52Maintenance6.6 Validation (Analytical quality assurance)Regular validation checks of the complete instrument must becompleted to make sure the analysis results are reliable.Required parts:• Blind plug LZY193 (Plugging set LZY007)• Beaker (for example 150 mL)• Standard solution for validationFollow the internal menu steps for the validation.1. From the MENU select SENSOR SETUP>AMTAX SC andpress ENTER.2. Select MAINTENANCE>TEST/MAINT>VALIDATION>DISCHARGE.3. Enter the number of measurements which should bedischarged before starting the measurements of the validation.(Default value: 3; value range: 2 to 5)4. Select NUMBER OF MEAS..5. Enter the number of measurements which should be used forthe validation measurements.(Default value: 3; value range: 2 to 10)6. Select START after adjusting both parameters and the analyzeris going into the service state. The remaining time is displayedin seconds.The OUTMODE is set to HOLD.7. Select ENTER to modify the analyzer (Figure 21, page 53):a. Unscrew the fitting (item 2) of the sample tube (item 5)which connects the overflow vessel (item 1) and the valveblock (item 4) at the overflow vessel.b. Screw in the blind plug (item 3) in the thread of the overflowvessel (item 1) and insert the sample tube in a beaker (forexample 150 mL) with standard solution for the validation.Note: To receive stable measurement values, close the door of theanalyzer.8. Press ENTER to start the validation.Note: The remaining time is displayed in seconds:9. Press ENTER to escape.The results are displayed to note down.• The discharge value and the Conc value are counted downto zero.(Discharge value + measurement value) 5 minutes = remaining time/sec×
