Hanna Instruments PCA 310 User 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.