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COMMERCE BUSINESS DAILY ISSUE OF FEBRUARY 21,1996 PSA#1535US Department of Commerce/National Oceanic and Atmospheric
Administration, 1325 East West Highway - Station 4301, Silver Spring,
Maryland 20910-3283 A -- PRECISION ELECTRONIC ANERIOD BAROMETER POC Norbert Szymanski,
(301)713-0839 The National Weather Service (NWS) is seeking sources to
provide a precision electronic aneroid barometer. The desired
barometer shall be sufficiently rugged so that conditions incident to
normal shipping, installation, use and service shall not affect its
serviceability, accuracy or stability. The unit shall be made of
suitable materials that will permit storage and use in natural weather
conditions. Subjection of the unit to pressures up to 1.2 times the
full scale shall not damage the unit or affect its performance. Units
shall be no larger than 43.18cm x 24.13cm x 20.32cm (w x l x h) and be
available in panel mounted and desktop cases. The maximum weight of
the unit will be less than 7 kg. The precision electronic aneroid
barometer shall sense and continuously display both the real-time
ambient atmospheric station pressure and the real-time ambient
atmospheric station pressure corrected to mean-sea-level using a common
transducer(s). Each individual numeral on the unit displays shall be no
less than 1.27 cm in height and shall be proportional and legible.
Displays shall have a multiple scale unit measurement selection, which
shall be prominently displayed to the right of the measurement.
Displayed resolution shall be to at least 6+ digits for all available
units of measurement. The precision electronic aneroid barometer unit
shall record and store the historic ambient atmospheric station
pressure for a period of 35 days. The 35-day period will be resettable
at any selected time interval less than 35 days and shall include a
timed sample mode selectable to a minimum 10 second interval and a
burst mode. The unit shall automatically sense rapid changes barometric
pressure and default to the burst sample interval. The burst mode shall
be ON/OFF selectable within the software. This data will be
continuously accessible via a display panel or computer interface, and
downloadable via a standard RS232 computer interface. The unit shall
not be sensitive to humidity or changes in air density and
automatically compensate for the effects of varying temperature. All
performance parameters shall be maintained over an operational external
temperature range of -20x to 50x C. The unit shall have an ambient
pressure range of 50 to 110 kPa minimum and an elevation range
adjustment with software restricted access for altimeter settings of -
50 to 3750 meters minimum. Accuracy of the unit shall be 0.01 % of
full scale (FS) or better in any unit position or configuration, drift
shall not exceed 0.005% FS per year and hysteresis shall not exceed
0.005% FS. Active supplemental devices to control the barometric
transducer units~ physical environment shall not be used. The
barometric transducer(s) shall be field replaceable, easily removed and
replaced. The unit shall operate from a standard +115 q 10 VAC power
outlet, have internal surge protection and be capable of maintaining
unit power requirements for a minimum of 36 hours if facility power
should fail. A warmup time of less than 1 minute shall be required to
full operational status. The unit shall perform continuous self-tests
to ensure proper operation of all systems. A minimum of one 9-pin RS232
serial port and one optional variable baud modem with a standard 4-wire
RJ11 connector shall be available on the standard unit. All units shall
be upgradable to support additional 9-pin RS232 serial ports for an
ancillary input. Personal computer interface software shall be provided
by the manufacturer for on-site and remote programing and
interrogation. The software shall accept data input in multiple forms,
manual input on the standard unit and automatic input from external
sensors available through a menu option on upgraded units. The unit
shall provide a method to enter the Pressure Reduction Ratio ~r~ as
calculated from NWS station tables and optionally enter the current
temperature (T0) and the temperature twelve hours previous (T-12) and
optionally allow an external temperature transducer to log (T0) and
(T-12). The software shall then be able to read or calculate the
Pressure Reduction Ratio ~r~ as entered or programed for a station and
determine the sea-level pressure. The unit shall also provide a method
to compute and display the Pressure Altitude, and the Density Altitude
with the input of current temperature. Temperature input from an
external temperature transducer(s) is a required future option, but for
many reasons will not be included in the initial procurement of this
unit. Reprogramming for this option shall not be necessary. To request
a copy of the Draft Specification, submit a written request to:
Department of Commerce/NOAA, National Weather Service, Attn: Al
Wissman,W/OSO321, M/S 3396, 1325 East West Highway, Silver Spring, MD
20910. The anticipated initial purchase will be for 100-130 units with
the purchase of more units and upgrades possible. It is expected that
if several responses are acceptable, a prototype unit(s) from more
than one manufacturer will be purchased and evaluated. The final bulk
production purchase will be from only one manufacturer. Requests for
Draft Specifications will be honored for 30-days after publication of
this notice. Technical and cost proposals will be honored for 60-days
after publication of this notice. (0047) Loren Data Corp. http://www.ld.com (SYN# 0006 19960220\A-0006.SOL)
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