Hach LDO Addendum-Operation

Refer to Table 5.
Table 5 Maintenance menu
Option Description
Sensor information Software version—Shows the installed software version
Boot pogram— Shows the installed boot version
Driver version—Shows the installed software driver version
Sensor cap lot code Shows the sensor cap manufacturing lot
Serial number Sensor serial number
Gain correction Adjust the calibration gain value.
Range: 0.50 to 2.00
Offset correction Adjust the calibration offset value (mg/L or ppm).
Range: –3.00 to +3.00
Phase diagnostics Shows the phase for total, red and blue wavelengths. Updates once per second.
Amplitude diagnostics Shows the amplitude for red and blue wavelengths. Updates once per second.
Days remaining to clean Shows the number of days until the next scheduled manual cleaning.
Sensor life Shows the number of days until the next scheduled sensor cap replacement.
Error list
If an error occurs, the reading on the measurement screen flashes. Output behavior is determined by
controller settings. Refer to the controller manual for details.
To show the current sensor errors, go to MENU>SENSOR DIAGNOSTICS>[Select Sensor]>ERROR
LIST. Refer to Table 6.
Table 6 Error list for the LDO sensor
Error Possible cause Resolution
Red amplitude is too low. (Value is below
0.01)
or
Blue amplitude is too low. (Value is below
0.01)
The sensor cap is not
installed, or is not installed
correctly.
Remove the sensor cap and
install it again.
The light path is blocked in
the sensor cap.
Inspect the inside of the sensor
cap and lens.
The sensor is not operating
correctly.
Make sure that the LED is
flashing. Contact the
manufacturer.
Warning list
When the warning icon flashes (sc100 and sc200) or when the screen turns yellow (sc1000), a
message is shown on the bottom of the measurement screen. On the sc1000, the screen turns
yellow to show a warning. To show the current sensor warnings, go to MENU>SENSOR
DIAGNOSTICS>[Select Sensor]>WARNING LIST. Refer to Table 7.
Table 7 Sensor warning list
Warning Definition Resolution
EEPROM setup error Storage is corrupt. The values have
been set to the factory default.
Contact technical support.
EEPROM error
English 9

Hach LDO Specifications

General

Storage Temperature	-20 to 60 °C (-4 to 140 °F)
IP Rating	IP68
Range	0 to 20 mg/L
Accuracy	±0.1 mg/L or ±1% of reading, whichever is greater
Resolution	0.01 mg/L
Measurement Range	0 to 20 mg/L
Description	Luminescent Dissolved Oxygen (LDO) sensor
Response time	t95 < 30 seconds
Battery Life	N/A (powered externally)