What is the difference between metal tube rotor flowmeter and glass rotor flowmeter

With the development of industry, the use of flow meters is increasing, and the types of demand are also increasing, which has promoted the rapid development of flow meters. However, rotor flowmeters have always occupied a large market. For example, glass rotor flowmeters and metal tube rotor flowmeters, these two types of rotor flowmeters are very accepted and liked by users, but there are certain differences between the two types of flowmeters.

The main measuring element of the glass rotor flowmeter is a vertically mounted tapered glass tube with a small bottom and a large top and a float that can move up and down inside. When the fluid passes through the tapered glass tube from bottom to top, a pressure difference is generated between the top and bottom of the float, and the float rises under the action of this differential pressure. When the rising force, the buoyancy and viscous lift of the float are equal to the gravity of the float, the float is in a balanced position. Therefore, there is a certain proportional relationship between the flow rate of the fluid flowing through the glass rotor flowmeter and the height of the float rise, that is, the flow area of ​​the glass rotor flowmeter. The height of the float position can be used as a flow measurement. Another important point is that the price of the glass rotor flowmeter is relatively cheap among flow meters.

Metal tube rotor flowmeter, as the name suggests, is also a rotor flowmeter. The metal tube rotor flowmeter is suitable for flow measurement of small-diameter and low-velocity media within DN200; it has reliable operation, low maintenance and long service life; it does not require high straight pipe sections; it has a wide flow ratio of 10:1; it has a large double-line LCD display, optional on-site instantaneous/cumulative flow display, and can be equipped with a backlit single-axis sensitive indication; it has non-contact magnetic coupling transmission; and it has an all-metal structure.

So what is the difference between them? First of all, let's talk about pressure resistance. After all, the glass tube rotor flowmeter is a glass graduated tube, which is fragile during delivery. The working pressure during use cannot be too high. The glass rotor flowmeter has different pressure resistance according to different calibers. The pressure resistance of different glass rotors is between 0.2Mpa and 1.0Mpa.

In terms of scale display: the glass tube rotor flowmeter has a transparent glass tube, so the scale lines are directly marked on the glass tube, and the position of the float is the natural flow rate. The metal tube rotor flowmeter has a measuring tube made of stainless steel.

Applications: Glass rotor flowmeters are mainly used in chemical, petroleum, light industry, medicine, fertilizer, chemical fiber, food, dye, environmental protection and scientific research departments to measure the flow of single-phase non-pulsating (liquid or gas) fluids. Anti-corrosion glass rotor flowmeters are mainly used to detect the flow of corrosive liquids and gaseous media, such as strong acids, strong alkalis, oxidants, strong oxidizing acids, organic solvents and other corrosive gas or liquid media.

Metal tube rotor flowmeter is suitable for high temperature, high pressure and highly corrosive media; can be used in flammable and explosive dangerous places; can choose two-wire system, battery, AC power supply mode; multi-parameter calibration function; with data recovery, data backup and power-off 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, and can be connected to the PCL system to set the alarm function.

The specific flow meter selection should be based on the performance and function of the flow meter. Choosing the right flow meter for different needs is the most appropriate choice.