Firma:              Varian

Modell:            9050

Kommentar:   Dokumente engl.

The Varian LC Star 9050 is a standalone UV-Vis detector built for high performance. It is time pro­grammable, and based on a proven design for reliability. It can be integrated with the Varian LC Star System with its IBM PS/2T"" Workstation and Microsoft° Windows environment for single point control, or interfaced with other laboratory equipment for automated detection.

Performance Features

• Star 9050's low noise (0.02mAU peak to peak) and high sensitivity allow it to meet your most demanding applications.
• ''Controlled Optical Imaging'" design minimizes refractive index effects leading to baseline stability during compositional and flow programs. On-board diagnostics provide easy troubleshooting and maintenance, including a lamp hours counter for routine maintenance.
• Varian's exclusive Telediagnostics; included with a service contract, allows the Star 9050 UV-Vis Detector to connect to a Varian Service Center for rapid diagnosis.
• Complete wavelength programming allows optimized detection throughout the LC run. Choice of two easy-to-change high pressure cells (2000 psi) make it simple to move from one ap­plication to another.
• Built-in ''peak sense'" function allows automated switching of devices such as fraction collectors.

General Specifications

Display:

2 line, 40 characters/line, alphanumeric, liquid crystal display (LCD), with yellow or amber colored light emitting diode (LED) backlighting

Diagnostics:

Built-in Self-test and diagnostics

Time Programming:

Time-programmable wavelength, recorder attenuation, autozero, peaksense, timeslice, pulse, and external event relays. Store up to five methods with memory power interrupt protection.

Wavelength:

Deuterium lamp and automatically controlled second order filter, 190-700 nm

Flow Cell:

15 µI volume, 8 mm pathlength

Optional Flow Cell:

4.5 µI volume, 4 mm pathlength

Pressure:

2000 psi maximum on all flow cells

Time Constant:

0.05, 0.5, 1.0, and 5.0 sec. selectable from the keyboard

Spectral Bandwidth:

5 nm

Recorder Output:

Selectable Absorbance Ranges - 0.001, 0.002, 0.005, 0.01, 0.02, 0.05, 0.1, 0.2, 0.5, 1.0, and 2.0 AU=1 mV or 10 mV (switch selectable)

Data System Output:

2 AU = 1 volt or 10 volts, selectable from the rear panel

Peak Sensing:

Peak Start, Peak End, Valley, Timeslice, and Pulse will activate the Peaksense relay and generate event marks an the recorder chart

External Control and Communication:

To a workstation via GPIB and to other instruments via synchronization cables

Contact Closure Outputs:

Four time-programmable external event relays, one Peaksense relay, three synchronization signals: READY OUT, START OUT, and FAULT OUT

Contact Closure Inputs:

Three synchronization signals: READY IN, START IN, and FAULT IN

Bus Communication:

The Star 9050 Detector will communicate with the LC Star 9020 Workstation by means of the IEEE 488 Bus (GPIB)

Performance Specifications

Noise:

0.02 mAU peak-to-peak at 240 nm, 1 sec. time constant, 1ml/min MeOH using the 15 µI/8 mm pathlength flow cell

Drift:

Less than 1 mAU/hour after the warm-up period. The ambient air temperature must change less than 1°C per hour

Linearity:

1% to 1.5 AU at 265 nm with acetone in water

Refractive Index Sensitivity:

2 mAU baseline shift between methanol and water at 350 nm

Physical Specifications

Width : 11.5" (29.2 cm)

Depth : 22.0" (56.0 cm)

Height : 11.5" (29.2 cm)

Shipping Weight:

51.25 Ibs (23.2 Kg)

Electrical Source Requirements:

108-132 Vac (120±10%), 50/60 Hz single phase, 198-242 Vac (220±10%) 50/60 Hz single phase, or 220 Vac, 50/60 Hz two phase (phase/phase) unless otherwise stated. The 9050 module is equipped with voltage selection permitting operation on the above power sources.

Power Consumption:

170 VA

Environment:

Operation within specifications from 10° to 35°C, without failure from 0° to 50°C, and non-operational storage from -20° to 65°C. Operates in relative humidities from 5% to 95%.