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CHANGING MEASURMENT CELL
Note:
7 0
Allow sulfuric acid to stand in the measuring cell for 15 minutes
to dissolve any foreign materials adhering to the cell walls. Wipe
the cell interior with a cotton-tipped swab. After wiping, open
the drain port to empty the measuring cell from the cleaning
solution.
To change the measuring cell (#7 page 10) with a new one
(HI 70487) in the PCA 311 - 331 analyzers, follow the steps:
Stop the analyser by turning off the main switch.
•
Remove the reagent and buffer bottles to free space.
•
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Disconnect the reagent and buffer tubes from the cell
body.
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Disconnect the sample inlet tube from the cell body. This
tube is between electrovalve (#21 pag 10) and cell.
•
Disconnect the drain tube (#8 on page 10) from the cell.
Unplug the cell connector.
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Unscrew the cell from its support by using hexagonal
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wrench.
Put the new cell in its place and screw it in position. Take
•
care to position the electrical cable first.
Reconnect the electrical wires and the pneumatic circuit
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as it was at the dismounted cell.
Power on the PCA 311 - 331 analyzer.
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Go to menu mode "Bromine Menu" - "Cal measuring
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Cell" and start the "Calibration Blank" function.
Confirm by pressing "CFM" when asked "Start the blank
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calibration?".
Wait for the end of the procedure.
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If the message Press CFM appears, the procedure was
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successful and Pressing "CFM" will save the coeficients
for the new cell.
If the message "failed" appears, the cell is not working
•
properly. Check the electrical cable connection and if the
error persist call Hanna Service.
Prime the reagent pump - see page 36 for details.
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Wait 3 cycles for the measurement to stabilize.
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Calibrate the measuring cell as described at page 40.
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Before start measuring assure that a stirring bar (HI 70487)
is present in the cell.
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