Bimetallic thermometer sheath fracture how to do?

Bimetallic thermometer is very common in industrial equipment, usually in order to convenient installation, we will give it with a same bimetallic thermometer sheath. But in actual use process, occasionally, the phenomenon of the bimetallic thermometer sheath rupture. He met this kind of situation, what should we do? Actually, bimetallic thermometer sheath are made of stainless steel materials, whether it's a sheath or welding sheath, are very strong. Is fracture would happen, generally is the use of the environment pressure than the actual load. So encounter such a situation, we need to confirm the following two questions to find out why, avoid similar situation: 1. Using the environment pressure and double metal thermometer sheath of the maximum load match; 2. Using the environment vibration, vibration in the bimetallic thermometer sheath fatigue damage; So, know the reason of the bimetallic thermometer sheath rupture after, we can suit the remedy to the case, choose suitable for bimetallic thermometer sheath.