System for monitoring and reporting the operability and calibrat

Details System for monitoring and reporting the operability and calibrat System for monitoring and reporting the operability and calibrat

1988-12-02

1990-10-02

Teska, Kevin J.

Boots, shoes, and leggings

204401, 204412, 204435, 20415321, 364496, 36457101, G06F 1546, G01N 2726

Patent

active

049611631

ABSTRACT:
In a real time, on-line pH measurement of a process solution, a system provides a continuous data of the physical condition of the pH sensor. The system includes a pH sensor having a glass membrane disposed in the process solution and two electrodes in the solution adjacent the sensor. The two electrodes in the solution are periodically driven by a short time duration dc signal producing a dc current between the two electrodes. This action results in electrolysis ofo the H.sub.2 O molecules of the solution at the two electrodes and a resulting decrease in hydrogen ion concentration (a rise in pH value) in the region of the sensor. The sensor response to the increase in pH in the solution is a direct indicator of the complete sensor and system performance and is monitored and analyzed. Visual readouts and threshold alarm circuits are provided which indicate changes in the sensor response to the pH change indicative of a sensor or system degradation or fault.

REFERENCES:
patent: 4288308 (1981-09-01), Hach
patent: 4297193 (1981-10-01), Brezinski et al.
patent: 4447309 (1984-05-01), Morioka et al.
patent: 4686011 (1987-08-01), Jackle
patent: 4777444 (1988-10-01), Beijk et al.
patent: 4800513 (1989-01-01), Deutsch
patent: 4822456 (1989-04-01), Bryan
patent: 4852385 (1989-08-01), Brinkmann

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