Maintenance; Cleaning The Controller; Fuse Replacement; Battery Replacement - Hach Polymetron 9500 User Manual

Maintenance

Multiple hazards. Only qualified personnel must conduct the tasks described in this section of the document.

Cleaning the controller

Always remove power from the controller before performing maintenance activities.
Note: Never use flammable or corrosive solvents to clean any part of the controller. Use of these solvents may
degrade the environmental protection of the unit and may void the warranty.
1. Make sure the controller cover is securely closed.
2. Wipe the controller exterior with a cloth dampened with water, or with a mixture of water and mild
detergent.

Fuse replacement

Fuses are not user-serviceable items. The need for fuse replacement in controllers indicates severe
technical failure and is therefore considered to be a service activity. If a blown fuse is suspected,
contact Technical Support.

Battery replacement

The lithium ion backup battery is not user replaceable. Contact Technical Support for replacement.

Troubleshooting

Problem
No current output
Incorrect current output
No relay activation
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D A N G E R
D A N G E R
Resolution
Verify current output configuration.
Test current output signal using the Test/Maintenance submenu.
Input a current value and verify the output signal at the controller
connections.
Contact Technical Support.
Verify current output configuration.
Test current output signal using the Test/Maintenance submenu.
Input a current value and verify the output signal at the controller
connections. If the output is incorrect, perform an output
calibration.
Make sure relay connections are secure.
If using an external power source, make sure the relay wiring is
correct.
Make sure the relay configuration is correct.
Test the relay activation through the Test/Maintenance menu.
The relay should energize and de-energize as selected.
Make sure the controller is not in calibration mode and that the
relay is not being held.
Reset the Overfeed Timer to make sure the timer has not
expired.