Bio-Rad ChromLab™ Software - Manual (Page 282)

C | Plumbing the System
280 | NGC Chromatography Systems and ChromLab Software
To plumb the buffer blending valve
 Connect the inlet tubing to ports Q1–Q4 on the buffer blending valve.
Note: The buffer inlet tubing is color-coded to identify the different buffer
solutions.
The color scheme for the tubing and ports is defined as follows:
Tubing color Port Solution
Green Q4 High salt buffer
Yellow Q3 Water
Blue Q2 Buffer base
Red Q1 Buffer acid