CoAgMet Stations Description

Colorado State Home Page USDA/ARS Home Page


This is the description of a typical CoAgMet station. Most stations have a similar configuration, but sensors, dataloggers and settings vary somewhat throughout the network.


Sensors

Temperature and Relative Humidity

  • Model: Vaisala HMP45C Probe
  • Sensor Height: 1.5 meters
  • Temperature Specs
    • Temperature Measurement Range: -35 to 50 °C
    • Thermistor Interchangeability Error: Typically <+-0.2 °C over 0 °C to 60 °C; +-0.4 °C at -35 °C
    • Polynomial Linearization Error: <+-0.5 °C over -35 °C to 50 °C
  • Relative Humidity Specs
    • RH Measurement Range: 0% to 100%
    • RH Accuracy (at 20 °C) +- 2%, 0% - 90%; +-3% > 90%
    • Temperature Dependence of RH Measurement: +-0.04% RH/°C

Wind

  • Model: R.M. Young Wind Sentry
  • Sensor Height: 2 meters
  • Wind Speed Specs
    • Range: 0-50 m/s
    • Starting Threshold: 0.5 m/s
    • Distance Constant (63% recovery): 2.3 m.
  • Wind Direction Specs
    • Range: 0-360 Deg. (355-360 open)
    • Starting Threshold 10° displacement: 0.8 m/s
    • Starting Threshold 5° displacement: 1.8 m/s

Solar Radiation

  • Model: Licor LI-200X Pyranometer
  • Specs
    • Sensor Height ~2m
    • Sensitivity: 0.2 kW m2 / mV
      • Spectral response from 0.4 to 1.1 mu
      • Typical error under natural daylight +-3%, maximum +-5%

Precipitation

  • Model: TE525 tipping bucket raingage
  • Specs
    • Sensor height >1m
    • Collector diameter - 154mm
    • 0.254mm/tip
    • accuracy +- 1% for precip of 50mm/hr or less
    • Operating temperature 0 to 50 °C (not accurate during winter)

Soil Temperature

  • Model: CSI Model 107 Soil Temp Probe (thermistor)
  • Specs
    • +- 0.4C for -33 to +48C all errors inclusive
    • Sensor depth 50mm and 150mm where two sensors used, 100mm where only one.


Data Loggers - Campbell Scientific CR10, CR10X and CR1000


Site Pictures

AVN01 PKH01 HYK02

 


Return to the CoAgMet Homepage.