66--Mobile Weather Stations for SWRO Water Resources

Bureau of Indian Affairs Southwestern Regional Office Division of Natural Resources, Water Resources & Irrigation Specifications Mobile Weather Stations For ET measurements June 18, 2026 General Description: Research grade mobile weather station: Campbell, ET107 or similar • Mounting Tripod: Up to 10 feet, 3 meters height • Precipitation/Rain gauge (in or mm) • Temperature gauge (F° or C°) • Humidity sensor, relative humidity (RH%) • Wind Speed & direction gauge (mph or meters/s) • Solar Radiation Sensor (W/m2). • Data Logger, that can automatically Calculate Evapotranspiration using Penman-Monteith method. • Include all required mounting, calibration and power kits for sensors Data Logger: Cambell CR1000M or similar • Processor: CPU Drive: 50 MB serial flash, 2 MB flash, 7 MB RAM or greater. • Analog Inputs: 16 single-ended or 8 differentials individually configured input channels or more. Range: in (mV) +/- 5000 to +/- 2.5, Resolution: in (μV) 1333 to 0.67. • CPU Drive: 50 MB serial flash or greater • Data Storage: 50 MB serial flash or greater • Operating System: 2 MB flash • Settings, Calibration, TLS Certificates and Key, System Information: 3 MB serial flash or greater • Background Tasks and Table Information, Buffers, System Memory, Program Variables: 7 MB RAM or greater • Program Execution Period: 100 ms to 1 day • Resolution: 1 ms or lower • Accuracy: ±3 min. per year or greater Tipping Bucket Rain Gauge: Texas Electronics, TE525-5m TE525 or similar • Closure time: 135 ms or faster • Bounce settling time: 0.75 ms or lower • Resolution: 1 tip -- 1 of 2 -- Solar Radiation Sensor: Cambell, CS305-ET or similar • Spectral range: 300-1100 nm minimum • Measurement range: 0 to 2000 W/m2 or greater Humidity and temperature sensors: Cambell, HMP60-ETS or similar • Temperature Range: -40-60 °C or greater • Humidity Range: 0% – 100% • Temperature Accuracy: ±0.6 °C or greater • Humidity Accuracy: ±5 % (–40 °C to 0 °C), ±3 % (0 °C to 40 °C), for less than 90% humidity Wind Speed and Direction: Cambell, MW 034B-ET • Wind Speed Range: 0 to 75 m/s (0–167 mph) or greater • Wind Direction Range: 0° – 360° • Wind Speed Accuracy: Accuracy: <10.14 m/s: ±0.1 m/s (±0.25 mph) ≥10.14 m/s: ±1.1% of true speed or greater • Wind Direction Accuracy: ±5° or better Note all sensors must be compatible with the data logger and the mounting tripod and include all required mounting kits and power sources. -- 2 of 2 --