Product Overview

The metal tube rotameter is a flow measurement instrument with a simple structure and reliable performance. Thanks to its core advantages such as high precision and wide applicability, it is widely used in flow measurement scenarios for various gases and liquids, suitable for a variety of industrial working conditions.

Compared with traditional glass rotameters, this product has significant advantages in terms of pressure resistance, being able to operate stably under higher pressure conditions, effectively avoiding the safety hazards of glass materials in high-pressure environments, while retaining the core features of rotameters such as convenient operation and stable measurement, taking into account both safety and practicality.

Among them, the LZ series metal tube rotameter has a rich variety of products, extremely strong adaptability, covering a variety of functional models, and can meet the personalized needs of different scenarios: including the local indication type, which facilitates direct on-site reading of flow data; the electric remote transmission type, which supports remote data monitoring and transmission and is compatible with automated control systems; the limit switch alarm type, which can provide real-time feedback on abnormal flow and trigger an alarm to ensure production safety; It comes in various specifications, including corrosion-resistant, jacketed, damped, explosion-proof types, etc., capable of handling complex working conditions such as corrosive media, high and low temperatures, vibration, and explosive environments, providing accurate and reliable flow measurement solutions for multiple industries such as petrochemical, metallurgy, municipal, power, and pharmaceutical.

Working Principle

The metal tube rotameter consists of two parts:

Signal Transmitter —- Indicator;
Sensor — Measuring tube and float;

• the contact medium materials of the sensor include four types: stainless steel, Hastelloy, titanium, and stainless steel lined with polytetrafluoroethylene (PTFE); users can select different wetted materials according to different process pressures and corrosion resistance requirements of the medium to meet the pressure resistance and anti-corrosion requirements of the process. Users can select different indicator combinations during model selection according to different measurement requirements to meet different measurement needs. The specific indicator forms and their corresponding functions are shown in the indicator type spectrum table.

Flow measurement is performed by the transmitter inside the indicator. The transmitter indicates the flow rate by sensing the change in the position of the float through the coupling magnetic steel and outputs a signal for remote transmission. When the measured medium flows through the measuring tube from bottom to top, the float remains relatively stationary at a certain position when the gravity, buoyancy, and the vertically upward driving force of the fluid flow velocity on the float reach equilibrium. This position varies with the annular area between the float and the conical tube and the fluid flow velocity, and the position of the float corresponds to the magnitude of the flow rate of the measured medium.

Product Features

• Single-axis, non-contact new magnetic coupling structure, with more stable signal transmission;
• Modularized combined design, easy to maintain, maintenance-free during normal use;
• The dual-line large-screen LCD display can show instantaneous flow and cumulative flow, with optional backlight;
• The intelligent type has power-off protection, data backup, and recovery functions;
• All-metal structure, resistant to earthquake, compression, temperature, and corrosion;
• short stroke, total height 250mm, designed for easy installation.

Product Parameters

Measurement Range	Liquid (20°C) 2.5 to 100,000 liters per hour
	气体(0.1013 MPa, 20°C) 0.07 – 3000 m³/h
Range Ratio	10:1（DN≤100mm） 5:1（DN>100mm）
Accuracy Class	1.5（DN＞100mm）
Work Pressure	DN10 – DN50 PN4.0MPa (Special Type 25MPa)
	DN65～DN100 PN1.6MPa (Special Type 16MPa)
	Jacket pressure rating: 1.6 MPa
Medium Temperature	Standard Type -40°C to +100°C
	High-temperature type 400°C
	Lined with F46 fluoroplastic: -40°C to +80°C, lined with PTFE: -10°C to +100°C
Ambient Temperature	Pointer type: -40°C to +65°C
	Intelligent type: -25°C to +65°C
Medium viscosity	DN10： ≤5mPa.s(H15.1～H15.3)
	≤30mPa.s(H15.4～H15.9)
	DN25：≤250mPa.s
	DN50～DN100：≤300mPa.s
Power Supply	Standard type: 24VDC, ripple ≤ 5%
	Battery type: One 3.6V lithium battery, which can last for one year
Connection Method	Flange
	Thread
	User-specified
Electrical Interface	M20×1.5、PG11、1/2”NPT
Protection Class	IP65
Explosion-proof Marking	Intrinsically Safe Type: ExiaIICT3～6
	Explosion-proof type: ExdIIBT4