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SECTION 5,
Message1
Probable Cause
Dilution water is ≥ 0.5 FNU.
E1
Two standards have the same
value or their difference is less
than 60 FNU.
E2
Not all standards were read
during the calibration.
Standard 1 is too low (<10 FNU).
Low light error.
E3
EEPROM malfunction.
E4
A/D overrange.
E5
A/D underrange.
E6
E7
Light Leak.
Bad lamp circuit.
E8
1 Error messages 4, 5, and 6 may indicate a failure in the internal electronics.
2 Check lamp by inserting a pencil or piece of paper into the cell compartment and
pressing
. Light should be visible on the inserted object.
READ
continued
Corrective Action
Start calibration over with better
quality dilution water or use a
membrane filter to filter the water
before use.
Recheck preparation of standards
and repeat calibration.
Re-read measurement.
Check lamp2
Check for obstructed light path.
Dilution may be necessary.
Check sum failed. Press I/O.
If E4 reappears, call Hach
service. If CAL? appears,
recalibrate.
Check for obstructed light path.
Call Hach Service.
Check for open lid during reading
and re-read. Check for obstructed
light path. If persists, call Hach
Service.
Close lid before pressing
Reinsert lamp leads at terminal
block-make sure the lead ends are
not touching each other.If this
fails, call Hach Service.
58
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READ
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