Troubleshooting
53
Table 1 1 presents sensor warnings displayed in the Event Log, possible causes,
and corrective actions.
The following table presents additional malfunctions which may not be recorded in
the Event Log.
Table 11 Troubleshooting
Sensor Warning Possible Cause Corrective Action
Bad Lamp
Lamp burned out Replace the lamp. See section 6.4.4 on page 49.
Lamp unplugged Restore connection
+12 V connection loose at controller Restore connection
Dislodged lamp Reinstall lamp
Bad circuit board in turbidimeter head Contact the Customer Service Department.
Low Signal
Photocell coated/dirty
See Cleaning the Photocell Window on page 48.
Contact the Customer Service Department.
Photocell wires disconnected Reconnect wires
Photocell broken/cracked
Replace photocell
Contact the Customer Service Department.
Lens coated/dirty Clean the lens using isopropyl alcohol and a cotton swab.
Obstructed light path Remove obstruction
Sample turbidity >100 NTU Switch to a high range turbidimeter
See Bad Lamp causes above See Bad Lamp corrective actions above
Bad System Voltage
Improper wiring at controller
See the controller wiring instructions in section 3.2,
Electrical Installation on page 14.
Turbidimeter head cable shortened to
improper length
Contact the Customer Service Department.
Fluctuation in voltage Turn instrument power off and back on.
Bad circuit board in turbidimeter head Contact the Service Department
A/D Converter Timeout
Fluctuation in voltage Turn instrument power off and back on.
Bad circuit board in turbidimeter head Contact the Customer Service Department.
High Dark Counts
Light Leak—Turbidimeter head not on
turbidimeter body or calibration cylinder
during Power Up or Zero Electronics
Make sure the turbidimeter head is on the turbidimeter body
and properly aligned and repower instrument or perform
ZERO ELECTRONICS in the CALIBRATION MENU.
Light Leak—Turbidimeter head not
properly aligned on the turbidimeter
body or calibration cylinder during
Power Up or
Zero Electronics
Make sure the turbidimeter head is properly aligned and
repower instrument or perform ZERO ELECTRONICS in
the CALIBRATION MENU.
Photocell broken/cracked Contact the Customer Service Department.
Table 12 Additional Malfunctions Not Recorded in the Event Log
Symptom Possible Cause Corrective Action
Continuous Underrange
(negative reading)
Calibration standards not in the
correct order or incorrect dilution
Verify the accuracy of calibration standards and recalibrate the
instrument. See Low Signal in Table 11.
Continuous Overrange
(100 NTU)
Calibration standards not in the
correct order or incorrect dilution
Verify the accuracy of calibration standards and recalibrate the
instrument.
To Next Page
Loading...
