GB/T 38615-2020 General specification of ultrasonic levelmeter

GB/T 17212-1998 Industrial-process measurement and control—Terms and definitions GB/T 18271.2-2017 Process measurement and control devices—General methods and procedures for evaluating performance—Part 2:Tests under reference conditions GB/T 18271.3-2017 Process measurement and control devices—General methods and procedures for evaluating performance—Part 3:Tests for the effects of influence quantities GB/T 38620-2020 Methods of evaluating the performance of ultrasonic levelmeter GB/T 2900.56-2002 Electrotechnical terminology—Automatic control GB/T 2900.56-2008 Electrotechnical terminology—Control technology GB 3836.1-2000 Electrical apparatus for explosive gas atmospheres—Part 1:General requirements GB 3836.1-2010 Explosive atmospheres—Part 1:Equipment—General requirements GB/T 3836.1-2021 Explosive atmospheres—Part 1:Equipment—General requirements GB 3836.2-2000 Electrical apparatus for explosive gas atmospheres—Part 2:Flameproof enclosure “d” GB 3836.2-2010 Explosive atmospheres—Part 2:Equipment protection by flameproof enclosures "d" GB/T 3836.2-2021 Explosive atmospheres—Part 2:Equipment protection by flameproof enclosures “d” GB 3836.4-2000 Electrical apparatus for explosive gas atmospheres—Part 4:Intrinsic safety“i” GB 3836.4-2010 Explosive atmospheres—Part 4:Equipment protection by intrinsic safety "i" GB/T 3836.4-2021 Explosive atmospheres—art 4:Equipment protection by intrinsic safety “i” GB 3836.9-1990 Electrical apparatus for explosive atmospheres Encapsulated electrical apparatus "m" GB 3836.9-2006 Electrical apparatus for explosive gas atmospheres—Part 9:Encapsulation "m" GB 3836.9-2014 Explosive atmospheres—Part 9:Equipment protection by type of protection “m” GB/T 3836.9-2021 Explosive atmospheres—Part 9:Equipment protection by encapsulation “m” GB 3836.20-2010 Explosive atmospheres—Part 20:Equipment with equipment protection level (EPL) Ga GB/T 9969-2008 General principles for preparation of instructions for use of industrial products GB 9969.1-1998 General principles for preparation of instructions for use of industrial products GB/T 13384-1992 General specifications for packagings of mechanical and electrical products GB/T 13384-2008 General specifications for packing of mechanical and electrical product GB/T 17614.1-1998 Transmitters for use in industrial-process control systems Part 1:Methods of evaluating the performance GB/T 17614.1-2008 Transmitters for use in industrial-process control systems—Part 1:Methods of evaluating the performance GB/T 17614.1-2015 Transmitters for use in industrial-process control systems—Part 1:Methods for performance evaluation