Relative Humidity, Barometric Pressure, Air Temperature, and Vapor Pressure with or without a passive radiation shield.
Use the rugged ATMOS 14 sensor with soil moisture probes in microclimate and evapotranspiration studies.
Note: The Decagon VP-4 has been replaced by the Meter ATMOS 14.
If you’re doing a microclimate or evapotranspiration study, you may need up to four extra sensors to get important measurements that will benchmark your data. Not to mention you have to face the hassle of getting all those sensors integrated into your system. What you need is something simpler. With this in mind, we engineered the ATMOS 14 to be four sensors in one—air temperature, relative humidity, barometric pressure, and vapour pressure.
Thousands of engineers and ecologists already depend on the ATMOS 14 for straightforward measurements. Whether you’re using the EM60G to look at plant emergence, leaf area index, or fractional interception, there isn’t an easier way to benchmark your data. The ATMOS 14 is a versatile, low-maintenance, and fast sensor designed to make taking temp/RH measurements simpler and therefore less work.
Despite its minimalist design, the ATMOS 14 provides maximum value. While other sensors require wiring and programming, the ATMOS 14 simply plugs into the EM60G (It’s also compatible with third-party data loggers). There’s no having to figure out complicated instructions. Just mount the sensor on your data logger mast, plug it in, and walk away.
The ATMOS 14 is low-maintenance. It gives accurate vapour pressure and RH without a lot of cleaning. Plus it’s weatherproof, meaning it will last a long time in the field. Another helpful feature is the compact shape that fits into tight spaces, leaving room on a mast for other sensors.
Because the ATMOS 14 is plug and play, setup is quick. And responses are equally fast. Thanks to a Teflon protection screen that keeps liquid water out, but vapour moving freely through, it responds rapidly while keeping dust and liquid water off the sensor. Both features add up to time saved on your part.
With ATMOS 14, all your basic microclimate measurements are covered using a small, simple integrated sensor. This versatile, low-maintenance sensor will rapidly and reliably measure air temperature, relative humidity, barometric pressure, and vapour pressure, making benchmarking quick and hassle-free.
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 vapour. 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 minimising radiation and maximising 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.
|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 ATMOS 14 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
|Meter/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+)