Hach LDO101 User manual
DOC022.53.80021
LDO101
05/2021, Edition 4
User Manual
Table of Contents
Section 1 Product overview................................................................................. 3
Section 2 Specifications........................................................................................ 3
Section 3 Safety information............................................................................... 4
3.1 Intended use ....................................................................................................... 4
3.2 Use of hazard information..................................................................................... 4
3.3 Precautionary labels............................................................................................. 5
3.4 Product hazards.................................................................................................... 5
Section 4 Preparation for use.............................................................................. 5
Section 5 Calibration.............................................................................................. 6
5.1 Calibration notes................................................................................................... 6
5.2 LDO water-saturated air (100%) calibration procedure........................................ 7
Section 6 Sample measurement ...................................................................... 7
6.1 Sample measurement notes................................................................................. 7
6.2 Sample measurement procedure......................................................................... 8
Section 7 Maintenance........................................................................................... 8
7.1 Clean the probe.................................................................................................... 8
7.2 Replace the sensor cap and iButton..................................................................... 9
7.3 Remove or install the shroud................................................................................ 9
7.4 Storage............................................................................................................... 11
Section 8 Troubleshooting................................................................................. 12
Section 9 Consumables....................................................................................... 12
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Table of Contents
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Section 1 Product overview
The Intellical LDO101 series probes are digital, luminescent dissolved oxygen probes that measure
the dissolved oxygen concentration in wastewater, drinking water and general water samples. The
probes have temperature and absolute air pressure sensors for accurate dissolved oxygen
measurements. The standard probes are for laboratory use. The rugged probes are for field use.
Refer to Figure 1.
Note: For BOD applications, use the LBOD10101 probe, which has the LDO technology and a stirrer for
measurements in a BOD bottle.
Figure 1 Probe overview
1 LDO sensor cap 5 Pressure sensor module
2 Rugged probe 6 iButton®1
3 Standard probe 7 iButton compartment
4 Cable 8 Pressure sensor module cap
Section 2 Specifications
Specifications are subject to change without notice.
Specifications Details
Probe type Luminescent dissolved oxygen (LDO) probe
Dissolved oxygen range 0.1 to 20.0 mg/L (ppm); 1 to 200% saturation
1iButton is a registered trademark of Maxim Integrated Products, Inc.
English 3
Specifications Details
Dissolved oxygen accuracy ±0.1 mg/L for concentrations less than 8 mg/L
±0.2 mg/L for concentrations more than 8 mg/L
% saturation resolution 0.1%
Stabilization time T90% at 10 seconds (when the solution is stirred)
Temperature resolution 0.1 °C (0.18 °F)
Temperature accuracy ±0.3 °C (±0.54 °F)
Pressure resolution 1 mbar (1 hPa)
Pressure accuracy ±0.8%
Operating temperature 0 to 50 °C (32 to 122 °F)
Storage temperature 0 to 40 °C (32 to 104 °F)
Minimum immersion depth 25 mm (0.98 in.)
Dimensions (standard) Diameter: 29 mm (1.14 in.)
Length: 191 mm (7.52 in.)
Cable length: LDO10101: 1 m (3.28 ft); LDO10103: 3 m (9.84 ft)
Dimensions (rugged) Diameter: 46 mm (1.8 in.)
Length: 223 mm (8.7 in.)
Cable length: LDO10105: 5 m (16.4 ft); LDO10110: 10 m (32.8 ft);
LDO10115: 15 m (49.2 ft); LDO10130: 30 m (98.4 ft)
Cable connection M12 digital output and connector
Warranty 3 years on the probe, 1 year on the sensor cap. This warranty covers
manufacturing defects, but not improper use or wear.
Certifications CE, FCC/ISED
Section 3 Safety information
3.1 Intended use
The Intellical probes are intended for use by individuals who measure water quality parameters in the
laboratory or in the field. The Intellical probes do not treat or alter water.
3.2 Use of hazard information
D A N G E R
Indicates a potentially or imminently hazardous situation which, if not avoided, will result in death or
serious injury.
WARNING
Indicates a potentially or imminently hazardous situation which, if not avoided, could result in death
or serious injury.
CAUTION
Indicates a potentially hazardous situation that may result in minor or moderate injury.
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N O T I C E
Indicates a situation which, if not avoided, may cause damage to the instrument. Information that
requires special emphasis.
3.3 Precautionary labels
Read all labels and tags attached to the instrument. Personal injury or damage to the instrument
could occur if not observed. A symbol on the instrument is referenced in the manual with a
precautionary statement.
Electrical equipment marked with this symbol may not be disposed of in European
domestic or public disposal systems. Return old or end-of-life equipment to the
manufacturer for disposal at no charge to the user.
3.4 Product hazards
CAUTION
Chemical exposure hazard. Obey laboratory safety procedures and wear all of the
personal protective equipment appropriate to the chemicals that are handled. Refer to
the current safety data sheets (MSDS/SDS) for safety protocols.
CAUTION
Chemical exposure hazard. Dispose of chemicals and wastes in accordance with local,
regional and national regulations.
Section 4 Preparation for use
Prepare the probe for calibration and measurement as follows. Do not touch the protective black
layer on the LDO sensor cap.
1. Remove the shroud. Refer to Remove or install the shroud on page 9.
2. Open the pressure sensor module cap and make sure that the label on the iButton is on top.
3. Make sure that the LDO sensor cap and iButton label have the same lot code. Refer to Figure 2.
4. Install the LDO sensor cap and tighten by hand. Do not tighten more than is necessary for a good
seal.
5. Soak the probe in 100 mL of tap water for 30 minutes before use. For probes that will be in
aqueous solutions for more than 6 hours continuously, soak the probe for 72 hours.
Note: After 72 hours, the LDO sensor cap is fully hydrated.
6. Make sure that the meter has the correct date and time settings. The service-life time stamp in
the probe comes from the date and time settings in the meter.
Note: Some meters automatically open the date and time settings when the meter starts for the first time, or
after battery replacement.
7. Connect the probe to the meter.
8. Install the shroud. Refer to Remove or install the shroud on page 9.
Note: Make sure to install the shroud during field use to prevent damage to the sensing elements. The product
warranty does not include such damage.
English 5
Figure 2 Compare lot number
Section 5 Calibration
The procedure that follows is applicable to meters that can connect to Intellical LDO probes. Refer to
the applicable meter documentation for meter operation and probe-specific settings.
5.1 Calibration notes
Read the notes that follow before calibration.
• Measure samples as soon as possible after collection.
• Remove the shroud before calibration. Refer to Remove or install the shroud on page 9.
• The factory calibration is sufficient for most applications. If necessary, set the probe to use a
different calibration option in the probe settings menu.
• Use the single display mode for calibration when more than one probe is connected to the meter (if
applicable).
• Calibrate the probes and verify the calibration regularly for best results. Use the meter to set
calibration reminders.
• The calibration data is stored in the probe. When a calibrated probe is connected to a different
meter with the same calibration options, a new calibration is not necessary.
• Air bubbles below the sensor when in solution can cause a slow response or error in the
calibration. Make sure to remove air bubbles during calibration.
• The meter uses the slope value shown at the end of the calibration to monitor the condition of the
sensor cap.
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5.2 LDO water-saturated air (100%) calibration procedure
1. Fill a BOD bottle
¼ full with water.
2. Put a stopper on
the bottle and shake
for 30 seconds.
3. Rinse the probe
with deionized water.
Dry the probe with a
lint-free cloth.
4. Put the probe in
the bottle. Wait
10 minutes or more
(30 minutes for best
results) for the
contents to adjust to
ambient
temperature.
5. Go to the
calibrate menu.
Select the probe, if
applicable.
6. Read the
dissolved oxygen
value. The display
shows 100% when
the reading is stable.
7. Save the
calibration.
Section 6 Sample measurement
The procedure that follows is applicable to meters that can connect to Intellical LDO probes. Refer to
the applicable meter documentation for meter operation and probe-specific settings.
6.1 Sample measurement notes
Read the notes that follow before sample measurements.
• Do not submerge the pressure sensor module.
• Salinity changes the solubility of oxygen in water. Measure the sample salinity and enter the value
in the probe settings of the meter.
• To decrease the measurement time, condition the probe and try different stir rates.
• Rinse the probe with deionized water and dry with a lint-free cloth between measurements to
prevent contamination.
• If complete traceability is necessary, enter a sample ID and operator ID before measurement.
Refer to the meter manual for instructions.
• The meter automatically saves the measurement data when the user manually reads each data
point and when the meter is set to read at regular intervals. The user must manually save each
data point when the meter is set to read continuously.
• Air bubbles below the sensor can cause a slow response or error in the measurement. Make sure
to remove air bubbles before and during measurements.
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• Make sure to install the shroud before field use to prevent damage to the sensing elements. Refer
to Remove or install the shroud on page 9. The probe warranty does not include such damage.
• To deploy a rugged probe at a distance, toss the probe body with a slow underhand throw. Do not
throw the probe by the cable to prevent damage to cable, the probe or the user.
6.2 Sample measurement procedure
1. Rinse the probe
with deionized water.
Dry the probe with a
lint-free cloth.
Rugged probes:
install the shroud.
2. Put the probe in
the sample 25 mm
(1 inch) or more. Do
not put the probe on
the bottom or sides
of the container. Stir
the sample at a
moderate rate or put
the probe in flowing
conditions.
3. Shake the probe
from side to side to
remove air bubbles.
Rugged probes:
move the probe up
and down to remove
air bubbles.
4. Stir gently, then
read the dissolved
oxygen value of the
sample. The display
shows the dissolved
oxygen value when
the reading is stable.
Section 7 Maintenance
7.1 Clean the probe
N O T I C E
The LDO sensor cap has a protective black layer to increase the life of the LDO sensor. Do not rub
the black layer to clean the LDO sensor cap. Do not use alcohol or other organic solvents to clean
the LDO sensor cap.
Keep the LDO sensor cap clean for best results. Use only water and neutral detergents to clean the
probe.
1. Remove the shroud. Refer to Remove or install the shroud on page 9.
2. If water is seen between the LDO sensor cap and lens:
a. Remove the LDO sensor cap.
b. Blot dry the LDO sensor cap and lens with a soft dry cloth. Refer to Figure 3.
If the probe lens is dirty, rinse the lens with dilute isopropyl alcohol (10% or less) or deionized
water. Blot dry with a non-abrasive cloth. Do not rub the lens or use abrasive cleaners.
c. Install the LDO sensor cap and tighten by hand. Do not tighten more than is necessary for a
good seal.
3. Put the probe in a neutral cleaning solution and stir the solution. Do not rub or remove the black
layer on the LDO sensor cap.
Note: If disinfection is necessary, put the probe in a dilute alcohol solution for a maximum of 2 minutes and
rinse immediately with deionized water. Do not use an alcohol solution more than two times a day.
4. Rinse the probe with deionized water. Blot dry with a lint-free cloth.
5. Install the shroud. Refer to Remove or install the shroud on page 9.
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