Kalmomin "thermowell" da "bututun kariya" ana amfani da su sosai wajen auna zafin masana'antu da sarrafawa. Ko da yake amfaninsu yana kama da juna, akwai wasu bambance-bambance tsakanin su biyun:

Thermowell:
Thermowell bututu ne mai rufewa da aka sanya a cikin jirgin ruwa mai sarrafawa ko bututu don kare firikwensin zafin jiki, kamar na'urar gano yanayin zafi ko juriya (RTD), daga ruwan da ake sarrafawa. Thermowells suna ba da damar shigar da na'urori masu auna zafin jiki a cikin tsari yayin samar da shingen da ke kare firikwensin daga yanayin lalacewa, abrasive, ko matsanancin matsa lamba na ruwan tsari. Thermowells an ƙera su don ware firikwensin zafin jiki daga yanayin tsari yayin ba da izinin ma'aunin zafin jiki daidai.

Bututun kariya:
Bututun kariya, a daya bangaren, bututu ne ko kwasfa da ke yin irin wannan manufa ga ma'aunin zafi da sanyio. Ana amfani da shi don kare na'urori masu auna zafin jiki daga yanayin aiki mai tsauri, kamar yanayin zafi mai zafi, gurɓataccen yanayi ko abrasives. Ana amfani da bututun kariya galibi a aikace-aikace inda bayyanar firikwensin zafin jiki kai tsaye zuwa yanayin tsari na iya haifar da lalacewar firikwensin ko rashin ingantaccen karatun zafin jiki.

Don taƙaitawa, yayin da ake amfani da ma'aunin zafi da sanyio da bututun kariya don kare na'urori masu auna zafin jiki, yawanci ana tsara thermowells tare da rufaffiyar iyakar kuma a sanya su cikin kwantena ko bututu, yayin da bututun kariya sun fi dacewa kuma ana iya amfani da su a aikace-aikace iri-iri. An saita don kare firikwensin zafin jiki daga mummuna yanayi.