Metal tube float (rotor) flowmeter-SN60A

Suitable for small diameter and low flow rate media flow measurement
- Reliable, low maintenance and long life
-Low requirements for straight pipe sections
- Wide range ratio 10:1
-Dual line LCD with instantaneous/accumulative flow display
- Keypad on the indicator, easy to operate and set up
- All-metal construction, suitable for high temperature, high pressure and strong corrosive media.
Non-contact magnetic coupling drive
-Can be used in flammable, explosive hazardous occasions
- DC power supply or battery power supply available
With data recovery, data backup and power-down protection function.
-Multi-parameter calibration function

Metal tube float flowmeter mainly consists of two main components: sensor and indicator. The sensor consists of a connecting flange, a measuring cone, a float and an upper and lower guide; the indicator consists of a shell, a magnetic drive system, a dial and an electrical telemetry system. Inside the vertical conical measuring tube, there is an upward and downward movable measuring part, the float (Figure 1). When the fluid passes through the conical tube from bottom to top, the float is forced by the fluid and moves upward along the conical tube. As the fluid flow increases, the displacement of the float increases; conversely, as the fluid flow decreases, the displacement of the float decreases. In other words, the flow rate of the fluid determines the position of the float in the measuring tube and thus the size of the annular area between the float and the conical tube. When the fluid flow is maintained at a constant flow rate Q, the float is in dynamic equilibrium at position h in the conical tube, where the annular area between the float and the conical tube remains constant. The float is subjected to three forces: the gravitational force of the float G, the buoyant force of the float F, and the force of the fluid on the float P. These three forces are in equilibrium. According to the fluid dynamics of the Park's endeavour equation, the principle of force equilibrium and the law of fluid continuity, it can be calculated at this time through the annular area of the instantaneous fluid flow, so the metal tube float flowmeter is the principle of variable area measurement of flow. Figure 1 Inside the float, embedded in a high-performance permanent magnet, when the float is in the equilibrium position, the float around the formation of a uniform and stable magnetic field. On the outside of the conical tube, a magnetic sensor is installed, so that the linear displacement of the float in the measuring tube can be transmitted to the indicator through non-contact form, and after detection and processing, it is finally displayed on the indicator dial or output the corresponding standard 4-20mA current signal.