High Temperature Device : A device whose maximum operating temperature exceeds 80 percent of the ignition temperature in degrees Celsius (C) of the gas or vapor involved. (RP 14F, RP 550B)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}