Hach AMTAX sc, Manual

Page: 20 / 232

20 English
Maintenance
6.6 Validation (Analytical quality assurance)
Regular validation checks of the complete instrument must be completed to make sure the
analysis results are reliable.
Required parts:
• Blind plug LZY193 (Plugging set LZY007)
• Beaker (for example 150 mL)
• Standard solution for validation
Follow the internal menu steps for the validation.
1. From the MENU select SENSOR SETUP>AMTAX SC and press ENTER.
2. Select MAINTENANCE>TEST/MAINTENANCE>VALIDATION> DISCHARDED
MEASUREMENTS.
3. Enter the number of measurements which should be discharged before starting the
measurements of the validation. (Default value: 3; value range: 2 to 5)
4. Select MEASUREMENTS.
5. Enter the number of measurements which should be used for the validation
measurements.
(Default value: 3; value range: 2 to 10)
6. Select START after adjusting both parameters and the analyzer is going into the
service state. The remaining time is displayed in seconds.
The MAINTENANCE OUTPUT MODE is set to HOLD.
7. Select ENTER to modify the analyzer ( Figure 2 on page 21 ):
a. Unscrew the fitting (item 2 ) of the sample tube (item 5 ) which connects the
overflow vessel (item 1 ) and the valve block (item 4 ) at the overflow vessel.
b. Screw in the blind plug (item 3 ) in the thread of the overflow vessel (item 1 ) and
insert the sample tube in a beaker (for example 150 mL) with standard solution for
the validation.
Note: To receive stable measurement values, close the door of the analyzer.
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 down to zero.
• The validation is finished when the process shows the service mode and the
remaining time is 0 seconds.
(Discharge value + measurement value) 5 minutes = remaining time/sec
×