In today's uneven distribution of water resources, more understanding of evapotranspiration (ET) can be of great help to water management. Among various techniques, eddy covariance is the most direct method of measuring evapotranspiration. The required eddy covariance measurement system is based on a sonic anemometer and a highly sensitive hygrometer with fast response frequency (e.g. 10Hz).
HealthyPhoton is introducing the new HT1800 TDLAS (Tunable Diode Laser Absorption Spectroscopy) Open-path Hygrometer designed for the eddy covariance method. Since the introduction of the HT8700 Open-path Ammonia Analyzer, we have gradually accumulated experiences in the development and application of instruments in the field of environmental monitoring. Our new HT1800 hygrometer has the open-path configuration that directly measures the moisture content of the atmosphere, ensuring the high accuracy and high speed of measurement. In terms of performance, the instrument fully satisfies the need in the eddy covariance method, and is indispensable in eddy covariance systems for ET analysis and flux corrections of other gas species.
Features and Benefits
• Light weight, low cost, easy installation and maintenance
• Ideal for eddy covariance and evapotranspiration measurements
• Open path configuration, with up to 20Hz measurement frequency
• Ultra-sensitive laser spectroscopy brings very low drift
• No cross-interference from CO2 and other gas molecules
• No moving parts with strong vibration resistance
• Robust design for versatile field deployment
• Low power (10 W) that can be supplied by a solar panel
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Detection Technology |
TDLAS (Tunable Diode Laser Absorption Spectroscopy) |
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RMS noise (1σ; 20Hz/10Hz/1Hz) |
7 ppm/ 5 ppm/ 2 ppm |
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Measurement Range |
0 - 60 mmol/mol or 0 - 60 pptv |
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User Interface |
Windows based software |
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Output Data Rate |
20 Hz/10 Hz/ 1Hz user configurable |
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Operating Pressure |
70 - 110 kPa |
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Operating Temperature |
-20°C ~ 50°C |
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Operating Humidity |
0 ~ 100% R.H. Non condensing |
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Data Communication |
RS-232 |
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Data Storage |
On-board storage with SD card or any data loggers with RS-232 communication interface |
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Power Requirements |
12 VDC |
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Power Consumption |
Typ. 10 W (max. 30 W at warm up ) |
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Dimensions |
Sensor Head: L450mm×ø90mm Control Box: 34cm x 30cm x 15cm TDL Cable: 3 m (between sensor head and control box) Power, RS-232, T/A Aux. Input: 3 or 5 m |
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Weight |
Sensor Head: ~2.5kg; Control Box: ~1.5kg |
Tel：+86-156-1892-2826 Email：info@healthyphoton.com
Add：Room 305, Building 1, Zhongchuang Science Park, Jinyuan Road, Panhuo Street, Yinzhou District, Ningbo City,China
