Stamolys CA71CODcr
Maintenance
Hauser
35
reagents must be replaced. Shelf life can be prolonged by keeping the reagents in a dark, cool storage
place. The reagents absolutely must be replaced when:
• The reagents have been contaminated by sample (see "Trouble-shooting instructions")
• The reagents are too old
• The reagents have been spoilt by incorrect storage conditions or environmental influences.
7.2.1
Checking reagents
1.
Visual inspection: reagent R2 with an orange hue is OK. Reagent R2 with a green hue must be
replaced.
2.
Mix approx. 5 ml reagent R2 with a few crystals of dichromate detoxicant R3. If the reagent is
OK, the color quickly changes from orange-brown to green.
3.
Check the concentration of the standard in the laboratory. Adapt the values (PARAMETER
ENTRY, calibration solution") or replace the standard solution.
4.
Reagent R1 must be clear and colorless.
7.2.2
Replacing reagents
1.
Carefully remove the hoses from the canisters and wipe them with a clean and dry (paper)
towel. Wear protective gloves when doing this.
2.
In the Service menu, first switch valve V1 to "S" and valve 4 to "s". This ensures that the liquids
required in the subsequent steps can flow out of the reactor.
3.
Switch on the reagent pump for about 5 seconds for the hoses to be drained.
4.
Switch valve V3 to "H" and the sample and acid pump P1 to "g" for 5 seconds.
5.
Place a beaker with distilled water into the device and place the hoses for reagent R2
(dichromate solution) and for sulfuric acid into the beaker. Then flush the reagent pipes for
about three minutes. To do so, switch both pumps to "g". Then switch them back to "s" (off).
Afterwards, remove the two hoses from the water and pump air for about one minute.
6.
Replace the reagent canisters and feed the hoses into the new canisters.
7.
Fill the reagent hose with the new reagents (SERVICE). Switch all pumps to "g" for this
purpose. Do not switch the pumps off ("s") until no more air bubbles are to be seen in the hoses.
8.
Exit the Service menu. This reseals the drain valve of the reactor.
Carry out a calibration (see chapter "Calibration").
