Firma:              Agilent

Modell:            Eluentenreserv

Kommentar:   Dokumente engl.

Introduction to the Micro Vacuum Degasser

The micro vacuum degasser comprises a 4-channel vacuum container, including 4 micro structured membranes, and a vacuum pump. When the micro vacuum degasser is switched on, the control circuit turns on the vacuum pump which generates a partial vacuum in the vacuum container. The pressure is measured by a pressure sensor. The micro vacuum degasser maintains the partial vacuum by turning an and off the vacuum pump depending on the signal from the pressure sensor.

The LC pump draws the solvents from their bottles through the special tubular plastic membranes of the vacuum container. As the solvents pass through the vacuum tubes any dissolved gas in the solvents permeates through the membranes into the vacuum container. The solvents will be almost completely degassed when leaving the outlets of the micro vacuum degasser.

When to Use a Micro Vacuum Degasser?

For capillary LC application with our 1100 Series Capillary LC System

For high-pressure mixing pumps with low flow rates or when you have following conditions:

•            if your detector is used with maximum sensitivity in the low UV wavelength range,

•            if your application requires optimum injection precision

•            if your application requires highest retention time reproducibility (mandatory at flow rates below 0.5 ml/min)

•            if your sample or detection is sensitive to dissolved oxygen in the mobile phase (degradation).

•            With a Fluorescence Detector.

Generally a degasser should be used when negative effects due to dissolved gas in the mobile phase exceed the limits that are acceptable for the user. Negative effects that can be caused by dissolved gas are:

•            Unstable flow due to unstable pumping conditions. This may result in a high ripple or high standard deviations of peak retention times and peak areas especially at low flow rates.

•            Baseline noise an detectors that are sensitive to changes in the refractive index.

•            Sample degradation.

•            Fluorescence Quenching due to dissolved oxygen.

•            Baseline drift in electrochemical detectors due to dissolved oxygen especially in reduction mode.

Physical Specifications

Type                                             Specification                                          Comments

Weight                                           7 kg (15.4 Ibs)

Dimensions (w x d x h)                    345 x 435 x 80 mm (13.5 x 17 x 3.1 inches)

Line Voltage                                   100 -120 or 220 – 240 VAC, ± 10 %           Wide- ranging capability

Line Frequency                               50 or 60 Hz, ± 5 %

Power consumption                         30 W                                                       Maximum

Ambient Operating Temp.                0 – 55 °C (32 -131 °F)

Ambient Non-operating Temp.          -40 – 70 °C (-4 – 158 °F)

Humidity                                        < 95 %, at 25 – 40 °C (77 – 104 °F)           Non-condensing

Operating Altitude                           Up to 2000 m (6500 ft)

Non-operating Altitude                     Up to 4600 m (14950 ft)                             For storing the

                                                                                                                  instrument

Safety Standards: IEC, CSA, UL      Installation Category II, Pollution Degree 2

Performance Specifications

Type                                             Specification

Maximum flow rate                          0 - 10 ml/min per channel

                                                    5 - 10 ml/min at reduced degassing performance

Number of channels                        4

Internal volume per channel              Typically 1 ml per channel

Materials in contact with solvent       PTFE, FEP,PEEK

pH range                                        1 -14

Analog output (AUX)                        For pressure monitoring, range 0 – 3 V