标定方法、清洗保存与寿命判断，降低现场维护成本。Calibration, cleaning, storage and end-of-life judgement to cut site maintenance cost.
pH 测量不准，八成问题出在电极而不是变送器。本文讲清玻璃电极的测量原理、两点标定的判断标准、清洗与保存方法，以及寿命到期的判断依据。When pH measurement is wrong, eight times out of ten the electrode is the cause, not the transmitter. This article explains the glass-electrode principle, the acceptance criteria for two-point calibration, cleaning and storage, and how to tell when an electrode is at end of life.