At present, many manufacturers encapsulate their circuit boards in a plastic box by gluing, while the batteries are "waterproof batteries" and the actuators are sealed with a small amount of glue in order to solve the problem that the practice of intelligent water meters is in dim and wet environment. Apparently, it seems to have dealt with the protection of intelligent water meters, but in fact, it's just a cover-up for stealing the bell. The reasons are as follows:

首先，用灌胶的办法将电路板封装起来，外表上来看，仿佛是处理了对电路板的防护。但是，细致的研讨能够得出结论：这种灌胶的办法对电路板而言只是短期的，由于，随着时间的推移，空气中的水分和氧分子会从与电路板相连的信号线（该类信号线多为多股绞股线）的绞股中间的间隙进入电路板（本处还未列出有些厂家用硬胶灌封时形成的与塑料件之间的伸缩缝）；另外，空气中的氧气会腐蚀电路板的金属（包括电路板上PCB的附铜线等），空气中的湿润水分会使电路板上某些器件（譬如电容和电池等）漏电。

Firstly, the circuit board is encapsulated by glue filling, which seems to be dealing with the protection of the circuit board. However, careful study can conclude that this method of glue filling is only short-term for PCB, because over time, moisture and oxygen molecules in the air will enter the circuit board from the gap between the strands connected to the circuit board (which are mostly multi-stranded strands). List the expansion joints between plastic parts and hard glue from some manufacturers. In addition, oxygen in the air will corrode the metal of PCB (including copper wires attached to PCB on PCB) and moisture in the air will cause leakage of some devices (such as capacitors and batteries) on PCB.

其次，电池采用防水电池，外表上看来，也算是处理了电池的防水，但是殊不知，为了换电池而采用的衔接处依然是有漏电的破绽的（有的厂家痛快不再设置改换电池衔接线，直接将电池连线与电路板衔接，试问：这怎样换电池？），所以目前的智能水表的电池防护是不合格的。

Secondly, water-proof batteries are used in batteries, which are also treated as water-proof batteries in appearance, but it is unknown that there is still a leak in the junction used for battery replacement (some manufacturers are happy to stop setting the replacement battery connection line and connect the battery connection with the circuit board directly. How to change the electricity? Pool? Therefore, the current battery protection of smart water meters is not qualified.