G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 37/00 (2006.01) G01N 27/409 (2006.01) G01N 27/413 (2006.01) G01N 27/416 (2006.01) G01N 33/18 (2006.01)
Patent
CA 2131318
2131318 9318394 PCTABS00025 The invention relates to 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 in particular the invention relates to a method for 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 respons time constant tc of the obtained measurement curve with the help of the following main equation (1): tcdy/dt=-y+.alpha.0+.alpha.1t wherein t=time (time), tc=probe response time constant (time), y=substrate probe signal (mass volume-1), .alpha.o=substrate concentration at start of response (mass volume-1), .alpha.1=rate of change of substrate concentration (mass volume-1 time-1), and (c) comparing the calculated tc-values of at least two different measurements with each other and - in case the calculated tc- values do not match - calibrating the probe.
Ecotechniek B.v.
Mccarthy Tetrault Llp
LandOfFree
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