Waters 1500-Series, Руководство оператора

Страница: 90 / 188

4-6 Preparing for Operation
During normal operation, the degasser stops operating if the pump does not
deliver flow for 30 minutes. During the startup sequence, the degasser stops
operating if the pump does not deliver flow for 3 minutes.
Before you start the pump, make sure these tasks are completed:
• Degasser eluent tubing is connected to the eluent reservoirs and pump
inlet manifold
• The degasser vent line is connected to a suitable waste container
The degasser’s degassing membrane can withstand a maximum pressure of 10
psi (70 kPa).
Controlling the degasser
The degasser is enabled by default. It operates briefly, following power-up,
and continuously during pump flow.
These events take place when the degasser is enabled:
• The LED on the 1500-series pump front panel illuminates.
• The vacuum pump begins its evacuation.
Normal operation begins when the vacuum pump reaches its vacuum target
and changes from high to low RPM.
If the degasser fails, you can continue pump operation without the degasser by
setting the degasser toggle switch (located at the top of the degasser unit) to
Off.
Tip:
The degasser is intended for use at all times during pump flow. Set the
toggle switch to Off only if the degasser fails.
These events take place when you disable the degasser by setting the degasser
toggle switch to Off:
• Vacuum pump operation stops.
• The LED on the pump front panel flashes yellow (0.5 seconds on and 2
seconds off).
The degasser remains in the disabled mode until you set the switch to On.
Data control software cannot override the disabled mode.
Caution:
To avoid damaging the degasser, do not apply more than 10 psi
(70 kPa) to the eluent reservoirs.