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为了便于对普通酸度(pH)计指示器进行检定,我们在党组织的直接领导下,经过集体共同努力制成两个检定装置。经过测试,数据表明可分别用来检定0.1级和0.5级的 pH 计指示器。这两套装置同酸度计检定规程(JJG 119—73)规定的使用0.05%直流电位差计相比较,价格低,体积小,重量轻,操作也较简便。通过两三年的使用,主要是用在下厂巡检工作中,表现了一定的优越性。检定装置的工作原理,如图1方框图所示。pH 转换器将 pH值对应的电动势毫伏值,以0.01pH 为间隔的 pH 值表示出来。而转换器 1pH 所对应的毫伏值(例如25℃时为59.157毫伏(pH)是用工业型便携式直流电位差计标定的。即工作时先对 pH 转换器的工作电流进行调整后,再着手检定 pH 计指示器。一、0.1级 pH 计指示器检定装置本装置的 pH 转换器采用了代换式线路,如图2所示。第一读数盘 A,是由开关 K_A(1×8)和7只测量电阻 R_I 组成的分压线路。每步进跨接1只 R_I,对
In order to facilitate the verification of ordinary acidity (pH) meter indicator, under the direct leadership of the party organizations, we made two verification devices through collective efforts. Tested, the data show that can be used to test 0.1 and 0.5 level pH meter indicator. These two devices are less expensive, smaller, lighter and easier to operate than the 0.05% DC Potentiometer as specified in the Acidimeter Verification Protocol (JJG 119-73). Through two or three years of use, mainly used in the next factory inspection work, showed some superiority. Verify the working principle of the device, as shown in the block diagram of Figure 1. The pH converter shows the pH value corresponding to the electromotive force millivolt value at 0.01 pH intervals. The millivolt value corresponding to converter 1pH (for example, 59.157 millivolts (pH) at 25 ° C) is calibrated with an industrial portable DC potentiometer, which means that after adjusting the operating current of the pH converter Proceed with the test pH meter indicator. A 0.1-level pH meter indicator calibration device The pH converter of the device uses a substitution line, shown in Figure 2. The first reading plate A, by the switch K_A (1 × 8 ) And 7 measuring resistor R_I composed of the partial pressure of the circuit. Each step across a connection R_I, right