Installation Process
Calibrating
leakage compensation
After power has been applied, the purging valve closes and air flow into the
enclosure is controlled by the leakage compensation valve. The initial
setting (fully open) is usually too high. Setting an appropriate working
pressure saves purge gas.
To adjust the valve:
1.
Watch the internal gauge and close the leakage control valve slowly
until the relief valve closes.
The leakage control valve was much too far open. Once the leakage
control valve is closed enough to allow the relief valve to close, the relief
valve starts to open intermittently as the pressure rises to the point
where it exceeds the relief valve opening pressure. When the valve
opens, pressure falls quickly to the point where the valve closes again
and pressure begins to build again.
Note the pressure. This is the cycling pressure.
2.
Watch the internal gauge and slowing close the leakage control
valve until the pressure drops to a point where the relief valve
remains closed all the time.
Note the pressure. This is the stable pressure.
3.
Watch the internal gauge and slowly open the leakage control valve
until the enclosure pressure reaches the mid-point between the
cycling pressure and the stable pressure.
This setting is the working pressure for the enclosure. It should be
around 5 mbarg, 2 in H
2
O, or 500 Pa
Thermo Fisher Scientific
Antaris EX Safety, Installation, and Site Preparation Guide
61
Содержание Antaris EX
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