Hanna Instruments PL 100 Instruction Manual
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Hanna Instruments PL 100 Instruction Manual

Hanna Instruments PL 100 Instruction Manual

Amperometric chlorine titrators
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PL 100 / PL 101
PL 100 / PL 101
PL 100 / PL 101
PL 100 / PL 101
PL 100 / PL 101
Amperometric
Chlorine Titrators
Instruction Manual

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  • Page 1 PL 100 / PL 101 PL 100 / PL 101 PL 100 / PL 101 PL 100 / PL 101 PL 100 / PL 101 Amperometric Chlorine Titrators Instruction Manual...
  • Page 2 Dear Customer, Thank you for choosing a Hanna Product. This instruction manual has been written for the following products: PL 100 Free Chlorine Titrator PL 101 Total Chlorine Titrator Both the instruments have features such as recorder outputs, 12VDC power supply for safety and reduction of EMI and built-in stirrer.

  • Page 3: Table Of Contents

    TABLE OF CONTENTS PRELIMINARY EXAMINATION ....4 GENERAL DESCRIPTION ....5 FUNCTIONAL DESCRIPTION .

  • Page 4: Preliminary Examination

    Note Because of the inherent dangers in handling chemical samples, standards and reagents, HANNA Instruments strongly recommends the user of this product to review the Material Safety Data Sheets and become familiar with safe handling procedures and proper usage prior to handling any chemicals.

  • Page 5: General Description

    The Hanna PL 100 and PL 101 Chlorine Analyzers are amperometric titrators which allow the determination of the chlorine content in a known quantity of sample . The PL 100 measures Free Chlorine and the PL 101 Total Chlorine. The Hanna PL 100 and PL 101 Amperometric Titrators are...

  • Page 6: Functional Description

    FUNCTIONAL DESCRIPTION FRONT PANEL 1. UP key 2. DOWN key 3. Power LED 4. Stirrer ON/OFF switch 5. LCD Display REAR PANEL 6. ON/OFF switch 7. Fuse holder 8. 12 VDC socket (for HI710005 or HI 710006) 9. BNC Electrode socket 10.
  • Page 7 FRONT PANEL Display The digital redout indicates the probe current in microamps. An overcurrent situation (greater than 1.99 µA) results in a “1.” display (no tenths or hundredths digit). To reduce probe current, merely reduce probe voltage by pressing the front panel “...
  • Page 8 Recorder output The recommended recorder hookup uses a shielded, twisted- pair cable. The shield should be connected to (earth) ground at the recorder end and left open at the instrument end. The output is 0.00 to 2.00 V corresponding to 0.00 to 2.00 µA probe current as indicated on the front panel display.

  • Page 9: Specifications

    SPECIFICATIONS PL 100 PL 101 Range 0 - 750mVDC probe voltage 0.00 - 2.00µA probe current Resolution 0.01 µA Accuracy ±0.01 µA Probe HI 3132B glass-body platinum electrode with 1 m (3.3”) cable Recorder output 0.00 to 2.00V corresponding to 0.00 to 2.00 µA Typical EMC ±1% f.s.

  • Page 10: Method Of Analysis

    METHOD OF ANALYSIS Amperometric titration involves measuring the electrical cur- rent flow between two electrodes, usually platinum, immersed in a known quantity of a sample solution which contains an unknown concentration of the chemical to be measured. The titration of the chlorine with the reducing compound Phenylarsine Oxide (PAO) is an application of this technique.

  • Page 11: Back Titration

    ductant concentration and the activity ratio of the reductant to the measured substance. BACK TITRATION For waters which contain potential chemical interferences or low concentration of Total Chlorine, a back-titration is rec- ommended. In the back-titration procedure, a known excess amount of PAO is added to the sample at pH 4 with an excess of iodide.
  • Page 12 corded after each addition (for best results at least 3 points before and 3 points after the End Point). The End Point is determined by the intersection of the two best lines through the points. The titrant volume is multiplied by a factor to ob- tain the sample chlorine concentration or can be read (only in case of forward titration) straight from the graph if the PL 100/PL 101 graph-paper is used.

  • Page 13: How To Select The Correct Amperometric Titration Procedure

    Do not perform measurements using the forward titration method when chlorine concentration is under 0.05 mg/L. Use back titration for low concentrations of Total chlorine. DRINKING AND WASTEWATER FREE CHLORINE TOTAL CHLORINE (PL 100 only) (PL 101 only) FORWARD TITRATION FORWARD TITRATION BACK TITRATION Low range...

  • Page 14: How To Collect The Sample

    HOW TO COLLECT THE SAMPLE Free chlorine is a strong oxidizing agent and in natural wa- ters reacts with various inorganic and organic compounds, its decomposition being influenced by parameters like reac- tant concentrations, pH, temperature, salinity and sunlight. Combined chlorine (chloroamines) is more stable and per- sistent in the environment.

  • Page 15: Operational Guide

    5. Turn on the speed controlled stirrer and place the beaker on the top of the PL 100. 6. Immerse the probe tip into the sample, make sure the platinum electrodes are submerged.

  • Page 16: Method B: Total Chlorine Forward Titration

    Record at least 3 points before and 3 points after the End Point. 9. Construct a titration graph using the PL 100 graph paper. 10.Draw the best-fit line through each set of points.
  • Page 17 6. Immerse the probe tip into the sample, make sure the platinum electrodes are submerged. 7. Adjust the potentiometric setting, us- ing the “ ” and “ ” keys on the front panel until the display reads about 1.00. 8. Dispense the titrant into the beaker in small increments.

  • Page 18: Method C: Total Chlorine Back Titration

    Method C: Total Chlorine back titration (PL 101 only) Instrument setting 1. Fill the bottle of the automatic burette with 0.00188N I solution (HI 70469) and fill the 10 ml automatic burette to the zero mark. 2. Place the stirbar into a clean 250 mL beaker and add about 200 mL deionized water.
  • Page 19 13.Immerse the probe tip into the sample and make sure the platinum electrodes are submerged. 14. Dispense 5 mL of titrant into the bea- ker. 15.Continue dispensing titrant into the beaker in small increments. Record the display reading that corresponds exactly to the mL of titrant added.
  • Page 20 Note: If the sample is pretreated at the sampling site with the PAO and the acetate buffer as described before, transfer the sample quantitatively to the beaker and add one spoon of potassium iodide from the bottle (HI 70468) 22. Turn on the speed controlled stirrer and place the beaker on the top of the PL 101.

  • Page 21: Interferences And Sources Of Error

    (+4 to +7) can be reduced by PAO in free chlorine titration or manganese (+4 or +7) can oxidize iodide to iodine during the total chlorine titration. Hanna Instruments researchers found that nitrite interference can cause either a positive or negative interference depend- ing on the order of reagent addition.
  • Page 22 Iodine demand of certain samples can cause a shift of the end point as shown in the following graph: The iodine, formed in case of forward total chlorine determi- nation or added as titrant during the backward titration, can be absorbed by suspended particles or can react with or- ganic matter.

  • Page 23: Maintenance

    1. Add a few drops of bleach to tap water in a 250 mL beaker and place the stir bar in the beaker. 2. Place the beaker on the PL 100/PL 101, turn on the instrument and the stir motor.

  • Page 24: Accessories

    Acetate buffer HI 70468 Potassium iodide HI 70469 Iodine standard solution HI 70470 PAO Standard solution 0.00564N (for PL 100 only) HI 70471 PAO Standard solution 0.000564N HI 70472 Phosphate buffer HI 710005 115 VAC to 12 VDC power adapter...

  • Page 25: Warranty

    If the repair is not covered by the warranty, you will be notified of the charges incurred. If the instrument is to be returned to Hanna Instruments, first obtain a Returned Goods Authorization number from the Customer Service de- partment and then send it with shipping costs prepaid.

  • Page 26: Other Products From Hanna

    OTHER PRODUCTS FROM HANNA • CALIBRATION AND MAINTENANCE SOLUTIONS • CHEMICAL TEST KITS • CHLORINE METERS • CONDUCTIVITY/TDS METERS • DISSOLVED OXYGEN METERS • HYGROMETERS • ION SPECIFIC METERS (Colorimeters) • MAGNETIC STIRRERS • Na/NaCl METERS • pH/ORP/Na ELECTRODES • pH METERS •...

  • Page 27: Ce Declaration Of Conformity

    CE DECLARATION OF CONFORMITY Recommendations for Users Before using these products, make sure that they are entirely suitable for the environment in which they are used. Operation of these instruments in residential areas could cause unacceptable interference to radio and TV equipment.

  • Page 28: Hanna Literature

    HANNA LITERATURE Lab Recording Water Analysis Handbook Envirocare General Catalog These and many others catalogs, handbooks and leaf- lets are available from Hanna. To receive your free copy, contact your dealer or the nearest Hanna Cus- tomer Service Center. h t t p : / / w w w . h a n n a i n s t . c o m...

This manual is also suitable for:

Pl 101

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