Measuring and testing – Instrument proving or calibrating – Volume of flow – speed of flow – volume rate of flow – or mass...
Patent
1977-08-29
1979-01-30
Swisher, S. Clement
Measuring and testing
Instrument proving or calibrating
Volume of flow, speed of flow, volume rate of flow, or mass...
G01W 118
Patent
active
041365500
ABSTRACT:
A method of and device for checking hygrometers and hygrostats, according to which the hygrometer or hygrostat is at its place of mounting checked by means of a reference device, such as a reference hygrometer directly indicating the air humidity. The reference hygrometer is first by means of a corresponding saturated solution calibrated to a standard climate corresponding to the operational climate (Betriebsklima) with regard to the relative humidity, and subsequently at the place of mounting of the device to be checked. The reference hygrometer is together with the hygrometer to be checked exposed to the same conditions. After the reference device has been adapted to the operational conditions (Betriebsbedingungen), the device to be checked is equalized with the reference device.
REFERENCES:
patent: 719968 (1903-02-01), Wood
Wexler et al., Fundamental Techniques for Calibrating Hygrometers, Instrumentation, 1st Quarter 1952, vol. 6, #5, pp. 25, 26 and 27.
Handbook of Physics & Chemistry, 38th Edition 1956-1957, Chemical Rubber Publishing Co., Cleveland, Ohio, pp. 2248, 2249.
Becker Walter
G. Lufft Metallbarometerfabrik GmbH & Co.
Swisher S. Clement
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