US Department of Commerce/National Oceanic and Atmospheric Administration (NOAA), Systems Acquisition Office, 8455 Colesville Road, Ste. 705, Silver Spring, MD 20910

66 -- ALL-WEATHER PRECIPITATION ACCUMULATION GAUGE SOL 52-SPNA-6-00013 POC Annette E. Stevens, Contract Specialist, Thomas D. Genovese, Jr., (301) 427-2180 The NOAA Automated Surface Observing System (ASOS) program has a need for an All-Weather, Liquid and Frozen Precipitation Water Equivalent Accumulation Gauge. An alternative to tipping bucket technology is sought which meets the following performance requirements: (1) Range (i.e., measuring capacity) greater than or equal to 40 inches (mandatory), and greater than or equal to 60 inches (desirable), liquid water equivalent, unattended (without user intervention). (2) Resolution of 0.01 inch. (3) The accuracy of the gauge shall be linear over the entire operational range for temperature and wind, and shall meet the following requirements at the specified hourly precipitation rates (R): (a) R greater than 0 inch per hour and less than or equal to 1 inch per hour, plus or minus 0.02 inch; (b) R greater than 1 inch per hour and less than or equal to 10 inches per hour, plus or minus 0.04 inch; (c) R greater than 10 inches per hour and less than or equal to 20 inches per hour, plus or minus 0.1 inch; (d) R greater than 20 inches per hour, plus or minus 0.2 inch. (4) The gauge shall not report any change in accumulation in the absence of precipitation. (5) The gauge shall be fully compliant with accuracy requirements over the following operational temperature limits: (a) low temperature operational, minus 60 degrees F; (b) high temperature operational, plus 120 degrees F. Furthermore, the gauge shall survive exposure to the following temperature extremes with no damage: (c) low temperature withstanding, minus 80 degrees F; (d) high temperature withstanding, plus 130 degrees F. (6) The gauge shall be fully compliant with accuracy requirements over the following operational wind limits: (a) Operational steady wind, up to 30 knots; (b) Operational wind gust, up to 46 knots. Furthermore, the gauge shall survive exposure to the following wind extremes with no damage: (c) Withstanding steady wind, up to 73 knots; (d) Withstanding wind gust, up to 125 knots. (7) Reliability, Maintainability, and Availability: (a) Mean Time Between Failure, greater than or equal to 30,000 hours; (b) Periodic Maintenance interval, not less Than 90 days; (c) Mean Time To Repair, less than or equal to 30 minutes. Vendors may request a copy of the complete statement of work (including design requirements) from the contact person within 2 weeks of CBD issuance and should respond within 8 weeks of CBD issuance. (0152)

Loren Data Corp. http://www.ld.com (SYN# 0285 19960603\66-0001.SOL)