System for calibrating, monitoring and reporting the status of a

Details System for calibrating, monitoring and reporting the status of a System for calibrating, monitoring and reporting the status of a

1990-12-10

1991-09-03

Teska, Kevin J.

Boots, shoes, and leggings

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

Patent

active

050460285

ABSTRACT:
A device for use in a system for providing on-line, real-time monitoring of the condition of a sensor immersed in a process solution, the sensor having a membrane, by periodically generating known changes in characteristics of the process solution adjacent the membrane, the device providing a fixed volume of the process solution adjacent the membrane, the fixed volume being independent of a flow rate of the process solution. The device include a shield of non-conductive material, and having a retracted position permitting flow of the process solution past membrane, and an extended position enclosing the membrane to provide a fixed, stationary volume of process solution adjacent said membrane. The shield is selectively moved from its retracted position to its extended position during monitoring of the condition of the sensor.

REFERENCES:
patent: 4109505 (1978-08-01), Clark et al.
patent: 4285792 (1981-08-01), McGandy
patent: 4288308 (1981-09-01), Hach
patent: 4447775 (1984-05-01), Breuker et al.
patent: 4650562 (1987-03-01), Harman, III et al.
patent: 4686011 (1987-08-01), Jackle
patent: 4713618 (1981-12-01), Carlson et al.
patent: 4777444 (1988-10-01), Beijk et al.
patent: 4800513 (1989-01-01), Deutsch
patent: 4961163 (1990-10-01), Bryan et al.

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