Attachment 1 Specifications.pdf
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- Attached to
- Carbon Flux Sensor and Tower Federal contract opportunity
- Solicitation number
- 1232SA26Q1354
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Summary of Attachment 1 Specifications - Carbon Flux Sensor and Tower
This document is a technical specification attachment for a USDA procurement of a carbon flux sensor and tower system to be deployed in Stoneville, Mississippi. The USDA seeks a single, compact, state-of-the-science carbon flux sensor and accompanying 5-meter minimum mast tower for real-time monitoring of crop growth in large-scale farmers' fields. The system must measure CO₂, latent heat, sensible heat, and momentum fluxes, along with ancillary biometeorological measurements including Photosynthetic Photon Flux Density, air temperature, relative humidity, and barometric pressure. The sensor must feature integrated gas analyzer and ultrasonic anemometer capabilities with raw (10 Hz) and processed data output via serial and SDI-12 protocols. Solar panels must be designed to attach to the mast for power generation, with the entire system configured as a single mast installation to minimize crop disturbance.
The required minimum salient characteristics specify an open-path, non-dispersive infrared (NDIR) analyzer with high-speed CO₂ and H₂O measurements up to 20 Hz for eddy covariance applications. The sensor must achieve CO₂ range of 0–3000 µmol mol⁻¹ with ±1% accuracy and H₂O range of 0–60 mmol mol⁻¹ with ±2% accuracy. The optical design must include a 12.5 cm optical path, 16 cm³ cell volume, temperature-controlled source and detector, scratch-resistant sapphire windows, and brushless chopper motor. Environmental robustness requirements include continuous operation capability in rain, snow, and fog with operating temperatures from –25 to +50 °C and IEC IP65 weatherproof certification. The system must integrate with 3D sonic anemometers, LI-COR Biomet sensors, and the LI-7700 CH₄ analyzer, while supporting SmartFlux® and EddyPro® software platforms with Ethernet, RS-232, SDM, and analog output options. Power consumption specifications are 30 W during warm-up and 8–18 W steady-state, with the analyzer head weighing 1.8 kg and the LI-7550 interface plus cables weighing 4.4 kg.
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| Attachment 3 Provision 52.225-18 Place of Manufacture.pdf | ||
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Text version
Attachment 1 Specifications
Carbon Flux Sensor and Tower
Stoneville MS
1.0 Scope
The USDA requires a single compact, state of the science Carbon Flux Sensor and tower for deployment in large-scale farmers’ fields for real-time monitoring of crop growth (crop canopy scale photosynthesis and carbon assimilation) by measuring fluxes of CO2, latent heat, sensible heat, momentum, and includes ancillary biometeorological measurements including Photosynthetic Photon Flux Density (PPFD), air temperature, relative humidity, and barometric pressure. Flux-data processing occurs on the sensor itself, with integrated gas analyzer and vertical (W), and two horizontal wind speed (U, V) components measured by an integrated ultrasonic anemometer. Raw (10Hz) and processed data are output via serial and
SDI-12. Mast for installation and cables for the sensors should be minimum 5 m (above ground). Solar panels need to be designed to attach to the mast for generating the power required for operating the sensors. Single mast system with no cross arm requirements for installation in farmer-field with minimum disturbance to crops. The product must meet or exceed the minimum salient characteristics outlined below.
2.0 Required Minimum Salient Characteristics
2.1. Measurement Capabilities
• High-speed CO₂ and H₂O measurements up to 20 Hz for eddy covariance applications.
• Measures true mole fractions using fast, synchronized temperature and pressure measurements of sampled air.
• CO₂ range: 0–3000 µmol mol⁻¹; accuracy within 1% of reading.
• H₂O range: 0–60 mmol mol⁻¹; accuracy within 2% of reading.
2.2. Optical and Mechanical Design
• Oen-path, non-dispersive infrared (NDIR) analyzer with a 12.5 cm optical path and 16 cm³ cell volume.
• Temperature-controlled source and detector for stability under large ambient temperature swings.
• Scratch-resistant sapphire windows and contamination-resistant optics for dusty or harsh environments.
• Brushless chopper motor for long-term reliability.
2.3. Environmental Robustness
• Designed for continuous operation in rain, snow, and fog, minimizing data gaps.
• Operating temperature: –25 to +50 °C (–40 °C verification available).
• Weatherproof to IEC IP65 standards.
2.4. Frequency Response & Sampling
• Gas sampling rate: 150 Hz; selectable bandwidths of 5, 10, or 20 Hz.
• High-frequency response maintained with insulated or heated intake tubes (optional).
• Air intake can be positioned to minimize flow distortion near the sonic anemometer.
2.5. Integration & Data Systems
• Integrates with 3D sonic anemometers, LI-COR Biomet sensors, and LI-7700 CH₄ analyzer for complete flux systems.
• Compatible with SmartFlux® for real-time on-site flux computation using EddyPro®.
• Outputs: Ethernet, RS-232, SDM, and analog outputs.
2.6. Power & Physical Characteristics
• Power consumption: 30 W during warm-up, 8–18 W steady-state depending on ambient temperature.
• Weight:
o Analyzer head: 1.8 kg o LI-7550 interface + cables: 4.4 kg
• Compact head: 7.5 cm diameter × 31 cm length.
2.7. Quality assurance:
• High stability with minimal drift due to temperature-regulated optics.
• All-weather reliability for long-term deployments.
• Fast, accurate flux measurements with synchronized T/P sensing.
• Low maintenance due to contamination-resistant design.
• Seamless integration into full eddy covariance systems with real-time processing.
End
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