Metal Tube Float Flow Meter Overview

1. The metal tube float flowmeter employs a variable area measurement principle, suitable for measuring liquids and gases. It features a full metal structure and comes in indicator, electrical remote transmission, corrosion-resistant, high-pressure, jacketed, and explosion-proof models. It offers standard analog signal output of 0-10mA and 4-20mA, along with on-site indication. It includes features such as cumulative measurement, digital communication, on-site parameter modification, various power supply methods, magnetic filters, and special specifications. It is widely used in industries such as oil, chemical, power generation, food, and water treatment, as well as in the measurement of flow in complex, harsh environmental conditions and various media conditions. 2. The metal tube float flowmeter is a commonly used variable area flow measurement instrument in industrial automation process control. It is characterized by its small size, wide detection range, and ease of use. It can measure the flow of liquids, gases, and steam, particularly suitable for low flow and low flow rate medium flow measurement.

Features of the measuring section of the metal tube float flowmeter

Robust all-metal structure designed float flow meter

2. Indicator with an independently designed conceptual measuring tube

3. Available options include stainless steel, Hastelloy, titanium, and PTFE material measurement systems

4. Low-pressure loss design

5. Short stroke, compact structural design, total gauge height 250

6. Magnetic coupling structure ensures more stable data transmission and signal

7. Insulating or heated jacket

8. Vertical, horizontal, and various installation methods are more suitable for different usage scenarios.

9. Suitable for low-pressure and low-flow rate medium flow measurement

10. Reliable performance, low maintenance, and long lifespan

11. No strict requirements for straight pipe sections

12. A wider flow ratio of 10:1

13. Dual-line large LCD display, optional for real-time/total flow rate display, with backlit available

14. Single-axis Sensitivity Indicator

15. Non-contact Magnetic Coupling Transmission

16. Full metal construction, suitable for high temperatures, high pressures, and strongly corrosive media

17. Suitable for flammable and explosive hazardous environments

18. Select secondary system, battery, and AC power supply method

19. Multi-parameter Calibration Function

20. With data recovery, data backup, and power failure protection features

Metal Tube Float Flow Meter Main Technical Parameters

◇Measuring Range: Water (20℃) 1-200,000 l/h; Air (20℃, 0.1013MPa) 0.03-4,000 m3/h; See flow chart, special flow rates available upon request.

◇Range Ratio: Standard Type 10:1

◇Accuracy: Standard Type 1.0; Special Type 0.5

◇Pressure Class: Standard Type: DN15-DN50 4.0MPa, DN80-DN200 1.6MPa

Special Type: DN15-DN50 25MPa, DN80-DN200 16MPa

The jacket pressure rating is 1.6 MPa.

Special types should be negotiated with the factory prior to selection and ordering.

◇ Pressure Loss: 7kPa - 70kPa

◇Medium Temperature: Standard Type: -80℃ to +200℃; PTFE: 0℃ to 85℃

High Temperature Type: *Up to 300℃

◇Medium Viscosity: DN15: η<5mPa.s (F15.1-F15.3) / η<30mPa.s (F15.4-F15.8)

DN25：η<250mPFa.s            

DN50-DN150：η<300mPa.s

◇Ambient Temperature: Pointer Type -40℃ to +120℃

◇ Connection Type: Standard Type: DIN 2501 Standard Flange

Special Type:法兰 or螺纹 as per customer's specification

Cable Interface: M20*1.5

Power Supply: Standard Type: 24VDC two-wire system 4-20mA (10.8VDC-36VDC)

Alarm Output: High or low limit instantaneous flow alarm, collector open circuit output (*up to 100mA @ 30VDC, internal resistance 100 ohms)

Relay Output (Contact Rating: 1A @ 30VDC or 0.25A @ 250VAC or 0.5A @ 125VAC)

◇Pulse Output: Accumulative pulse output, *with a small interval of 50 milliseconds

LCD Display: Instantaneous Flow Rate Display Range: 0-50,000

Cumulative traffic display value range: 0 - 99999999 (can include decimal points)

◇ Protection Class: IP65

◇ Explosion-proof marking: Intrinsically safe type iaⅡCT5

Explosion-proof dⅡBT6 SYTFLZ-250 metal tube float flowmeter measurement range

Corrosion-resistant Type Pipe Diameter DN (mm) Standard Type Pipe Diameter DN (mm) Flow Rate Range *High Pressure Loss

Air flow: m³/h @ 20°C, 0.101325 MPa; Water flow: L/h @ 20°C; Air pressure: kPa; Water pressure: kPa

The Converter Indicator actually converts the height of the float inside the cone tube into a corresponding volume flow scale. In terms of output signals, there are on-site display models and remote signal output models: On-site display model: The rotating magnetic steel in the on-site indicator couples with the magnetic steel inside the float, causing rotation. At the same time, the electric pointer indicates the current flow volume through the scale disk.

The flow coefficient of the α gauge varies due to the shape of the float.

When the fluid being tested is a gas, the coefficient of thermal expansion is typically ignored due to the small correction factor, as it has already been included in the discharge coefficient through verification. If the fluid is liquid, then ε = 1.

△F Circulating Ring Area, m²

Local gravitational acceleration, m/s².

Vf Buoyant Volume, including any extension, in m³

ρf Buoyant material density, kg/m³

ρ Density of the fluid under test, for gases, it is the density at the cross-section above the float, kg/m³.

Ff Cross-sectional area at the float ball working diameter (*large diameter), m²

Gf Buoy Weight, kg.

The relationship between the flow ring area and the float height is shown in Equation (3), and when the structural design is fixed, d and β are constants.

There is a quadratic term with h, which generally cannot