CIRAS-3 Operation Manual V. 1.09 190 support@ppsystems.com
Absorber Filters
Each absorber end cap contains a white plastic filter disk. Generally these do not need to be replaced but
should be checked periodically. However, they must be present to prevent any of the column contents
being drawn with the gas stream causing damage to the instrument.
“O” Rings
All “O” Rings on the absorber columns should periodically (every couple of weeks) receive a slight smear
of silicone grease to aid ease of fitting, improve the seal and extend the life of the “O” rings and to keep
them from cracking or breaking. Once sealed, end fittings should be checked to ensure that the O-rings
are seated correctly in their groove and that they are not trapped or pinched resulting in system leaks.
CO
2
Regulator
The CO
2
regulator should not require any routine maintenance. The CO
2
cartridge seals on the face of
the 8g CO
2
cartridge and these seals should last for many years. Each system is supplied with gasket
CO
2
seals (Part No. 20577-1) if replacement is necessary. If you suspect a faulty seal, follow the
instructions below. Before attempting to service the CO
2
regulator, check to make sure that there is
not a pressurized CO
2
cartridge present. See How do I determine the state of the CO2 cartridge? on
page 50. Depending on pressure, you may here a small hiss when loosening the cylinder holder from the
regulator body which is normal.
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