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AA-6800/6650 Instruction
7. Pressure regulator
(1) Use approved pressure regulators and connectors. For details, contact your Shimadzu
Representative.
(2) When installing the pressure regulator to the cylinder, be sure to wipe the dust at the outlet of the
cylinder.
(3) Damaged or cracked screws for installing the pressure regulator may cause gas leakage. Do not
install the pressure regulator forcibly, but replace with a new gas cylinder.
8. Cylinder opening/closing
(1) Before opening the cylinder, be sure to check that the stop valve is closed. Turn the secondary
pressure adjusting valve fully to the left, and open the cylinder using a special handle. Even if the main
valve is too tight to open, do not hit the handle or main valve with the hammer or spanner.
(2) After the main valve is opened, apply soapy water to the connection of the pressure regulator to check
if no gas leak is generated. Also check the connection at the main valve.
(3) Completely open the main valve of the cylinder for nitrous oxide gas, argon gas and hydrogen gas. If it
is not completely opened, the flow rate of the gas, particularly of the nitrous oxide gas, may fluctuate
during use.
(4) When opening the main valve of the cylinder for acetylene gas, rotate it by 1 rotation or 1.5 rotations
from the state of complete closing.
To prevent outflow of acetone from the inside of the cylinder, do not open the valve exceeding 1.5
rotations from the state of complete closing. On the contrary, if the main valve is not sufficiently
opened in case of nitrous oxide-acetylene flame (high temperature flame), flashback may be caused
due to insufficient acetylene when the flame is switched from an air-acetylene flame to nitrous
oxide-acetylene flame.
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