ATH Temperature and Relative Humidity Sensors

The ATH-2 range of temperature and humidity sensors are easy to maintain, with an exchangeable calibration chip to ensure accurate and reliable measurements over time. Available with either an analogue (ATH-2A) or SDI-12 (ATH-2S) output, these sensors are ideal for long-term installations.

Humidity and temperature sensors available today come in varying degrees of quality – in ease of long-term maintenance, stability and durability. In response to the experiences of researchers and customers, the ATH-2A and ATH-2S were developed to have greater instrument accuracy, easier upkeep, and an extended life. These sensors are ideally suited to in-canopy measurement and for use in calculation of Vapour Pressure Deficit.

Questions of long-term drift and recalibration are often overlooked when purchasing a sensor. Drift is inevitable, and is caused by several factors including vibration, environmental contamination, or extreme temperature fluctuations. Previously, reducing inaccurate measurements (caused by sensor drift) meant undertaking a regular, time-consuming, preventative maintenance calibration program. The unique design of the ATH-2S and ATH-2A addresses these problems at the core – providing a user replaceable sensing chip which can be installed onsite with no downtime or return to manufacturer required.

The ATH-VPD additionally incorporates the following calculated values:

• Measured:
  • Temperature °C.
  • Air Humidity %.
  • Air Pressure Pa.
• Calculated:
  • Dew point °C.
  • Water vapor density g/m3.
  • Vapor pressure deficit Pa.
  • Saturated vapor pressure Pa.
  • Actual vapor pressure Pa.

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