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How to read a rotor flowmeter? Why?
The reading method for the rotor flowmeter is as follows: For the sub flowmeter reading method, stand in front of the flowmeter, with your eyes parallel to the float, and move your line of sight horizontally to the left until you see the outline of the float touching the positioning line. The corresponding reading value is at the intersection of the positioning line and the horizontal scale in the middle of the float.. A rotor flowmeter measures fluid flow based on the principle of throttling, but it changes the flow area of the fluid to maintain a constant differential pressure between the upper and lower parts of the rotor. Therefore, it is also known as a variable flow area constant differential pressure flowmeter or a float flowmeter. In a vertical conical tube that expands from bottom to top, the gravity of the circular cross-section float is supported by liquid dynamics, and the float can freely rise and fall inside the conical tube. Under the action of flow velocity and buoyancy, it moves up and down, and after balancing with the weight of the float, it is transmitted through magnetic coupling to indicate the flow rate on the dial. Generally divided into glass and metal flutter rotor flow meters. Metal rotor flowmeter is the most commonly used in industry. For small diameter corrosive media, glass material is usually used. Due to the inherent fragility of glass material, rotor flowmeters made of precious metals such as all titanium are also used for key control points. Rotary flowmeter is a variable area flow meter based on float position measurement. Adopting an all metal structure and modular concept design, it has low pressure loss, large range ratio (10:1),
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2. How to read a glass rotor flowmeter
Read the scale with your eyes level with the upper plane of the rotor, starting from the 0 scale direction.
. The data read on the rotor flowmeter is instantaneous flow rate, either volumetric flow rate or mass flow rate. If it is a mass flow rate, you first convert it to a volume flow rate (unit: m3/s), and then estimate it by dividing the volume flow rate by the cross-sectional area based on the diameter of the rotor flowmeter (note: this is an estimation of early closing travel, because the cross-sectional area is not linear). The scale of the glass rotor flowmeter is calibrated by the production plant under local conditions using water and dry air as media that are close to ideal fluids. However, there are two situations where the scale value of a normal flowmeter cannot be directly used: first, when the measuring medium is not water and air, and second, when the measuring medium is land bench water and air, but its state (temperature, pressure) is different from the scale state. In this way, when using a flow meter, there is a problem of needing to correct the scale values in order to obtain accurate measurement results. Therefore, solving the calibration correction of glass rotor flow meters is the key to using this type of instrument effectively.3. How to read a glass rotor flowmeter
The method of reading the celery number in the sedan chair by the flow meter is to observe the position of the rotor and read the scale.
.1、 Observe the position of the rotor: Stand in front of
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