CIRAS-3 Operation Manual V. 1.09 143 support@ppsystems.com
All electrical and pneumatic connections are highlighted below. Remove the link pipe between “REF IN”
and “AIR OUT” which is only used when using the leaf cuvettes with the CIRAS-3.
1. Connect the 4 pin plug on the APA to the “Aux” socket on the CIRAS-3 console. Line the
arrow up on the black APA connector with the top middle of the “Aux” connector.
2. Connect the SRC-1 and CPY-4 to one of the 15 pin sockets on the APA and connect the
STP-1 Soil Temperature Probe to the other 15 pin socket on the APA (if used).
3. Connect the “Gas In” and “Gas Out” tubing on the SRC-1 and CPY-4 tubing to the “REF
IN” and “REF OUT” ports on the CIRAS-3 console.
Note. The CPY-4 is supplied with a water vapor equilibrator which we recommend is used for high
humidity conditions. The water vapor equilibrator should be plumbed as shown below:
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