Hanna Instruments PCA 310 - Manual (Page 70)

70
Allow sulfuric acid to stand in the measuring cell for 15 min-
utes 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 clean-
ing solution.
CHANGING MEASURMENT CELL
To change the measuring cell (#7 page 10) with a new one
(HI 70487) in the PCA310 - 330 analyzers, follow the steps:
•
Stop the analyser by turning off the main switch.
• Remove the reagent and buffer bottles to free space.
•
Disconnect the reagent and buffer tubes from the cell
body.
•
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.
• Unscrew the cell from its support by using hexagonal
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
as it was at the dismounted cell.
• Power on the PCA310 - 330 analyzer.
• Go to menu mode “Chlorine Menu” - “Cal measuring
Cell” and start the “Calibration Blank” function.
• Confirm by pressing “CFM” when asked “Start the blank
calibration?”.
• Wait for the end of the procedure.
• If the message Press CFM appears, the procedure was
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.
• Wait 3 cycles for the measurement to stabilize.
• Calibrate the measuring cell as described at page 40.
Note: Before start measuring assure that a stirring bar (HI 70487)
is present in the cell.