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1. Principle and function of metal tube float flowmeter. Where to read the float flowmeter? The principle of metal tube float flowmeter is based on the pressure difference generated when the fluid passes through the gap between the float and the measuring tube to balance the weight of the float. Its main function is to measure the instantaneous flow rate and cumulative flow rate of gas or liquid. The reading of a float flowmeter is usually checked on an indicator or signal transmitter. Principle: When a fluid passes through a metal measuring tube, the float is balanced by gravity, buoyancy, and the vertical thrust of the fluid on the float. The rising height of the float is directly proportional to the fluid flow rate, so the position of the float directly reflects the flow rate of the measured medium. Function: Measuring instantaneous flow rate: Float flowmeter can intuitively measure the instantaneous flow rate of gas or liquid, and read it through electronic digital display or pointer display. Measuring cumulative flow rate: In addition to instantaneous flow rate, the float flow family dust meter can also measure cumulative flow rate and read it through the value on the signal transmitter. Reading View: Pointer Reading Megahertz Zen: Usually used to read instantaneous flow, the position of the pointer indicates the current flow value. LCD reading: It can provide more accurate flow readings, including instantaneous and cumulative flow, usually viewed on signal transmitters or advanced display devices. 2. High flow rate of float flowmeter
The high flow model of float flowmeter is mainly achieved by increasing the pipe diameter, optimizing the float design, and improving the material. The key parameter
(1) Structural optimization - using DN80-DN200 large-diameter cone tube (standard type is DN15-DN50) to reduce flow chain resistance - using hollow metal float or guide rod to stabilize the structure and avoid severe shaking under high flow - expanding the flow range ratio to 10:1 or 20:1 (standard type usually 5:1-10:1)
(2) Material upgrade - cone tube: 304/316 stainless steel lined PTFE (resistant to high pressure corrosion) - float: Hastelloy alloy/titanium alloy (to cope with high-speed fluid impact) - shed resistance - sealing: metal wrapped gasket+graphite packing (pressure can reach PN40) 2 Key parameter comparison (based on the 2024 catalog of mainstream domestic manufacturers) | Parameter types | Standard flow meters | High flow models | | ---------------------------------------------------------------------------------------------------------------------------------------------------------------- Key points for selection and implementation -20% flow margin should be reserved to avoid float jamming - Vertical installation requires front and rear straight pipe sections to be ≥ 5DN (front) and ≥ 3DN (rear) - Viscosity compensation: For fluids>100cP, separate calibration is required - Danger warning: using beyond the range may cause float impact and damage to glass cone tubes, and metal tubes need to pay attention to electrostatic grounding 4 Typical application scenarios - Chemical industry: DN150 caliber Teflon lined type for hydrochloric acid transportation (flow range 30-300 m ³/h) - Water treatment: DN200 stainless steel type for backwash pipe
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