目 录
1 范围 ········，·················································································…… (1)
2 概述 ·······..·················································································…… (1)
3 计量性能要求 ·····································】········································…… (1)
3.1 测量范围 ·················································································…… (1)
3.2 示值误差 ·················································································…… (1)
4 通用技术要求 ··············································································…… (2)
4.1 普通电动通风干湿表 ·························。········································…… (2)
4.2 数显电动通风千湿表 ·..............................................................I........ (2)
4.3 绝缘电阻 ········。········································································…… (2)
5 计量器具控制 ··············································································…… (2)
5.1 检定条件 ········································，········································…… (2)
5.2 检定项目 ·················································································…… (3)
5.3 检定方法 ·················································································…… (3)
5.4 检定结果的处理 ········································································…… (5)
5.5 检定周期 ·················································································…… (5)
附录A 干湿表A值的计算 ·······························································…… (6)
附录B 电动通风干湿表温度检定记录格式·············································…… (7)
附录C 电动通风干湿表湿度检定记录格式·············································…… (8)
附录D 检定证书及检定结果通知书内页格式··········································…… (9)
电动通风干湿表检定规程
范围
本规程适用于电动通风干湿表 (以下简称干湿表)的首次检定、后续检定和使用中
检验 。
电动通风干湿表包括数字显示通风干湿表和不带数字显示的普通电动通风干湿表两
种类型;干湿球温度计亦有玻璃水银温度计和铂电阻温度计两种类型。
2 概 述
普通电动通风干湿表由两支温度计、通风器、上水杯和防辐射护管等组成。数显电
动通风干湿表还包括温度测量、湿度值计算和温湿度显示等部分。其原理框图如图1所
不 。
一冬}u: rx0}t immr;i一 it M,一 9Rm%1h
干湿表的工作原理是在恒定的通风速度下，空气流经干湿球温度计表面，由于湿球
表面水分汽化使湿球温度降低，其值等于湿球温度。经干湿球温度计测出干湿球温度
后，按干湿表方程计算出湿度值。
3 计量性能要求
3.1 测量范围
温度范围:0一50℃;相对湿度范围:10%RH一99%RHa
3.2 示值误差
干湿表按相对湿度示值误差分为湿度二级标准器和湿度工作级标准器。
