Model 75-810 & 75-810-AR Noble Gas Purifier
Rev. 0 11/20
17
5 Operation
Start Up
The purifier should be purged with an inert gas (helium if -HE or argon if -AR
model, minimum purity 99.99%) for at least 10 minutes before powering on.
Apply continuous gas flow of 50 to 200 ccpm before and during initial activation.
After the 10 minute purge period, switch on power to the 75-810. The heater
is selected to heat the purifier to about 400 °C. At this temperature, the purifier
material will take 3 hours to fully activate. After this activation period, the purifier is
ready to operate at the desired flowrate.
CAUTION
IF THE 75-810 SUPPLY OR VENT LINE IS ACCIDENTALLY VENTED TO ATMOSPHERE,
ASSUME AIR HAS ENTERED THE PURIFIER. IMMEDIATELY SWITCH OFF POWER
AND FLOW HELIUM OR ARGON THROUGH THE PURIFIER AT 50 TO 200 CCPM
TO PURGE OUT ANY AIR. EXPOSURE OF THE GETTER MATERIAL TO OXYGEN
WHEN IT IS ABOVE 150 °C WILL DESTROY THE MATERIAL AND MAY INITIATE AN
EXOTHERMIC REACTION.
Examples of the performance of the 75-810 for helium and argon gases are in the
Appendix.
Shutdown
If the gas line containing the 75-810 is to be vented to air, for example during purifier
replacement, then the purifier must be at room temperature before venting to air. If
the purifier is hot, switch off power, maintain gas flow and wait 3 hours to allow the
purifier to reach room temperature.
Содержание 75-810-AR
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