Accession Number:
AD0836219
Title:
MEASURING PH WITH HIGHLY RESISTANT MEASURING DEVICES
Descriptive Note:
Journal article
Corporate Author:
FORT DETRICK FREDERICK MD
Personal Author(s):
Report Date:
1963-07-01
Pagination or Media Count:
21.0
Abstract:
PH measuring devices can be divided according to type into two main classes. In the first group, the measuring voltage is fed directly to the indicator dial after amplification. A directly coupled or a modulated amplifier can be used, a combination of both also being possible. The second main group works on the compensation principle. The measuring voltage is placed opposite a variable, calibrated compensation voltage and alternated until the difference voltage is zero. The control of the compensation current can be manual or automatic by means of a servo mechanism, the latter method often being combined with a registering device compensograph.
Descriptors:
Subject Categories:
- Physical Chemistry
- Test Facilities, Equipment and Methods