Hach-Lange NITRATAX sc - Manual (Page 28)

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Maintenance
6.4 Check the calibration
The NITRATAX sc program supports comparative measurements as part of Analytical
Quality Assurance (AQA) using a command that automatically sets the factor to "1" and
the offset to "0" so that standard solutions can be measured directly without further
adjustments.
1. Select MENU.
2. From the Main Menu, select SENSOR SETUP and confirm.
3. Select the appropriate sensor, if more than one sensor is attached and confirm.
4. Select TEST/MAINT and confirm.
5. Select MAINT.PROC. and confirm.
6. Confirm the displayed OUTPUT MODE information.
7. Select SIGNALS and confirm.
8. Confirm ENTER = WIPE.
9. Tank version: Remove sensor from the tank, rinse the measuring path with water
and fill it with standard solution (pipette), see Figure 9 on page 27 .
Flow-through version: Interrupt sample feed and supply with standard solution
(syring).
Observe the individual measured values on the display (3 rd numerical value from the
top). The measurements are made automatically at an interval of 1 second. Then
re-install the sensor or connect sample feed.
10. Press BACK to return to MAINT.PROC.
11. Press BACK again. Confirm RETURN PROBE TO PROCESS (Measuring operation
after automatic wiping).
12. The calibration check is completed.
Figure 8 Changing wiper profile
1 Retaining strap 3 Wiper profile
2 Cap bottom 4 Locking the wiper and cap in place