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The basic knowledge, the metal flow meter common failures and solutions

by:KAIDI     2021-01-29
Metal flow meter, it is a kind of mechanical flowmeter, commonly used to measure gas and liquid, is widely used in various occasions. At the scene will encounter all sorts of problems in use process, the following instrument and meter plant is often the problems to give you the concrete introduce. A slight pointer jitter, pointer jitter (1) : usually caused by fluctuations in medium. Can adopt the method of increasing damping to overcome; (2) moderate pointer jitter, usually caused by medium flow state. Is often caused by unstable operating pressure of medium for gas. Can use voltage or current regulator devices to overcome or increase the rotameter gas damping; Due to intense pointer jitter (3) : medium pulse, pressure instability or a user of other operating status of pressure, temperature, flow rate does not accord with the actual state of the rotor flowmeter, has a bigger difference caused by the rotor flow meter range. Second, the cursor to a position did not move because of the rotameter used usually open valve too fast, make the rotor fast upward shock stop, stop deformation caused rotor card to death. But does not rule out due to the rotor guide bar with different heart stop ring, causing rotor. In processing, instrument can be removed, the deformation of plastic surgery to stop off, and check whether with guide bar work, such as different heart can be calibrated, then the rotor installed, push the rotor, feeling the rotor unimpeded card can be up and down, in addition, the rotor flowmeter installation must be vertical or horizontal installation, cannot tilt, otherwise easy to cause the card table, and also brings to the measurement error. Three, large measurement error (1) installation does not conform to the requirements. For vertical installations to keep vertical rotor flowmeter, dip Angle is not more than 20 degrees; For horizontal rotor flowmeter must keep level, tilt Angle is not more than 20 degrees, 100 mm space around the rotor flowmeter can not have ferromagnetic objects, stay away from the valve installation position process pipeline diameter changes, pump discharge, corner, etc. Keep straight pipe for the 5 d before and after the straight pipe is 250 mm. (2) the change of the density of the liquid medium is bigger, this is also a cause of error is bigger. Because the instrument before calibration, it will be medium conversion, according to the density of users give converted to calibration status of water flow to carry on the calibration, so if the change of medium density is bigger, can cause very big error of measurement. Solution can be change after medium density into the formula of the conversion error correction coefficient, then put the meter to measure flow rate multiplied by the coefficient for the real traffic; (3) gas medium as affected by temperature and pressure is larger, the proposal USES way of temperature, pressure compensation for the real traffic. (4) caused by long-term use and many factors such as pipeline vibration sensing magnetic steel rotor flowmeter, Pointers and counterweight, rotating magnetic steel parts loose, caused the error. Solution: can use first hand push pointer in validation. First of all, the position of the pointer on the RP to see if the output is 4 ma, flow display is 0%, and in turn according to the calibration for validation. If found, can be adjusted to place parts. Generally require professional personnel adjustment, otherwise it will cause the loss position, need to return to factory. Four, no current output (1) the first see the wiring is correct; (2) LCD display, if there is a display without output, more for the output pipe bad, need to replace the circuit board; (3) loss of calibration value: failure due to E2PROM chips was introduced, instrument calibration data loss, can also cause no output current, current will remain the same. Solution: the available data recovery operations, if don't work, can set password data in 2000, the first to set the password data in 4011, the calibration method is to use push pointer from the RP to 100% of the data. Five, no scene shows (1) check the wiring is correct; (2) check whether the power supply is correct; 3. Reinstall the LCD module, check contact false; (4) for multiple wire power supply check whether 12, 13 terminals meet ammeter or short circuit. Six, the liquid crystal display 0 or full scale (1) set up the parameter range, zero check 2000 passwords. Requires ZERO less than the value of the SPAN, the two values cannot be equal; (2) check whether the sampling data, push the pointer to see samples values change with the hand, if there is no change, usually in the fault circuit, sampling circuit, need to change the circuit board; Seven, alarm set d is incorrect (1) check deviation value can't be too big; (2) the FUN function, logic function is correct. HA- A for maximum logic. LA- A for the lower limit is logic; (3) check alarm value set in the SU size; (4) if the liquid crystal bar code instructions is correct, the output no action, can check whether the external power supply and external power of the cathode is connected to the cathode and the instrument power supply; (5) circuit board fault, replace the circuit board.
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