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DOC022.53.80028
ISEF121
05/2021, Edition 5
User Manual

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Summary of Contents for Hach ISEF121 Series

  • Page 1 DOC022.53.80028 ISEF121 05/2021, Edition 5 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 ..................... 4 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 ISEF121 series probes are digital, combination ion-selective electrodes (ISE) that measure the concentration of fluoride in wastewater, drinking water and general water samples. The probes have a built-in temperature sensor, a non-refillable gel reference and non-replaceable membranes.
  • Page 6: Section 3 Safety Information

    Specifications Details Minimum sample volume 25 mL Minimum immersion depth 25.4 mm (1 in.) Body material (standard) Epoxy Sensor material Solid-state LaF crystal Reference electrolyte Non-refillable Dritek gel reference element Cable connection M12 digital output and connector Dimensions Diameter: 12 mm (0.47 in.) Length: 175 mm (6.9 in.) total;...
  • Page 7: Product Hazards

    3.4 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.
  • Page 8: Calibration Procedure

    5.2 Calibration procedure 1. Go to the 2. Add 25 mL of 3. Add one Fluoride 4. Add a stir bar to calibrate menu. each standard Ionic Strength the first standard Select the probe, if solution to plastic Adjustor (ISA) solution.
  • Page 9: Section 6 Sample Measurement

    Section 6 Sample measurement The procedure that follows is applicable to meters that can connect to Intellical ISE 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. •...
  • Page 10: Low-Level Measurements

    5. Put the probe in 6. Shake the probe 7. Stir for 30 to the sample with the from side to side to 60 seconds, then sensor fully in the refresh the reference read the fluoride sample. Do not put junction and remove concentration of the the probe on the...
  • Page 11: Section 7 Verify The Calibration

    probe response when the level of hydroxide is more than 10% of the level of fluoride. The error increases with an increase in pH and a decrease in fluoride. When the Fluoride ISA is added to standards and samples, the pH is buffered between 5.0 and 5.5, which prevents interference from hydroxide ion.
  • Page 12: Section 8 Maintenance

    5. Rinse the probe 6. Put the probe in 7. Shake the probe 8. Stir for 30 to with deionized water. the standard solution from side to side to 60 seconds, then Dry the probe with a with the sensor fully remove air bubbles.
  • Page 13: Section 9 Troubleshooting

    Section 9 Troubleshooting Refer to Table 2 for general troubleshooting information. To check the probe performance, refer to Slope check on page 12. To check the accuracy of sample measurements, refer to Standard additions check on page 12. Table 2 Troubleshooting information Problem Possible cause Solution...
  • Page 14: Slope Check

    9.1 Slope check Use the mV value of two standard solutions to make sure the probe gives the correct slope. 1. Prepare two standard solutions that are ten times apart in concentration (e.g., 1 mg/L and – 10 mg/L F ).
  • Page 15: Section 10 Consumables

    Section 10 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. Fluoride Ionic Strength Adjustor Powder Pillows 100/pkg 258999 Fluoride Ionic Strength Adjustor Solution 3.78 L 2829017 Fluoride Standard Solution, 0.5 mg/L as F...
  • Page 16 14 English...
  • Page 18 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, 2010-2011, 2013, 2021. All rights reserved.

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