Firma:              Hitachi

Modell:            F-2000

Kommentar:    Dokumente engl.

5-2 Optical System

Fig. 5-3 sketches the optical system configuration of the Model F-2000.

The radiation coming from the Xe lamp is converged at entrance slit S1 of the excitation monochromator through lenses L1 and L2. Only the light dispersed by the excitation concave grating (excitation beam) enters exit slit S2. The excitation beam from exit slit S2 is reflected by concave mirror M1 and the split into two by the beam splitter BS. The one of two excitation beams goes to the monitor detector for its measurement. And, the other beam (most of excitation) passing through BS is converged to the sample cell through lens L3.

The fluorescence coming out of the sample is restricted into entrance slit S3 of the emission monochromator through

lenses L4 and L5. The fluorescence dispersed by the emission concave grating passes through exit slit S4 and is converged at the photomultiplier via concave mirror M2 for intensity measurement.

The emission slit serves also as a shutter to protect the photomultiplier. It automatically closes upon opening the lid of the sample compartment.

Fig. 5-3            Optical System Configuration

Guaranteed Specifications

Light source

150 W xenon lamp with ozone seif-dissociation function

Monochromators

Large stigmatic concave grating having 900 lnes/mm used an both excitation and emission sides

o    Eagle mount             F: 3

o    Blaze wavelength     300 nm on excitation side

                                      400 nm on emission side

Measuring Wavelength Range

220 to 730 nm and 0-order light an both excitation and emission sides (though wavelength display is possible within 220 to 800 nm including 0-order light)

Wavelength Accuracy

Better than ±5 nm

Wavelength Scan Rate

15, 60, 240,1200 nm/min (4-step selection) (3000 nm/min in pre-scan mode)

Bandpass

o    Excitation side       10, 20 nm (2 steps)

o    Emission side        10, 20 nm ( )

Response speed

0.1, 0.5, 2 or 8 seconds for 0 to 98% response (Equivalent to a time constant of 0.025, 0.13, 0.5 or 2 seconds)

Photometric value indicating range

0.000 to 9999

Photometric principle

Monochromatic beam monitoring, ratio calculation

Minimum Sample Requirement

0.6 ml with use of the standard 10 mm cell

CRT

9-inch monochrome CRT display.

o    Contents of Display .. Measuring conditions, operating procedure, spectrum, etc.

Recorder

Thermal printer (Recording chart width : 110 mm)

Communication function

RS-232C bidirectional communication

Analog output

0 to 1 V at fullscale (12-bit D/A)

Data processing functions

o    Pre-scan

o    Quantitative calculation

          2- or 3-wavelength calculation

          Calibration curve generation (up to ten kinds of standard samples)

          Repetitive measurement averaging (up to ten times)

          Calibration curve correction/storage Time integration

o    Spectral measurement

          Peak detection

          Enlargement/reduction of graph

          Spectra storage (two spectra)

o    Time-varying measurement

          Peak detection

          Rate calculation

          Enlargement/reduction of graph

          Data storage (two spectra)

Measurement condition storage

Up to 20 parameters

(Auto start under user-defined measurement conditions is available.)

Dimensions

500 (W) x 730 (D) x 500 (H) mm

Weight

Approx. 50 kg

Power requirements.

100, 115, 220, 230, 240 V AC, 50/60 Hz

Power Consumption

400 VA (50/60 Hz usable)

Performance-guaranteed Temperature Range

5 to 35°C

Performance-guaranteed Humidity Range

45 to 80%