D Maintain High-Purity Gases
EVACUATION METHOD
To use this method, the gas tank must be within 10 feet of the instrument.
1. Do one of the following:
If... Then...
The regulator has not
been filled with gas and
the gas line is attached
to the instrument:
Close the gas cylinder valve.
Open the regulator shut-off
valve.
The regulator is filled
with gas:
Close the gas cylinder valve.
Open the regulator shut-off
valve.
Loosen the helium inlet fitting
(or nut) on the instrument.
Allow all of the gas in the reg-
ulator to expel from the line
(pressure reading will be zero).
Retighten the helium inlet fitting
(or nut).
2. Go to Unit > Enable manual control (if the instrument schematic is not displayed, go to
Unit > Show instrument schematic).
If multiple instruments are installed, ensure the correct Unit menu is selected.
3. Close all valves, then open valves 6, 7, and 10.
4. Allow evacuation to continue for 20 minutes. This pulls a vacuum on the helium line to the
gas cylinder. The manifold pressure transducer should fall close to zero.
Allow evacuation for a full 20 minutes. If evacuation time is too short, trapped air may
remain in the lines.
5. Close valves 6, 7, and 10.
D - 4
TriStar II Plus Operator Manual
303-42800-01 (Rev M ) — Sep 2023
To Next Page
Loading...
