How to do vortex flowmeter failure, vortex flowmeter troubleshooting
Vortex flowmeter troubleshooting
There are many detection methods for vortex flowmeters, and the difference between sensors and measurement circuits is also large. However, common faults of instruments have commonality. Several instrument faults and countermeasures are shown in the table.
Common troubleshooting of vortex flowmeters in use
1: Vortex flowmeter in the absence of medium flow, there are field display or signal output. Main reasons: poor grounding, causing electromagnetic interference; high-frequency interference of high-power equipment; excessive vibration of the pipeline; too high sensitivity of the converter design
2: After the vortex flowmeter is energized, there is medium flowing, but there is no on-site display or signal output. Main reason: the flowmeter hardware is faulty, such as the power supply line is not connected, the amplification board is damaged, etc.; the pipeline is blocked; the actual flow value is too small, Run below the lower limit of the flowmeter
3: The output signal of the vortex flowmeter is unstable, and the jump is very large. The main reason is: sensor hardware failure; strong electrical interference; pulsating flow or two-phase flow in the medium; the vibration of the pipeline; the gasket protrudes into the tube; The installed valve has interference; the medium is not filled with the pipeline; there is cavitation in the pipeline; the flowmeter is entangled in the body
4: The error of the vortex flowmeter measurement is relatively large. The main reason is: the instrument hardware is faulty; the length of the straight pipe before and after is insufficient; the fluctuation of the power supply voltage is relatively large; the flowmeter is installed differently from the pipeline, or the gasket protrudes into the pipeline; The difference from the inner diameter of the pipe is too large; there is a two-phase flow or a pulsating flow of the medium; the pipe has a leak
5: Vortex flowmeter measuring tube leakage main cause: the pressure inside the pipe is too high; the nominal pressure is not selected correctly; the seal is damaged; the sensor has been corroded
6: The vortex flowmeter sensor sends an abnormal whistling sound. The main reason is that the medium flow rate is too fast, causing the flowmeter to vibrate strongly; the medium in the pipeline has cavitation; the flowmeter is loose.
Hydraulic Support System Seals
Hydraulic support seal
The seal of the Saifu lever hydraulic support is composed of a sealing ring, a retaining ring, a guide ring and a dustproof ring.
Sealing ring:Prevent leaks. Used in the category of hydraulic supports: drum ring, composite seal, mountain ring, bud ring, O-ring, etc. Generally rubber, polyurethane material.
Used together with the sealing ring, it has the functions of anti-crowding, guiding and reducing wear. It is generally made of phenolic XII cloth, 45% copper powder mixed with filled PTFE and other materials.
Guide ring:
It is a part used on the jack piston or piston rod to support the movement of the piston or piston rod. It can prevent the piston or piston rod from direct contact and friction with the cylinder during the movement, and protect the cylinder and the piston or piston. The rod is not damaged. Generally, it is polyoxymethylene, polytetrafluoroethylene and other materials.
Dust-proof ring: the main function is to go out and reciprocate the piston rod to expose the impurities attached to the outer surface of the cylinder, so as to prevent impurities such as external dust from entering the inside of the sealing mechanism. Generally rubber, polyurethane and other materials.
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