This Standard specifies the terms, safety requirements, construction, safety, equipment, marking and Tests of gas burners without fan without flame supervision devices under constant supervision (for example in classrooms and laboratories) with gases according to DVGW-Arbeitsblatt G 260 where the maximum operating pressure does not exceed 20 mbar for natural gas and 50 mbar for liquid gas the catergories I2E, I2ELL, I3B/P, II2E3B/P und II2ELL3B/P nach DIN EN 437, that have a nominal heat Input not exceeding 3kW. Hereafter refered to as laboratory burners. This Standard does not apply for laboratory burners with cartridges according to DIN EN 521.