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.
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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.
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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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Figure 3 Probe exploded view
1 Shroud 7 Probe lens
2 Locking ridges (8x) 8 Cap seal
3 Locking rib 9 Temperature sensor
4 Locking ring 10 Locking groove
5 LDO sensor cap 11 Locking ribs (4x)
6 O-ring
7.2 Replace the sensor cap and iButton
Replace the LDO sensor cap after 365 days, or more frequently if the cap becomes damaged or
dirty. The LDO sensor cap and iButton operate together and must be replaced at the same time.
Keep the shroud on the probe during use to prevent damage to the LDO sensor cap. Refer to the
instructions that are supplied with the LDO sensor cap replacement kit.
7.3 Remove or install the shroud
Remove the shroud during calibration and maintenance. Refer to Figure 4. Keep the shroud installed
on the probes during sample measurements to prevent damage to the LDO sensor cap. Refer to
Figure 5.
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Figure 4 Remove the shroud
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Figure 5 Install the shroud
7.4 Storage
The storage conditions for the LDO probe can be dry, wet, or humid. Wet storage conditions help to
keep the LDO sensor cap fully hydrated.
Note: After 72 hours of storage in tap water, the LDO sensor cap is fully hydrated.
For daily measurements in the laboratory, keep the probe in a humid environment such as a BOD
bottle filled approximately ¼ full with tap water. If the probe is used to monitor DO concentrations
continuously for more than 6 hours, keep the probe in tap water.
When the probe is used for short periods (less than 6 hours), the storage can be dry. Before dry
storage, rinse the probe in deionized water and blot dry. Soak the probe in tap water for 30 minutes
before use.
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Section 8 Troubleshooting
Problem Possible cause Solution
Decreased probe performance
causes slow stabilization and
prevents accurate calibrations
or measurements.
The sensor cap is loose or
damaged.
Tighten or replace the sensor cap.
Always replace the sensor cap and
the iButton at the same time. Refer
to Replace the sensor cap and
iButton on page 9.
Water is between the
sensor cap and the probe
lens.
Remove the sensor cap and dry the
probe lens. Refer to Clean the probe
on page 8.
The sensor cap is not
sufficiently conditioned.
Keep the probe in the BOD bottle
with some water for more time, then
try the calibration again.
The temperature or
pressure sensor does not
operate correctly.
Compare the temperature and
pressure readings of the probe with
external measurements. The
pressure sensor reads absolute
pressure, which is not adjusted to
sea level. If the measurements are
not correct, contact technical
support.
The lot code on the iButton
is not the same as the lot
code on the sensor cap.
Replace the sensor cap and iButton.
Sample properties cause slow
stabilization or inaccurate
measurements.
The measurement was not
adjusted for salinity in the
sample.
Measure the salinity of the sample
and enter the value as a salinity
correction factor in the meter.
Procedure problem causes
slow stabilization and prevents
accurate calibrations or
measurements.
Air bubbles are around or
below the probe tip.
Carefully tap or shake the probe to
remove air bubbles.
The LDO sensor cap is in
direct sunlight.
Install the protective shroud.
The calibration mode in the
meter is set to factory.
If user calibration is necessary,
change the calibration mode in the
meter.
Section 9 Consumables
Note: Product and Article numbers may vary for some selling regions. Contact the appropriate distributor or refer to
the company website for contact information.
Description Quantity Item no.
LDO sensor cap replacement kit (includes iButton) 1 5811200
BOD bottle with glass stopper, 300 mL 1 62100
Beaker, 250 mL, polypropylene 1 108046
Probe stand for standard Intellical probes 1 8508850
Probe cable depth markers for rugged Intellical probes 5/pkg 5828610
Disposable wipes, 11 x 22 cm 280/pkg 2097000
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Section 9 Consumables (continued)
Description Quantity Item no.
Wash bottle, polyethylene, 500 mL 1 62011
Shroud kit for standard LDO probes 1 5832500
Shroud kit for rugged probes 1 5825900
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*DOC022.53.80021*
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