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Apparatus for Measurement of Electrically Active Impurities in Liquids

IP.com Disclosure Number: IPCOM000045313D
Original Publication Date: 1983-Mar-01
Included in the Prior Art Database: 2005-Feb-06
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Kanazawa, KK: AUTHOR [+3]

Abstract

The apparatus for measurement of electrically-active impurities in liquids is composed of two parts: the probe and the readout. The probe is made up of three coplanar electrodes supported by a jig. TEFLON Trademark of E.I. du Pont de Nemours & Co.) The center probe is a thin-walled stainless steel sheath, which contains a thin chromel-alumel thermocouple that is electrically insulated from the sheath but in good thermal contact. The outside probes are gold-coated copper. The probe can be reproducibly inserted into a glass bulb containing the liquid tested such that the immersion level of the probes is always the same.

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Apparatus for Measurement of Electrically Active Impurities in Liquids

The apparatus for measurement of electrically-active impurities in liquids is composed of two parts: the probe and the readout. The probe is made up of three coplanar electrodes supported by a jig. TEFLON Trademark of E.I. du Pont de Nemours & Co.) The center probe is a thin-walled stainless steel sheath, which contains a thin chromel-alumel thermocouple that is electrically insulated from the sheath but in good thermal contact. The outside probes are gold-coated copper. The probe can be reproducibly inserted into a glass bulb containing the liquid tested such that the immersion level of the probes is always the same. The probe has been designed with the following guidelines: (1) In-situ temperature measurement; this is very important because the electrical conductivity of the liquid depends critically on the liquid temperature in the neighborhood of the electrodes; hence, at least one of the electrodes should also be a thermocouple to monitor the temperature of the liquid film next to the electrode. (2) Easy cleaning; slight contamination of the liquid (in the ppm level) may change the conductivity significantly, and so the electrodes must be easily cleanable for meaningful repetitive measurements; the present planar pin-electrodes configuration is much better than plate-electrodes configuration in this respect.
(3) Corrosion-resistance and non-contaminating; only highly corrosion-resistant m...