To protect the security and stable of film meter, should select some kinds right airproof liquate.

为保证隔膜表使用可靠性和安全性，应根据不同用途选择合。

For the meter which has liquate inner, can work in strong vibration or pressure pulse situation.

在外壳内充仪表，能够抗工作环境振动较强和减少介质压力脉动影响。