Leaf Porometer Operator’s Manual
4. Sensor Head Calibration
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This will ensure that the hole is properly aligned with the
diffusion path in the sensor head. Once the sensor head is
attached to the calibration plate, the Leaf Porometer will
automatically sense the calibration plate and begin the
hydration process.
8) Hydrating the Sensor
The sensors in the leaf porometer must be hydrated before
stable readings can be taken. The calibration routine allows
the sensors to hydrate on the calibration plate for three min-
utes. During this time, the sensor head should not be
removed from the calibration plate. The progress of the
hydration period can be tracked on the indicator bar at the
bottom of the screen and the timer in the top right corner.
9) Orienting the Sensor and Calibration Plate
Once the hydration, a calibration measurement, or a regular
measurement begins, it is important not to block the flow
of moisture from the Teflon filter at the bottom of the alu-
minum block. You can hold the sensor in the air or lay it on
its side or upside down with the Teflon filter up. Do not set
the porometer down with the Teflon filter oriented down or
