SOW_1_Dewpoint_Sensors_S100-2MT4A1A1-1 Nov 26 2024-R.docx

STATEMENT OF WORK 1 – DEWPOINT SENSOR

Statement of Work Repair and Recondition of the Automated Surface Observing System (ASOS) 1088 Dew-point Sensor

ASN: S100-2MT4A1A1-1, NSN: 6660-01-412-2335

Version: November 26, 2024

Description: The Contractor shall repair, recondition and paint the 1088 Dew-point Sensor to "Like New" operating condition, including cosmetic appearance in accordance with National Weather Service specifications. The repair, recondition and paint price shall include the parts, materials, labor, inspection and return shipping necessary to return the 1088 Dew-point Sensor to operational specifications. Repair materials or specifications differing from the NWS source specification must be approved by the National Weather Service prior to use.

Definition:

(a) Supplies: includes but is not limited to raw materials, components, intermediate assemblies, end products, and various supplies.

(b) Repair and Reconditioning: As outlined in Description of Work paragraph below.

(c) “Like New” Condition means reconditioned to the listed specification to meet all applicable electrical, mechanical, and cosmetic specifications and engineering documentation, including the replacement of damaged, missing, or non-functioning parts.

Government Furnished Equipment: None.

Government Furnished Data:

NWS Temperature Sensor—Range, Accuracy Resolution Specification

Parameter Range RMSE Max Error Resolution

Manufacturer’s System Specification

Overall System Accuracy

±1.0⁰F (ambient temperature -80⁰F through +130⁰F) ± 0.5⁰F (ambient temperature -58⁰F through +122⁰F)

Vendor Furnished Equipment: All parts and supplies needed to complete repairs. Any vendor who attempts to repair the 1088 Dew-point Sensors will need to provide all parts and supplies and any test fixtures required to complete repairs. A parts list and current pricing as of 1/1/18 has been provided by the OEM for most, if not all, parts within the assembly on the last page of this SOW. Parts that are industry standard parts and readily available from multiple suppliers can be purchased at the supplier of vendor’s choosing. Part substitutions, both electronic and mechanical, are not allowed at the discretion of the vendor. If original parts are not available from outside sources then parts must be purchased from the OEM: Technical Services Laboratory in order to maintain configuration management and device accuracy as purchased. One specific part that has not had the specifications provided or a commercial part number provided is the thermoelectric cooler. This part is a critical component of the overall operation of the device and will need to be procured from the OEM unless vendor can prove that they have received the specifications of this part from the OEM and are providing the same part from an alternate source. Substitutions are not allowed without NRC approval and will be cause for QC rejection.

Recommended Equipment and Supplies: None.

Description of Work – Work Procedures: Inspect the S100-2MT4A1A1-1, 1088 Dew-point sensor for major defects. If none found, proceed with the repair. If major defects exist that would prevent the repair of the unit, contact the National Reconditioning Center (NRC) for a replacement unit. The following steps may be accomplished in any order deemed necessary by the vendor. Steps may be skipped if not required.

Notes:

· Some of the 1088 Dew-point Sensors have a conformal coating on the main board. Repair of these units will require the vendor to remove the conformal coating, make the needed repairs and then re-apply conformal coating.

· Not every repair requires replacement of the mirrors, but may require the cleaning, polishing or potentially re-plating of the mirrors. In addition to replacement, any of these three methods of mirror refurbishment are acceptable based on the level of wear and tear that has occurred to the mirror. The repair vendor will need to develop this capability without help from the NRC.

The following is the basic process. The detailed procedures shall be developed by the vendor.

· Disassemble the unit.

· Clean parts as necessary to meet like new condition.

· Ensure cable/connector is clean and the cannon connector shell turns freely.

· Touch up or repaint painted parts as necessary with the current color.

· Remove the necessary components from the circuit board to allow repair.

· If the thermoelectric cooler is being replaced/repaired it must be re-soldered to the heat sink assembly. Use of heat sink paste as a replacement for soldering the thermoelectric cooler is not allowed nor is any other method of securing the thermoelectric cooler to the heat sink assembly i.e. the use of RTV or similar products.

· If the unit has conformal coating, it is not necessary to re-coat the circuit board with conformal coating.

· Reinstall removed components, replacing any that may be faulty. Reuse the optical bridge components, if appropriate. Replace if faulty.

· Replace the banana jacks for the fan power if necessary (must replace if corroded or broken).

· Reassemble and test the unit. Verify that unit operates within specifications.

· Make sure the serial number is visible on the unit.

Return repaired/reconditioned units to the NRC for acceptance.

Warranty Terms: Vendor will provide a 1-year warranty against material workmanship and against faults occurring during operation. This 1-year warranty will begin after passing the final equipment inspection and acceptance for stock.

NRC Final Acceptance: All repaired and reconditioned Dew-point Sensors will be inspected for material workmanship and tested for operational performance at the NRC. To meet the material workmanship requirements, the Dew-point Sensors will need to be in a “Like New” operating condition for example the unit’s paint job, cables (no insulation nicks or exposed wires), connectors and associated hardware. All soldering connections and connectors/pins will be inspected to ensure no corrosion is present and the correct parts are installed. Soldering and circuit board repair shall be in accordance with DOD-STD-2000 or commercial equivalent. Dew-point Sensor Circuit Boards shall have all solder connections environmentally sealed. The Instrument Inspection Unit will verify Dew-point Sensors meet operational requirements by testing each unit for proper and accurate functionality in a QC ASOS system. Units shall meet the ambient/dew-point temperature specifications noted above. QC Inspections will be conducted on, but are not limited to: thermo-electric coolers, mirrors, banana jacks, cannon plug, paint, and conformal coating of boards or environmental seals of solder connections. Any inspected item that does not meet acceptance criteria will be returned to the vendor for rework at no additional cost to the Government.

Deliverables: Each repaired and reconditioned Dew-point Sensor, by serial number, shall be supplied with a Repair Report documenting the repair, reconditioning, and inspection to include results of all tests and failure analysis.

Shipping Address:

NATIONAL RECONDITIONING CENTER (NRC) 14200 MERRITT RD.

GRANDVIEW, MO. 64030

Transportability: Vendor is responsible for returning repaired products in a shipping container designed to withstand the vibration and shock encountered during transportation by ship, rail, truck, and aircraft. The units shall be packaged to prevent damage to include: physical, electrical, mechanical, cosmetic, and the units shall not be damaged or lose performance capability.

Final Note: When unforeseen problems arise, that may need technical clarification, please contact the Contracting Official who will notify the NRC. If the unit has any problem that prevents a quality repair, do not work on the item until the issue can be resolved.

NRC Reviewed:

WSRB Repair Branch Review: Marcus Stevenson, Branch Chief, November 26, 2024 TI&MR Branch Review: Gregory Flores, Branch Chief, November 26, 2024

**Note: Prices listed are as of 1/1/18 and may fluctuate in the future at the discretion of the supplier.

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