Channel 4 Measured Flows

**General Flows**
O₂ doping	measure at tee leading into ECD	about 1 cc/min	_________________
N₂ make-up	measure at make-up port on ECD	about 25 cc/min	_________________

**Flows in state 1 (GSV 4: load, GSV 5 inject)**
Sample loop flush flow	GSV 5 port 7	about 80 cc/min	_________________
Helium flow through main column	measure at tee leading into ECD	about 3 cc/min	_________________
Helium backflush flow through pre-column	GSV 4 port 10	about 10 cc/min	_________________

**Flows in state 2 (GSV 4: inject, GSV 5 load)**
Main Helium flow through both columns	measure at tee leading into ECD	about 3 cc/min	_________________

**Flows in state 3 (GSV 4: load, GSV 5 load)**
No measurements