NOAA: Relative Humidity Calibration Standard built to Specifications

Statement of Work 142082-26-0391 Relative Humidity/Dewpoint Primary Standard Replacement The National Weather Service Sterling Field Support Center (SFSC) Temperature and Humidity Laboratory (HTL) provides internal calibration for 16 humidity probes as well as accuracy testing services for programs testing new humidity sensing equipment. In order to provide accurate calibrations, the use of an accurate relative humidity/dewpoint standard is required. The primary calibration and testing standard currently used by SFSC is reaching the end of its life cycle. Staff have noted a dramatic increase in the number of failures that the system has experienced over the past few years. These failures often require that the unit be returned to the vendor for repair. This can be costly and often results in long periods of time that the unit is not available for use, increasing laboratory downtime, and decreasing testing availability for NWS programs. A replacement dewpoint refence must be purchased to reduce laboratory downtime and equipment repair costs while allowing for laboratory redundancy for a short period of time while the original unit is still functional to ensure installation and integration time for new equipment. Performance Criteria The equipment requirements listed below must all be met for the final acceptance of the system.  Number of Equipment to meet Performance Criteria: Maximum of two pieces of equipment o 1 to 2 pieces of equipment to meet full Sensor Measurement Requirements for Dew/Frost Point Range and RH Measurement Range. All other Sensor Measurement requirements must apply to both units if more than one unit is used.  Sensor Measurement Requirements: o Dew/Frost Point Measurement Range: Equal to or better than -62°C to 54°C o Dew/Frost Point Accuracy (Max): +/- 0.1°C o Reproducibility (Max): +/- 0.05°C o RH Measurement Range at 20°C: 1 – 100% o Display Resolution: Less than or equal to 0.01°C o ppmv, minimum: 2.5  Heated Hose Length: Must include a heated hose for gas sampling with minimum length of 55 inches  Heated Hose Diameter: Must fit inside of a port hole with a 1.874 inch diameter  Display: Front facing Digital Display  Temperature Probe: PT100 Class A or equivalent  Sample gas circuit: 316L stainless steel, electropolished or high quality PTGE -- 1 of 2 --  Dimensions (Max): Width 20in x Height 12in x Length 24 in  Weight (Max): 75 lbs  Power Source: 100 to 120 VAC, 50/60HZ  Serial Communications Requirements: Must possess the ability to receive text strings sent from a third-party terminal program such as Hyper Terminal or PuTTy. Must have the ability to send text strings to a third-party terminal program containing information about the current measurement readings.  Calibration Interval: 1-year minimum calibration interval  Environmental Operational Requirements: o Temperature Range: Must be capable of operating in a standard laboratory environment with a temperature range of 15°C to 35°C o Ambient Humidity Range: Must be capable of operating in a standard laboratory environment with a RH range of 20% - 70% RH  Calibration Requirements: Each unit must come with an ISO-17025 Accredited Calibration with a Calibration Certificate and Sticker for every unit  Maintenance: Maintenance costs minimized  Shipping: Shipping Cost included Inspection and Acceptance Upon completion, contractor shall notify the Government representative for approval and acceptance. The acceptance period will include a full successful demonstration in accordance with vendor supplied accepted test plan with the federal representative signature. Delivery of acceptance test results from the test plan must be submitted with invoice for processing and approval of payment. Delivery/Point of Service to be Completed, if applicable: Sterling Field Support Center 43741 Weather Service Rd Sterling VA, 20166 National Weather Service POC: Kathryn Franc kathryn.franc@noaa.gov 301-388-8565 -- 2 of 2 --