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9
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Specifications
Page 170
Diode Array/Multiple-Wavelength Detectors (VC-D11, VC-D12, VF-D11)
Operating Manual
9.1
Performance Specifications
9.1.1
Detector
The device performance is specified as follows:
Type
Specification
Optical design
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Single-beam, reverse-optics design with concave holographic grating
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1024-element photodiode array
Light source
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Deuterium lamp for UV and VIS wavelength ranges (30 W)
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Tungsten lamp for VIS and NIR wavelength ranges (20 W) (standard
for VF detectors, optional for VC detectors)
Wavelength range
190 – 800 nm
Spectral bandwidth
0.6 nm pixel resolution (average); < 1 nm over complete range
Diode bunching (VC‑D11 and
VF‑D11 only)
1 – 100 nm, individually programmable for each signal channel and 3D
field
Wavelength accuracy
± 1 nm
Wavelength repeatability
± 0.1 nm
Wavelength calibration
Internal calibration with D-alpha line of the deuterium lamp
Wavelength validation
Internal validation with holmium-oxide glass filter
Signal channels
VC detectors:
8 signal channels
VF detector:
10 signal channels
Data collection rate
VC detectors:
Adjustable, 0.2 Hz – 125 Hz
VF detector:
Adjustable, 0.2 Hz – 250 Hz
Filter response times (in seconds)
VC detectors:
0 (no filter), 0.05, 0.1, 0.2, 0.5, 1,
2, 5, 10, 20
VF detector:
0 (no filter), 0.01, 0.02, 0.05, 0.1,
0.2, 0.5, 1, 2, 5, 10, 20
Spectra scan
VC‑D11:
3D field with full
spectral range 125 Hz
VC‑D12:
Not available
VF‑D11:
3D field with full
spectral range 250 Hz
Noise
<± 6 µAU at 254 nm ASTM
<± 12 µAU at 520 nm ASTM
Noise reference conditions:
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Wavelength: as listed above; bandwidth 4 nm; reference wavelength:
Off; slit width: Wide
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Time constant: 2 sec (response time = 2.2 x time constant as proposed
in ASTM). For details, see below this table.
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Flow cell: 10 mm standard stainless steel flow cell
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Flow: 1 mL/min LC/MS-grade water from highly efficient water
purification system; column installed in flow path before flow cell;
pump pressure: >7 MPa
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Temperature conditions: See below this table.