Why is there an error in the water meter? One article teaches you to solve the water meter error
Is there a big difference in monthly water bills? Excluding abnormal water use, it is very likely that there is a problem with your water meter. Why is there an error in water meter measurement? How to solve the water meter error? Next, we will learn more about the causes and solutions of water meter errors.
What are the reasons for the error of the water meter?
Reason 1: The quality of the water meter itself
The reason for the error of many water meters is the water meter itself. Some water meters are not water meters produced by regular manufacturers, and the accessories of the water meter are not qualified, which will lead to the measurement error of the water meter; Correction, and even some verification devices themselves are not qualified, which will also lead to errors in water meter measurement; in addition, the accuracy of many old-fashioned A-level meters is not enough, which will also cause water meter measurement errors.
Reason 2: The problem of water meter overdue
Like many commodities, the water meter has a shelf life. Due to the harsh working environment of the water meter, it should be regularly checked and replaced when it is in use.
First of all, when the water meter is in use, the impeller rotates and the tip is frequently rubbed, and the tip is an important part in the water meter that supports the rotation of the impeller, causing wear on the tip. First, the frictional resistance between the tip and the impeller increases, and the metering of the water meter is negative; It is because the position of the impeller drops, the distance between the impeller and the impeller box increases, the resistance decreases, and the metering of the water meter is positive;
Secondly, when the water meter is used, due to the non-uniformity of water distribution in the water meter, the flow through the oblique water inlet side of the impeller box is greater than the water inlet flow at the outlet side of the water meter. The side of the nozzle is inclined, so that the edge of the impeller is close to the inner wall of the impeller box, and the resistance increases. At the same time, the diameter of the impeller is reduced, the impact moment of the water on the impeller becomes smaller, and the metering of the water meter is negative; the second is the upper middle shaft of the impeller and the upper splint shaft The sleeve is inclined towards the water outlet of the water meter, the upper splint bushing is frequently rubbed and ground into an oval shape, the central axis of the impeller is offset, and wear occurs between the impeller shaft and the gear box, resulting in increased resistance, and the metering of the water meter is also negative.
Whether the measurement value is negative or positive, certain measurement errors will occur.
Reason 3: The problem of water meter selection
When some users choose the diameter of the water meter, they do not choose the model of the water meter reasonably according to the changing law of water consumption and without hydraulic calculation, resulting in some models with a large diameter of the water meter, and the water flow rate is lower than the minimum flow specified by the water meter when the water consumption is low. Make the water meter measurement negative; some models have a small diameter in the water meter. In most of the time when the water is used, the water flow rate is greater than the rated flow rate specified by the water meter. Long-term operation will cause mechanical wear of the water meter components, which will also cause the water meter to measure. error occurs.
Reason 4: Design and installation problems
According to the verification regulations, the water meter must be installed on the straight line of the pipeline. The length of the straight pipe section on the inlet side of the water meter shall not be less than 10 times the diameter of the water meter, and the length of the straight pipe on the outlet side shall not be less than 5 times the diameter of the water meter. Otherwise, it is easy to produce torrent and eddy current, which will cause the measurement deviation of the water meter.
If the water meter is installed inclined, the resistance between the impeller shaft and the upper splint bushing, the tip and the impeller bushing, the gear shaft and the splint will increase, and sometimes there will be gear meshing phenomenon, which will cause the water meter to be negatively measured.
When installing the water meter, try to avoid installing the water meter on the vibration belt. For example, installing the water meter in a place with strong vibration such as sidewalks and motor vehicle lanes will cause the water meter to be damaged or the water meter gears to be loose and dislocated, thus affecting the measurement accuracy.
Reason five: water quality problems in the pipeline network
Why does the water meter go so fast?
If the quality of the pipe is not good, there are debris, debris left in the installation or the water quality itself. When the debris blocks part of the water inlet, when the flow rate is constant, the water flow rate through the water meter increases, and the metering of the water meter is biased.
Why is the water meter running slowly?
When the sundries pass through the water meter filter, it is easy to cause the water meter impeller to be entangled and squeezed, causing the impeller and the gear to be separated or stuck, and the metering of the water meter is negative.
Reason 6: The influence of air in water
Air is often mixed in after plumbing repairs. On the one hand, most of the air remaining in the water meter stays in the upper part. When it is discharged out of the water meter with water, the capacity indicated by the pointer of the water meter is often larger than the actual displacement; The counterattack effect of water is significantly weakened, and the metering of the water meter is positive.
Reason 7: Problems with the valve in front of the watch
When the water meter is in use, the valves in front of the meter are not fully opened, and sometimes the valve in front of the meter is used to adjust the flow of the water meter, resulting in the deviation of the indicated value of the water meter.