Description
The detector is a full-featured, time-programmable, photodiode array (PDA) detector capable of scanning the ultraviolet-visible wavelength range from 190 to 800 nm. You can acquire data across the entire spectral range (with an effective resolution of 1.2 nm) at a rate of 0.5 to 80 Hz with 20-bit digital conversion.
The PDA detector is a benchtop unit for inclusion in the Accela liquid chromatography system. You control the detector through an Ethernet link to a data system computer that has the Xcalibur or ChromQuest data system installed. The detector consists of a dual-light source, an optical bench, a photodiode array, a low voltage power supply, several printed circuit boards (PCBs), and four status light-emitting diodes (LEDs).
Manufacture Specification
- Wavelength Range- 190–800 nm at 1 nm increment
- Wavelength Accuracy- ±1 nm at 254 nm and 640 nm
- Wavelength Calibration- Using Holmium oxide solution
- Wavelength Resolution- 1.2 nm (512 pixel array)
- Absorbance Non-Linearity- < 5% at 2.0 AU at 257 nm
- Absorbance Range- -2.0 to +4.0 AU, 20-bit resolution
- Drift- < 1 mAU/hr after warm-up at 254 nm at a stable temperature (±1°C)
- Light Source- Pre-aligned Deuterium and Tungsten lamps
- Rise Time- User selectable: 0, 0.02, 0.05, 0.1, 0.2, 0.5, 1, 2, 5, or 10 sec
- Scan Rate- User selectable: 0.5, 1, 2, 4, 5, 10, 20, 40, or 80 Hz
- Discrete Channels- Three wavelength selectable channels
- Short-Term Noise (50 mm ow cell)- < 6 µAU/cm at 254 nm at 5 Hz (20 Hz scan rate) < 1.5 uAU/cm at 254 nm at 5 Hz (40 Hz scan rate); typical < 0.3 uAU/cm at 254 nm at 5 Hz (80 Hz scan rate); typical
- Warm-up Time- 90 min required to meet noise and drift specications
- Cell Dimensions- 10 mm, 2 µL LightPipe ow cell 50 mm, 10 µL LightPipe ow cell
- Cell Pressure Range- 0–1000 psi
- Analog Outputs- 20-bit digital/analog conversion, unattenuated at 10 mV/AU, 100 mV/AU, or 1.0 V/AU
- Diodes- 512
- Diode Spacing- 1.2 nm
