RFP_Attachment A - Specification Sheet.docx

Attachment A – Specification Sheet

SPECIFICATION SHEET

for the

VISIBILITY PRESENT WEATHER SENSOR

November 15, 2024

1. Requirements

1.1. General Requirements

[METRIC-1] The visibility present weather sensor must be a must be a commercial off-the-shelf (COTS) or non-developmental item (NDI) configured with combined visibility and present weather sensors capable of National Electrical Manufacturers Association (NEMA) 4X or better rating for outdoor installation.

[METRIC-2] Technical operations and maintenance must be supplied for the visibility present weather Sensor in an editable electronic format with permission for the Government to use for training/maintenance purposes.

[METRIC-3] Surrounding Obstructions: The visibility present weather sensor must be able to meet the siting requirement specified in FCM-S4-2019.

[METRIC-4] The visibility present weather sensor must come with an installation kit containing ALL necessary power cables, data cables, hardware and other ancillary pieces necessary to install the unit.

1.2. Self-Testing/Diagnostic Capability

The maintenance philosophy of the ASOS is to maximize the ability of today’s “smart” sensors to perform continuous built-in tests or self-reporting capable of detecting and reporting internal anomalies and/or failures which adversely impact reporting accuracy. The Government will maximize this built-in test capability as a goal, the visibility present weather sensor will be capable of identifying and fault-isolating all sensor-specific hardware and software anomalies.

[METRIC-5] The Contractor shall identify the extent to which the visibility present weather sensor can provide these capabilities and must provide an interface document which details all communication and message formats relevant to this capability.

[METRIC-6] Off-line extended diagnostic procedures and tools shall be provided for faults that cannot be detected by the self-testing/diagnostic capability. The off-line extended diagnostics are diagnostic procedures designed to be performed through external commands received via a maintenance technician laptop computer. These diagnostic procedures may make use of extensive dialogue with the maintenance technician and may use commonly available external test equipment and/or common hand tools if required.

1.3. Visibility Performance Requirements

[METRIC-7] The visibility present weather sensor must report Meteorological Optical Range (MOR) with a reporting range from 10 meters (m) through a minimum of 20,000 m.

[METRIC-8] For ranges from 10 m to 5,000 m, the visibility present weather sensor must report MOR with a minimum resolution of at least 1 m.

[METRIC-9] For ranges >5,000 m, the visibility present weather sensor must report MOR with a minimum resolution of at least 10 m.

[METRIC-10] The visibility present weather sensor must report MOR with accuracy of ±10% for MOR measurements less than 10,000 m and ±20% for MOR measurements greater than 10,000 m.

[METRIC-11] The visibility present weather sensor must have the capability to report day/night status using a luminance sensor (photometer). The photometer must indicate day for illumination levels greater than 3 foot-candles (FC) and night for illumination levels less than 0.5 FC. Transition from indicating night to indicating day must occur once in the region between 0.5 and 3 FC as illumination increases. Transition from indicating day to indicating night must occur once in the region between 3 and 0.5 FC as illumination decreases.

1.4. Present Weather Performance Requirements

Table-Present Weather Phenomena Requirements for Surface Observations

Tornado3 Waterspout3

UP Unknown Precipitation4

General Note: The weather groups must be constructed by considering columns 1 to 5 in sequence, that is, intensity, followed by description, followed by weather phenomena, for example, heavy rain shower(s) is coded as +SHRA.

1 To denote moderate intensity, no entry or symbol is used.

2 See Paragraph 9.7 for vicinity definition and paragraph 13.13(1) for usage.

3 Tornadoes and waterspouts are coded as +FC.

4 "UP" is only used by automated weather observing systems.

For surface observations from FAA JO 7900.5E, Surface Observations. ASOS present weather sensors report a subset of the phenomena listed in table 3. Table is for contextual information only.

1.4.1. Present Weather/Precipitation Identification

[METRIC-12] The visibility present weather sensor must be capable of automated detection and reporting of Rain, Snow, Drizzle, Hail, Snow Pellets and Ice Pellets occurring individually.

[METRIC-13] The visibility present weather sensor must be capable of automated detection of the absence of precipitation (clear).

[METRIC-14] The visibility present weather sensor must be capable of automated detection and reporting of up to three (3). concurrent precipitation types listed in [METRIC-12].

[METRIC-15] The visibility present weather sensor must be capable of automated detection and reporting to determine precipitation onset and cessation.

[METRIC-16] Dominance-Based Reporting. During periods of Mixed-Phase Precipitation, the visibility present weather sensor must report the precipitation types, in order of decreasing dominance, per JO 7900.5E or by specifying additions and/or deviations in determining dominance per JO 7900.5E.

1.4.2. Precipitation Intensity Identification

[METRIC-17] The visibility present weather sensor must have the capability for sensor-deduced intensity for each precipitation type.

1.5. Firmware/Software Upgradability

[METRIC-18] The visibility present weather sensor must have the capability to allow for the upgrade to the sensor’s firmware/software.

1.6. Physical Interface Requirements

[METRIC-19] The standard physical mounting interface is 1011-3, 3x7.5 galvanized threaded flange mounted on a three-inch pipe standing 18” above the ground.

[METRIC-20] The visibility present weather sensor must physically interface with the standard ASOS pedestal using 316 or better stainless-steel bolts, washers, (lock washers), and lock-nuts. Additional mounting interface drawings are available upon request.

1.7. Interface Requirements

[METRIC-21] The visibility present weather sensor must be capable of interfacing with a datalogger.

[METRIC-22] The visibility present weather sensor must have a built-in asynchronous data interface mode capable of an SDI-12, RS-232 or RS-485 or ethernet (RJ-45) interface with user-selectable baud rate, parity, data bits, and stop bits.

1.8. Interrogation Rate

[METRIC-23] The visibility present weather sensor must have a configurable interrogation rate of at least ten seconds.

1.9. Power Requirements

[METRIC-24] The visibility present weather sensor must operate using a power supply that operates with either an input of 115 VAC ± 10%, 60 ± 5 Hz, single phase power OR DC power.

1.10. Logistics

[METRIC-25] The visibility present weather sensor must have a demonstrated hardware Mean Time Between Failure in excess of 10,000 hours (417 days).

[METRIC-26] The visibility present weather sensor must have a life cycle supportability of at least 20 years.

1.11. Environmental Requirements

1.11.1. Temperature

[METRIC-27] The visibility present weather sensor must be able to maintain operations in temperatures up to 120o F.

[METRIC-28 The visibility present weather sensor must be able to recover operations from temperatures up to 130o F.

[METRIC-29] The visibility present weather sensor must be able to maintain operations in temperatures down to -40o F.

[METRIC-30] The visibility present weather sensor must be able to recover operations from temperatures down to -80o F.

[METRIC-31] The visibility present weather sensor must be able to maintain operations in temperature shock conditions dropping from 70o F to -40o F.

[METRIC-32] The visibility present weather sensor must be able to recover operations from temperature shock conditions dropping 70o F to -80o F.

[METRIC-33] The visibility present weather sensor must be able to maintain operations in temperature shock conditions increasing from 80o F to 120o F.

[METRIC-34] The visibility present weather sensor must be able to recover operations from temperature shock conditions increasing 80o F to 130o F.

1.11.2. Humidity

[METRIC-35] When operating in ambient air temperature conditions less than or equal to 80oF, the visibility present weather sensor must operate without performance degradation in ambient relative humidity conditions up to 100% RH.

[METRIC-36] When operating in ambient air temperature conditions within the range of 81oF to 95oF, the visibility present weather sensor must operate without performance degradation in ambient relative humidity conditions up to 95% RH.

1.11.3. Wind

[METRIC-37] The visibility present weather sensor must operate without performance degradation when exposed to one-minute sustained average wind speeds up to 43 knots.

[METRIC-38] The visibility present weather sensor must operate without performance degradation when exposed to one-second wind gusts up 62 knots.

1.11.4. Rain

[METRIC-39] The visibility present weather sensor must operate without performance degradation when exposed to rain falling at a rate of up to 3-inches per hour with up to 30-knot wind speed conditions.

[METRIC-40] The visibility present weather sensor must be able to recover operations from rain conditions of up to 5 inches per hour with 73-knot winds.

1.11.5. Freezing Rain

[METRIC-41] The visibility present weather sensor must be able to maintain operations in freezing rain conditions of ice accretion up to 0.5 inches per hour up to 1.0 inches with 20-knot winds.

1.11.6. Other Environmental Elements

[METRIC-42] The visibility present weather sensor must be able to maintain and recover operations from exposure to dust conditions up to 5.0 mg/ft3 with winds of 2.6 knot to 4.3 knots

[METRIC-43] The visibility present weather sensor must be able to maintain and recover operations from exposure to atmospheric pressures as low as 15.7 inches of Hg.

[METRIC-44] The visibility present weather sensor must be able to maintain and recover operations from exposure to the electromagnetic environment of a typical airport.

[METRIC-45] The visibility present weather sensor must be able to maintain and recover operations from exposure to salt fog characteristic of a typical marine environment.

2. Quality Assurance Provisions

The visibility present weather sensor must comply with this specification when installed in all environments defined in this specification. The Government may verify compliance with the requirements of this specification in general, and the following sub-paragraphs, using various testing methods. These methods may include field tests wherein the visibility present weather sensor is exposed to outdoor environments and compared to a NWS standard, as well as possible rigorous laboratory testing wherein the visibility present weather sensor will undergo exposure to an artificial environment specifically designed to demonstrate visibility present weather sensor performance.

The Contractor must demonstrate, through a formal test and inspection program or from actual field use statistics that the visibility present weather sensor and its components meet the functional, environmental, reliability, maintainability, and availability requirements specified herein to the greatest extent possible.

3. Delivery Schedule

The contractor must coordinate with the government for the scheduled delivery of units post award to verify configuration to be delivered and enable the government to receive stock items contained in the field modification kit. An example of this would be placing an order, beginning to receive units at FOB destination within six (6) months of delivery order; with the remainder of the order to be delivered on a negotiated schedule that can be up to twelve (12) months in the future. Vendors must invoice for partial deliveries so they can be paid for units delivered and accepted.

Vendors must state their full rate production capacity in relation to the order volumes in table 1-1 and under no circumstances will orders take more than one year to fulfill.

4. Warranty

The warranty shall begin upon government acceptance at FOB destination. Units will be received and processed into the Quality Control (QC) section at the National Reconditioning Center. Once cleared by QC they will be entered into stock ready for issue. Clearing QC starts the warranty period and provides the contracting officer’s representative the authorization to pay the invoice for units received.

The duration of the warranty shall be a minimum of two years from the date of acceptance.