Cixi Changhe Sanhe Metal Enclosure Limited

These thermocouple heads are explosion-proof,because in chemical plant,
 the production site is often accompanied by various kinds of flammable,
explosive chemical gas, steam, if use normal temperature sensor is not safe,
 easy to cause gas explosion. Therefore, Explosion-proof temperature sensor
must be used on these occasions.   http://www.sanhe-enclosure.com