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Hanna Instruments HI 4101 Instruction Manual
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Hanna Instruments HI 4101 Instruction Manual

Ammonia ion selective electrode
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Instruction Manual
HI 4101
HI 4101
HI 4101
HI 4101
HI 4101
Ammonia
Ion
Selective Electrode
1

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Summary of Contents for Hanna Instruments HI 4101

  • Page 1 Instruction Manual HI 4101 HI 4101 HI 4101 HI 4101 HI 4101 Ammonia Selective Electrode...
  • Page 3 HI 4101 Ammonia Electrode HI 4101 Ammonia Electrode HI 4101 Ammonia Electrode HI 4101 Ammonia Electrode HI 4101 Ammonia Electrode I. I. I. I. I. Introduction: Introduction: Introduction: Introduction: Introduction: The Hanna HI 4101 Ammonia gas selective electrode is a combination electrode designed for the measurement of ammonia in aqueous solutions such as waste water samples, wine, beer.
  • Page 4 III. III. III. III. III. Theory of Operation Theory of Operation Theory of Operation : : : : : Theory of Operation Theory of Operation The ammonia electrode is a complete potentiometric cell that contains both a silver/silver chloride (Ag/AgCl) refer- ence and a pH measurement element.
  • Page 5 IV. IV. IV. IV. IV. Design Elements Design Elements Design Elements Design Elements Design Elements The Hanna HI 4101 ammonia gas sensor has 3 main parts. These are the membrane/membrane cap, outer probe body with antirotation key and the pH/reference assembly which includes the outer electrode cap, spring, inner cap and pH/reference electrode assembly.

  • Page 6: Equipment Required

    V. V. V. V. V. Equipment Required: Equipment Required: Equipment Required: Equipment Required: Equipment Required: Hanna HI 4222 pH/ISE/mV meter or other suitable ion or pH/mV meter. (Note: log/linear graph paper is useful if an ISE meter is not available). Hanna HI 180 magnetic stirrer or equivalent with stirring bars.
  • Page 7 ions are capable of reducing the ammonia concentration. If other volumes of sample/standard are used, add ISA at 2 parts per 100 parts standard/sample. VII VII VII VII VII. General Guidelines General Guidelines General Guidelines General Guidelines General Guidelines Calibration standards and sample solutions should have the same ionic strength.
  • Page 8 VIII. VIII. Inner Electrode Check Inner Electrode Check VIII. VIII. Inner Electrode Check VIII. Inner Electrode Check Inner Electrode Check first time first time Before assembling the electrode for the first time first time first time or if reactivating it after storage, the inner electrode assembly should be conditioned and then tested as a pH electrode.

  • Page 9: Electrode Preparation

    If sensor has been stored or shipped dry, it should be “conditioned” by soaking the pH/reference assem- bly 1 hour or more in one of the pH test solutions. Avoid touching the pH glass with your fingers. Attention: The pH/reference assembly is fragile! Support the upper portion of the internal cell while immersing the glass and reference assembly.
  • Page 10 3) Hold one corner against the threads with thumb while gently stretching membrane over opening and cap- turing opposite membrane corner against threads . Smooth excess membrane material around the threads. 4) Screw outer membrane cap onto body thus capturing the membrane between the cap and outer body threads.
  • Page 11 5.) Using dropper provided, add about 2 mL of ammo- nia internal electrolyte HI 4001-40 into outer probe body. 6) Insert and position the inner glass/reference assem- bly into the outer body so that the anti-rotation key sits in the cut out on the outer probe body. HI 4101 HI 4101 7) Holding the electrode upright, slide spring and elec-...
  • Page 12 X. X. X. X. X. Quick Check of Electrode Slope Quick Check of Electrode Slope Quick Check of Electrode Slope Quick Check of Electrode Slope Quick Check of Electrode Slope Connect BNC (connector) to pH/mV/ISE meter. Place meter in mV mode. Place 100 mL of deionized water into a vessel with stir bar.
  • Page 13 XII. XII. XII. XII. Sample Handling Sample Handling Sample Handling XII. Sample Handling Sample Handling Keep samples stored in tightly covered bottles to pre- vent ammonia loss or ammonia contamination from other sources. Alkaline samples must be measured at once or acidi- fied for storage.
  • Page 14 XIII. XIII. Direct Calibration and Measurement Direct Calibration and Measurement XIII. Direct Calibration and Measurement Direct Calibration and Measurement XIII. XIII. Direct Calibration and Measurement The direct method can be used in the linear working re- gions of the sensor. (See figure for typical sensor response). A direct reading ISE meter (HI 4222 or equivalent) deter- mines concentration of the unknown by a direct reading after calibrating the meter with the standards.
  • Page 15 Standards should bracket the measurement range of interest and differ from each other by a factor of 10 in the linear regions. Standards and solutions should be at the same tem- perature. 2 mL of ISA is added to each 100 mL of sample and standard.
  • Page 16 XIV XIV XIV XIV XIV ..Other Measurement T Other Measurement T Other Measurement T echniques echniques Other Measurement T Other Measurement T echniques echniques echniques Known addition An unknown concentration of ammonia can be determined by adding a known amount (volume and concentration) of ammonia standard to a known volume of the sample.
  • Page 17 7) The procedure can be repeated with a second standard addition to verify slope and operation of the method. Note: This method is preprogrammed in the Hanna HI 4222pH/ISE/mV meter, which simplifies the method greatly and permits repeated determinations easily. Example: Ammonia determination with known addition: 1.
  • Page 18 XV. XV. XV. XV. XV. Storage and Care of the HI 4101 sensor Storage and Care of the HI 4101 sensor Storage and Care of the HI 4101 sensor Storage and Care of the HI 4101 sensor Storage and Care of the HI 4101 sensor The HI 4101 sensor can be stored assembled and ready to use in HI 4001-45 Conditioning solution overnight or between measurements.
  • Page 19 XVII. XVII. HI 4101 A HI 4101 A ccessories and Replacement P ccessories and Replacement P arts arts XVII. XVII. HI 4101 A XVII. HI 4101 A HI 4101 A ccessories and Replacement P ccessories and Replacement P ccessories and Replacement P arts arts arts For Calibration...

  • Page 20: Warranty

    Damage due to accidents, misuse, misapplication, tampering or lack of prescribed maintenance is not covered. Hanna Instruments reserves the right to modify the design, construction or appearance of its products without advance notice.