The science of, or a system of, weights and measures; also, a treatise on the subject.
refers to EC norm testing concerning repeatability of results of any device. The CATEX+ metrology testing is to EN 50054, EN 50057 and EN 50058. EN 50054 covers the general principles and the methods for testing electrical instruments for the detection and measurement of flammable gases. The standards EN 50057 and EN 50058 cover the performance requirements for instruments belonging to Group II (with a measurement range up to 100% of the LEL scale and up to 100% of the volume gas scale).
The scientific study of weights & measures.