Equipment and Calibration History
History for Delta-T ML2x 139/052
| Rec No. | Date | Loc From | Title | Loc To | Notes |
|---|---|---|---|---|---|
| 5530 | 2021-03-17 | Lab none | Calibration | Lab none | After looking at the data recorded from 2021-03-17 to 2021-10-06 it seemed that this probe was reading too low in the spring and too high in the fall. Most years the soil gets completely saturated in the spring and completely dry in the fall. If you take the max and min values from all years they are very similar. Min: 473mV STDEV=6.8mV, Max: 913mV STDEV 24.8. Then we can use these to scale this sensor's min and max with this year's data and we get Corrected (mV) = raw (mV) * 1.272 -187.73 And using the manual's default conversion values for mineral soil (0.05 and -5), the total conversion is: %m = mV * 0.636 + 4.39 |
| 5220 | 2021-03-17 | Lab none | Installed | Tonzi Soil Moisture Probe F -0.50m | Installed in the same location and depth as the one the died and was previously removed. This probe is buried vertically with its times at 44-50cm. It is at the drip line of the tree to the SE of the data logger box. |
| 5196 | 2021-03-15 | Lab none | Tested | Lab none | Tested in the lab. In air it read about 19mv in tap water 1136mV. Seems okay. |
| 1844 | 2015-05-12 | Sherman Island | Removed | Lab none | Removed with the decommissioning of the Sherman Cow Pasture site. |
| 1828 | 2014-06-05 | Sherman Island | Removed | Lab none | Removed from Sherman due to negative readings. |
| 1825 | 2014-04-17 | Lab none | Installed | Sherman Island | I reinstalled this probe at -30cm after completely replacing the cable in the lab. |
| 1824 | 2014-04-10 | Sherman Island | Removed | Lab none | Removed from Sherman due to bad readings. This probe was only in a very short time to replace and older probe whose tines had rotted off, but this one doesn't seem to work either. |
| 1823 | 2014-03-13 | Lab none | Installed | Sherman Island | Installed to replace probe with rotted tines previously removed. |
| 5398 | 2012-08-02 | Lab none | Installed | Sherman Island Soil Moisture Probe SoilCO2 C | Installed at Sherman Island next to the East soil CO2 profile. This sensor was connected to the third position on the data logger. |
| 706 | 2012-07-26 | Twitchell Rice Soil Moisture Probe B | Removed | Lab none | Removed from the Twitchell tower to be replaced by CS615 probes. |
| 1327 | 2011-09-15 | Lab none | Installed | Twitchell Rice Soil Moisture Probe B | Probe re-installed at the rice. (Serial number not recorded in field notes, but by process of elimination, I can only assume it's this probe). |
| 395 | 2011-07-07 | Twitchell Rice Soil Moisture Probe B | Removed | Lab none | Removed from the field after it was discovered that otters had chewed its cable. |
| 707 | 2009-04-03 | Lab none | Installed | Twitchell Rice Soil Moisture Probe B | Installed with the Twitchell Rice tower. |