Fault Analysis of Metal Tube Floater Flowmeter
A pointer jitter:
　　 1 . Slight hand jitter: generally caused by medium fluctuations. It can be overcome by adding damping.
　　 2 . Moderate pointer jitter: Generally caused by the medium flow state. For the gas is generally caused by the media operating pressure instability. Regulators or steady flow devices can be used to overcome or increase the air damping of the float flowmeter.
　　 3 . Severe pointer jitter: mainly due to medium pulsation, air pressure instability or the pressure, temperature, and flow rate of the gas operating state given by the user is inconsistent with the actual state of the float flowmeter, and there is a large difference in the over-range of the floater flowmeter.
Second, the pointer stops at a certain position
The main reason is that the float of the float meter is stuck.
Generally, when the float meter is used, the valve is opened too fast, so that the float impacts the stopper quickly and causes the stopper to deform and the floater to get stuck. However, it is not ruled out that the float is stuck due to the misalignment of the float guide rod and the stop ring. The instrument can be removed when processing, remove the deformed stopper, and check if it is concentric with the guide rod. If it is different, correct it, then install the floater, push the floater, and feel the float up and down smoothly. In addition, when installing the float flowmeter, it must be installed vertically or horizontally, and it cannot be tilted, otherwise it will easily cause the card table and bring errors to the measurement.
Third, the measurement error
　　 1 . Installation does not meet requirements;
For the vertical installation of float meter to maintain vertical, tilt angle of not more than 20 degrees;
For the horizontal installation of float meter to maintain the level, the inclination is not more than 20 degrees;
There must be no ferromagnetic objects in the 100mm space around the float flowmeter ;
The installation location should be far away from the valve changing port, pump outlet, process pipeline turning and so on. To maintain the requirements of the 250mm straight section after the first 5D .
　　 2 . The greater variation in the density of the liquid medium is also a cause of the larger errors. Since the instrument is calibrated according to the density given by the user before the calibration, the flow rate of the water in the calibration state is calibrated. Therefore, if the medium density changes greatly, it will cause great errors in the measurement. The solution can bring the changed media density into the formula and convert it into the error correction factor. Then, the flow rate measured by the flow meter is multiplied by the coefficient to change the real flow rate.
　　 3 . Because of the great influence of temperature and pressure on the gaseous medium, it is recommended to use warm and pressure compensation to obtain real flow.
　　 4 . Due to long-term use and many factors such as pipeline vibration, the floating flowmeter senses the looseness of moving parts such as magnets, pointers, counterweights, rotating magnets, etc., resulting in large errors. Solution: You can verify by first pushing the pointer by hand. First press the pointer on the RP position to see if the output is 4mA and the flow rate display is 0% . Then verify by the scale. If no match is found, the part can be repositioned. Generally require professionals to adjust, otherwise it will cause loss of position, need to return to the manufacturer for correction.
Fourth, no current output
　　 1 . First look at the wiring is correct.
　　 2 . Whether the liquid crystal display, if there is no output display, mostly output tube is bad, need to replace the circuit board.
　　 3 . Loss of calibration value. Due to the failure of the E2PROM , the calibration data of the meter will be lost and no output current will be caused, and the current will remain unchanged. Solution: The data recovery operation can be used. If it does not work, you can first set the data in the password 2000 , and then set the data in the password 4011 , by manually pushing the pointer to calibrate the data from RP to 100% .
V. No live display
　　 1 . Check the wiring is correct.
　　 2 . Check if the power supply is correct.
　　 3 . Reinstall the LCD module and check for false contacts.
　　 4 . For the multi-wire power supply mode, check whether the 12 and 13 terminals are connected to the ammeter or short circuit.
Six, on-site LCD display 0 or full scale
　　 1 . Check the 2000 password set range, zero parameters. SPAN ZERO to claim less than the value of the two values can not be equal.
　　 2 . Check whether the sampling data comes up. Push the pointer by hand to see the change of the sampling value. If there is no change, the circuit sampling circuit is generally faulty and the circuit board needs to be replaced.
Seven, the alarm is incorrect
　 1 . Check deviation setting d cannot be too large.
　 2 . In the FUN function, the logic function is correct. HA-A indicates the upper bound positive logic. LA-A means lower limit positive logic.
　 3 . Check the alarm value setting in the SU .
　 4 . If the LCD bar code indicates correct and the output does not operate, check that the negative pole of the external power supply and external power supply is connected to the negative pole of the meter's power supply.
　 5 . The board is faulty. Replace the circuit board.
Eight, the cumulative pulse output is incorrect
　 1 . Check whether the alarm value of the selected cumulative pulse output is set to zero.
　 2 . The board is faulty. Replace the circuit board.
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