Regulator, Chamber Pressure, 3900 & NM synthesizer. This regulator is located inside the 3900 on the left side. It is a relieving regulator so it is constantly leaking a small amount of gas from a screw on the side. This small leak is normal. This regulator is used to set the chamber purge pressure. It is commonly used to make adjustment for running different columns from the original ABI columns.
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