Helium Research Center internal report
Subtitle: a 10-channel automatic scanner with individually selectable channel times
By: J.R. McVey
Contributors: United States. Bureau of Mines; Helium Research Center (United States. Bureau of Mines)
Series: Helium Research Center Internal Report / U.S. Depatment of the Interior, Bureau of Mines -- no. 115; Helium Research Center Internal Report (United States. Bureau of Mines) -- no. 115.
Publisher: U.S. Department of the Interior, Bureau of Mines, Branch of Laboratory Services
Published: 1968
Place of publication: Amarillo, Tex
Language: eng
Subjects: Helium; Hydrogen; Electronic apparatus and appliances; Nitrogen; Thermal conductivity
Other titles: Bureau of Mines, Helium Activity, Helium Research Center Internal Report; Ten-channel automatic scanner with individually selectable channel times
Description: A 10-channel automatic scanner has been developed to automate a thermal conductivity apparatus used in the direct analysis of helium-nitrogen and helium-hydrogen gas samples from a phase equilibria apparatus. The unit uses unijunction transistors to provide a separate programmable time of 1 to 99 seconds for each individual channel. Individual channel timing allows the user to program measurements and/or command functions at will. The unique features of the unit are its individually programmable channel time and its compatibility with commercial digital voltmeters and printers. These features permit the scanner to completely automate the sequence of events from sample injection to the printing of the final sample results from the thermal conductivity apparatus.
Notes: "October 1968."

"Branch of Laboratory Services, Project℗7751."

Also available online via Internet Archive.