Quattro 2 User's Guide, issue 2. 6666533 - Waters

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$Waters 2414 Refractive Index Detector$

Quattro II User's Guide The status of the system is indicated at all times by the front panel lamps: VENT PUMP Green Red Green Red Green OPERATE Red Pump Rough Flash Pump High (Standby) Operate Transient Pressure Trip (Operate) Transient Pressure Trip (Standby) RF Trip Turbo Wind Down Flash Turbo Shutdown Venting Flash Vented Protection Transient Pressure Trip The transient trip is designed to protect the instrument from potentially damaging pressure surges and operates routinely when solvent elutes from the GC column. Should the vacuum gauge(s) detect a pressure surge above the preset trip level (normally set at 10 -4 mbar by software) the following events occur: Routine Procedures Page 30
Quattro II User's Guide • The system turns off the critical source, analyser and detector voltages. • The green OPERATE and PUMP lamps are extinguished, and the red lamps show. • Acquisition continues though, of course, no real data are recorded. When the vacuum recovers, voltages are restored and PUMP and OPERATE are green. The period during which the trip was operative will appear in a raw total ion chromatogram as a period of reduced baseline noise. Further deterioration of the system pressures results in a “vacuum fault” condition and the system is shut down (see below). Water Failure A failure of the water supply for more than a brief period results in a “Vacuum Fault” condition and the system is shut down (see below). Vacuum Fault A vacuum fault can occur as a result of: • a failure of the water supply. • a vacuum leak. • a malfunction of the turbomolecular or rotary pumps. A vacuum fault causes the turbos to stop pumping and is signalled by the red PUMP lamp flashing as the turbos wind down. This lamp becomes steady when the turbos stop. Proceed as follows: Switch off the power to the rotary pumps. Investigate and rectify the cause of the fault (see “Fault Finding”). Pump down the instrument as described earlier in this chapter. Power Failure In the event of an unexpected failure of the electrical supply the instrument is vented safely. If power is unlikely to be restored quickly, follow the shutdown procedure described later in this chapter. When power is restored follow the start-up procedure. • Should the power fail and then be restored while the instrument is unattended, the system will advance to the “Select PUMP” position in the left hand column of the flow diagram earlier in this chapter. Routine Procedures Page 31
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NEXT FUNCTION PUMP PROBE Quattro II
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Quattro 2 User's Guide, issue 2. 6666533 - Waters

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