Accession Number:

AD0836219

Title:

MEASURING PH WITH HIGHLY RESISTANT MEASURING DEVICES

Descriptive Note:

Journal article

Corporate Author:

FORT DETRICK FREDERICK MD

Personal Author(s):

• Wolf, Hans J.

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:

• *MEASURING INSTRUMENTS
• ELECTRICAL CONDUCTIVITY
• CATHODES
• LABORATORY EQUIPMENT
• WEST GERMANY
• WIRING DIAGRAMS
• CHEMICAL INDICATORS
• ANODES
• PH FACTOR
• TRANSLATIONS
• CHEMICAL REACTIONS

Subject Categories:

• Physical Chemistry
• Test Facilities, Equipment and Methods

Distribution Statement:

APPROVED FOR PUBLIC RELEASE