Metrohm 853 IC CO2 Suppressor - Manual (Page 20)

4 Troubleshooting - Problems
853 CO
2
Suppressor / Instructions for Use 8.853.8001EN
14
4.4.2 Maintenance by Metrohm Service
It is advisable to carry out the maintenance of the 853 CO
2
Suppressor
within the framework of an annual service visit by trained Metrohm
technicians. If aggressive and corrosive chemicals are used then it may
be necessary to reduce the service intervals.
The Metrohm Service Department will be pleased to provide you with
competent advice about the care and maintenance of all Metrohm in-
struments at any time.
4.4.3 CO
2
Absorber Cartridge replacement
The 6.2837.000 CO
2
Absorber Cartridge requires replacement at regu-
lar intervals because of blockages or exhaustion.
Blockages
Moisture will block the CO
2
Absorber Cartridge. This is indicated by the
cartridge material changing color (the blue layer turns violet). The air
flow is reduced and the vacuum becomes too low – instead of the
"Ready" LED (3) the "Status" LED (2) lights up. In order to protect the
CO
2
Absorber Cartridge an H
2
O Absorber Cartridge is included up-
stream from it. Regular regeneration (see Section 4.4.4) of the H
2
O Ab-
sorber Cartridge increases the working life of the CO
2
Absorber Car-
tridge.
Exhaustion
The absorption capacity of the CO
2
Absorber Cartridge is limited. De-
pending on the working life and the laboratory surroundings the ab-
sorption capacity decreases with time. This is indicated by a rising
baseline (as more CO
2
reaches the detector).
4.4.4 H
2
O Absorber Cartridge regeneration
The purpose of the H
2
O Absorber Cartridge is to protect the CO
2
Ab-
sorber Cartridge from moisture. The lifespan of the H
2
O Absorber Car-
tridge depends on the humidity of the ambient air. Humidity exhausts
the H
2
O Absorber Cartridge. Exhaustion is indicated by a color change:
before the color of the whole of the filling material has changed (from
orange to colorless) the H
2
O Absorber Cartridge must be regenerated
(see 8.108.1046 Leaflet). Regeneration consists of replacing the filling
material:
1. Heat the loose material (i.e. not in the cartridge) at 140 °C over-
night and then refill it, or dispose of the old material and refill the
cartridge with new material (Fluka # 94098).
2. Cover the packed material with absorbent cotton.