Hach PHC745 User Manual
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Hach PHC745 User Manual

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DOC022.53.80435
PHC745
05/2021, Edition 2
User Manual

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  • Page 1 DOC022.53.80435 PHC745 05/2021, Edition 2 User Manual...

  • Page 3: Table Of Contents

    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 ................
  • Page 4 Table of Contents...

  • Page 5: Section 1 Product Overview

    Section 1 Product overview The Intellical PHC745 pH probes are digital, combination electrodes that measure the pH of water samples. The glass sleeve junction keeps the reference junction clean for measurements in wastewater influent, emulsions and viscous liquids. The probes use the Red Rod technology and a saturated KCl electrolyte for high performance.

  • Page 6: Section 3 Safety Information

    Specifications Details Sodium (alkalinity) error <0.3 pH at pH 13 in 0.1 M NaOH Temperature accuracy ±0.3 °C (±0.54 °F) Temperature sensor type 30 kΩ NTC thermistor Operating temperature –10 to 110 °C (14 to 230 °F) Storage temperature 5 to 40 °C (41 to 104 °F) Minimum immersion depth 18 mm (0.71 in.) Body material Glass...

  • Page 7: Precautionary Labels

    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.
  • Page 8 8. 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.

  • Page 9: Operate The Sleeve Junction

    Figure 3 Probe position during use 1 Filling hole 3 Level of calibration solution or sample 2 Level of electrolyte filling solution 4 Sleeve junction 4.1 Operate the sleeve junction N O T I C E Close the sleeve junction and fill the electrolyte after each use. The probe can become permanently damaged if all of the electrolyte drains from the probe.

  • Page 10: Section 5 Calibration

    Figure 4 Sleeve junction operation Section 5 Calibration The procedure that follows is applicable to meters that can connect to Intellical pH 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: •...

  • Page 11: Calibration Procedure

    5.2 Calibration procedure 1. Go to the 2. Prepare or pour 3. Open the filling 4. Rinse the probe calibrate menu. the pH buffer hole. with deionized water. Select the probe, if solutions in different Dry the probe with a applicable.

  • Page 12: Section 6 Sample Measurement

    Section 6 Sample measurement The procedure that follows is applicable to meters that can connect to Intellical pH probes. Refer to the applicable meter documentation for meter operation and probe-specific settings. 6.1 Sample requirements N O T I C E Make sure that the sample type is compatible with the probe, or probe damage can occur.

  • Page 13: Section 7 Verify The Calibration

    5. Shake the probe 6. Stir gently, then from side to side to read the pH value of refresh the reference the sample. The junction and remove display shows the air bubbles. temperature- compensated pH Note: Be careful to not value when the hit the beaker and reading is stable.

  • Page 14: Section 8 Maintenance

    5. Loosen the 6. Shake the probe 7. Stir gently, then sleeve junction. Put from side to side to read the pH value of the probe in the pH refresh the reference the buffer solution. buffer solution with junction and remove The meter accepts the sensor and air bubbles.

  • Page 15: Clean The Sleeve Junction

    Table 1 Cleaning solution (continued) Contamination Cleaning solution Active component Soak time Proteins Electrode cleaning solution for Pepsin in HCl 3 hours maximum proteins/organic contamination Wastewater and Electrode cleaning solution, Sodium hypochlorite 5–10 minutes organic compounds extra strong 8.1.1 Clean the sleeve junction Clean the sleeve junction when the sleeve junction does not move correctly.

  • Page 16: Fill The Probe

    8.2 Fill the probe Add electrolyte filling solution to the probe regularly to make sure that the electrolyte flows from the probe to the sample. Refer to Figure 6. Make sure to use the correct filling solution (saturated KCl). Note: If the dispensing tip becomes clogged, remove the dispensing tip and soak the tip in warm water. Then, fully dry and assemble the tip again.
  • Page 17 Figure 7 Items to collect 1 Plastic pipet 4 Mixing bottle 2 Measuring scoop 5 Saturated KCl solution 3 KCl crystals Table 2 KCl quantity at high temperatures Temperature KCl quantity 60 °C (140 °F) 0.5 g (0.5 cm (0.2 in.)) 70 °C (158 °F) 0.625 g 80 °C (176 °F)

  • Page 18: Replace The Filling Solution

    Figure 8 Add KCl crystals to the probe 8.4 Replace the filling solution Replace the filling solution and KCl crystals when one of the conditions that follow occurs: • The filling solution becomes contaminated. • The KCl crystals in a probe do not move freely through the liquid when the probe is inverted. 1.

  • Page 19: Soak Procedure For Dry Probes

    6. Add new KCl crystals to the probe until there is approximately 0.5 cm (0.2 in.) of crystals above the glass bulb. Refer to Figure 8 on page 16. 7. Fill the probe with new filling solution. Refer to Fill the probe on page 14.

  • Page 20: Section 9 Troubleshooting

    Section 9 Troubleshooting Keep the probe clean and in the recommended storage solution when not in use for the best accuracy, stabilization time and life of the probe. Problem Possible cause Solution The glass sensor is dirty. Clean and condition the probe. Refer to Clean the probe on page 12.

  • Page 21: Section 10 Consumables

    Problem Possible cause Solution The filling hole is closed. Open the filling hole during use. Air bubbles are around or Carefully tap or shake the below the probe tip. probe to remove air bubbles. The electrical connection Loosen the sleeve junction through the reference junction more.

  • Page 22: Accessories

    10.1 Recommended standards (continued) Description Unit Item no. pH color-coded buffer solution kit (NIST), 500 mL, includes: 2947600 pH 4.01 ± 0.02 pH buffer (NIST) 500 mL 2283449 pH 7.00 ± 0.02 pH buffer (NIST) 500 mL 2283549 pH 10.01 ± 0.02 pH buffer (NIST) 500 mL 2283649 Powder pillows:...
  • Page 23 10.2 Accessories (continued) Description Quantity Item no. Wash bottle, polyethylene, 500 mL 62011 Probe stand for standard Intellical probes 8508850 Storage protection tube LZW9161.99 Plastic transfer pipet, 5 mL 20/pkg 2749320 Measuring scoop, 1 g (0.04 oz) each 2657201 Bottle, mixing, round with cap each 1862400 English 21...
  • Page 24 22 English...
  • Page 26 Tel. +49 (0) 2 11 52 88-320 SWITZERLAND Fax (970) 669-2932 Fax +49 (0) 2 11 52 88-210 Tel. +41 22 594 6400 orders@hach.com info-de@hach.com Fax +41 22 594 6499 www.hach.com www.de.hach.com © Hach Company/Hach Lange GmbH, 2014, 2021. All rights reserved.

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