Waters ACQUITY UPLC M-Class System Manual page 34

was prior to tightening. The second edge of the safe tightening zone is the 90-degree
maximum tightening point.
Safe tightening zone positions
Edge of slot in knob
First edge of safe tightening zone
Second edge of safe tightening zone
2.6.1.3.1 Testing the port with the port gauge
To help ensure leak-free connections, you can test the port's acceptability before installing a
ZenFit fitting into a port in a valve, tee, column, or union.
To test a port:
1. Install the port-testing gauge in the port by screwing it in clockwise.
Figure 2–3: Placing the ZenFit port-testing gauge in a port
Port-testing gauge
2. Observe the end of the gauge's handle.
45°
90°
November 26, 2019, 715003588 Revision C
Page 34