Hach AMTAX sc, User Manual

Page: 52 / 118

52
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/MAINT>VALIDATION>
DISCHARGE.
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 NUMBER OF MEAS..
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 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 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.
(Discharge value + measurement value) 5 minutes = remaining time/sec
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