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6.3 Replace Fuses
Use the following procedure to replace fuses (all fuses are 1A):
1. Turn off power.
2. From inside upper left corner near pump switch, press down on fuse cap and turn counterclock
wise to remove.
3. Pull fuse and cap straight out.
4. Replace fuse in cap (make sure the new fuse is the same type and rating as the one you are
replacing).
5. Press fuse cap in place and turn clockwise.
6. Turn power on.
6.4 ISE Reaction Cell Assembly, Electrodes
Figure 63. ISE Reaction Cell Assembly, Electrodes
CFA3000 MANUAL SECTION 6
REPAIR PROCEDURES
6.4.1 The sodium electrode used in the CFA3011 sodium analyzer is a proprietary “solid state” electrode
which is joined with a reference electrode in a sealed cartridge. The buffered sample stream flows into the
reaction cell—through the ground stud to the sodium electrode, then into the reference electrode, out through
the ground stud and then to waste. The sample concentration is measured in the sodium electrode, compared to
the reference value and the sodium concentration is determined.