1 / 9

USCRN Soil Moisture/Temperature Workshop March 3-5, 2009 Oak Ridge, TN

USCRN Soil Moisture/Temperature Workshop March 3-5, 2009 Oak Ridge, TN. Temperature characterization of the Hydra II. Tilden Meyers NOAA/OAR/Air Resources Lab. Objectives With the new extended temperature range, characterize the overall accuracy of the Stevens Hydra II from -30 to +50 C

juannguyen
Download Presentation

USCRN Soil Moisture/Temperature Workshop March 3-5, 2009 Oak Ridge, TN

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. USCRN Soil Moisture/Temperature Workshop March 3-5, 2009 Oak Ridge, TN Temperature characterization of the Hydra II Tilden Meyers NOAA/OAR/Air Resources Lab

  2. Objectives • With the new extended temperature range, characterize the overall accuracy of the Stevens Hydra II from -30 to +50 C • Examine the repeatability of the results • Examine the consistency from probe to probe

  3. Methodology Use the USCRN temperature calibration system to evaluate the performance of 3 Hydra II extended temperature range probe. System has NIST traceable PRT's and capable of calibrating from -60 to 60 C

  4. Used the output of the SDI-12 reported temperature, which was determined from the traditional Steinhart-Hart equation that relates the measured resistance of a 200 k resistor (5 volt excitation) to temperature.

  5. Conclusions • Repeatability was larger than expected with standard deviations of about +/- 0.1 C • Overall accuracy seemed acceptable from -20 to 40, but larger excursions at range limits of the probe. • Probe to Probe range was about 0.3, with larger differences at the extremes.

More Related