请问游泳池高手，全新压力表，运行两个星期后有不工作了。

gzm2gzm

游泳池的高手请进。沙过滤得上面有一个压力表。两星期前如图不显示压力。买了一个全新的换上。工作两个星期后有不再显示压力了。刚换上的两个星期都稳定显示压力为８０％在蓝色允许范围内。

这次我仔细观察，开电后，压力指针达到80%，然后慢慢在1分粥内下滑到0，维持不动，水循环还是正常。水也很清。Backwash后没有改变。

压力表型号是： Stainless Steel Oil Filled Filter Pressure Gauge (H457)

请问是压力表的问题还是我系统的问题。

图上绿色点代表我的电　和水循环已经开动。

hutu

我的表早就坏了，但filter、pump都工作正常啊。poolshop的人也说不用管它。

gzm2gzm

是，谢谢，hutu，但是两个问题：
1。我已经买了新表，所以如果是表的问题，我可以免费更换。卖家不再同城，所以要照片来确认。
2。通过压力表，我可以远程了解到池子的情况，我本人不住在那里。因此还是有必要修复这个功能的。

yanmin2k

如果是普通机械式压力表，里面有弹性螺旋管和齿轮机构，注油是为了增加阻尼，防止压力突变时打坏指针。
故障的原因只有打开表才能找到。

gzm2gzm

请问 yanmin2k，从表面症状看，是表的问题还是我系统问题？

gzm2gzm

卖表的人回复：thank you very much for sending the video. this has been seen many many times before. you pressure gauge is not faulty.
In the little diagram below it explains why the gauge ceases to function after about 10 seconds or so of operation if part number 8a which is the air bleeder pipe
which all modern sand filters have becomes blocked then what happens is air is trapped inside the filter and when the pump is turned on initially you will get water \being pumped into the gauge so the gauge will function, but after a very short time 5-15 seconds the trapped air inside the filter ends up at where the gauge is trying to read water pressure so the gauge ceases to function, which will be the same result with a new gauge.  Was the cause of pump failure due to the presence of air in the filtration system as this can cause cavitation in the pump chamber resulting in pump failure。

意思说，沙过滤里面有大量空气。