ATH Temperature and Relative Humidity Sensors
Overview
Features
Details
Specifications
Case Studies and Downloads
Overview
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.
Features
Details
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.
Specifications
All versions of the ATH-2 include a replaceable calibration chip, cheaper than recalibration.
| ATH-2A | ATH-2S | ||
| Temperature | Range | -40 to 60 deg.C | -40 to 60 deg. C |
| Output Sensitivity | 10mV / deg.C | ||
| Accuracy | ±0.15 °C | ±0.15 °C | |
| Humidity | Range | 0 to 100% | 0 to 100 % |
| Output Sensitivity | 10mV/% | ±2% | |
| Accuracy | ± 2% | ± 2% | |
| General | Sensor Output | Analogue Voltage | SDI-12 |
| Power Requirements | 5.5 to 16V; 3 mA | NA | |
| Start-up Time | 1sec | NA | |
| Size | ø20 x 81 mm | ø20 x 81 mm | |
| Mesh Screen | 40 µm PE | Stainless Steel |
Case Studies and Downloads
