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DAVID W. SPITZER'S E-ZINE
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TECHNICAL AND MARKETING SERVICES
FOR INSTRUMENTATION SUPPLIERS AND END-USERS
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Another difficulty with the theoretical foundation for pH measurement is that activity coefficients for particular ionic species do not represent physical reality because the ions do not exist in the solution by themselves.
In order to maintain electrical neutrality, they are accompanied by other ions of opposite sign and these other ions affect their activity.
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NON-CONTACT, level-measurement sensors, such as laser, non-contact radar and ultrasonic technologies, were developed for applications where contacting sensors were seen as problems, either through false readings or high maintenance.
Non-contact sensors are generally located above the material and aren’t directly exposed to the material.
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Despite claims that may seem to the contrary, not all flowmeters are equal.
In particular, not all flowmeters of the same technology are equal.
Further, not all flowmeter models of the same technology made by the same manufacturer are equal.
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ISSN 1538-5280
©2006 Spitzer and Boyes, LLC
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