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N/A
Water and hydrocarbons absorb in the near IR at 3.4 to 3.5 microns (2930 cm-1). By dissolving the oil content of a sample into fluorochlorocarbon (freon), which is nonabsorbing at 3.4 to 3.5 microns, and following the extraction procedure established in EPA methods 413.2 and 418.1, a working curve is prepared using blank solvent (freon) and known standards. Samples are then compared to the calibration curve in direct ppm readings shown on the instrument. Repeatability is ±1% on identical samples.
The Model 2930 can also be used with hexane based EPA method 1664, which is an analysis technique that does not require the use of freon as a solvent. A special cell is an optional accessory for this freon-free technique.
Features And Specifications
- Fixed 3.42 micron wavelength and 30 cm-1 bandwidth allows quick 10 second analysis without unnecessary scanning. Response time is a maximum of 40 seconds in damping 2 mode. Furthermore, the operating range permits the use of stable coated quartz optics that are not subject to degradation over time.
- Digital readout in %T, absorbance or concentration. Ranges: 0-100% T; 0-2 absorbance units; and 0-1 and 0-0.1 concentration. Built in scale expansion. Direct ppm readout. Recorder output is provided for optional recorder.
- Built in curve linearizer. Higher concentrations easily calibrated. Small footprint requires minimal benchspace. Portable. Weight: 20 pounds. Dimensions: 14” W x 11” D x 10” H.
- PbSe Peltier cooled detector provides signal to noise ratio of > 2500 to 1, instrument stability (drift) < 0.01 absorbance units per hour and photometric accuracy of ±1%.
- Instrument is simple to master and use, requires no maintenance, purging or special atmospheres and is warranted for a full year. Source is enclosed to avoid open source hazards.
- Electrical: 115/230v, 50-60 Hz, 80 watts.
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