- Author
-
Levine, E. P.
|
Mills, R. M.
- Title
- High Vacuum Protective Circuit.
- Coporate
- National Bureau of Standards, Gaithersburg, MD
- Report
-
NBS 7006
November 2, 1960
7 p.
- Distribution
- AVAILABLE FROM: National Archives, Civilian Records, Room 2800, 8601 Adelphia Road, College Park, MD 20740-6001, Telephone: 301-713-7230
- Contract
- NBS-PROJECT-1002-11-10121
- Keywords
-
vacuum pumps
- Abstract
- An alarm device is described which protects the vacuum system of a mass spectrometer in the event of a malfunction during the operator's absence. The vacuum pressure is monitored by a thermocouple vacuum gauge which is connected to a meter-relay. If the thermocouple reading falls below a certain predetermined level, indicating a loss of vacuum, or if the diffusion pump cooling system fails, a system of relays is made to act in such a way that the diffusion pumps are turned off, a calibrated meter replaces the meter-relay to give an accurate reading of the vacuum level, and an alarm bell is sounded.