Hach LDO Addendum-Operation

Operation
Configure the sensor
Use the Settings menu to enter identification information for the sensor and to change options for
data handling and storage.
For information about sensor installation, refer to the user manual.
Make sure that all of the Settings menu values are correct for the application.
1. Go to MENU>SENSOR SETUP>[Select Sensor]>SETTINGS.
2. Select an option, ENTER. The list of available options is shown in the table below.
Option Description
Name Changes the name that corresponds to the sensor on the top of the measure screen.
The name is limited to 10 characters in any combination of letters, numbers, spaces or
punctuation.
Unit Temperature–Sets the temperature units to °C (default) or °F.
Measurement–Set the measurement units in mg/L, ppm or % .
Altitude/Pressure–Set the altitude in m or ft, or set the atmospheric pressure units in
mmHg or torr. (Default value = 0 ft)
Altitude/Pressure Enter the value of the altitude or atmospheric pressure. This value must be accurate to
complete % saturation measurements and calibration in air. (Default = 0 ft).
Salinity Enter the salinity value. Salinity range: 0.00 to 250.00 parts per thousand (‰). (Default
value = 0)
Signale average Set the time interval to average signal in seconds
Cleaning interval Set the time interval for manual sensor cleaning in days (Default value = 0 days. A value
of 0 days disables the clean interval.)
Reset cleaning interval Set the time interval to the last saved clean interval
Data logger interval Sets the time interval for data storage in the data log—0.5, 1, 2, 5, 10, 15 (default), 30,
60 minutes.
Reset Restores the configurable default values for the sensor. Does not change the setting for
slope or offset.
Enter the atmospheric pressure value
The factory setting for atmospheric (air) pressure is 0 ft, or sea level. To change the default value,
use the steps in this procedure. The adjustment for air pressure is entered as either elevation or as
pressure units (preferred).
Note: Accurate air pressure is critical for saturated air calibration. Use only absolute pressure, not adjusted. If the
absolute air pressure is not known, use the correct elevation for the location.
1. Go to MENU>SENSOR SETUP>[Select Sensor]>SETTINGS>UNIT>AIR
PRESSURE/ALTITUDE.
2. Select one of the unit options listed:
Option Description
Altitude ft Feet—unit of measure for elevation
Altitude m Meters—metric unit of measure for elevation
Air pressure mmHg Millimeters of mercury—metric unit of measure for absolute air pressure
Air pressure torr Unit of measure for absolute air pressure
English 3

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)