The quaternary pump comprises an optional solvent cabinet, a vacuum degasser and a four- channel gradient pump. The four-channel gradient pump comprises a high-speed proportioning valve and a pump assembly. It provides gradient generation by low pressure mixing. A solvent cabinet provides enough space for four one-liter bottles. An active seal wash (optional) is available when the quaternary pump is used with concentrated buffer solutions.
Specifications:
| Type | Specifications |
|---|---|
| Hydraulic system | Dual piston in series pump with servo-controlled variable stroke drive, power transmission by gears and ball screws, floating pistons |
| Setable flow range | Set points 0.001 – 10 mL/min, in 0.001 mL/min increments |
| Flow range | 0.2 – 10.0 mL/min |
| Flow precision | ≤0.07 % RSD, or ≤0.02 min SD whatever is greater, based on retention time at constant room temperature |
| Flow accuracy | ± 1 % or 10 μL/min whatever is greater, pumping degassed H2O at 10 MPa (100 bar) |
| Pressure operating range | Operating range up to 60 MPa (600 bar, 8700 psi) up to 5 mL/min Operating range up to 20 MPa (200bar, 2950 psi) up to 10 mL/min |
| Pressure pulsation | < 2 % amplitude (typically < 1.3 %), or < 0.3 MPa (3 bar, 44 psi), whatever is greater, at 1 mL/min isopropanol, at all pressures > 1 MPa (10 bar, 145 psi) |
| Compressibility compensation | User-selectable, based on mobile phase compressibility |
| Recommended pH range | 1.0 – 12.5, solvents with pH < 2.3 should not contain acids which attack stainless steel |
| Gradient formation | Low pressure quaternary mixing/gradient capability using proprietary high-speed proportioning valve |
| Delay volume | 600 – 900 μL, dependent on back pressure; measured with water at 1 mL/min (water/caffeine tracer) |
| Composition range | 0 – 95 % or 5 – 100 %, user selectable |
| Composition precision | < 0.2 % RSD or < 0.04 min SD, whatever is greater, at 1 mL/min; based on retention time at constant room temperature |
| Integrated degassing unit | Number of channels: 4 Internal volume per channel: 1.5 mL |
| Control | Agilent control software (e.g. ChemStation, EZChrom, OL, MassHunter) |
| Local control | Agilent Instant Pilot |
| Analog output | For pressure monitoring, 2 mV/bar, one output |
| Communications | Controller-area network (CAN), RS-232C, APG Remote: ready, start, stop and shut-down signals, LAN optional |
| Safety and maintenance | Extensive diagnostics, error detection and display through Agilent LabAdvisor, leak detection, safe leak handling, leak output signal for shutdown of the pumping system. Low voltage in major maintenance areas. |
| GLP features | Early maintenance feedback (EMF) for continuous tracking of instrument usage in terms of seal wear and volume of pumped mobile phase with pre-defined and user settable limits and feedback messages. Electronic records of maintenance and errorsHousingAll materials are recyclable |
