should be installed vertically to prevent collision between the buoy and the inner wall of the buoy chamber.
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