Agilent Technologies 4890 - Page 15

Installing Rotary Valves
Installing Rotary Valves 13
Column 1
Column 2
Carrier
Adjustable restrictor valve
OFF
Detector
or valve
Column 1
Column 2
ON
Column isolation*
*Temperature limited to 235 °C by micrometering needle valves
Stream 1 ln
Vent
Stream 2 ln
to GSV
Sample in
OFF
ON
Two stream selection (requires gas sampling)