v.溶解而分离

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适的密封液。

For the meter which has liquate inner, can work in strong vibration or pressure pulse situation. 对于在外壳内充液的仪表，能够抗工作环境振动较强和减少介质压力的脉动影响。

The normal pressure meter is suite measure some liquate,gas,steam medium pressure which has no corruption for copper and steel. 一般压力表适用于测量爆炸危险，不结晶，不凝固及对钢和铜合金不起腐蚀作用的液体、蒸汽和气体等介质的压力。

The glass thermometer is use this principle：the medium(mercury or organic liquate)heat swell，cold contract.Have high precision and stable feature. 破璃温度计是根据感温液(水银或有机液体)热膨胀、冷收缩的原理制成的一种测温仪表，具有测量精度高，反应灵敏，质量稳定可靠的特点。

Keywords measuring by coordination titration;liquate;trioxid alumina; 络合滴定法;熔融;三氧化二铝;