Calibration of pressure gages is accomplished by use of fluid chamber in conjunction with conventional single chamber hydraulic deadweight tester. System eliminates cleaning of gages with liquid oxygen after tests and is simple to construct and operate

Hensley, D. R.

English

NASA Technical Reports Server

November 1970
	
Brief 70-10586 
NASA TECH BRIEF 
NASA Tech Briefs announce new technology derived from the U.S. space program. They are issued to encourage commercial 
application. Tech Briefs are available on a subscription basis from the National Technical Information Service, Springfield, 
Virginia 22151. Requests for individual copies or questions relating to the Tech Brief progam may be directed to the Tech-
nology Utilization Division, NASA, Code UT, Washington, D.C. 20546. 
-
Deadweight Calibration of Pressure Gages Without Contamination 
Use of a novel fluid chamber, in conjunction with 
a conventional single-chamber hydraulic deadweight 
tester, eliminates cleaning of the gages with liquid 
02 after tests. During calibration the oil in con-
ventional single-chamber testers contaminates the 
gages for gaseous N 2 . Commercial double-chamber 
_—s
Fluid Chamber 
Gage to 
be Calibrated 
L1rh1t
p . 
testers, with diaphragms separating the test oil from 
the gage fluid, are expensive and cumbersome, es-
pecially when the medium is changed; the innovation 
is simpler and cheaper. 
Pressurized dry gaseous N 2 is applied to the oil of 
the reservoir through 0.25-in, stainless-steel tubing (see
fig.). The same gas is also admitted to the pressure gage 
(being calibrated) through a tee ahead of the reservoir. 
The oil is further isolated from the gage by a filter (va-
por trap) at the inner end of the gas inlet to the re-
sevoir. 
The innovation is simple in construction and opera-
tion, and its inexpensive materials make it suitable for 
small-shop fabrication. A sight glass provides a positive 
check on the fluid level. The new chamber is especially 
suited to small organizations unable to afford elabor-
ate equipment. 
Note: 
No additional documentation is available. Specific 
questions, however, may be directed to: 
Technology Utilization Officer 
Code A&TS-TU 
Marshall Space Flight Center 
Huntsville, Alabama 35812 
Reference: B70-10586 
Patent status: 
Inquiries about obtaining rights for the commercial 
use of this invention may be made to NASA, Code 
GP, Washington, D.C. 20546. 
Source: D. R. Hensley of

North American Rockwell Corp.

under contract to

Marshall Space Flight Center

(MFS- 18690) 
Category 07 
This document was prepared under the sponsorship of the National	 Government assumes any liability resulting from the use of the 
Aeronautics and Space Administration. Neither the United States	 information contained in this document, or warrants that such use 
Government nor any person acting on behalf of the United States 	 will be free from privately owned rights.
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Deadweight calibration of pressure gages without contamination

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