18
Male plug
Figure 3.1 Pressure Test
3.1.3 Pressure Test 2 (pressure holding test)
(1) Screw a male plug into the outlet port and tighten firmly using a wrench.
(2) Tighten the purge valve firmly.
(3) Set the flow rate to 0.5 ml/min and the maximum pressure to 50.0 MPa.
(4) Begin solvent delivery.
(5) When the pump stops and the OVER PRESS message appears on the
display, press the [CLEAR] key to return to the monitor screen.
The pump is operating normally if a pressure of 35.0 MPa or higher is
maintained after 10 minutes and no external leakage is observable.
(6) If a leak is found, refer to Section 2.4 to identify the appropriate method for
dealing with the leak.
3.2 Adjustment of Zero Pressure
3.2.1 Conditions under which adjustment is required
The zero pressure setting must be adjusted when P. SENSOR ERROR appears on
the display during the self-diagnostic test performed when the power is turned on.
3.2.2 Adjustment using the PRESS ZERO ADJ trimmer
When P. SENSOR ERROR appears on the display due to time variation of the
pressure sensor, the zero pressure setting can be adjusted using the PRESS ZERO
ADJ trimmer located on the back panel. To adjust the zero pressure setting using the