CoAgMet Stations Description

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

• Model: Campbell Scientific CR10
• Picture of a CR10 installation.

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