Hach EZ Series Basic User Manual page 30

9.11 Replace the dispenser syringe
Personal injury hazard. Glass components can break. Handle with care to prevent cuts.
Carefully push the syringe upwards when a new piston is installed. The thread on the dispenser valve is easily
damaged.
The analyzer uses the dispenser to accurately dose a volume of liquid during titration or dilution. The
dispenser has a syringe, a valve and a stepper motor. The syringe has a glass cylinder and a
plunger.
Do the steps that follow to replace the dispenser piston:
1. Flush the dispenser piston with deionized water to remove the reagent.
2. Fill the dispenser with air to remove the deionized water.
3. Dose half of the syringe volume to put the syringe plunger in the middle position.
Note: Set the drain pump to on during this step.
4. Do the steps in the illustrated steps that follow.
5. When the procedure is complete, push F2 > Dispenser > [select dispenser] > E > Init to start the
dispenser operation.
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