YSI pHotoFlex Series - Manual (Page 27)

27 ba76126e01 03/2013
Note: Before using the test with your photometer for the first time, determine the reagent blank
value.
YSI model no.: COD3 TC (HR)
Category: KT (reaction cell test)
Cell: 16 mm
Measuring range: 200 - 15000 mg/l COD
Shake the reaction cell
so that sediment is
suspended. Carefully pipette 0.2 ml
of sample into the cell,
close with screw cap and
mix vigorously.
Caution, cell becomes
very hot! Heat the cell in the
thermoreactor for two
hours at 148 °C. Remove the cell from the
thermoreactor and let it
cool down in a cell rack. After approx. 10 min
cooling time sway the
cell.
Place the cell in the cell
rack again and let it cool
down to room
temperature. Carefully insert the cell
in the photometer cell
shaft and start
measurement.
Notes:
• We recommend to determine a new reagent blank value (deionized water instead of sample) for each test package started.
• The chloride content of the sample must not exceed 10,000 mg/l.
• Homogenize samples containing suspended matter with a disperser.
• Before being inserted in the thermoreactor and for photometric measurements the outside of the cell must be free of any
contamination (e.g. fingerprints or drops of water). Wipe the cell with a dry cloth as necessary.
• Let the cell cool down long enough (at least 45 min) before inserting it in the photometer cell shaft. The cells remain stable
for a long time after reaction and can also be left overnight and then measured.
• After cooling do not rock the cell until the measurement takes place in order not to suspend the solids that formed during
the reaction. Suspended matter disturbs the photometric measurement.
COD HR
Program no.
311
*RN311*