Sensors and Severe Conditions

　　Sensors and Severe Conditions

　　传感器在极端条件下使用，尽管恶劣的环境下，它们被要求进行精确的测量。一般来说，恶劣的环境包括极端的温度、压力、冲击、辐射以及化学腐蚀性液体和气体的存在。

　　在这些不友好的条件下，主要的目标和挑战是把传感器放在足够接近被测量的地方，以达到高度的精确性和可靠性。其他关键的考虑因素是传感器的材料，温度，压力，或冲击，每个传感器可以操作，以及什么故障率存在极端暴露的结果。与更为良性的传感器相比，这些传感器在更换、维护和系统停机时间方面具有很高的潜在成本。

　　The key question， then， is how can sensors be protected as they inch closer to the target to be measured？ Often it is sealed packaging that enables sensors to deal with harsh conditions. For example， U.S. Sensor‘s NTC Thermistors （Figure 1） are radial leaded and glass encapsulated to provide long-term reliability and fast response time. Hermetic construction allows them to withstand severe conditions such as temperatures up to 300°C. These sensors are designed for use in industrial， consumer， HVAC， and telecom applications.