Specifications

8200 Compressor Maintenance Procedures
Installation, Operation, and Service Instructions Unscheduled Maintenance
Brooks Automation 8040353
Revision 108
5-7
There are two conditions that require the addition of helium gas:
1. Compressor not operating; helium pressure gauge reads 245 psig or below.
2. Compressor operating; helium pressure reads 270 psig, or below.
To add helium gas:
1. Attach a pressure regulator (0-3000/0-400 psig) and charging line to a helium
gas (99.999% pure) bottle. DO NOT OPEN THE BOTTLE AT THIS TIME.
Purge the regulator and charging lines as instructed in steps a through e below.
Do not use helium gas that is less than 99.999% pure.
a. Open the regulator a small amount by turning the adjusting knob clock-
wise until it contacts the diaphragm, then turn approximately 1/8 to
1/4 turn more, so that the regulator is barely open.
b. Slowly open the bottle valve, and purge the regulator for 10 to 15 sec-
onds. Turn the regulator knob counterclockwise until the helium stops
flowing.
c. Connect the charge line to the helium pressure regulator.
d. Remove the flare cap of the gas charge fitting on the rear of the compres-
sor. Loosely connect the charge line to the charge fitting.
e. Set the helium pressure regulator to 10 to 25 psig (70-125 kPa). Allow
helium gas to flow through the charging line and around the loosened
flare fitting for 30 seconds to purge the charging line of air. Then tighten
the flare nut at the end of the charge line.
(This procedure is required to ensure that both the regulator and the charging
line will be purged of air and that the air trapped in the regulator will not dif-
fuse back into the helium bottle. For best results, CTI suggests a dedicated
helium bottle, regulator, and line, which are never separated, for adding
helium.)
2. Set the helium pressure regulator to 300 psig (2070 kPa). Depending on the
compressor operating state, add helium gas:
a. If the compressor is running (approximately 2 hours operating time)
under normal operating conditions, slowly open the helium charge
valve on the rear of the compressor. When the helium pressure gauge
rises to 270 - 290 psig (1860 - 2000 kPa) tightly close the charge valve.