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| Metrological verification of PHSJ series laboratory pH meter |
| Hu Fan1, Wang Lingzhen1, Liu Ying2, Shen Zhen1, Yang Hengxiang1, Zou Chao1 |
1. Jiangsu Meteorological Observation Center,Nanjing 210041;
2. Heilongjiang Meteorological Data Center,Harbin 150030 |
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Abstract This paper uses pHC-1D intelligent pH meter verification instrument to verify the PHSJ series laboratory pH meter used by our department.In order to better carry out the measurement of laboratory pH meter,according to the requirements of JJG119-2018 Verification Regulation of Laboratory pH Meters,and based on the structure and working principle of laboratory pH meter,this paper summarizes the indicating errors of pH and mV,the indicating errors caused by the input impedance of the pH meter,the indicating errors caused by the temperature compensation of the pH meter,the indicating repeatability of the pH meter and the verification process of the input current.
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Received: 29 September 2021
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2022, Vol. 39 
