Troubleshooting - Hach SP-510 Basic User Manual

Items to collect:
• Sulfuric acid standard solution, 19.2 N, 100 mL MDB
• Wooden or paper cotton-tipped swab
• Bent steel paper clip
• Stir bar (optional)
1. Remove the plug from the top port of the colorimeter. Refer to
2. Remove the magnetic stir bar with a bent steel paper clip as a retrieval tool.
3. Use the pipette to add 2–3 drops of 19.2 N sulfuric acid standard solution in the colorimeter.
Note: Lower normality sulfuric acid is not sufficient to clean the colorimeter.
4. Let the sulfuric acid stay in the colorimeter for 15 minutes.
5. Use a wooden or cotton-tipped swab to clean the interior surfaces of the colorimeter cell. Move
the cotton-tipped swap gently up and down.
Note: Do not use a plastic swab to clean the colorimeter with sulfuric acid. The acid will dissolve the plastic.
6. Make sure that the measurement cell is dry.
7. Clean the stir bar with water or alcohol or replace the stir bar.
8. Replace the plug in the top port of the colorimeter.
Replace the sample conditioning filter
Examine the sample conditioning filter regularly when lots of solids are in the sample. Replace the
sample conditioning filter if necessary. Refer to
maintenance interval. Refer to the documentation supplied with the installation kit.
Replace the fuse
Electrocution hazard. Remove power from the instrument before doing maintenance or service
activities.
Fire hazard. Use the same type and current rating to replace fuses.
Remove the two fuses (F1 and F2) and replace them with two new fuses with the same
specifications, T, 1.25 A, 250 V. The same fuse rating is used for the 115 V and for the 230 V
operation. Refer to Figure 10

Troubleshooting

Problem
The SOFT LED light is not on and
the pump motor does not operate.
The SOFT LED light is not on and
the pump motor does operate.
20 English
Maintenance schedule
D A N G E R
D A N G E R
on page 14.
Possible cause
No power
Problem with the power
supply
Figure 13 on page 16.
on page 18 for the
Solution
• Make sure that the power switch is set
to on.
• Connect the power cord.
• Replace the fuses if necessary.
Replace the main circuit board. Contact
technical support.