Relative Humidity, Barometric Pressure, Air Temperature, and Vapor Pressure with or without a passive radiation shield.
Use the rugged VP-4 sensor with soil moisture probes in microclimate and evapotranspiration studies
|RANGE||0 to 100% RH|
|ACCURACY||Sensor measurement accuracy is variable across a range of temperatures.
Refer to the chart in Figure 1 to determine the accuracy specification for the VP-4 sensor.
|< 40 s (response time in 1 m/s air stream)|
|HYSTERESIS||< 1% RH typical|
|LONG TERM DRIFT||< 0.5% RH/year typical|
|RANGE||-40°C to 80°C|
|ACCURACY||Sensor measurement accuracy is variable across a range of temperatures. Refer to the chart in Figure 2 to determine the accuracy specification for the VP-4 sensor|
|< 400 s (response time in 1 m/s air stream)|
|LONG TERM DRIFT||< 0.04°C / year typical|
|RANGE||0 to 47 kPa|
|ACCURACY||Sensor measurement accuracy is variable across a range of temperatures and RH. Refer to the chart in Figure 3 to determine the accuracy specification for the VP-4 sensor.|
|RANGE||49 to 109 kPa|
|DIMENSIONS||1.96 cm (dia) x 5.4 cm (h)|
|POWER REQUIREMENTS||3.6 to 15 VDC, 0.03 mA quiescent, 4 mA during 300 ms measurement|
|RESPONSE (MEASUREMENT) TIME||300 ms|
|OUTPUT||Decagon Digital or SDI-12|
|OPERATING TEMPERATURE||-40°C to 80°C|
|CONNECTOR TYPES||3.5 mm (stereo) plug or stripped and tinned lead wires (pigtail)|
|CABLE LENGTH||5 m standard; custom cable length available upon request|
|DATA LOGGER COMPATIBILITY
|Decagon: Em50 Series (Firmware 2.19+)
ICT SDI-12 logger, AML, AWS, Universal Telemetry Hub
Campbell Scientific: Any logger with serial I/O
|HANDHELD READER COMPATIBILITY||ProCheck (rev 1.57+)|
|SOFTWARE COMPATIBILITY||ECH2O Utility (rev 1.74)
DataTrac (rev 3.11+)
Integrate into non-Decagon data loggers with the easy-to-use SDI-12 communication protocol.
This 5 cm x 2 cm sensor is able to fit into the smallest of spaces.
Thanks to its unique Teflon screen, the relative humidity sensor can survive a deluge. Naturally, it won’t be transmitting accurately while waterlogged; but as soon as it has dried out, it’s back in the game.
The Teflon screen protects the sensor from liquid water and dust without limiting diffusion of water vapor. The protected sensor is still able to quickly respond to changes in humidity.
Integrated Temperature for Accuracy
Accurate relative humidity readings require accurate air temperature readings taken at the same place and time. This sensor takes both measurements simultaneously for the best possible accuracy.
Radiation Shield Included
The included radiation shield is designed to improve air temperature readings by minimizing radiation and maximizing airflow over the surface of the sensor. Specially designed to preserve the correlation between actual air temperature and sensor air temperature while keeping the shield size small.