在化工厂中,热电阻等测温元件几乎到处皆有,带保护套管的测温元件在测量时,是直接插在被测的流体中,因此,若保护管折断,轻则设备损坏影响生产,重则造成意外的事故.目前大多数设计和使用单位,在选择保护管时,对其强度往往只考虑其能承受的容许压力,忽略了流体的旋涡频率的影响. In chemical plants, thermal resistance and other temperature components are almost everywhere, with the protective sleeve temperature measuring element is measured directly inserted in the measured fluid, so if the protective tube broken, ranging from the impact of equipment damage Production, heavy cause accidents.Most of the design and use of units, the choice of protective tube, its strength often only consider the allowable pressure that it can withstand, ignoring the fluid vortex frequency.