CIRAS-3 Operation Manual V. 1.09  112  support@ppsystems.com 
 
APA (F6) 
Press APA (F6) to view readings associated with the Auxiliary Probe Adapter (APA). This piece of 
hardware is required to use the SRC-1 and CPY-4 with the CIRAS-3. 
 
Displays the probe type for different sensors that can be used with the 
CIRAS-3 (i.e. SRC-1 Soil Respiration Chamber or CPY-4 Canopy 
Assimilation Chamber). 
Displays the measured PAR value (µmol m
-2
 s
-1
) from the sensor on the 
accessory (if applicable). 
Displays the temperature (
o
 C) from the sensor on the accessory (if 
applicable). 
Displays the temperature (
o
 C) from the sensor on the accessory (if 
applicable). 
 
Our latest SRC-2 Soil Respiration Chamber and CPY-5 Canopy Assimilation Chamber (introduced in 
February 2016) can connect directly to the 4 pin “AUX” connector on the CIRAS-3 console (No APA 
required).