Forma Scientific 3546 - 5.5 Changing the CO2 Filter

Forma Scientific, Inc.________________________________________________Maintenance
5-5
5.5 Changing the CO
2
Filter (Qualified Service Personnel Only)
Note: Under conditions of normal use, and dependent upon the purity of gas being used,
the CO
2
filter should be serviceable for about five years.
If the CO
2
filter becomes clogged, replace it with Forma stock #770001.
 Disconnect the unit from the power supply.
 Remove the screws securing the side service panel.
 Remove and replace the filter.
5.6 CO
2
Test Instruments
The best standard available for zeroing or calibrating the CO
2
controller is air, which
typically contains 0.033% CO
2
by volume. Variations from this figure are insignificant.
It is very important that any Forma automatic CO
2
incubator be zeroed to air (See
Section 3.16). CO
2
test instruments should be used as a secondary check or to verify the
CO
2
at operating levels.
Because sampling technique is so important when using CO
2
test instruments,
information is included in this manual on the use of the most commonly used test
instrument, the FYRITE. The FYRITE should be used for checking purposes only; not for
the actual zeroing of Forma equipment!