GB/T 27993-2011

Professionals in hydrology, water conservancy, and environmental monitoring use this standard to design and manufacture stage measuring instruments. They rely on it to ensure accuracy and reliability when measuring water levels in rivers, lakes, and reservoirs. This standard is important because it unifies technical requirements and test methods, ensuring comparability and validity of hydrological data.

水文监测、水利工程、环境保护等领域的专业人员使用本标准来设计和生产水位测量仪器。他们依据本标准确保仪器在测量江河、湖泊、水库等水体水位时的准确性和可靠性。本标准的重要性在于统一了水位测量仪器的技术要求和测试方法，保障了水文数据的可比性和有效性。

This standard specifies product classification, technical requirements, test methods, inspection rules, and marking/packaging for stage measuring instruments. Instruments are classified by working principle into water gauges, contact, float, pressure, acoustic, radar, laser types, etc., and by recording mode into manual reading, analog, printing, and memory recording. It details key technical indicators such as measuring range, resolution, accuracy grades, sensitivity threshold, hysteresis, and repeatability, along with requirements for working environment, electrical performance, structure, materials, lightning protection, and reliability. It applies to water level measurement in rivers, lakes, canals, and reservoirs, but not to liquid level meters.

本标准规定了水位测量仪器的产品分类、技术要求、试验方法、检验规则及标志包装等。仪器按工作原理分为水尺、接触式、浮子式、压力式、声波式、雷达式等，按记录方式分为人工观读、模拟、打印、存储器记录等。标准详细规定了测量范围、分辨力、准确度等级、灵敏阈、回差、重复性等关键技术指标，以及工作环境条件、电性能、结构、材料、防雷、可靠性等要求。适用于江河、湖泊、渠道、水库等水体水位测量，不适用于液位计。