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9.15 Calibrate the photometer with bi-distilled water
1. Fill the analysis vessel with demineralized water.
2. Set the voltage of the sensor output to 9.5 V.
3. Do a calibration.
The absorbance output value is ~0 mAU.
4. Drain the analysis vessel.
The absorbance output value is approximately 300 mAU.
5. If no difference is seen between the two absorbance output values, the photometer is not
operating correctly.
9.16 Replace the micropump duckbills
Micropumps are used to dose the reagents into the analysis vessel or to dilute the sample. Each
pulse of the micropump doses about 50 µl (± 1%) of liquid. There are two types of micropumps
available: standalone or installed on a manifold.
When the micropump duckbills are replaced, make sure the duckbill valves stay in the correct
position or the micropump will not operate correctly.
1. Open the electrical cabinet.
2. Remove the micropump valve.
3. Remove and discard the micropump duckbills.
4. Select the position for the micropump on the manifold. Put a duckbill valve with the top down in
the upper position on the manifold. In the lower position, place the duckbill with the top pointed
towards the outside.
5. Install the micropump motor. Use the metal pin on the manifold to install the motor in the correct
position.
Note: The metal pin on the manifold only fits on the micropump in one way.
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