GB/T 18522.5-2002

This standard specifies the permissible environmental and operational conditions (such as temperature, humidity, and vibration) that hydrometric instruments must withstand, along with the corresponding test methods to verify their performance under these influences. It is applied in the design, manufacturing, and quality inspection of instruments used for measuring water level, flow, and other hydrological parameters in rivers, lakes, and reservoirs. The standard ensures the reliability and accuracy of these instruments when deployed in diverse field conditions.