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How to choose a water meter?


Water meter selection principles

Selection principles:

The selection of large-diameter water meters should follow the principle of feature matching, that is, the type characteristics of the water meter must match the water usage conditions and installation conditions, to avoid pursuing the advancement of certain performance or functions while ignoring the matching of application scenarios. In most cases, the cause of metering inaccuracy is not caused by the unqualified metering performance of the water meter itself, but is often caused by the mismatch between the model and the application scenario.

Once any characteristics of the water meter, not limited to measurement characteristics, do not match the application scenario, problems are a high probability event, and often manifest as comprehensive problems. Therefore, it only makes sense to choose a water meter with better measurement performance and richer application functions based on matching characteristics.

Application control of large diameter water meters


To make good use of water meters, model selection is the foundation, control is the key, and installation is the first step in control. Correct and standardized installation is the basis for ensuring accurate water meter measurement and reasonably extending the service life.

Installation must ensure three properties: safety, accuracy and convenience.

Safety means that the installation location must not only ensure the operational safety of the installer, but also ensure the working safety of the water meter. Places such as high altitudes without reliable protection, deep wells where flammable, explosive, toxic and harmful gases accumulate, and places near power facilities with the risk of leakage pose threats to the operational safety of installers, so installation of water meters should be avoided.

Uncontrollable places such as flooding, freezing, high temperatures, lightning strikes, hydraulic shocks, and air accumulation are not conducive to the safe operation of water meters and should be avoided.

Correctness means that the installation of the water meter must comply with both the manufacturer's regulations and the provisions of the General Standard for Water Meter Installation (GB/T 778.5-2018), including (but not limited to), the length, inner diameter and other pipe conditions of the straight pipe sections before and after the water meter. To accurately control, the installation orientation of the water meter must be consistent with the manufacturer's requirements, and operating steps such as pipe cleaning before installation and pipe exhaust after installation must be implemented in a standardized manner.

Convenience means that the installation location and fixation method of the water meter should be convenient for meter reading and maintenance. The installation location should be chosen as far as possible to be suitable for water meter transportation and operation by the installer. It should also be convenient for future meter reading, inspection, maintenance and replacement.

Water meter selection principles

Inspection valves should be installed at the front and rear of the straight pipe sections upstream and downstream of the water meter, and filters should be installed upstream of the front straight pipe section as much as possible to facilitate maintenance.


Effective maintenance is a necessary means to improve the reliability of measurement results and extend the service life of water meters. Water meters will inevitably be affected by factors such as water pollution and environmental erosion during use. Regular maintenance measures such as sewage discharge, cleaning, exhaust, reinforcement, and battery replacement can slow down the expansion of these adverse effects and enable the water meter to continue to work under suitable working conditions.

Regular maintenance can also detect water meter failures or uncontrolled modifications early, and take timely measures to reduce metering losses and avoid the expansion of metering disputes.

Metrological verification:

Maintenance can detect explicit faults or measurement inaccuracies, but it is difficult to detect implicit measurement inaccuracies, which requires measurement verification measures to ensure. The water meter is a measuring instrument that is easy to manufacture but difficult to use. Product quality and standardized use are equally important. This is the logical basis for the necessity of measurement verification.

There are usually two methods for measurement verification. One is to regularly remove the water meter and send it to the laboratory for verification or calibration, and the other is to conduct on-site verification without removing the meter.

Water meter selection principles

A more effective measure is to combine the two methods, through regular verification or calibration to verify that the inherent performance of the water meter is in a qualified state, and through on-site inspection to verify whether the performance of the water meter is qualified under working conditions.

It’s all about the point! Selection and application control of large-diameter water meters

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