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
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