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Maintenance
9.5 Yearly maintenance
Once a year, maintenance should be carried out on the analyzer to ensure the high degree of
accuracy of the analyzer is maintained. This maintenance requires the following maintenance kit
which is available from your local Hach Lange representative:
The following step-by-step process should be followed:
Part No. Description
09210=A=8000 2 years spare part kit 921X (all ranges). Includes items and quantities below
8 x 589=010=015 Fitting for 1.5mm I.D tubing - 10/32 UNF thread
8 x 590=050=060 Polyethylene tubing 1.6 x 3.2mm (per meter)
8 x 625=065=025 Printed stickers for tubing identification
1 x 09210=A=8050 Kit of (8) ferrules, (8) nuts
8 x 09210=A=4362 Injectors
2 x 226=003=013 Teflon coated magnetic stirrer (for 921X analyzers)
0.5 x 151400,22387 PE tubing 6 x 8mm (per meter)
1.0 x 151575,00006 PE tubing 4 x 6mm (per meter)
1. Ensure that adequate warning has been given to all personnel that are involved in any
way with the analyzer, that maintenance will be carried out on a pre-defined date/time.
2. Shut down the analyzer as follows:
a. Stop the analyzer measuring process by pressing the Stop function key
b. Press the Menu function key and select the MAINTENANCE option
c. Select the EXTENDED STOP option
d. Fill a beaker with 250 mL of demineralized water
e. Open the analyzer to gain access to the reagent and calibration solution canisters
f. Unscrew the caps on the 4 reagent canisters, remove the tube guides from the
canisters and place them in the beaker of demineralized water
g. Unscrew the cap on the calibration solution canister, remove the tube guide from
the canister and place it in a second (empty) beaker. Do not put it in the beaker of
demineralized water containing the reagent tube guides
h. Press OK to start the rinsing process
i. On completion press Esc to exit the process. The measuring cell and reagent
tubes will now be rinsed and empty
j. Disconnect the analyzer from the power source
3. With the analyzer still open, remove the 4 screws holding the pump box cover in place
(item no. 8 in Figure 3 on page 16) and set to one side.
Note: The pump connections are described on the pump box cover. Each pump has an inlet tubing
(from the canister to the pump) and an outlet tubing (from the pump to the measuring cell). The
outlet tubing is also referred to as the injector.
4. Prepare 4 of the injectors (part no. 09210=A=4362 from the maintenance kit). The
process is slightly different depending on the analyzer model in use (sulfuric acid or nitric
acid chemistry).
9120 analyzer with sulfuric acid chemistry:
a. The injector is supplied with the ferrule and fitting nut attached. These are not
required, so cut the tubing immediately after the ferule (90° angle) and discard the
ferrule and nut. Do this on all 4 injectors
9120 analyzer with nitric acid chemistry:
a. No action is required and the tubing injectors should be used as supplied in the
maintenance kit
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