4
RANGE AND ACCURACY
MPS-2 & MPS-6
Figure 4: Time series MPS water potential data collected at 20 cm
under a dry oak forest in Switzerland. Note the range extends well
beyond permenant wilting point.
3
4.3
Calibration
Wet End
We calibrate each MPS-2 and MPS-6 sensor at an air-dry and vac-
uum saturated state at Decagon Devices. This two-point calibration
results in the accuracy stated above. Although better wet-end accu-
racy can be achieved through user calibration of the MPS-2 sensor, it
is more cost-effective and convenient to simply order MPS-6 sensors
that are fully calibrated in the wet end at Decagon.
3
Figures 3 and 4 reproduced with permission from Walthert, L. (2013): Soil
as a site factor in Swisss forests(project title). Swiss Federal Institute for Forest,
Snow, and Landscape Research WSL
12
