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Clean CO
2
analyzer optics by removing the 4x M4x60 Allen bolts on the detector section. If
necessary, clean both lenses, which are located on the detector and the source section of the CO
2
Analyzer using the Lens Tissue (see item T in the service kits). Replace o-ring with the 72-0325-30
o-ring provided (see item P in the service kit).
Oxygen Purity Test: Using the Simulate menu (see Section 8.1.2 Simulate) set the MFC (see
figure 1 and table 2 in Section 4.1.1 Analysis Enclosure) flow to 10 l/hr and flow oxygen gas
through the CO
2
analyzer for 5 minutes. At the end of this period, the CO
2
analyzer zero reading
(ppm CO2) should be within ±0.5% of full scale of the CO
2
analyzer range. For instance, if the CO
2
analyzer range is 10000ppm, then the CO
2
analyzer zero reading should be typically within
±50ppm. CO
2
analyzer range is displayed on the label of the CO
2
analyzer. It is also recorded in the
CO2 Analyzer menu (see Section 8.3.10 CO2 Analyzer for details).
(If the CO
2
analyzer zero reading is outside the specifications, confirm that there is no CO
2
in the oxygen gas
by connecting the CO
2
filter “used with the base container” between the Cooler and CO
2
analyzer inlet port and
set the MFC to 10 l/h. As the size of the CO
2
filter is small, keep the 10 l/h gas flow running for at least for 5
minutes and record the CO
2
zero readings at the end of the 5 minute period. If the CO
2
zero readings do not
drop significantly with the CO
2
filter in place, this will indicate that there is no CO
2
contamination in the oxygen
supply.)
Warning! A Torque Screwdriver with 3mm Allen bit, calibrated to 1.5 Nm (150 Ncm), is required for the
correct service of the Mixer Reactor. It is strongly recommended not to proceed with the Mixer Reactor
service procedures without a torque screwdriver. An adjustable torque screwdriver can be obtained from a
local supplier. Example specifications and suppliers of the torque screwdriver are as follows:
Lindstrom adjustable torque driver, 40-200Ncm
Stanley Supply & Services, Inc.
http://www.stanleysupplyservices.com/product-detail.aspx?pn=419-704
RS Components Ltd.
http://uk.rs-online.com/web/p/torque-drivers/3851794/
Remove the 4 screws located on the front of the Mixer Reactor and remove the reactor motor,
which contains the diaphragm, located at the back. Hold the reactor motor and turn the diaphragm
anti-clockwise to unscrew. It is recommended to count the number of turns by putting a small mark
on the diaphragm during this process. Place the M4 washer (spacer), which has a height of
~0.7mm, at the center on the diaphragm support. Screw in the new diaphragm (see item M9 in the
service kit) and tighten it firmly. The typical minimum number of turns to tighten the diaphragm is
from 7 to 8.5 turns. If a minimum number of 7 turns, or the number of turns counted above when the
old diaphragm was removed, is not achieved, the diaphragm must be removed and reinstalled.
Push the center and the edge of the diaphragm down firmly into place. When the installation of the
diaphragm is complete, confirm that the diaphragm forms a “concave” shape at the center and the
diaphragm is aligned with the diaphragm housing. In other words, when the diaphragm is installed
correctly, the diaphragm should curve in forming a dent at the center. If such dent has not formed
and if the diaphragm has not aligned with the housing, unscrew the diaphragm, confirm that the
diaphragm is installed correctly and if necessary tighten the diaphragm more with additional turns.
Confirm that the sealing face at the back of the reactor, where the diaphragm sits, is clean. Install
the reactor motor back onto the Mixer Reactor and tighten the screws. There are two side plates
positioned perpendicular to the reactor back plate at the back, which helps align the diaphragm with
the reactor. Using these two side plates as a guide, hold the reactor motor in place, which will align
the diaphragm with the reactor, and tighten the screws using the 3mm washers under each screw.
The torque of the screws should not exceed 1.5 Nm (150 Ncm). It is important that the diaphragm
has not shifted and it has not lost its alignment with the diaphragm housing during the installation
process.
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