Statement of Work.pdf

Statement of Work

Project: A Nitrous Oxide Trace Gas Analyzer and a Carbon Dioxide Gas Analyzer with Compatible Smart Chamber

GENERAL INFORMATION

1.0 Scope of Work: Paired trace gas analyzers, compatible Smart Chamber (survey chamber), and necessary accessories (two analyzer T-split tubing, cable assembly, ten soil collars, backpack) are required for synchronous measurement of soil nitrous oxide (N2O) and soil carbon dioxide (CO2) emissions using recirculating closed and automated chamber systems. Smart chamber system connects with mobile device or laptop via the built-in Wi-Fi web server to see live flux data with trace gas analyzer.

The chamber will log GPS and ancillary data for flux measurements. Smart chamber survey system is completely self-powered by long-lasting batteries and is readily portable.

2.0 Background: Paired analyzers are sought to support synchronized soil N2O and soil CO2 gas flux research at the USDA-ARS National Laboratory for Agriculture and the Environment in Ames, Iowa. This institute currently lacks the capability to simultaneously measure N2O and CO2 fluxes, yet such capability would elucidate perceived interactions between nitrogen and carbon fluxes in Midwestern cropping systems. A smart chamber is necessary to ease and speed survey measurements for N2O and CO2 with the analyzers and is deemed necessary, especially, for in-situ field monitoring of these gases. Analyzers integrated with the smart chamber will fill a need for increased accuracy, repeatability, and speed of measurement and improved temporal resolution of N2O and CO2 flux measurements.

CONTRACTOR REQUIREMENTS

3.0 Technical Requirements/Tasks:

N2O Analyzer requirements

• Must provide measurements of N2O and H2O concentrations.

• Must be capable of rapid and precise measurement.

• Must provide stable measurements during movements typical of backpack mounted survey applications.

• Must allow an N2O measurement range of 0-100 ppm and precision (1 standard deviation) of 0.5 ppb with 1 second averaging and 0.2 ppb with 5 sec averaging.

• H2O measurement range of 0-60,000 ppm with precision (1 standard deviation) of

45 ppm at 10,000 ppm with 1 second averaging and 20 ppm at 10,000 ppm with 5 second averaging.

• Must have rapid response time for N2O measurements (< 4 seconds).

• Must operate under wide environmental conditions:

o Temperature: -20 deg to 45 degrees C o Sample humidity: 0-99.9% non-condensing relative humidity

• Instrument must be able to attain stated specifications when encountering elevated concentrations of H2O typical in static flux chambers deployed on surface soils in Iowa, USA.

• Must include a controller and embedded data logger

• Must be compatible with recirculating air systems for chamber flux measurement

• Must operate on AC or DC power with appropriate adapter

• Must be able to power with a battery.

• For field measurement, must provide low power draw, less than or equal to 180 W

• Must be designed for field use

• Must weigh less than 12 kg (batteries included) and reside in a compact crushproof case

• Dimensions of the N2O measurement unit must not be larger than 52 cm L x 34 cm W x 18 cm H

• Must include remote access and control capability

• Must be compatible with CO2 analyzer and allow real-time flux calculations with software

• Must include backpack for analyzer

• Qty:1

CO2 Analyzer requirements

• Must provide measurement of CO2 concentration.

• Must be capable of rapid and precise measurement.

• Must be powered by the lithium-ion battery installed inside the Smart Chamber

• Dimensions of the CO2 measurement unit must not be larger than 28.4 cm L ×

27.9 cm W × 12.4 cm H

• Must weigh less than 3 kg and reside in a compact crushproof case

• Measurement Rate: 1 measurement per second (1 Hz)

• Must operate under wide environmental conditions:

o Temperature: –20 to 45 °C o Sample Humidity: 0 to 95% RH, non-condensing relative humidity o Pressure: 50 to 110 kPa

• Must allow CO2 measurement range of 0 to 20,000 ppm with accuracy within 1.5% of reading

• Must be compatible with N2O analyzer and allow real-time flux calculations with software

• H2O measurement range of 0 to 60 mmol mol-1 with accuracy better than 1.5% of reading

Smart Chamber requirements

• The smart chamber must be compatible with trace gas analyzers and provide for survey sampling in conjunction with 8” diameter pvc collars.

• The chamber must provide for even mixing of the chamber headspace as it loops to the gas analyzer

• The chamber must have the ability open and close automatically using an internal bellows pump.

• The chamber must include an SDI-12 port for a Stevens Moisture Probe (included).

• The chamber must include an internal GPS.

• The chamber must include a Lithium-ion battery for powering the Smart Chamber and CO2 analyzer

• The chamber must contain a pressure vent to ensure the pressure between in the chamber and outside air is equal.

• The chamber must not close directly on the measurement collar to avoid perturbations in the sample.

• The chamber must include temperature and pressure measurements to enable onboard flux calculations from trace Gas Analyzers.

• The chamber must contain network time protocol (NTP) server for time synchronization to the analyzer.

• The chamber data files must be compatible with SoilFluxPro software for processing, evaluation, and visualization of soil gas flux data to allow easy editing, re-computation and visualization in a single data package.

• Interoperability and shared data processing pipelines of required analyzer and smart chamber are a critical requirement of this requisition to ensure data consistency and quality across lab projects.

• Qty: 1

Accessories:

• Two-analyzer T-split tubing is required to connect both trace gas analyzers with the smart chamber (Qty: 1)

• A cable assembly is required to connect trace gas analyzer to smart chamber that will allow re-circulating air flow and real-time data transfer between the analyzer and smart chamber (Qty: 1)

• A backpack capable of housing the trace gas analyzer during measurements and hands-free transport and carrying of the analyzer during measurements is required to enable survey measurements (Qty:1)

• PVC collars (8” diameter) with single beveled edge are required for anchoring trace gas measurements. Collars must be compatible with the smart chamber and be of adequate length to provide secure mounting of the collar in soil (Qty: 10).

4.0 Government Furnished: N/A

5.0 Deliverables/Schedule: Shall be delivered onsite within 120 days of date of award to: USDA-NLAE 1015 N. University Blvd Ames, IA 50011.

6.0 Evaluation Factors Lowest price technically acceptable.

7.0 Technical Point of Contact: Should there be technical questions, please contact Amitava Chatterjee, office: 515 294-8185 amitava.chatterjee@usda.gov