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| A Calibration Method for Inner Installed On-line Monitoring Instrument of Pure Water Machine |
| ZHANG Yao-qi,REN Yun,LI Ya,HE Jun-bin |
| Hunan Institute of Metrology and Test, Changsha, Hunan 410014, China |
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Abstract To meet with the needs of on-site calibration of monitoring instruments installed in pure water machines, a measurement standard system including high-precision conductivity meter, total organic carbon analyzer and adjustable flow buffer device has been developed.By comparing the indication values of built-in monitoring instruments of pure water machines with the measurement results of the measurement standard system, the on-site calibration of conductivity or resistivity meter and total organic carbon analyzer installed in pure water machines was achieved.The experimental results of eleven pure water machines showed the indication errors of built-in conductivity or resistivity meters ranging from -2.4% to 15% with the expanded uncertainty of 1.7% (k=2) and those of built-in total organic carbon analyzer ranging from -98% to 125% with the expanded uncertainty of 4.8% (k=2).
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Received: 21 June 2019
Published: 19 December 2019
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2020, Vol. 41 
