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

为保证隔膜使用可靠性和安全性，应同用途选择合适密液。

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

对于在外壳内充液，能够抗工作环境振动较强和减少介质压力脉动影响。