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7.3 Equipment
Service
7.3.1
Analyser Cell Assembly
The analyser cell assembly contains the gold cathode, copper anode, motor and agitator
assembly, 100 x 3/16" PVC spheres, and a motor cable assembly with a quick disconnect fitting
(Refer to Figure 3). The cell assembly is captive and can be removed from the analyser wet-
end for service as follows (Refer to Figure 4):
a.
Turn the power switch to the OFF position.
b.
Stop sample flow.
c.
Remove the sample drain plug and drain the sample (fig.4, 3).
d.
Remove three screws on the analyser body below the analyser cell assembly (fig.4,
16). Disconnect red wire from the cell assembly (fig.4, 19). Remove the two nuts
(fig.4, 15) securing the (black) electrical wire to the analyser body (fig.4,19).
e.
Release the analyser motor cable quick disconnect on the electrical enclosure.
f.
Remove the analyser cell assembly (fig.4, 1) and place on a counter or bench top.
g.
Gold Electrode
1.
Normal life of the gold electrode is three to five years. This can vary depending
upon the chemical residual being measured and the quality of the sample
water. The gold electrode should appear clean and shiny. To inspect the gold
electrode, proceed as follows:
1a.
With the analyser cell assembly on a bench top, remove the three recessed
screws on top of analyser cell (Figure 3).
CAUTION: THE ANALYSER CELL ASSEMBLY CONTAINS 100 x 3/16" PVC
SPHERES. WHEN TAKING APART THE ANALYSER CELL, BE SURE TO
CAPTURE AND SAVE THE SPHERES FOR REASSEMBLY OF THE CELL.
1b.
Invert cell assembly so that the motor is facing down (Figure 3).
1c.
Gently pull apart the top and bottom of analyser cell assembly. Be sure to
capture the PVC spheres inside the assembly.
1d.
Inspect the gold electrode (Figure 3). Clean and polish with a clean cloth
and/or soak in a dilute acid solution (e.g. 10% HCl v/v). If the electrode is
damaged, the gold electrode assembly must be replaced (Severn Trent
Services part number 14184).
1e.
Replace the PVC spheres and reassemble the cell by reversing steps 1a
through 1c. Ensure that none of the PVC spheres are on the top of the center
of the agitator.
h.
Copper Cell
The copper cell should appear clean and shiny. To inspect the copper cell, proceed as
follows:
1a.
With the analyser cell assembly on a bench top, remove three recessed screws
on top of analyser cell (Figure 3).
CAUTION: THE ANALYSER CELL ASSEMBLY CONTAINS 100 x 3/16" PVC
SPHERES. WHEN TAKING APART THE ANALYSER CELL, BE SURE TO
CAPTURE AND SAVE THE SPHERES FOR REASSEMBLY OF THE CELL.
1b.
Invert cell assembly so that the motor is facing down (Figure 3).
1c.
Gently pull apart the top and bottom of analyser cell assembly. Be sure to
capture the PVC spheres inside the assembly.
