External cone metal tube float flowmeter

Core working principle

1. Three force balance mechanism: the rotor (float) is subjected to three key forces in the fluid

• Fluid dynamic pressure: upward, increases with the increase of flow velocity

• Buoyancy: Upward, determined by fluid density

• Gravity: downwards, the weight of the rotor itself

2. Traffic location correspondence relationship

• When there is no flow: the rotor sinks to the bottom of the cone tube due to gravity

• Flow increase: The dynamic pressure increases, driving the rotor to rise

• Balance state: When the rotor rises, the annular flow area expands, the flow velocity decreases, and the dynamic pressure decreases until the three forces are balanced

• Stability indicator: The height of the rotor's stable position corresponds one-to-one with the flow rate, and the flow rate value is displayed through magnetic coupling or direct reading

• technical parameters

• Instrument model: SHF

• Installation form: Vertical installation, from bottom to top

• Indicator on-site instantaneous flow indication

• On site instantaneous flow indication with upper and lower limit alarms

• Remote transmission indicator, on-site instantaneous, cumulative flow indication, 24V DC power supply, two-wire 4-20mA output, with HART @ communication protocol, intrinsic safety explosion-proof

• Remote transmission indicator, on-site instantaneous, cumulative flow indicator, 24V DC power supply, two-wire 4-20mA output, with HART @ communication protocol, explosion-proof type

• 3.6V lithium battery power supply, on-site LCD instantaneous and cumulative flow display, no signal output

• Measurement range: Lower range 1-10L/h water, 0-0.7m3/h Air at ATP

• Upper range of 20-200m3/h water, 400-4000m3/h air at ATP

• Medium temperature: Local type -40 ℃~+300 ℃ Remote type -20 ℃~+80 ℃

• Environmental temperature: Local type -40 ℃~120 ℃ Remote type -20 ℃~70 ℃

• Accuracy: Local type ± 1.5% Remote type ± 1.0%

• Range ratio: 10:1

• Protection level: IP65 IP67

• Explosion proof mark: Exia Ⅱ CT6, this security explosive type; Exd Ⅱ CT6 Gb Explosion proof Type

• Cable interface: Intrinsic safety type: M20 × 1.5 Explosion proof type: 1/2 "NPT

• Nominal pressure: DN15-DN50 4.0Mpa DN80-DN200 1.6Mpa

• Form of jacket: insulation jacket, cooling jacket

• Connection form: Flange connection standard HG/T20592-2009

• Attachment: Magnetic Filter Straight Pipe Section

Typical application scenarios

1. Chemical industry: flow monitoring of acid-base solutions, organic solvents, gas raw materials, etc., with strong corrosion resistance

2. Petrochemical industry: crude oil, refined oil, natural gas, petroleum gas, etc., with strong adaptability to high-pressure and high-temperature working conditions

3. Medical and food products: sterile fluids, food ingredients, beverages, etc., with hygienic design that meets FDA certification requirements

4. Environmentally friendly water treatment: sewage, pure water, chemical additives, etc., low pressure loss suitable for water treatment systems

5. Metallurgical power: cooling circulating water, compressed air, steam, etc., stable and reliable, suitable for continuous production

6. Research laboratory: precise measurement of small flow rates, high precision to meet experimental requirements

Selection and installation points

1. Key parameters for selection

• Measurement medium: liquid/gas/vapor, density, viscosity, corrosiveness

• Flow range: Normal flow should be between 30% -80% of the range

• Working conditions: temperature, pressure, pipeline diameter (DN15~DN200)

• Accuracy requirement: Choose 1.0 or 1.5 level according to process requirements

2. Installation precautions

• Installation location: Avoid vibration, high temperature radiation, and strong electromagnetic field interference

• Straight pipe section: upstream ≥ 5D, downstream ≥ 3D (D is the inner diameter of the pipeline)

• Flow direction: must be consistent with the flow direction marked on the cone tube (usually from bottom to top)

• Maintenance: Regularly check the flexibility of the rotor, clean the inner wall of the measuring tube, and ensure that there are no sediments affecting the measurement accuracy