Coleman Instruments had recently coupled a pH meter with an optical phototube unit to examine the visual spectrum ( the Coleman Model DM ).
32.
By October 1934, he had registered patent application US Patent No . 2, 058, 761 for his " acidimeter ", later renamed the pH meter.
33.
Other examples of signals are the output of a thermocouple, which conveys temperature information, and the output of a pH meter which conveys acidity information.
34.
It is also used as a primary standard for calibrating pH meters because, besides the properties just mentioned, its pH in solution is very stable.
35.
The pH meters were sold to fertilizer plants throughout Japan to monitor pH levels in the production of ammonium sulfate fertilizer for use in rice production.
36.
The head of laboratory, professor Poul Astrup, and anesthesiologist Bj�rn Ibsen discovered the right diagnosis by measuring the pH value in blood using Radiometer s pH meters.
37.
In general, weak acid / weak base titrations are impossible to perform with a coloured indicator or a pH meter, although they are sometimes possible by conductimetry.
38.
He saw a potential market for reliable, low-cost pH meters in Japan's food and chemical industries, and partnered with Kitahama Works, a major scientific instruments company, to sell them.
39.
When an ion diffuses from a region of activity to another region of activity, there is a free energy change and this is what the pH meter actually measures.
40.
In developing the Model D, Beckman took the direct-coupled amplifier circuit from the pH meter and combined the optical and electronic components in a single housing, making it more economical.
