CIRAS-3 Operation Manual V. 1.09 171 support@ppsystems.com
Flow Control
I am unable to achieve the set cuvette flow rate
• The absorber column assemblies may not be seated properly. This is a common problem just
after replacement of desiccants. Check to make sure that both columns (Zero and CO
2
/H
2
O
control) are properly seated and secured.
• Possible ASU pump failure. Replace.
• The internal tubing between the back of the CO
2
regulator and diversion solenoid on the main
flow board has disconnected. This can happen when someone attempts to change out a
pressurized CO2 cartridge. When this happens you will hear a loud “pop” and the pressure will
cause the internal tubing to become disconnected. Look for this and reconnect the tubing
between the solenoid and regulator.
My pumps seem to be running harder and louder than normal
• Most likely cause is a restriction in the gas circuit. Open the battery compartment door and
inspect the internal tubing for any kinked piping. Also inspect for any pieces of tubing that may
have slipped off one of the pumps or is cracked around the pump fittings.
• One of the absorber columns is not firmly seated in the manifold. Check both columns and
ensure that they are properly seated.
• Blocked filters. Start with the air supply unit hydrophobic filter as this is the one that might be
blocked and if this doesn’t correct the problem start checking the other filters. See Air Filters
on
page 183.
My reference pump is not running
• Check the electrical connection to the PCB. If it is connected properly try tapping on it with a
small screwdriver or pen and see if that gets it going. Sometimes the internal vanes get stuck
and a simple tap is all it takes to get it back up and running especially if the system was not in use
for some time. If that does not get it up and running and you are properly connected it likely
means you have a seized pump and it requires replacement.
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