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CB / CB-UL, CBF / CBF-UL (E7) 07/2021 Page 37/197
Leak test
After connecting the gas cylinder, check all gas connections for leaks (e.g. with leak spray or diluted
soap solution).
The recovery times of the gas concentrations inside the chamber after opening the door are
indicated in the technical data (chap. 24.4) and refer to a connection pressure of 2.0 bar / 29
psi. Decreasing supply pressure will result in longer recovery times.
Conversion table for gas inlet pressures, bar – psi, see chap. 24.8.
4.4.2 Connection of the O
2
gas cylinder (chamber with O
2
control with optional
alternative control range 10 up to 95 vol.-% O
2
)
Note: Do not connect the O
2
cylinder or disconnect the gas supply (by pulling off the gas
hose) when operating at setpoints below 19 vol.-% O
2
.
Oxygen (O
2
) is colorless and almost odorless and therefore practically imperceptible. It promotes burns,
which can proceed explosively. There is a fire hazard for flammable oxygenated materials, e.g. clothes and
hair. O
2
is heavier than air and may accumulate in low-lying areas.
DANGER
Danger of fire and explosion through contact of combustible materials with O
2
with high concentration of O
2
(> 21 % O
2
).
Serious injury or death from burns and / or explosion pressure.
∅ Do NOT set up chambers in non-ventilated recesses.
Ensure technical ventilation measures.
Observe the relevant regulations for handling O
2
.
Close the O
2
supply when decommissioning the chamber.
The O
2
gas necessary for operation must have a technical grade of 99.5 %.
The gas connections must be established by qualified personnel who are trained in handling
the respective gases and familiar with the required safety measures.
The following steps are required:
Ensuring the correct O
2
output pressure
A gas supply pressure above 2.5 bar / 36 psi will result in chamber damage.
Use a pressure reducer and make sure to avoid any excessive outlet pressure when connecting the gas
hose to the chamber.
The real outlet pressure of gas cylinders, sets of gas cylinders or central gas supplies am on the second
manometer must not exceed 2.5 bar / 36 psi.
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