U.S. Environmental Protection Agency, Contracts Unit, 100 Alabama Street,S.W., Atlanta, GA 30303

66 -- INSTRUMENTS & LABORATORY EQUIPMENT MERCURY ANALYZER SOL RFQ017 DUE 041197 POC Stacy Hill (404) 562-8375 Tekran model 2537A or equal Continous Mercury Analyzer capable of continously monitoring mercury at sub-parts per trillion levels 1 ea. to include the following features: a-It must have a dual cartidge arrangement to allow continuous sampling of the air stream. While one cartridge is sampling ambient air, the other is being analyzed. There are thus no gaps in data. b-The cartridge must be made of pure gold and capable of withstanding many tens of thousands of desorption cycles without degradation. c-The instrument must be sufficiently quick to allow data to be obtained in near real time (5 minute update rate typical, 2.5 minutes minimum). d-Must have an internal permeation source to allow the instrument to recalibrate itself automatically. It is thus possible to leave the instrument unattended for extended periods of time. Nominal permation rate 1 picogram/second. e-Must have a bypass valve arrangement to prevent contaminated air from contacting the detector, making cleaning operations infrequent or totallly unnecessary. f-Must have an inert gas optical purge feature to improve the stability of the detector. The instrument should require very infrequent adjustments to the Gain and Sensitivity controls. g-An electronic mass flow meter must be used to measure the ambient air sample flow rate. Must have a closed loop controller to adjust the pump speed to maintain the desired flow rate. Must have internal microprocessor that calculates the sample volume from the actual MFM readings to provide more accurate sample volumes than are possible using rotameters. h-An electronic mass flow controller must be used to adjust the carrier gas flow rates for optimum performance and minimum gas usage. A full size tank of argon should typically last for two or three months of continuous analysis at 5 minute cycles. An internal control solenoid must shut off carrier gas when the instrument is turned off or in the event of a power failure. I-It must have analog, digital, and RS-232 outputs, as well as control inputs, allowingit to integrate into virtually any air quality telemetry system. J-It must have compact, self contained, and rack mountable. All required components including pump, internal microcomputer, calibration source, etc must be included. Tekran model 2537A or equal Option 001 Internal Permeation Source 1 ea with the following features: a- a precision temp. controlled aluminum block containing the permeation chamber is maintained to within 0.05degrees C of the setpoint, resulting in stable emmision rates The range of allowable temp. is from 45 to 75 degrees C, with 50 degrees being the normal setting. A variety of permeation tubes, ranging in lenght from 1 to 3 cm may be installed in the chamber to accommodate a variety of calibration concentrations. In order to prevent contamination and eliminate any possiblity of oxidation on the permeation tube surface, only inert gas is used to provide a continuous purge flow. A capillary restrictor, fed by the pressure regulator provides this constant flow. . Tekran model 2537Aor equal Custom Aluminum Shipping case designed to fit all shipping of the instrument protecting it from falls up to 24" 1 ea. Interested parties may obtain a copy of this solicitation by calling Stacy Hill at 404-562-8375. Small Business-Small Purchase Set- aside is applicable. All responsible sources may submit an offer which will be considered.***** (0084)

Loren Data Corp. http://www.ld.com (SYN# 0267 19970327\66-0007.SOL)