20
BÜCHI
Fat Determination
B-820/B-821
4 Putting into operation
4.7
Checking supply lines for leaks
After connecting the pressure lines to the unit, open both cyl-
inder valves before switching on the unit, and then close them
again once the pressure is achieved. The pressure indicator
on the pressure reducing valve should remain constant for
approx. 10 minutes. The cylinder valves can be reopened
once this check is completed.
The primary pressure, the tightness of the supply lines and
the gas flow (see Section 4.9, "Setting the correct gas flow
rate“) must be rechecked every time a gas cylinder is changed.
Check the separation column for possible fractures and cracks
before each use. The unit must not be operated if the
separation column is damaged (hydrogen leak).
