DOC; Mountain Administrative Support Center; Acquisition Management Division; 325 Broadway MC3; Boulder, CO

66 -- NEPHELOMETERS SOL NBMGP-700465DT POC Doris Turner, Purchasing Agent, (303) 497-3872; FAX: (303) 497-3163 E-MAIL: NOAA; MASC Acquisition Management, Joyce.J.Mills@noaa.gov. The National Oceanic and Atmospheric Administration intends to purchase a nephelometer with the following minimum criteria: Continuous operation at three wavelengths, centered at 450, 550, and 700 nm is required. Optical filter bandpass shall be less than 40 nm at full- width, half-maximum (FWHM). The wavelength-controlling filters shall be mounted such that they can be easily removed for checking their transmission characteristics or replacing with a different wavelength. The overall wavelength response shall be measured, not just based on a composite of manufacturer's specifications. The instrument shall include a white reference object that can be inserted in the illuminated part of the sample volume to provide a check of the spectral response. Continuous operation in two angular-integration ranges is required. The total-scatter channel (ssp) shall cover angles of 7 (sbsp) shall cover angles of 90. Scattering coefficient (ssp and sbsp) @ 30-second averaging time of 2 x10-7 m-1 (,550 and 700 nm channels) and 5 x 10-7 m- 1 (,450 nm channel). Sensitivity is defined as two times the standard deviation of the measured ssp when sampling filtered, particle-free air. It is not the intent of the Government to issue a separate solicitation for this requirement. Interested sources proposing to supply an equivalent item must submit a written qualification statement by fax, clearly establishing capability to meet the above requirements within 15 days from the date of this synopsis. In the absence of other qualified sources, it is the intent of the government to negotiate a sole source contract under the authority of 41 U.S.C. 253 (c) (1) with TSI, Inc., P.O. Box 64394, St. Paul, MN 55164 as this source is considered to be the only known qualified source which will satisfy agency requirements. (0093)

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