Replace The Fuses; Do A Validation Check (Analytical Quality Assurance); Validation With Standard Solution - Hach PHOSPHAX sc LR User Manual

Maintenance

5.10 Replace the fuses

5.11 Do a validation check (analytical quality assurance)

5.11.1 Validation with standard solution

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The fuses for the power supply are found in the SC Controller. Refer to the SC Controller
documentation for fuse replacement information.
Do regular validation checks of the system to make sure that the measurement values
are reliable. Usually, a validation check is done after a calibration cycle.
Chemical exposure hazard. Obey laboratory safety procedures and wear all of the
personal protective equipment appropriate to the chemicals that are handled. Refer to the
current safety data sheets (MSDS/SDS) for safety protocols.
Chemical exposure hazard. Dispose of chemicals and wastes in accordance with local,
regional and national regulations.
Always put the instrument in service mode before tubing is removed. Otherwise air can get into
the system and damage to the instrument could occur.
Items to collect:
• Personal protective equipment (refer to MSDS/SDS)
• Blind plug, LZY193 (plugging set is LZY007)
• Beaker, 150 mL
• Standard solution for validation
• Fittings 3.2 mm, LZY111
1. Put the instrument in service mode. For use with Filtrax, refer to the documentation
supplied.
2. Push Menu.
3. Select SENSOR SETUP > PHOSPHAX sc LR > DIAG/TEST > MAINTENANCE >
SELECT PROCESS then push SERVICE MODE.
4. On the overflow vessel, unscrew the fitting of the sample tube that connects the
overflow vessel and the valve block.
5. Screw the blind plug in the thread of the overflow vessel and put the sample tube in a
150-mL beaker with standard solution for the validation. Refer to
Note: To have stable measurement values, put the beaker in the collecting tray and close the
door of the analyzer.
6. Push Menu, then select SENSOR SETUP > PSHOSPHAX sc LR.
7. Select DIAG/TEST > MAINTENANCE > SELECT PROCESS > VALIDATION
The validation starts and the remaining time is displayed. After the validation is
completed the single measurement values and the average value is shown on the
display. To leave the validation screen press enter and the analyzer will enter service
mode.
C A U T I O N
C A U T I O N
N O T I C E
Figure 20.