Leaks - Thermo Scientific EASY-nLC 1200 Troubleshooting And Maintenance Manual

3
Maintenance Scripts and Service Records
Maintenance Scripts

Leaks

Step Event
1 The pump refills.
2 The associated valve centers, blocking the solvent flow through the valve.
3 The pump builds pressure to the selected value.
4 When the pressure stabilizes at the specified value, the pump calculates the flow loss based on the pump
piston movement required to maintain this pressure. If the flow loss is less than 400 nL/min, the pump passes
the leak test.
44 EASY-nLC 1200 Troubleshooting & Maintenance Guide
The Leaks script tests for possible leaks at the pump seal and in the valve, plus it's associated
flow path (high-pressure subsystems A or B). The Leaks script can also test for system leaks in
the flow path downstream of valves A and B.
Use this script when you suspect leak problems in the pumps (pump piston seals), in the flow
path between the pump outlet and the associated valve, or downstream of valves A and B. For
information about running the system leak test, see
page 178.
Note There is no leak test for pump S as it does not operate under high pressure during
normal use.
Figure 31 shows the parameters for the Leaks script
Figure 31. Leaks script parameters
During the leak test of pump A or B, the following events occur.
"Running a System Leak Test" on
Thermo Scientific