Hach-Lange 1720E Low Range Turbidimeter - Manual (Page 35)

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Troubleshooting
7.3 Event Codes
Event codes are not displayed on controller and must be downloaded from the event log to
be viewed. Troubleshooting actions are provided in
Table 5 on page 30 .
High Readings Deionized water turbidity is greater than
0.5 NTU Clean the instrument.
Access Calibration History for turbidity value of
ultra-filtered water.
Verify the flow is between 200–750 mL/min.
Recalibrate the instrument.
Table 6 Additional Malfunctions Not Recorded in the Event Log (continued)
Symptom Possible Cause Corrective Action
Table 7 Event Log List
Event Event # Data1 Data2 Data3
Bubble Reject Change 0
0 = OFF
1= ON
— —
Filter Size Change 1
0 = No avg, 1 = 6 sec
2 = 30 sec, 3 = 60 sec
4 = 90 sec
— —
Data Log Interval Change 2
0 = 30 sec, 1 = 1min
2 = 5 min, 3 = 10 min
4 = 15 min
— —
Power On 3 1 — —
Calibration 4 Cal Gain Initials —
Verification 5 Expected Value Meas Value Initials
Dark Reading Warning 6 Measured Value — —
Temperature Warning 7 Temperature Value — —
Voltage Warning 8
16 = +5V high
32 = +5V low
64 = V in high
128 = V in low
— —
Lamp Warning 9
1 = lamp V high
2 = lamp V low
4 = lamp I high
8 = lamp I low
— —
A/D Fail 10 1 — —
Lamp Fail 11 2 — —
Flash Fail 12 4 — —
Output Mode Change 13
0 = Active, 1 = Hold
2 = Transfer, 4 = Normal
— —