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1.安装和使用pH计的要点是什么? 答:pH计使用的电极是玻璃电极和甘汞电极。首先在化学和物理上保持电极的完好和清洁才能得到正确的起电势。另外玻璃电极的阻抗很高,约在1000MΩ左右,所以要求二次测量仪表具有很高的输入阻抗,而玻璃电极使用的导线也必须是高绝缘的,否则会产生测量误差。由于阻抗高,容易受到外界的干扰。因此,综合以上所讲:①保持电极的完好和清洁、②保持高绝缘、③做到不易受外界干扰,这三点是使用和安装pH计的关键。
1. What is the point of installing and using the pH meter? A: The pH meter uses the glass electrode and the calomel electrode. First of all, to maintain the electrode intact and clean chemically and physically in order to get the correct potential. In addition, the resistance of the glass electrode is very high, about 1000MΩ, so the secondary measuring instrument is required to have a high input impedance. The lead wire used for the glass electrode must also be highly insulated, otherwise the measurement error may occur. Due to high impedance, susceptible to interference from the outside world. Therefore, to sum up the above said: ① keep the electrode intact and clean, ② maintain high insulation, ③ do not easily subject to external interference, these three points is the key to use and install the pH meter.