Cryomech LNP-40, Инструкция по установке, эксплуатации и текущему обслуживанию

Страница: 52 / 102

Installation
6-2
6.2 Dewar installation
•
Confirm that the physical space containing the dewar has an ambient temperature in
the range of 45 to 100°F (7 to 38°C).
•
If the dewar is installed in an enclosed, confined space, an oxygen monitor/alarm
should be installed to protect against a deficient oxygen level.
•
If the dewar ruptures or develops a leak, the liquid nitrogen will quickly vaporize and
may create dangerously low oxygen concentrations in the ambient air. Being
odorless, colorless, tasteless, and nonirritating, nitrogen has no warning properties.
Humans possess no senses that can detect the presence of nitrogen. At low oxygen
concentrations, unconsciousness and death may occur in seconds and without
warning.
WARNING
Personnel, including rescue workers, should not enter areas where the oxygen
concentration is below 19.5% unless provided with a self contained breathing
apparatus or air-line respirator.
•
Locate the dewar within 10 ft (3 m) of the helium compressor package and the N
2
generator/filter bank panel. If greater separation is required, longer helium or nitrogen
flex lines will be needed.
•
Position the dewar so there is sufficient space around it for attaching the helium flex
lines to the cold head and the nitrogen inlet coupling. Consideration should also be
given to the space required for the user to remove liquid nitrogen from the dewar.
•
Once in position, lock the dewar’s wheels.
6.3 Helium compressor installation
The entire section on compressor installation should be reviewed before installing the
compressor package.
CAUTION
Failure to follow these installation guidelines could result in voiding the warranty.
6.3.1 Prepare the helium compressor package location
•
Confirm that the physical space containing the helium compressor package has an
ambient temperature in the range 45 to 100
°
F (7 to 38
°
C).
•
Place the compressor package in a level position. For the helium compressor
package to operate under optimal conditions, it must be oriented within 5
°
of being
level.
WARNING
The helium compressor package must be positioned to provide easy access to the
front-panel mounted circuit breaker.