Metal tube float flowmeter

Metal tube float flowmeterIt is a flow meter based on the principle of variable area measurement, which measures the flow rate of liquids, gases, and vapors by changing the position of the float in a vertical conical tube, especially suitable for measuring low flow rate and small flow media. The following are its core points:

1、 Working principle

When the fluid passes through the conical measuring tube from bottom to top, the float is subjected to upward buoyancy and downward gravity. When the flow rate increases, the float rises and the circulation gap area increases accordingly until buoyancy and gravity are balanced. The height of the float corresponds to the flow rate, and the displacement signal is transmitted to an external indicator through magnetic coupling to achieve flow display.

2、 Structural characteristics

All metal designMade of corrosion-resistant materials such as stainless steel, Hastelloy, and titanium, suitable for high temperature, high pressure, and highly corrosive media.

Cone-shaped measuring tubeThe float moves freely inside the tube, and the annular gap area changes with the flow rate, ensuring measurement linearity.

Magnetic coupling transmissionThe displacement of the float is transmitted to the indicator through magnetic coupling, avoiding mechanical wear and ensuring stable signals.

Diversified structureIncluding indicator type, electric remote transmission type, corrosion-resistant type, high-voltage type, jacket type, explosion-proof type, etc., to meet the needs of different working conditions.

3、 Core advantages

high-precision measurementThe accuracy level is usually ± 1.0%~± 2.0%, and some models can reach ± 0.5%, suitable for trade settlement and high-precision scenarios.

wide range ratioThe standard range ratio is 10:1 and can reach 25:1, covering a wide range of flow changes.

Low pressure lossDesign optimization reduces fluid resistance and energy consumption.

Adaptable：

Media TypeLiquids, gases, and vapors can all be measured.

temperature rangeStandard type -80 ℃~+200 ℃, high temperature type can reach 400 ℃.

pressure ratingThe standard type can reach 4.0MPa, while the high-pressure type can reach up to 32MPa.

Flexible installationSupports vertical and horizontal installation, with low requirements for straight pipe sections, saving space.

Easy maintenanceSimple structure, no complex electronic components, low failure rate, long lifespan.

4、 Application Fields

petrochemicalCatalyst transportation, gas separation, fine chemical production, etc.

Food and PharmaceuticalBeverage production, wastewater treatment, liquid medicine flow control, etc.

Electric MetallurgyCooling water monitoring, steam flow measurement, etc.

Environmentally Friendly Water TreatmentWastewater discharge monitoring, sludge flow measurement, etc.

Mechanical ManufacturingFlow control of cutting fluid, lubricating oil, etc.

5、 Key selection points

medium characteristics：

Corrosive medium: Choose corrosion-resistant materials such as Hastelloy and titanium.

Containing solid particles: Install a filter to prevent the float from getting stuck.

flow rangeEnsure that the actual flow rate is between 20% and 80% of the range to avoid over range or low flow errors.

Pressure and temperatureChoose high-pressure or high-temperature flow meters based on the operating conditions.

signal outputSelect 4-20mA current signal, RS485 communication or HART protocol according to requirements, and support remote monitoring.

Installation methodVertical installation takes priority, while horizontal installation needs to consider the influence of the float's own weight.

6、 Precautions

Grounding and Explosion proofThe shell needs to be reliably grounded, and safety barriers should be installed in explosion-proof situations.

electromagnetic interferenceAvoid strong magnetic field environments and control cable parameters during wiring.

Medium purificationWhen containing impurities or ferromagnetic substances, filters or magnetic filters need to be installed.

Pulsating flow processingFor large pulsating flow or two-phase flow conditions, it is necessary to install buffers or choose damping flow meters.

7、 Typical model parameters

measurement range：

Water: 1~200000 L/h

Air (20 ℃, 0.1013MPa): 0.03~4000 m ³/h

accuracy classStandard type 1.0 level, special type 0.5 level.

pressure loss7 kPa to 70 kPa

connection methodFlange connection (DN15~DN200), threaded connection (small diameter).

8、 Summary

Metal tube float flowmeterDue to its high precision, wide range, strong adaptability, and easy maintenance, it has become an important tool for industrial flow measurement. When selecting, it is necessary to comprehensively consider the characteristics of the medium, flow range, pressure and temperature, and signal output requirements to ensure measurement accuracy and system stability. It is widely used in fields such as petroleum, chemical, food, and pharmaceuticals, providing reliable support for industrial automation control.

Note: 1. The prices on the system are only reference prices and not actual prices;

2. Flow meters vary in specifications, diameters, and configurations, resulting in different prices. We need to select and quote based on your operating conditions~

After sales and warranty

All products supplied by Duoqin Instrument (Shanghai) Co., Ltd.:

All products come with a 2-year warranty;

Provide free telephone consultation, guidance on installation and debugging services;

Negotiate on-site guidance for installation, debugging, and other matters, and only charge reasonable travel expenses;

Large quantities can provide free on-site guidance for installation and debugging.