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Browse Prior Art Database

Periodic Sampling pH Monitor

IP.com Disclosure Number: IPCOM000094068D
Original Publication Date: 1966-May-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Miller, DP: AUTHOR

Abstract

A small pH sampling chamber having multiple inlets and a common outlet, each electrically controlled, permits frequent, automatic and accurate inspection of the pH value of chemical solutions.

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Periodic Sampling pH Monitor

A small pH sampling chamber having multiple inlets and a common outlet, each electrically controlled, permits frequent, automatic and accurate inspection of the pH value of chemical solutions.

Sampling chamber 1 is formed in block 2 of inert material that is also fitted to receive thermocompensator 3, reference electrode 4 and glass electrode 5. The chamber is provided with three inlet ducts 6 and outlet duct 7 of flexible tubing. The ducts are controlled by electromagnetically-operated valves 8 each actuated upon a signal from sequence timer 9 to open a duct.

In operation, an inlet duct is connected to the solution to be sampled, deionized water, ad buffer standardizing liquid, and the outlet duct is connected with a drain. The timer is set to open and close the inlet and outlet ducts in the desired sequence such as sample rinse for 30 seconds, sample read for 150 seconds, deionized water rinse for 60 seconds, deionized water hold for 60 seconds and then switch the system off for a predetermined time.

A buffer sequence can be substituted for the sample sequence for calibration. Readings of the pH value can be taken at meter 10, coupled to the electrodes.

This apparatus permits the sampling of pH values in electroless plating solutions that could not heretofore be monitored by the continuous flow-through method. This is because of deposits on the electrodes from prolonged immersion.

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