Reports
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| Title: | Test of RR-USGS HMPs | ||||||||
| Date: | 2024-11-26 - 2024-12-02 | ||||||||
| Data File: | RR-USGS_HMPtest_20241202.csv | ||||||||
| Refers to: | RR,T2820183,F1830005,P3630008,375061,C2420049 | ||||||||
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This was a quick test of the four HMP45s acquired from USGS with the hand off of the Rush Ranch site. They were compared with the HMP155 last removed from West Pond. All were connected to a CR1000 sampled at 10sec intervals and saved as 1min averages. They were mounted vertically side by side in the lab so the over all range of comparison is not great. This was just to test if they were working. A better inter-comparison can be done in the field.
Figure 1. Time series plot of the air temperatures. These are pretty tight, but two groupings. Also more noise in the HMP155 and F1830005 and C4240049 while P3630008 and 375061 are smoother. Smooth is okay as these are 1min data and we use 30min data in the field.
Figure 2. Scatter plot of the Air temperature as compared to the HMP155. Very tight nearly one-to-one response, but very small range of temperatures 20-26.5C - about a 10th of full range. Figure 3. Time series plot of the RH values. Much more separation between the sensors here than for air temperature but also a larger portion of full range - one third.
Figure 4. Scatter plot of the RH as compared to the HMP155. I guess I would choose my favorites here based on the r-squared - F1830005 (0.9992) and 375061 (0.9985). However, the high end above about 80% is when these sensors usually have problems. |
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