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PHG—21B酸度计是化工企业较普遍使用的一种分析仪器,现将我们使用中的几个问题做一简介。一、仪表量程的更改我厂酸度计用于硝铵车间中和岗位,由于已购置的几台酸度计量程是2～10pH,而中和岗位工艺控制指标在pH 2以下,这样表就指示不出中和器的酸度变化,难以用于调节。我们将2—10单量程的表,改为双量程7—0 pH、7—14pH。方法是:将酸度计电路R26的阻值由原来的5.1K改为510Ω,使流经电阻R26上的电流由原来的3 mA
PHG-21B acid meter is a more commonly used chemical companies an analytical instrument, now we use a few questions to do a brief introduction. First, the changes in the range of the instrument I plant pH meter for ammonium nitrate workshop and post, due to the purchase of several acidity measuring range is 2 ~ 10pH, and job control in the post position below pH 2, so the table instructions do not The acidity of the neutralizer varies and is difficult to adjust. We will be 2-10 single-range table, double range 7-0 pH, 7-14pH. Method is: the acidity meter R26 resistance from the original 5.1K to 510Ω, so that the current flowing through the resistor R26 from the original 3 mA