10
SYSTEM
Settling Time
10 ms
Output
300−1,250 mV (depends on excitation voltage)
Data Logger Compatibility
Data acquisition systems capable of switched 2.5–5.0 VDC excitation and single-ended
voltage measurement at greater than or equal to 12-bit resolution.
COMpLIANCE
Manufactured under ISO 9001:2015
EM ISO/IEC 17050:2010 (CE Mark)
3.2 COMpONENTS
The PHYTOS 31 measures leaf surface wetness by measuring the dielectric constant of
the sensor's upper surface. It has a very low power requirement, which allows for many
measurements over a long period of time (such as a growing season) with minimal battery
usage. This sensor also has very high resolution, which allows for detection of very small
amounts of water (or ice) on the sensor surface. Water on the sensor surface does not need
to bridge electrical traces to be detected, as is common with resistance-based surface
wetness sensors. This means that the PHYTOS 31 does not need to be painted before use,
which eliminates the need for individual sensor calibration.
Circuitry
Sensing area with electrode traces
Mounting holes
Figure 6 pHYTOS 31 sensor
