Decagon Devices MAS-1 Manuel de l'utilisateur - Page 16
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MAS-1 Soil Moisture Sensor
5. Calibration
approximated by the following linear model. This will
result in slightly worse accuracy at low VWC, with errors
becoming large above 35% VWC.
VWC= 0.0479 * mA - 0.391
Potting Soil/Peat
The following equation can be used to convert MAS-1 trans-
mitted current into VWC in potting soil and peat potting
mixes. Please note that different potting soil types are quite
variable, so this calibration equation may not result in good
accuracy in your particular mix (although precision should
still be good). We recommend a custom calibration for best
accuracy when using the MAS-1 in potting soils.
(0.29*mA)
VWC = 0.00531 *e
Rock Wool
The MAS-1 was calibrated in Groden Expert™ rockwool at
several electrical conductivities. VWC can be calculated as:
2
VWC = 0.00446 * mA
- 0.0359 * mA + 0.0741
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