Hach POCKET COLORIMETER II Instruction Manual
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Hach POCKET COLORIMETER II Instruction Manual

Free ammonia/monochloramine
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28838-88
POCKET COLORIMETER™ II
ANALYSIS SYSTEMS
INSTRUCTION MANUAL
Free Ammonia
Monochloramine
© Hach Company, 2006. All rights reserved. Printed in the U.S.A.
te/dk 9/06 2ed

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  • Page 1 28838-88 POCKET COLORIMETER™ II ANALYSIS SYSTEMS INSTRUCTION MANUAL Free Ammonia Monochloramine © Hach Company, 2006. All rights reserved. Printed in the U.S.A. te/dk 9/06 2ed...
  • Page 2 Important Note This manual is intended for use with the following Pocket Colorimeter™ II instrument: Free Ammonia/Monochloramine Cat. No. 59530-26 1—2...

  • Page 3: Table Of Contents

    Table of Contents Instrument Keys and Display ................1—5 Instrument Cap Cord ................... 1—6 Nitrogen, Free Ammonia and Chloramine (Mono) ........1—9 Measuring Hints ....................1—9 Interferences...................... 1—18 Color Development Time ................. 1—20 Accuracy Check (Monochloramine Test) ............1—21 Accuracy Check (Free Ammonia Test) ............1—24 Method Performance..................
  • Page 4 Table of Contents, continued Error Codes ......................2—9 Error Messages ....................2—9 Standard Calibration Adjust ................2—13 User-Entered Calibration ..................2—15 Overview ......................2—15 Calibration Procedure Using Prepared Standards.........2—17 Entering a Predetermined Calibration Curve..........2—20 Editing a User-entered or Factory Calibration Curve........2—22 Exiting the Calibration Routine ..............2—24 Deleting Calibration Points................2—24 Retrieving the Factory Calibration ..............2—25 Maximum/Minimum Displayed Value ............2—26...

  • Page 5: Instrument Keys And Display

    Instrument Keys and Display Item Description POWER/BACKLIGHT ZERO/SCROLL MENU Numeric Display Range Indicator Range Indicator Menu Indicator Calibration Adjusted Indicator Battery Low Indicator READ/ENTER 1—5...

  • Page 6: Instrument Cap Cord

    Instrument Cap Cord The instrument cap for the Pocket Colorimeter™ II doubles as a light shield. Accurate measurements cannot be obtained unless the sample or blank is covered with the cap. Use the instrument cap cord to secure the cap to the body of the colorimeter and prevent loss of the cap.
  • Page 7 Instrument Cap Cord, continued Figure 1 Attaching the Instrument Cap Cord 1—7...
  • Page 8 1—8...

  • Page 9: Nitrogen, Free Ammonia And Chloramine (Mono)

    Nitrogen, Free Ammonia and Chloramine (Mono) (0.04–4.50 mg/L Cl and 0.02–0.50 mg/L NH –N) Method 10200 Indophenol Method* Scope and Application: For finished chloraminated drinking water Measuring Hints • Collect samples in clean glass bottles. Results are most reliable from samples analyzed as soon as possible after collection.
  • Page 10 Nitrogen, Free Ammonia and Chloramine (Mono), continued Press the key to Fill two cells with 10 mL Place the cell for POWER turn the meter on. of sample. Monochloramine measurement into the cell Label one cell “Free The arrow should indicate holder.
  • Page 11 Nitrogen, Free Ammonia and Chloramine (Mono), continued Cover the cell with the Press Add the contents of one ZERO/SCROLL instrument cap. pillow of Monochlor F to The display will show the cell for Monochloramine “- - - -” then “0.00”. measurement.
  • Page 12 Nitrogen, Free Ammonia and Chloramine (Mono), continued Cap the cell and shake Add one drop of Free Cap the reagent bottle to for 20 seconds to dissolve Ammonia Reagent Solution maintain reagent the reagent. to the cell for Free Ammonia performance and stability.
  • Page 13 Nitrogen, Free Ammonia and Chloramine (Mono), continued HRS MIN SEC HRS MIN SEC Cap the cell and mix. Wait five minutes. Place the prepared Monochloramine sample If the sample becomes Color development Note: Note: into the cell holder. cloudy by the end of the time is dependent on sample reaction period, pretreat the temperature.
  • Page 14 Nitrogen, Free Ammonia and Chloramine (Mono), continued Cover the cell with the Press Change the channel. READ/ENTER instrument cap. The arrow will indicate the The results are displayed in free ammonia channel mg/L Monochloramine –N). (as Cl Leave the cell in the meter. 1—14...
  • Page 15 Nitrogen, Free Ammonia and Chloramine (Mono), continued WIth the Add the contents of Cap and shake for 20 Monochloramine sample one pillow of Monochlor F seconds to dissolve the still in the cell holder, press to the cell for Free Ammonia reagent.
  • Page 16 Nitrogen, Free Ammonia and Chloramine (Mono), continued HRS MIN SEC HRS MIN SEC Wait 5 minutes. Place the prepared Free Cover the cell with the Ammonia sample into the instrument cover. Color development Note: cell holder. depends on sample temperature. See Table 1 on page 1—20 for correct times.
  • Page 17 Nitrogen, Free Ammonia and Chloramine (Mono), continued Press Return the meter to the READ/ENTER chlorine channel for the The results are displayed in next measurement. mg/L free ammonia as nitrogen (NH –N) 1—17...

  • Page 18: Interferences

    Nitrogen, Free Ammonia and Chloramine (Mono), continued Interferences The following do not interfere in free ammonia determination when at or below the stated concentration. Substance Level Tested Aluminum 0.2 mg/L Al Chloride 1200 mg/L Cl Copper 1 mg/L Cu Iron 0.3 mg/L Fe Manganese 0.05 mg/L Mn...
  • Page 19 Nitrogen, Free Ammonia and Chloramine (Mono), continued Substance Level Tested Zinc 5 ppm Zn Samples containing high levels of both Total Hardness and Alkalinity may become cloudy after the addition of the Free Ammonia Reagent Solution. If this occurs by the end of the first reaction period, the sample for Free Ammonia measurement must be pretreated as follows: Note:...

  • Page 20: Color Development Time

    Nitrogen, Free Ammonia and Chloramine (Mono), continued Color Development Time Test results are strongly influenced by sample temperature. Both reaction periods in the procedure are the same and depend on the temperature of the sample. The reaction periods indicated in the procedure are for a sample temperature of 18-20 °C (64-68 °F).

  • Page 21: Accuracy Check (Monochloramine Test)

    Standard solutions for monochloramine are difficult and time-consuming to prepare. Errors can occur if attention to detail is not addressed during preparation of the standards. Hach Company prepares the calibration curve under rigorous analytical laboratory conditions. Hach recommends using the factory calibration.
  • Page 22 Nitrogen, Free Ammonia and Chloramine (Mono), continued A user calibration or a user-prepared monochloramine standard may be required by a regulatory official or agency. Two options are available on the Pocket Colorimeter™ II to meet this requirement. A monochloramine standard may be prepared and used to validate the calibration curve using the Standard Calibration Adjust feature (see page 2—13 for more...
  • Page 23 Nitrogen, Free Ammonia and Chloramine (Mono), continued 5. Pipet 50.00 mL of the buffered ammonia standard into a clean 100-mL beaker with a stir bar. 6. Obtain a recent lot of Chlorine Solution Ampules, 50–75 mg/L, and note the actual Free Chlorine concentration for this lot. 7.

  • Page 24: Accuracy Check (Free Ammonia Test)

    Nitrogen, Free Ammonia and Chloramine (Mono), continued Accuracy Check (Free Ammonia Test) Dilution water is required when testing a diluted sample and preparing standard solutions. Dilution water must be free of ammonia, chlorine and chlorine demand. A convenient source is a recirculating, deionizer system with carbon filtration which produces 18 megaohm-cm water.

  • Page 25: Method Performance

    In a single laboratory using a solution containing 1.59 ppm Monochloramine as chlorine plus 0.14 ppm free NH -N and one representative lot of reagent with the Pocket Colorimeter II, a single operator obtained a standard deviation of ± 0.005 mg/L NH -N for nine replicates.

  • Page 26: Summary Of Method

    Nitrogen, Free Ammonia and Chloramine (Mono), continued Summary of Method Monochloramine (NH Cl) and “free ammonia” (NH and NH ) can exist in the same water sample. Added hypochlorite combines with free ammonia to form more monochloramine. In the presence of a cyanoferrate catalyst, monochloramine in the sample reacts with a substituted phenol to form an intermediate monoimine compound.

  • Page 27: Replacement Parts

    Nitrogen, Free Ammonia and Chloramine (Mono), continued Replacement Parts Required Reagents Quantity Required Description Per Test Unit Cat. No. Free Ammonia Reagent Set (50 tests) Includes: (1) 28022-99, (1) 28773-36............28797-00 Free Ammonia Reagent Solution....1 drop ....4 mL SCDB ..28773-36 Monochlor F Reagent Pillows ....
  • Page 28 Nitrogen, Free Ammonia and Chloramine (Mono), continued Description Unit Cat. No. Nitrogen Ammonia Standard Ampule, 50 mg/L as NH –N, 10 mL............16/pkg ..14791-10 Nitrogen Ammonia Standard Solution, 100 mg/L as NH –N..............500 mL ..24065-49 Water, Organic Free............... 500 mL ..26415-49 Optional Apparatus Ampule Breaker Kit ................each ..
  • Page 29 Nitrogen, Free Ammonia and Chloramine (Mono), continued Description Unit Cat. No. Stir Bar, Octagonal................each ..20953-52 Stirrer, Magnetic ................. each ..28812-00 Thermometer, –10 to 110 °C............... each ..1877-01 Wipers, Disposable Kimwipes®, 30 x 30 cm, 280/box ....box ..20970-01 1—29...
  • Page 30 1—30...
  • Page 31 Section 2 Instrument Manual 2—1...
  • Page 32 2—2...

  • Page 33: Instrument Operation

    Instrument Operation Key Functions Description Function On/Off/Backlight POWER To turn on the backlight, turn on the instrument, then press and hold the power key until the backlight turns on. Press and hold again to turn off the backlight. This key functions the same in all instrument modes and ranges.

  • Page 34: Menu Selections

    Instrument Operation, continued Description Function Enter/Exit the menu mode MENU Press and hold for approximately 5 seconds to enter user-entered method mode. Menu Selections Press the key to access the menu selections. MENU Switching Ranges 1. Press the key. The display will show “SEL”. A flashing arrow indicates MENU the current range.

  • Page 35: Recalling Stored Measurements

    Instrument Operation, continued 2. Press . The digit to be edited will flash. READ/ENTER 3. Use the key to change the entry, then press ZERO/SCROLL READ/ENTER accept and advance to the next digit. The time is entered in 24-hour format. Recalling Stored Measurements 1.

  • Page 36: Battery Installation

    Instrument Operation, continued Battery Installation Figure 1 on page 2—7 provides an exploded view of battery installation. 1. Unhook the latch and remove the battery compartment cover. The polarities are shown on the battery holder. 2. Place the four batteries provided with the instrument in the holder as indicated and replace the battery compartment cover.
  • Page 37 Instrument Operation, continued Figure 1 Battery Installation 2—7...
  • Page 38 2—8...

  • Page 39: Error Codes

    Error Codes When the instrument cannot perform the function initiated by the operator, an error message will appear in the display. Refer to the appropriate message information below to determine what the problem is and how it can be corrected. Resolve error messages in the order that they appear on the display.
  • Page 40 Error Codes, continued 3. E-2 LED Error The LED (light source) is out of regulation. • Replace batteries. • Verify LED lights up (inside the cell holder) when the READ/ENTER key is pressed. ZERO/SCROLL • If the problem persists, contact a Service Center (page 2—37).
  • Page 41 Error Codes, continued • If the problem persists, contact a Service Center (page 2—37). 5. E-6 Abs Error (User mode) Indicates that the absorbance value is invalid, or indicates an attempt to make a curve with less than two points. •...
  • Page 42 Error Codes, continued 8. Underrange—flashing number below stated test range • Verify instrument cap is correctly seated. • Check zero by measuring a blank. If error recurs, re-zero the instrument. • If the problem persists, contact a Service Center (page 2—37).

  • Page 43: Standard Calibration Adjust

    Standard Calibration Adjust The Pocket Colorimeter™ II instrument is factory-calibrated and ready for use without user calibration. Use of the factory calibration is recommended unless the user is required to generate a calibration. The Standard Calibration Adjust can be used to meet regulatory requirements. This feature allows the factory default calibration curve to be adjusted with a known standard.
  • Page 44 Standard Calibration Adjust, continued 7. Press to access the Edit function, then press ZERO/SCROLL READ/ENTER begin editing. The digit to be edited will flash. Use the key to ZERO/SCROLL change the entry, then press to accept and advance to the READ/ENTER next digit.

  • Page 45: User-Entered Calibration

    User-Entered Calibration Overview The Pocket Colorimeter™ II will accept a user-prepared calibration curve. The curve can extend from 0 to 2.5 absorbance. A user-prepared calibration curve may be entered into any channel that does not contain a factory-programmed curve. These channels are labeled “abs”...
  • Page 46 User-Entered Calibration, continued • CAL—Used to enter and edit standard values and measure absorbance values, or review the existing calibration. • Edit—Used to enter and edit standard values and absorbance values with the keypad or review the existing calibration. Used to enter a predetermined calibration curve.

  • Page 47: Calibration Procedure Using Prepared Standards

    User-Entered Calibration, continued • Once in the CAL or Edit option, press the key to navigate through READ/ENTER each option. Note: Press to quickly scroll through each option. ZERO/SCROLL Calibration Procedure Using Prepared Standards Note: Deionized water or a reagent blank can be used to zero during the calibration procedure. Calibrations generated with deionized water as the zero will give less accurate results if the reagent blank is significantly more turbid or colored than deionized water.
  • Page 48 User-Entered Calibration, continued 3. Insert the reagent blank or deionized water into the meter and cover with the cap. Press the key. The meter will display “- - - -”, followed by ZERO/SCROLL “0.000”. This initializes (zeroes) the meter. 4. Press the key and hold it down until the display shows “USER”, followed MENU by “CAL”.
  • Page 49 User-Entered Calibration, continued 9. Insert the reagent blank or deionized water into the cell holder. Cover the blank with the instrument cap. 10. Press the key. The meter will measure and display the absorbance READ/ENTER value for “S0”. 11. Remove the sample blank. Press the key.

  • Page 50: Entering A Predetermined Calibration Curve

    User-Entered Calibration, continued 16. Press the key twice to exit and accept the changes. The instrument will MENU use this calibration to determine the displayed concentration of future sample measurements. Entering a Predetermined Calibration Curve Note: Entering a predetermined calibration curve requires at least two data pairs. Each data pair requires a concentration value and the absorbance value for the given concentration.
  • Page 51 User-Entered Calibration, continued 4. Enter the concentration value and absorbance value of the first data pair (S0, A0). 5. To enter the S0 value, press . Use the key to select READ/ENTER ZERO/SCROLL the numerical value, then press the key to accept the entry and READ/ENTER advance to the next decimal place.

  • Page 52: Editing A User-Entered Or Factory Calibration Curve

    User-Entered Calibration, continued 10. When all the calibration data has been entered, press twice to return to MENU the measurement mode. Editing a User-entered or Factory Calibration Curve 1. Press the key and hold it down until the display shows “USER”, followed MENU by “CAL”.
  • Page 53 User-Entered Calibration, continued 5. To edit the S0 value, press . Use the key to select the READ/ENTER ZERO/SCROLL numerical value, then press the key to accept the entry and READ/ENTER advance to the next decimal place. Repeat this sequence until the S0 concentration value is entered.

  • Page 54: Exiting The Calibration Routine

    User-Entered Calibration, continued Note: When a factory calibration curve has been edited, the “calibration adjust” icon will appear in the display. Exiting the Calibration Routine Exit the calibration routine by pressing the key to return to measurement MENU mode. The instrument uses the last completed user-entered calibration or the factory calibration if no user-entered calibration has been completed.

  • Page 55: Retrieving The Factory Calibration

    User-Entered Calibration, continued 5. Press to delete. Repeat for all points to be deleted. READ/ENTER Note: The minimum number of valid points is two. For example, if five points have been entered, three can be deleted using this feature. 6. Press to return to the measurement mode.

  • Page 56: Maximum/Minimum Displayed Value

    User-Entered Calibration, continued Maximum/Minimum Displayed Value In meters with absorbance (Abs) ranges, the maximum displayed value and minimum displayed value is related to the value of the standards entered in a user calibration. Measurements that exceed the minimum or maximum standards entered in the user calibration will return a flashing number indicating “underrange”...
  • Page 57 Example 2 For a calibration with the following standards: S0=1.00 S1=2.00 S2=4.00 Maximum Displayed Value 4.00 Minimum Displayed Value 1.00 For Hach-calibrated programs, the maximum and minimum displayed values always equal the factory-calibrated values and cannot be changed. 2—27...

  • Page 58: Certification

    Certification Hach Company certifies this instrument was tested thoroughly, inspected, and found to meet its published specifications when it was shipped from the factory. The Pocket Colorimeter™ II instrument has been tested and is certified as indicated to the following instrumentation standards:...
  • Page 59 Interference-causing Equipment Regulations. Cet appareil numérique de la classe A respecte toutes les exigences du Règlement sur le matériel brouilleur du Canada. FCC Part 15, Class “A” Limits: Supporting test records from Hach EMC Test Facility, certified compliance by Hach Company. 2—29...
  • Page 60 Certification, continued This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) This device must accept any interference received, including interference that may cause undesired operation.
  • Page 61 Certification, continued 1. Remove power from the Pocket Colorimeter instrument by removing one of its batteries to verify that it is or is not the source of the interference. 2. Move the Pocket Colorimeter instrument away from the device receiving the interference.
  • Page 62 2—32...
  • Page 63 GENERAL INFORMATION At Hach Company, customer service is an important part of every product we make. With that in mind, we have compiled the following information for your convenience. 2—33...
  • Page 64 2—34...

  • Page 65: How To Order

    (800) 227-HACH (800-227-4224) Loveland, Colorado 80539-0389 U.S.A. By FAX: For order information by E-mail: (970) 669-2932 (Hach Loveland) orders@www.hach.com Information Required: • • Hach account number (if available) Purchase order number • • Billing address Catalog number • • Shipping address Brief description or model number •...
  • Page 66 Call 1-800-227-4224 or E-mail techhelp@hach.com. International Customers Hach maintains a worldwide network of dealers and distributors. To locate the representative nearest you, send E-mail to intl@hach. com or call (970) 669-3050. In Canada Hach Instrument Service Centre, Winnipeg, Manitoba, Canada Telephone: (204) 632-5598;...

  • Page 67: Repair Service

    Repair Service Authorization must be obtained from Hach Company before sending any items for repair. Please contact the Hach Service Center serving your location. In the United States: Canada: Hach Company Hach Sales & Service Canada Ltd. 100 Dayton Avenue...

  • Page 68: Warranty

    In the event that a defect is discovered during the warranty period, Hach Company agrees that, at its option, it will repair or replace the defective product or refund the purchase price, excluding original shipping and handling charges.
  • Page 69 Hach Company • any product not used in accordance with the instructions furnished by Hach Company • freight charges to return merchandise to Hach Company • freight charges on expedited or express shipment of warranted parts or product • travel fees associated with on-site warranty repair...
  • Page 70 On the basis of strict liability or under any other legal theory, in no event shall Hach Company be liable for any incidental or consequential damages of any kind for breach of warranty or negligence.

This manual is also suitable for:

59530-26

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