HACH CDC401 Laboratory 4 Poles Graphite Conductivity Cell User Manual

HACH CDC401 Laboratory 4 Poles Graphite Conductivity Cell

Product overview

The Intellical CDC401 series conductivity probes are digital electrodes that measure the electrical conductivity, salinity, resistivity or total dissolved solids (TDS) of wastewater, drinking water and general water samples. The probes have a graphite, 4-pole conductivity cell and a temperature sensor. The standard probes are for laboratory use. The rugged probes are for field use. Refer to Figure 1.

1. Temperature sensor and conductivity cell
2. Standard probe
3. Shroud (rugged model)
4. Rugged probe

Specifications

Specifications are subject to change without notice.

20.0 to 199.9 μS/cm: 0.1 μS/cm 200 to 1999 μS/cm: 1 μS/cm

2.00 to 19.99 mS/cm: 0.01 mS/cm

20.0 to 200.0 mS/cm: 0.1 mS/cm

Conductivity accuracy| ±0.5% of reading
TDS (total dissolved solids) range| 0 to 50,000 mg/L as NaCl
TDS resolution| 0.0 to 19.99 mg/L: 0.01 mg/L

200 to 1999 mg/L: 1 mg/L

2.00 to 19.99 g/L: 0.01 g/L

20.0 to 50.0 g/L: 0.1 g/L

Length: 174 mm (6.9 in.) total; 90 mm (3.5 in.) below head

Cable length: CDC40101: 1 m (3.3 ft); CDC40103: 3 m (9.8 ft)

Dimensions (rugged)| Diameter: 46 mm (1.8 in.)

Length: 223 mm (8.7 in.)

Cable length: CDC40105: 5 m (16.4 ft); CDC40110: 10 m (32.8 ft); CDC40115: 15 m (49.2 ft); CDC40130: 30 m (98.4 ft)

Warranty| 1 year on the probe. This warranty covers manufacturing defects, but not improper use or wear.
Certifications| CE, FCC/ISED

Safety information

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.

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.

W A R N I N G
Indicates a potentially or imminently hazardous situation which, if not avoided, could result in death or serious injury.

C A U T I O N
Indicates a potentially hazardous situation that may result in minor or moderate injury.

N O T I C E
Indicates a situation which, if not avoided, may cause damage to the instrument. Information that requires special emphasis.

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.

Product hazards

C A U T I O N
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.

C A U T I O N
Chemical exposure hazard. Dispose of chemicals and wastes in accordance with local, regional and national regulations.

Preparation for use

Prepare the probe as follows.

1. Rinse the probe with deionized water. Blot dry with a lint-free cloth.

2. 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.

3. Connect the probe to the meter.

Calibration

The procedure that follows is applicable to meters that can connect to Intellical conductivity probes. Refer to the applicable meter documentation for meter operation and probe-specific settings.

Calibration notes
Read the notes that follow before calibration.

• Do not dilute conductivity standards or samples.
• The meter shows the conductivity standard solution to use for calibration. If necessary, change the standard solution in the probe settings menu.
• The conductivity value changes with temperature. The default probe settings apply a temperature correction to adjust the conductivity measurements to the value at 25 °C.
• Use the default calibration options or change the options 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.
• If the rugged probe does not easily go in the calibration container, remove the shroud. Refer to Remove or install the shroud on page 9.

Calibration procedure

1. Go to the calibrate menu. Select the probe, if applicable. The display shows the conductivity standard solution to use for calibration.

2.  Pour the fresh standard solution into a beaker.

3. Rinse the probe with deionized water. Dry the probe with a lint-free cloth.

4. Put the probe in the standard solution with the sensor fully in the solution. Do not put the probe on the bottom or sides of the beaker.
   

5.  Shake the probe from side to side to remove air bubbles.

6.  Stir gently, then read the conductivity value of the standard solution. The display shows the temperature-corrected conductivity value when the reading is stable.

7. Save the calibration.
   

Sample measurement

The procedure that follows is applicable to meters that can connect to Intellical conductivity probes. Refer to the applicable meter documentation for meter operation and probe-specific settings.

Sample measurement notes
Read the notes that follow before sample measurements.

•  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 can show the measured value as conductivity, TDS (total dissolved solids), salinity or resistivity. Use the probe settings menu to change the parameter.
•  If the probe is used to measure the salinity value for dissolved oxygen measurements, change the parameter to salinity.
•  The conductivity value changes with temperature. The default probe settings apply a temperature correction to adjust the conductivity measurements to the value at 25 °C.
• 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.
•  If the probe is a rugged type, 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.

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 with the sensor fully in the sample. Do not put the probe on the bottom or sides of the beaker.

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 conductivity (or TDS, salinity, resistivity) value of the sample. The display shows the temperature-corrected value when the reading is stable.
   

Verify the calibration

Measure the value of a fresh conductivity standard solution to make sure the result is accurate. The meter compares the selected standard solution value to the measured value and accepts or rejects the measurement. The user can change the standard solution and acceptance criteria for verification in the probe- specific settings.
Note: Password protection may prevent access to the acceptance criteria.

Verification procedure

1.  Go to the verification menu. The display shows the standard solution to use for verification.
   Note: Menu name for HQd meters: Run check standard.

2. Pour the fresh standard solution into a beaker.

3. Rinse the probe with deionized water. Dry the probe with a lint-free cloth.

4.  Put the probe in the standard solution with the sensor fully in the solution. Do not put the probe on the bottom or sides of the beaker.
   

5.  Shake the probe from side to side to remove air bubbles.

6. Stir gently, then read the conductivity value of the standard solution. The meter accepts or rejects the result.

Maintenance

Clean the probe
Clean the probe regularly to remove mineral or sample buildup on the electrodes. Symptoms of contamination:

• Incorrect or irregular readings
• Slow stabilization times
• Calibration errors
• Sample material stays on the probe

1. Rinse the probe with deionized water. Dry the probe body with a lint-free cloth.
   Note: Remove the shroud on a rugged probe before cleaning. Install the shroud after the probe is clean. Refer to Remove or install the shroud on page

3. Soak the probe in the applicable cleaning solution for the specified time. Refer to Table 1.

4. Rinse or soak the probe for 1 minute in deionized water. Dry the probe body with a lint-free cloth.

Table 1 Cleaning solution

Contamination| Cleaning solution| Active component| Soak time
---|---|---|---
General contamination| Electrode cleaning solution for regular maintenance| KATHON™ CG, DECONEX®11| 12–16 hours
Minerals| Electrode cleaning solution for minerals/inorganic contamination| Phosphoric acid (~10%)| 10–15 minutes
Fats, grease and oils| Electrode cleaning solution for fats, oils and grease contamination| KATHON™ CG, TRITON® X| 2 hours maximum
Proteins| Electrode cleaning solution for proteins/organic

contamination

| Pepsin in HCl| 3 hours maximum
Wastewater and organic compounds| Electrode cleaning solution, extra strong| Sodium hypochlorite| 5–10 minutes

Remove or install the shroud
Remove the shroud on the rugged probe during calibration and maintenance. Refer to Figure 2. Keep the shroud installed on the rugged probe during sample measurements to prevent damage to the sensor. Refer to Figure 3.

Storage
Between uses, make sure the probe is dry and store it in ambient conditions. Rugged probes may be stored with the shroud installed if the storage container is sufficiently large.

Troubleshooting

Decreased probe performance causes slow stabilization and prevents accurate calibrations or measurements.| The probe has mineral or sample buildup on the electrodes.| Clean the probe. Refer to Clean the probe on page 8.
Sample properties cause slow stabilization or inaccurate measurements.| The sample absorbs carbon dioxide (CO2) from the air, which forms carbonic acid and slowly increases the conductivity in low ionic strength (LIS) or high purity samples.| Use the LIS chamber for LIS/high purity samples to prevent CO2 absorption.
Procedure problem causes slow stabilization and prevents accurate calibrations or measurements.| An incorrect standard solution was used or the standard solution is contaminated.| Use the specified standard solution of good quality.
Air bubbles are around or below the probe tip.| Carefully tap or shake the probe to remove air bubbles.
The conductivity settings in the meter are not correct.| Make sure that the settings for temperature correction, reference temperature and stability are correct.

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.

2975149
Electrode cleaning solution for proteins/organic contamination| 250 mL| C20C370
Electrode cleaning solution for fats, oils and grease contamination| 500 mL| 2964449
Electrode cleaning solution, extra strong| 250 mL| S16M002
Conductivity standard solution (KCl), 147 µS/cm, Singlet one-use packets, 20 mL each| 20/pkg| 2771320
Conductivity standard solution (KCl), 1413 µS/cm, Singlet one-use packets, 20 mL each| 20/pkg| 2771420
Conductivity standard solution (KCl), 12.88 mS/cm, Singlet one-use packets, 20 mL each| 20/pkg| 2771520
Sodium chloride standard solution, 180 (± 10) µS/cm, 90 (± 1) mg/L TDS| 100 mL| 2307542
Sodium chloride standard solution, 1000 (± 10) µS/cm, 500 (± 5) mg/L TDS| 100 mL| 1440042
Sodium chloride standard solution, 1990 (± 20) µS/cm, 995 (± 10) mg/L TDS| 100 mL| 210542
Sodium chloride standard solution, 18,000 (± 50) µS/cm, 9000 (± 25) mg/L TDS| 100 mL| 2307442
Wash bottle, polyethylene, 500 mL| 1| 62011
Disposable wipes, 11 x 22 cm| 280/pkg| 2097000
Beaker, 30 mL, plastic, colorless| 80/pkg| SM5010
Beaker, 100 mL, polypropylene| 1| 108042
Probe cable depth markers for rugged Intellical probes| 5/pkg| 5828610
Probe stand for standard Intellical probes| 1| 8508850
Shroud kit for rugged probes| 1| 5825900

HACH COMPANY World Headquarters
P.O. Box 389, Loveland, CO 80539-0389 U.S.A.
Tel. 970-669-3050
800-227-4224 (U.S.A. only)
Fax 970-669-2932
orders@hach.com
www.hach.com

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D-40549 Düsseldorf, Germany
Tel. +49 (0) 2 11 52 88-320
Fax +49 (0) 2 11 52 88-210 info-de@hach.com
www.de.hach.com

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