CIRAS-3 Operation Manual V. 1.09 196 support@ppsystems.com
PLC3 Pneumatic Connector
Each PLC3 pneumatic connector has two “O” rings that provide
a good seal when connected to the PLC “Gas” connector on
the CIRAS-3 console.
We recommend that you periodically (every few weeks) apply a
slight smear of silicone grease to keep the “O” rings mildly
lubricated to keep them from getting to dry causing them to
crack or even break apart.
Environmental Sensors
Temperature
All PLC3 leaf cuvettes are equipped with sensors for measuring air and leaf temperature. These sensors
should not require recalibration. If you suspect a problem with any temperature measurements you are
encouraged to get in direct contact with PP Systems. The only replaceable sensor that may break or go
missing is the Leaf Temperature Thermistor commonly used with the PLC3 Narrow and Conifer leaf
cuvettes.
Leaf Temperature Thermistor including Plug
PAR
All PLC3 leaf cuvettes include sensors for measurement of PAR internal (PARi) and PAR external
(PARe). PAR sensors do require frequent checks and recalibration is often necessary usually after 2
years. A simple check is to periodically compare readings with an accurate PAR sensor that is known to
be calibrated and accurate. If the readings are not close, simple recalibration can be performed at your
site on these sensors. See PAR Calibrate on page 106
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