Record-Keeping Functions; Power Supply; Solvent Management System Overview - Waters Alliance e2695 Operator's Manual

1.1.5

Record-keeping functions

The separations module automatically records the following information:
• System errors
• Programmed operating conditions for each run (local methods only)
System errors may be viewed from the front panel by pressing the Log soft key. Local methods are
viewable on the front panel, and they can be printed if a printer is attached or transferred to an
external device using the RS-232 port. Remote methods (sent from Empower) are not recorded or
viewable on the front panel.
1.1.6

Power supply

The separations module is factory-equipped with a power supply of sufficient capacity to
simultaneously power an optional sample heater/cooler.
The power supply is protected against short circuits. It does not use external replacement fuses,
and is instead reset by powering-off the instrument and then powering it back on.
1.2

Solvent management system overview

The solvent management system blends and delivers solvents from the reservoir bottles to the
sample management system via a pulse-free, low-dispersion flow path. The system incorporates a
serial flow path, two independently driven plungers, and two check valves for optimal flow control.
Synchronized Composition Control (SCC) determines the gradient proportioning valve (GPV)
actuation rate based on the selected flow rate, composition and piston volume.
Figure 1–5: Flow path through the solvent management system:
In-line
degasser
Solvent D
Solvent C
Solvent B
Solvent A
1. The solvent is processed through the in-line vacuum degasser.
2. The gradient proportioning valve blends the solvents.
3. The blended solvents flow through the inlet check valve and into the primary piston chamber
while the accumulator piston delivers solvent, under pressure, to the system pressure
transducer.
Gradient
proportioning
valve
D
C
Primary
piston
chamber
A
B
Check valve
February 27, 2018, 715003794 Rev. C
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Accumulator
System
piston
pressure
chamber
transducer
Primary
pressure
transducer
Check valve
Prime/vent In-line
valve filter