CLEANING MEASUREMENT CELL
In order to maintain the maximum reliability of measurements, it is recommended to periodically clean
the measurement cell. In fact, the measurement cell could collect sediment or develop a film growth
on the inside walls. When the automatic dirt compensation system detect the deposits presence, the
analyzer will show “Dirty cell” message.
The measurement could continue but cleaning is recommended to avoid deposits that are harder to
clean.
Thorough cleaning with a dilute acid solution and a cotton swab is recommended monthly. Depending
on sample conditions at individual locations and absence of input filters, it may be necessary to clean
the cell on a weekly basis. This can be determined by observing the cell condition when reagents
are changed.
It is also highly recommended to clean the cell every time you turn the meter off. In such a way,
scaling and molds growth are prevented. Otherwise, subsequent cleaning might become more difficult.
For cleaning procedure, remove the plastic cap placed on the top of the measuring cell.
Add a few drops of 19.2N Sulfuric Acid solution or alcohol to the cell.
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.
CHANGING MEASURMENT CELL
To change the measuring cell (#8 page 11) with a new one (
HI704871
) in the
PCA310
-
PCA340
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 11)
and cell.
• Disconnect the drain tube (#9 on page 11) 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
-
PCA340
analyzer.
• Go to menu mode “Chlorine Menu” - “Cal measuring Cell” and start the “Calibration Blank”
function.
MAINTENANCE
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