Hach FT660 sc Manuel D'utilisation De Base page 23

Troubleshooting
Problem
Low (< 1) or negative readings Head assembly is not correctly
Errors
When an error occurs:
• The reading on the measurement screen flashes.
• All outputs are held.
• The red status light on the instrument turns on.
To access the current instrument errors, select Diagnostics, [Select Sensor], Error List.
Select an error and confirm to identify the cause of the error. Refer to
Error
A/D FAILURE
LASER FAILURE
FLASH FAILURE
LOW SIGNAL ERROR Signal is too low (less than 3.0 mNTU)
Warnings
When a warning occurs:
• A warning icon flashes and a message is shown on the bottom of the measurement screen.
• The red status light on the instrument starts flashing.
Warnings do not affect the operation of menus, relays and outputs.
To access the current instrument warnings, select Diagnostics, [Select Sensor], Warning List.
Select a warning and confirm to identify the cause of the warning. Refer to
Possible cause
installed on the body of the
instrument
Laser failure
PMT/Electronics failure
Table 2 Error list
Possible cause
A/D conversion failure
Laser did not work correctly and is turned
off
Data log and event log not working
Resolution
Correctly install the head assembly on
the body of the instrument. If not, the red
status light will flash.
Contact Technical Support.
Table 2.
Resolution
Contact Technical Support.
Make sure that the head assembly is
installed correctly. If not, the red status light
will flash.
Contact Technical Support.
Table 3.
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