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COMMERCE BUSINESS DAILY ISSUE OF APRIL 11, 1995 PSA#1322U.S. Geological Survey, 12201 Sunrise Valley Dr., MS 205B, Reston, VA
22092 66 -- ENERGY BALANCE SYSTEM SOL 8130 POC Contact -- Karen Phillips
(703)648-7372 (contact), Annamaria Ashworth (703) 648-7371 (CO) This
procurement is anticipated to be non-competitive as Radiation and
Energy Balance Systems, Inc. of Seattle Washington is the only know
source for this type of equipment. Requirements include: Purchase of
six Bowen-Ratio Energy Balance Systems to be used for measurement of
actual evapotranspiration. The system must be capable of continuously
measuring actual evapotranspiration in humid climates. The systems must
possess unbiased gradients of air temperature and vapor pressure energy
balance calculations. The system must use an automatic exchange
mechanism for SEBS, to obtain unbiased gradients of air temperature
(with the resolution of the temperature sensors mentioned above) and
unbiased gradients vapor pressure (with a resolution of 0.2 kPa or
better, depending upon the temperature senor used). In addition, the
temperature-humidity probes offerd by must force omni direction
aspiration and have double concentric cylindrical radiation shields to
assure the measurement of true air temperature and humidity in full
sun light. Vapor pressure errors due to condensation problems must not
exist. Separate sensors shall be used for determining air temperature
and temperature of the humidity cavity. This is absolutely essential
for determining true air temperature and vapor pressure gradients. The
temperature and humidity differences shall be measured between two
heights. The apparatus to hold the sensors must allow height
separations of up to 2.0 m and a minimum height that can be varied
between 0.2 and 1.0 m above the underlying soil or vegetation surface.
Provision shall be made for height adjustments, as may be required due
to changing vegetation height. The system shall be fully automated to
exchange sensor positions every 15 minutes (or other preselected time
interval) with control from on-board data acquisition system. The data
logger and control panel shall be housed in a weather tight box which
is located inside a radiation shield. Data system and sensors shall be
shipped prewired and programmed to immediately start operation when a
battery is connected. The system shall be field tested for at least 24
hours prior to shipment. All sensors wires shall be shielded and
enclosed in conduit for protection against animal and weather damage.
The system shall be designed to operator from a 12 volt battery and a
53 watt solar panel with voltage regulator. Delivery of the equipment
to Altmaonte Springs, Florida is anticipated to be completed within 60
calendar days after the contract award. Responses will be evaluated
for the ability to provide the required equipment as described above.
This notice is for informational purposes only--Request for Proposal
(RFP) is not available--This notice represents the Government's only
official notice of this contract action. Note 22 is incorporated by
reference however, the 45 day timeframe within that note is changed to
require responses by April 28, 1995. (0097) Loren Data Corp. http://www.ld.com (SYN# 0367 19950410\66-0001.SOL)
66 - Instruments and Laboratory Equipment Index Page
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