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.

再者，目前很多厂家都用少量的涂胶方法对执行器的防护，我们权且不谈目前大局部厂家所运用的胶是多孔胶（譬如704胶），基本防不住空气中水分和氧气的进入。就从涂胶的效果来看，由于存在其不平均性等要素，这种办法也是防不住空气中水分和氧气的进入的。一旦有空气中水分和氧气进入执行器内部，其内的金属（铜件和铁件）件就会被腐蚀生锈，从而影响执行器的正常工作。对防护而言，做不好的防护还不如不做，假如不做，遇到枯燥的气候，被防护的器件四周还能够是枯燥的（

Moreover, at present, many manufacturers use a small amount of glue coating method to protect the actuator. We can not say that most of the glue used by manufacturers is porous glue (such as 704 glue), which can not basically prevent moisture and oxygen from entering the air. From the effect of glue coating, because of its inequality and other factors, this method can not prevent moisture and oxygen from entering the air. Once moisture and oxygen in the air enter the actuator, the metal (copper and iron) parts will be corroded and rusted, thus affecting the normal operation of the actuator. As far as protection is concerned, it's better not to do bad protection. If not, in the face of dry climate, the device protected around can also be boring. http://www.sdlyxqyb.com/