LEDSPEC-2 LEDspec Biophotometric Detection System, 2 channel

LEDspec is a stand alone LED-based bio-photometric detection system targeted at flow analysis and single-scan applications. Absorbance can be measured simultaneously with high precision and dynamic range.

LEDspec can be equipped with up to 7 LEDs of different wavelength. Its noise (< 0.1 mAU peak to peak) and drift performance (Dual-beam approach)

LEDspec is based on a dual-beam approach. Light sources related baseline drift caused by warm up, temperature stability and bulb aging in conventional single beam spectrometer systems is avoided. A reference channel in the LEDspec corrects for baseline simultaneously with the sample measurement. Life time of the LED modules is virtually unlimited.

LEDspec allows measurement of absorbance, transmission or intensity at a single wavelength or at multiple wavelengths. When the detector is setup for single wavelength detection, very precise fluid injection analysis systems can be assembled, Using two wavelengths, baseline offsets caused by e.g. particles in the sample stream can be observed and automatically subtracted. Measurements at several wavelengths allow for multi-wavelength calibration. The result of the measurement can be calculated, calibrated and scaled to the user’s desirable dynamic range.

LEDspec is ideally suited for WPI’s fiber optic sampling equipment. High sensitivity detection systems for flow analysis can be assembled using WPI’s Liquid Waveguide Capillary Cells (LWCC) with effective pathlengths ranging from 2 to 500 cm. These setups are frequently used in fluid injection analysis systems for nutrient analysis (nitrite, nitrate, phosphate, iron) in oceanographic applications.

The analog output of the LEDspec can be connected to WPI’s Lab-Trax-4/16 data acquisition system for data collection and analysis. High precision intensity, absorbance or transmittance measurements can be obtained in less than a second. Only a few parameters need to be adjusted to obtain data. Chromatograms can be displayed and logged to disk. Data Export is supported in ASCII, and Excel formats. Pumps and valves can be controlled via the TTL level digital outputs of the LabTrax system. Data collection can be triggered by TTL leveled external inputs. The LabTrax software package allows display of recorded data and performs mathematical computation, derivation, smoothing, quantification and other mathematical manipulations.

Nutrient Analysis: Nitrite/nitrate @ 540 nm, Phosphate @ 700 nm, Iron @ 560 nm. Pharmaceutical Industry: Drug discovery, Dissolution Testing, Process Control. Semiconductor Industry: Water purity, Trace metal analysis: (Fe, Pd, Cu, U, etc.).

Specifications

OPTICAL BASICS	LED based multiple wavelength detector with build-in reference channel
CHANNELS	2 or 4
DETECTOR	Photodiode
WAVELENGTH RANGE:	400 nm, 450 nm, 540 nm, 560 nm, 700 nm, custom
SPECTRAL BANDWIDTH (FWHM)	10 nm
DYNAMIC RANGE	0-3 AU
DETECTOR RESOLUTION	24 Bit
NOISE (PEAK TO PEAK)*	< 0.1 mAU
WARMUP TIME	INSTANT
FIBER OPTIC INPUT	600 µm
DRIFT	< 0.5 mAU/h
DIGITAL INPUTS AND OUTPUTS	8/8
ANALOG OUTPUT	+/- 10 V, scaleable output
SAMPLE CELLS	LWCC, DipTip, SpectroPipetter, fiber opic cuvette holder
DIMENSIONS (WHD)	290 x 80 x 250 mm, (11.4â€? x 3.2â€? x 9.9â€?)
WEIGHT	2 kg (2.2 lbs)
INTERFACE	USB
MAINS	100 - 240 V / 50 - 60 Hz