How to Analyze and Deal with Common Troubles in Metal Tube Float Flowmeters

Metal tube float flowmeter is a kind of variable area flow measuring instrument commonly used in industrial automation process control. It has the characteristics of small size, large detection range and easy use. It can be used to measure the flow of liquids, gases, and steam. It is especially suitable for measuring medium flow at low flow rates and small flows. In the process of use, we often encounter the phenomenon of ineffective instructions, how to solve these uncomplicated problems, the following is a brief analysis for everyone:

Specific phenomenon 1 : The actual flow rate and the indicated value are inconsistent
Cause of failure: Due to corrosion, float flow, volume, maximum diameter change; diameter of tapered tube inner diameter changes
Solution: Change the corrosion resistant material. If the size of the float is the same as before the exchange, it can be converted or recalibrated according to the new weight, density; if the size is also different, it must be recalibrated. The maximum cylindrical surface of the float wears and the surface is rough. When the measured value is affected, replace the new rotor. Floats made of engineering plastics or linings, which may swell, change in maximum diameter and volume, and change to floats of suitable materials
 
Specific phenomenon 2 : The actual flow rate and the indicated value are inconsistent
Cause of failure: Floater, conical tube attached to dirt and other foreign body layer
Solution: Cleaning, to prevent damage to the inner surface of the conical tube and the maximum diameter cylindrical surface of the float, to maintain the original surface roughness
 
Specific phenomenon 3 : The actual flow rate and the indicated value are inconsistent
Cause of failure: gas, steam, compressive fluid temperature and pressure changes
The solution: According to the new conditions for conversion correction
 
Specific phenomenon 4 : The actual flow rate and the indicated value are inconsistent
Cause of the fault: fluid pulsation, rapid change in gas pressure, fluctuation in indicator value
Solution: Install a buffer tank, or switch to a damped mechanism
 
Specific phenomenon 5 : The actual flow rate and the indicated value are inconsistent
Cause of failure: There are bubbles in the liquid, and the liquid is mixed with droplets
Solution: Eliminate air bubbles or droplets
 
Specific phenomenon 6 : The actual flow rate and the indicated value are inconsistent
Cause of failure: When used in liquids, the internal dead space of the instrument is retained to affect the buoyancy of the floater.
Solution: Significant influence on low flow meter and operation at low flow rate, eliminate gas
 
Specific phenomenon 7 : Metal tube float flow meter flow changes while the float or pointer moves late
Cause of failure: There is foreign matter such as particles between the float and the guide shaft or the guide shaft bends, etc.
Solution: Dismantling cleaning, removing foreign matter or fixing layer, straightening the guide shaft, most of the guide shaft bending is due to the rapid opening and closing of the solenoid valve, and the rise of the float due to the sudden rise of the float.
 
Specific phenomenon 8 : Flow changes while the float or pointer moves late
Cause of failure: Attaching iron powder or particles around magnets with magnetic coupling float assembly indicates that some connecting rods or pointers are stuck
Solution: Remove and remove, and use the bypass pipe to fully clean the pipeline during the initial operation. In the front of the instrument, a filter is manually connected to the magnet to connect the moving link, and the stuck part is adjusted. Check whether there is foreign matter between the rotating shaft and the bearing to block the movement and remove or replace the parts
 
Specific phenomenon 9 : Flow changes while the float or pointer moves late
Cause of failure: Engineering plastic floats and tapered tube liners swell, or thermally expand and get stuck
Solution: Replace corrosion resistant material parts. Higher temperature media try not to use plastic, use corrosion-resistant metal parts instead
 
Specific phenomenon 10 : Flow changes while the float or pointer moves late
Cause of the fault: The magnetism of the magnetically coupled magnet decreases
Solution: Remove the meter, move the float up and down by hand, and confirm that the indicator part of the indicator part moves smoothly; if it does not follow or follow the instability, replace the part or magnetize it. To prevent magnetic weakening, prohibit the two coupling pieces from striking each other
 

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