Brooks 9600 - Increasing Helium Pressure; Adding Helium

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• To the value previously recorded in the “Compressor Operation”

procedure in “Section 4 - Operation” if the compressor is ON.

3. Close the gas charge control valve and install the flare cap.

Increasing Helium Pressure

Use the following procedure to increase the helium pressure if the

indicated pressure is below the appropriate value as shown in Table 4-1.

Adding Helium

NOTE: You must obtain the normal system operating pressure from the

“Compressor Operation” procedure in “Section 4 - Operation” in order to

perform this procedure. If the normal system operating pressure is

unknown, then shut the compressor OFF and perform the “"OFF"

Condition Helium System Pressure Verification” procedure in “Section 4 -

Operation” instead.

This procedure ensures that both the regulator and the charging line will be

purged of air and that the air trapped in the regulator will not diffuse back

into the helium bottle. For best results, BROOKS-CRYOGENICS suggests

a dedicated helium bottle, regulator, and line, which are never separated,

for adding helium.

NOTE: You are required to supply the helium charging line terminating in

a 1/4-inch female flare fitting, and a two-stage pressure regulator rated at

0-3000/0-400 psig for this operation.

1. Attach a regulator (0-3000/0-400 psig) and charging line to a

helium bottle (99.999% pure).

CAUTION

If helium is being added more than once every several months, check

for leaks caused by improperly connected self-sealing connections or

any mechanical joint in the Compressor.

CAUTION

Use only 99.999% pure helium gas. Helium circuit contamination may

result if a lower quality of helium is used.