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Method for detecting the need for calibrating probes
Method for detecting the need for calibrating probes
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机译:检测对校准探针的需求的方法
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摘要
An in situ probe failure detection method for probes which deliver an electric signal on account of a change of the concentration of a substance to be measured. An example of such a probe failure may be caused by, for example, fouling of the membrane as the relative change in signal may be interpreted as a change in the concentration of the substance to be measured. More particularly, the method involves detecting the need for calibrating probes, which probes deliver an electric signal on account of a change of the concentration of a substance to be measured, characterized by: (a) subjecting the probe to a stepwise change of the concentration of the substance to be measured; (b) calculating the value of the probe response time constant t.sub.c of the obtained measurement curve with the help of the following main equation (1): t.sub.c dy/dt=-y+&agr;.sub.0 +&agr;.sub.1 t wherein t=time (time) , t.sub.c =probe response time constant (time), y=substrate probe signal (mass volume.sup.-1), &agr;.sub.0 =substrate concentration at start of response (mass volume.sup.-1), &agr;.sub.1 =rate of change of substrate concentration (mass volume.sup.-1 time.sup.-1), and (c) comparing the calculated t.sub.c values of at least two different measurements with each other, and in case the calculated t.sub.c values do not match, calibrating the probe.
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机译:一种用于探针的原位探针故障检测方法,该探针由于待测物质的浓度变化而传送电信号。这种探针故障的一个例子可能是由例如膜的结垢引起的,因为信号的相对变化可以解释为待测物质浓度的变化。更具体地,该方法包括检测对校准探针的需要,该校准探针由于要测量的物质的浓度变化而传送电信号,其特征在于:(a)使该探针经受浓度的逐步变化。被测物质; (b)借助于下面的主要方程式(1)计算所获得的测量曲线的探针响应时间常数tc的值:tc dy / dt = -y +&agr 0 +α1 t,其中t =时间(时间),t c =探针响应时间常数(时间),y =底物探针信号(质量-1),α。 sub.0 =反应开始时的底物浓度(质量体积-1),sub.1 =底物浓度的变化率(质量体积-1时间-1),和(c)将至少两个不同测量值的计算出的tc值相互比较,并在计算出的tc值不匹配的情况下校准探头。
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