D
Warning
Avoid this
action
Do not apply any shock to the glass bell jar, and avoid heating it to
50°C or higher.
In a case of explosion upon vacuum condition, the exploded pieces
will spread.
This may cause a serious damage to the product.
Check
ventilation
Always ventilate the room when using liquid nitrogen because the
oxygen content may be decreased due to increase of liquid nitrogen
gases. This may cause an oxygen deficiency accident.
Caution
Wear gloves
When using liquid nitrogen, wear gloves to protect your hands.
If liquid nitrogen splashes and adheres to your skin, you may feel
acute pain momentary.
Leave open
air
After the oil sealed rotary vacuum pump stops, open BACK.P
VENT(or RP VENT) to leave the inside of the roughing piping open
air.
This must be done to prevent reverse oil flow.
Confirm
complete close
After confirming complete closure of the main valve, open the
vacuum chamber and expose it to the air.
If air comes into the oil diffusion pump during operation, it
deteriorates the oil and lowers the performance.
An inflow of air during liquid nitrogen injection will cause condensable
gases to adhere to the trap excessively, thus degrading the
performance.
Operations
