principleMetal rotor flowmeter is a kind of variable area flowmeter. In a vertical cone tube that expands from bottom to top, the gravity of a float with a circular cross-section is borne by the hydrodynamic force, and the float can rise freely in the cone. And drop. It moves up and down under the action of flow velocity and buoyancy, and after balancing 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 rotameters. Metal rotor flowmeters are the most commonly used in the industry. For corrosive media with small pipe diameters, glass is usually used. Due to the fragility of glass, the key control point is also a rotor flowmeter made of precious metals such as titanium. .Features:▲Single-axis sensitive indication, reliable work, low maintenance, long life▲The requirements for straight pipe sections are not high▲Wide flow rate ratio 10:1, particularity: 20:1▲Suitable for small diameter and low flow rate medium flow measurement▲LCD display, can display instantaneous flow and cumulative flow at the same time, with backlight▲Non-contact magnetic coupling transmission▲All-metal structure, suitable for high temperature, high pressure and strong corrosive media, can be used in flammable and explosive hazardous situations▲Optional two-wire system, battery, AC power supply mode▲Multi-parameter calibration function, with data recovery, data backup and power-down protection functionstechnical parameter:▲Measuring range: water 1～200,000L/h (20℃); air: 0.03～6000m3/h (20℃, 0.1013MPa) (special flow rate can be customized)▲Turndown ratio: standard type 10:1, special type 20:1▲Accuracy: standard type 1.5 grade, special type 1.0 grade▲Pressure rating: Standard type: DN15～DN50≤4.0MPa; DN80～DN200≤1.6MPa;▲High pressure type: DN15～DN50≤32MPa; DN80～DN200≤16MPa▲The pressure rating of the jacket: 1.6MPa, special type should be negotiated with the factory before selecting and ordering▲Pressure loss: 7KPa～70KPa▲Medium temperature: Standard type: -40℃～+100℃; PTFE: -50℃～100℃ (No frequent temperature changes are allowed)▲High temperature type: 110℃～450℃▲Medium viscosity: DN15: η<5mPa. s(F15.1～F15.3), η<30mPa. s(F15.4～F15.8)▲DN25: η<250mPa. s; DN50～DN200: η<300mPa. s▲Ambient temperature: remote transmission type: -40℃～+85℃ (the liquid crystal will not be damaged, the liquid crystal normally works at -30℃～+80℃)▲Local pointer type: -40℃～+100℃▲Connection form: standard type: DIN2501 standard flange; special type: any standard flange or thread specified by the user▲Cable interface: flameproof type is 1/2NPT internal thread, other M20×1.5 internal thread▲Power supply: Standard type: 24VDC two-wire system 4～20mA (12VDC～32VDC)▲Alarm type: 24VDC four-wire system 4～20mA (18VDC～28VDC)▲AC type: 85～265VAC50Hz▲Battery type: 3.6V7.5AH lithium battery, can be used continuously for three yearsSelection of metal rotor flowmeter1. For the selection of remote transmission type metal rotor flowmeter, choose a flowmeter that is suitable for the explosion-proof type requirements of the place of use; when installing, pay attention to the fastening of the casing and the sealing of the wiring port after the meter is energized. Erosion requirements.2. For places where the temperature of the measured medium is too high (>220℃) or too low, it is usually necessary to take heat preservation or heat insulation measures for the sensor part of the flowmeter to ensure the signal converter—— indicator For normal working environment temperature, high temperature indicator should be selected.3. For some measured media that need to be insulated or cooled, jacket type flowmeters should be selected.4. For the unstable pressure of the medium at the inlet of the flowmeter, especially for gas measurement, a damping structure should be selected to ensure accuracy and service life.5. The pressure level required for the medium is relatively high. When the pressure level exceeds the standard, please select the high-pressure type structure when selecting the type. The high-pressure type adopts HG20595-97RF necked butt-welded steel pipe flanges.6. The measurement accuracy of the metal rotor flowmeter is generally 2.5. When the measurement accuracy is required to be high, the metal rotor flowmeter should not be selected.Metal rotor flowmeter installation requirements1. Before installation, remove the ejector rods, fillers, rubber bands, etc. used for the transportation and protection of the flowmeter, change the position of the float, and check the operation status of the converter. If it is considered abnormal, it should be adjusted.2. The flowmeter should be installed vertically on a vibration-free pipeline, and the inclination of the measuring tube should be less than 5°, and a bypass should be installed to facilitate maintenance and cleaning without affecting production.3. The flowmeter should be strictly calibrated with a level meter when installing, and should not be stressed during assembly. The medium flow direction of the vertically installed rotameter is bottom-up, and the medium flow direction of the horizontally installed rotameter should be consistent with its marked direction. In order to facilitate the use and disassembly and inspection, it is generally required to install the valve block.4. The remote transmission part of the remote-transmission metal rotor flowmeter is coupled with the rotor by magnetism. If the medium contains small particles that are easily adsorbed by magnetic substances, the rotor is easily worn and jammed, causing inaccurate or impossible measurement. , The solution is to install a magnetic filter in the front.5. A valve should be installed upstream of the flowmeter, and a flow regulating valve should be installed downstream of 5 to 10 times the diameter of the meter.6. The meter does not have strict requirements on the length of the upstream straight pipe section, but some manufacturers require that the location of the flowmeter should ensure that the inlet has a straight pipe section ≥ 5DN, and the outlet does not have a straight pipe section ≤ 250mm or (2-5) D length, which is actually necessary Little sex.
Post time: 21-09-21