CIRAS-3 Operation Manual V. 1.09  173  support@ppsystems.com 
 
Status Codes Displayed on the CIRAS-3 LCD 
From time to time the CIRAS-3 may send a status code (message) to either A) recommend that the user 
perform a certain task or B) to report a suspected problem.  Some messages that get sent include just the 
Code or the Description (with code) as shown below. 
System OK. Cuvette open if present [00] 
No action required.  Indicates that the PLC3 Leaf 
Cuvette is in the open position. 
Under ”Zero, Diff Bal Mode” you are operating under 
“Manual” mode.  You should perform a Diff Bal as 
recommended (Z-Diff Bal (F7) > Diff Bal).  This is 
critical to ensure calibration stability and accuracy.  
Under ”Zero, Diff Bal Mode” you are operating under 
“Manual” mode.  You should perform a manual Zero 
(Z-Diff Bal (F7) > Zero).  This is critical to ensure 
calibration stability and accuracy.   
Normal Running – PLC Closed [10] 
No action required.  Indicates that the PLC3 Leaf 
Cuvette is in the closed position. 
Record Key Pressed, System OK [20] 
No action required.  Indicates that a measurement 
was recorded. 
No action required.  Indicates that the CIRAS-3 has 
achieved a good MaxC. 
Indicates that the CIRAS-3 has not achieved a good 
MaxC. Make sure you have a fresh CO
2
 cartridge 
and try performing another MaxC.  If problem 
persists contact PP Systems. 
Chamber Par 1 not reading (Left) 
The left PAR sensor inside the PLC3 Universal Leaf 
Cuvette is not reading properly.  Access the internal 
PLC3 PCB in the handle and check electrical 
connections at pads 44, 45 and 46. 
Chamber Par 2 not reading (Right) 
The right PAR sensor inside the PLC3 Universal 
Leaf Cuvette is not reading properly.  Access the 
internal PLC3 PCB in the handle and check 
electrical connections at pads 47, 48 and 49.