The difference between glass rotameter and metal tube rotameter

Rotameters Introduction:

The main measuring elements of the glass rotor flowmeter are a vertically installed lower small and upper large conical glass tube and a float that can move up and down. When the fluid passes through the conical glass tube from bottom to top, a pressure difference is generated between the upper and lower floats, and the float rises under the action of this differential pressure. When the rising force, buoyancy and viscous lift of the float are equal to the weight of the float, the float is in an equilibrium position. Therefore, there is a certain proportional relationship between the flow of fluid flowing through the glass rotameter and the rising height of the float, that is, the flow area of theglass rotameter, and the height of the position of the float can be used as a flow measurement. It is also very important that the glass rotor flowmeter is relatively cheap in flow meters.

The metal tube rotameter is also a rotameter according to the name. The metal tube rotameter is suitable for measuring the flow of small-diameter and low-velocity media within DN200; it is reliable in operation, small in maintenance, and long in life; it is not required for straight pipes. High; wide flow ratio 10:1; double-line large liquid crystal display, optional on-site instantaneous/cumulative flow display, single-axis sensitive indication with backlight; non-contact magnetic coupling transmission; all-metal structure.

Metal rotameters are generally divided into two categories: glass rotameters and metal tube rotameters according to the material of the tapered tube. The former is generally a local indication type, and the latter is generally made into a flow transmitter. According to the different converters, the metal tube rotor flowmeter can be divided into gas remote transmission, electrical remote transmission, indicating type, alarm type, belt integration, etc.; according to the structure and purpose of the transmitter, it can be divided into basic type and jacket Insulation type, anti-corrosion type, high pressure type, high temperature type, etc.

Rotameter is also called float flowmeter. It is a kind of variable area flowmeter. In a vertical cone tube that expands from bottom to top, the gravity of the float with a circular cross section is borne by the hydrodynamic force. The float can rise and fall freely in the cone. It moves up and down under the action of flow velocity and buoyancy, and after being balanced with the weight of the float, it is transmitted to the dial to indicate the flow rate through a magnetic coupling. Generally divided into glass and metal rotor flow meters, float flow meters. Metal rotor flowmeters are the most commonly used in the industry. For corrosive media with small diameters, glass is usually used. Due to the fragility of the glass material, the key control point is also a rotor flowmeter made of all titanium and other precious metals. (Float flow meter).

Rotameter is a variable area flow meter based on float position measurement. It adopts all-metal structure, Modular concept design, its pressure loss is small, the range ratio is large (10:1), the installation and maintenance are convenient, and it can be widely used in complex and harsh Flow measurement and process control of environment and various media conditions.

Then what is the difference between them? First of all, let's talk about the pressure resistance. After all, the glass tube rotor flowmeter is a glass graduated tube. It is fragile during delivery. The working pressure should not be too high during use. The glass rotor flowmeter has different pressure resistance according to different diameters. Between 0.2Mpa and 1.0Mpa.

Scale display aspect: The glass tube rotameter, the glass tube is transparent, so the scale line is directly calibrated on the glass tube, and the position of the float is of course the flow rate. The metal tube rotameter is made of stainless steel because the measuring tube is made of stainless steel.

Rotameter application:

The glass rotor flowmeter is mainly used in various departments such as chemical industry, petroleum, light industry, medicine, fertilizer, chemical fiber, food, dyes, environmental protection and scientific research, to measure single-phase non-pulsating (liquid or gas) fluids flow. The anti-corrosion glass rotor flowmeter is mainly used for the detection of the flow of corrosive liquids and gaseous media, such as the flow detection of strong acids, strong bases, oxidants, strong oxidizing acid, organic solvents and other corrosive gas or liquid media.

The metal tube rotor flowmeter is suitable for high temperature, high pressure and strong corrosive media; it can be used in flammable and explosive hazardous situations; optional two-wire system, battery, AC power supply; multi-parameter calibration function; with data recovery, data backup and Power-down protection function.

Another point is that the glass rotor flowmeter does not have a signal output, while the metal tube rotor flowmeter is different. It can have a remote signal output, 4-20mA, which can be connected to the PCL system to set the alarm function.The specific flowmeter selection depends on the performance and function of the flowmeter. Choosing the right flow meter for different needs is the most suitable choice.