WR flame-proof Thermocouple Series and
WZ flame-proof Thermal Resistance Series
　　Flame-proof thermocouple and thermal resistance for industry are heat sensors and widely used in automation system in chemical industry.
　　 Temperature parameters of the objects under control can be changed into electronic signals by heat sensors and carried to indicator, memory instrument or regulator, so the objects can be checked, regulated and controlled.
They are used in chemical factories where usually various inflammable and explosive gases and steams are accompanied at worksite, suitable to environment inside which are explosive dangerous gases in the temperature span of d II BT4.
The flame-proof thermocouple series are up to the standard of 2BN11002-87 for industrial technology terms of thermocouple and ZBY300-85 for industrial technology terms of thermocouple and ZBY301-85 industrial platinum electronic technology. They are both up to the standard of GB3836.1-83 and GB3836.2-83 of general requirements for flame-proof electrical equipments and examined and approved by the State. Their certificate numbers are GYB91106 GYB91107