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Hach MP-4 User Manual

Mp series portable meters
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DOC022.53.80072
MP Series Portable Meters
USER MANUAL
October 2009, Edition 1
© Hach Company, 2009. All rights reserved. Printed in the U.S.A.
hh/dk

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  • Page 1 DOC022.53.80072 MP Series Portable Meters USER MANUAL October 2009, Edition 1 © Hach Company, 2009. All rights reserved. Printed in the U.S.A. hh/dk...

  • Page 3: Table Of Contents

    3.3 Keypad description ................... 16 3.4 Take a measurement ................17 3.5 Measure conductivity ................17 3.6 Measure resistivity (MP-4 and MP-6 models) ........... 17 3.7 Measure mineral/salt (MP-6p model only) ..........18 3.8 Measure TDS .................... 18 3.9 Measure ORP/Redox (MP-6 and MP-6p models) ........18 3.10 Measure pH (MP-6 and MP-6p models) ..........
  • Page 4 Table of contents 4.1 Calibration intervals ...................31 4.2 Calibration limits ..................31 4.3 Calibration records ..................31 4.4 Calibrate the meter ..................31 4.5 Exit calibration mode .................32 4.6 Calibrate conductivity, mineral/salt or TDS ..........32 4.7 Calibrate resistivity ..................33 4.8 Reset factory calibration—conductivity, mineral/salt or TDS .....33 4.9 pH calibration .....................33 4.10 Set multiple point pH calibrations ............34 4.11 ORP calibration ..................35...
  • Page 5 Table of contents Appendix D Additional information on pH and ORP (MP-6 and MP-6p models) ..................55 D.1 pH ......................55 D.1.1 pH as an indicator ................55 D.1.2 pH units ..................55 D.1.3 pH sensor ..................55 D.1.4 Sources of error ................56 D.1.5 Temperature compensation ............
  • Page 6 Table of contents...

  • Page 7: Section 1 Specifications

    Section 1 Specifications Specifications are subject to change without notice. General Display 4-digit LCD Dimensions (L x W x H) 196 x 68 x 64 mm (7.7 x 2.7 x 2.5 in.) Weight 352 g (12.4 oz) ®1 Case material VALOX COND/RES/TDS cell material VALOX...
  • Page 8 Specifications Resolution ±0.01 pH ±1 mV 0.01 (<100 µ 0.1 (<1000 µ Conductivity 1.0 (<10 mS) 0.01 (<100 mS) 0.1 (<200 mS) 0.01 (<100 ppm) 0.1 (<1000 ppm) 1.0 (<10 ppt) 0.01 (<100 ppt) 0.1 (<200 ppt) 0.01 (<100 ppm) 0.1 (<1000 ppm) Mineral/Salt 1.0 (<10 ppt)
  • Page 9 Specifications COND/TDS ratios pre-programmed Conductivity KCl, NaCl, 442™ Mineral/salt Adjustable COND/TDS ratio factor Conductivity 0.20 to 7.99 Mineral/salt Trademark of SABIC Innovative Plastics IP BV ± 0.2 pH in presence of RF fields 3 V/m and >300 MHz. Trademark of Myron L Company...
  • Page 10 Specifications...

  • Page 11: Section 2 General Information

    Section 2 General information n no event will the manufacturer be liable for direct, indirect, special, incidental or consequential damages resulting from any defect or omission in this manual. The manufacturer reserves the right to make changes in this manual and the products it describes at any time, without notice or obligation.

  • Page 12: General Product Information

    General information 2.2 General product information The MP-4, MP-6 and MP-6p (see Figure 2 on page 14) handheld meters allow users to test water for pH, ORP, conductivity, resistivity, TDS (Total Dissolved Solids), mineral/salt concentration and temperature. 2.2.1 Overview The MP Series portable meters measure various parameters in water. Data can be stored and (with the optional MP-Dock) transferred to a printer, PC, or USB storage device.

  • Page 13: Conductivity And Ph/Orp Sensor Cups

    General information 2.3 Conductivity and pH/ORP sensor cups Figure 1 Model MP-6 conductivity and pH/ORP sensor cups 1 Temperature sensor 5 pH glass electrode 2 Conductivity cup (built-in 6 Reference junction under glass pH electrodes) bulb 3 ORP electrode 7 pH/ORP sensor protective cap 4 pH/ORP sensor cup (replaceable sensor)
  • Page 14 General information Figure 2 Model MP-6 1 Conductivity cup 4 Display 2 pH/ORP sensor cup 5 Keypad 3 pH/ORP sensor protective cap 6 Wrist strap slot (customer supplied)

  • Page 15: Section 3 Operation

    Section 3 Operation 3.1 System startup There is no ON key or OFF key. Press any measurement key to power on the meter. After 15 seconds of inactivity, the meter turns off (60 seconds in CAL mode). Users can adjust the automatic shut off time up to 75 seconds (see section 3.19 on page 26).

  • Page 16: Keypad Description

    Operation 3.3 Keypad description The MP-6 meter is used as an example for keypad description and function. Figure 4 Keypads on MP Series meters...

  • Page 17: Take A Measurement

    [----] indicates an over range condition. Note: Carefully fill conductivity cup to ensure that the air bubbles do not cling to the cell wall. 3.6 Measure resistivity (MP-4 and MP-6 models) Resistivity is measured in low conductivity solutions. In the conductivity cup, the value can drift due to trace contaminants or absorption from atmospheric gasses.

  • Page 18: Measure Mineral/Salt (Mp-6P Model Only)

    Operation Hold the meter at a 30 degree angle and let the sample flow into the conductivity cup continuously with no aeration. Push the RES key. Observe or record the value displayed. Note: If reading is lower than 10 kΩ, [- - - -] is shown. Measure conductivity for these samples. 3.7 Measure mineral/salt (MP-6p model only) To measure mineral/salt: Rinse the conductivity cup three times with the sample to be measured.

  • Page 19: Select A Solution

    Operation Push the pH key. Observe or record the value displayed, or push UP/MS to store the reading. Important Note: After the test, fill the pH/ORP sensor cup with pH Storage Solution and replace the protective cap. Do not allow the pH/ORP sensor cup to dry out. 3.11 Select a solution Conductivity, resistivity and TDS (including mineral/salt) require temperature compensation to 25 °C.

  • Page 20: Change The User-Selected Temperature Compensation Factor

    Operation 3.12 Change the user-selected temperature compensation factor Select the User mode to change the temperature compensation factor. This feature does not apply to pH or ORP. For user mode information, (see section 2.2.3 on page 12). Select the User mode (see section 3.11 on page 19).

  • Page 21: Settings

    Operation ppm value by the value. For example, a solution of known 75 ppm TDS and µ measured conductivity at 25ºC has a conversion ratio of 75/100 or 0.75. µ To enter a new conversion ratio: Push the TDS key. Select the User mode (see section 3.11 on page 19).

  • Page 22: View The Memory Recall

    Operation 3.14.2 View the memory recall To view the records in memory: Push any measurement key. Push the MR/DOWN key. The MEMORY icon appears, and shows the last record stored. Push UP/MS or MR/DOWN to scroll to the location desired. Note: The temperature display alternates between temperature recorded and location number.

  • Page 23: Set The Date

    Operation Push the CAL/MCLR key to begin. The CAL icon shows the time. Push UP/MS or MR/DOWN to change the time. Push the CAL/MCLR key to accept the new time. 3.15.2 Set the date To change the date format, refer to section 3.15.3 on page 24.

  • Page 24: Set The Date Format

    Operation Push UP/MS or MR/DOWN to change the day. Push CAL/MCLR to accept the new setting for the day. 3.15.3 Set the date format To set the date format: Push any measurement key. Push the MR/DOWN key repeatedly until US or Int displays. To quickly scroll through all stored memory records, hold down the MR/DOWN key.

  • Page 25: Return To Factory Settings

    Operation Push the CAL/MCLR key to switch units. Push any measurement key to accept the unit preference for all temperature readings. Note: Temperature compensation is always displayed in %/ º 3.17 Return to factory settings To set all calibrations to factory settings or to erase all records, follow the steps below.

  • Page 26: Auto Off

    Operation 3.19 Auto off Auto off turns the meter off when there is no activity for a period of time after a key is pushed. The default time is 15 seconds, and 60 seconds in the CAL (calibration) mode. This time may be adjusted up to 75 seconds. Push any measurement key.

  • Page 27: User Mode Calibration Linc Tm Function

    Operation Push UP/MS or MR/DOWN to change the time. The maximum time is 75 seconds. Push the CAL/MCLR key to accept the new auto shut off time. 3.20 User mode calibration Linc function The Linc function allows for calibration when the meter is in the User mode and the user does not have a user standard solution to calibrate the meter.

  • Page 28: Cancel User Mode Calibration Linc

    Operation Push the MR/DOWN key until Linc displays. Push the CAL/MCLR key. SEL displays with the User icon. Note: Any additional display of KCl, NaCl or 442 icons indicates a Linc between the additional solution and the User solution. If none of the solution selection icons are displayed, nothing is linked to the User mode.

  • Page 29: Download Stored Data

    The MP Datalink software, which is included with the MP-Dock, operates on Windows 2000 and XP, and Macintosh OS9.2 and OSX-based operating systems. For the latest instructions on communication port selection and data download, refer to the Hach Company MP-Dock User Manual. Figure 6 MP meter—bottom view 1 Infrared data port...
  • Page 30 Operation...

  • Page 31: Section 4 Calibration

    Section 4 Calibration 4.1 Calibration intervals The MP Series meters are designed to not require frequent calibration. Calibration is recommended about once per month with conductivity or TDS solutions. Check the calibration with pH solution twice per month. Some applications may require calibration frequencies to differ from these suggested guidelines.

  • Page 32: Exit Calibration Mode

    Calibration Parameter KCl, NaCl or 442 User COND Gain only Temperature compensation, then Gain Done in conductivity Done in conductivity or TDS Temperature compensation, Ratio, Gain only then Gain Temperature compensation, Ratio, MIN/SALT Gain only then Gain 7, acid, and/or base Zero set with pH 7 automatically Push the CAL/MCLR key to accept the new calibration value.

  • Page 33: Calibrate Resistivity

    Calibration 4.7 Calibrate resistivity Resistivity is the reciprocal of conductivity. Resistivity is automatically calibrated based on the solution type used during a conductivity calibration. 4.8 Reset factory calibration—conductivity, mineral/salt or TDS If calibration is suspect or known to be incorrect, and no standard solution is available, it is possible to replace the calibrated value with the original factory value for that solution.

  • Page 34: Set Multiple Point Ph Calibrations

    Calibration Push the CAL/MCLR key to enter calibration mode. The CAL, BUFFER and 7 icons appear. The value displayed is for the uncalibrated sensor. Note: If a wrong buffer is added (outside of pH 6-8), 7 and BUFFER will flash and the meter does not adjust.

  • Page 35: Orp Calibration

    Calibration key to exit. If the user exits, the gain value accepted for the buffer is used for both acid and base measurements. Rinse the sensor cup three times with the third buffer solution. Fill the sensor cups again with the same solution. Push UP/MS or MR/DOWN until the display agrees with the buffer value.
  • Page 36 Calibration...

  • Page 37: Section 5 Maintenance

    Practice the following care and maintenance of the MP series handheld meters: Rinse with clean water after each use • Always fill the pH/ORP sensor cup with Hach pH storage solution and replace • the protective cap when not in use.

  • Page 38: Maintain The Conductivity Cup

    5.2.2 Maintain the pH/ORP sensor cup Keep the pH/ORP sensor cup hydrated with Hach pH Storage Solution. Before replacing the pH/ORP sensor cap, rinse and fill the sensor cup with the storage solution. Never use distilled water to store the sensor cup.

  • Page 39: Clean The Ph/Orp Sensor

    Maintenance Figure 7 Model MP-6 sensor cups 1 Temperature sensor 5 pH glass electrode 2 Conductivity cell (built-in electrodes) 6 Reference junction under glass pH bulb 3 ORP electrode 7 pH/ORP sensor protective cap 4 pH/ORP sensor (replaceable) 5.4.2 Clean the pH/ORP sensor The pH/ORP sensor in the MP series meters is non-refillable and features a porous liquid junction.
  • Page 40 Pour any of these solutions in the cell cup and allow it to soak for no more than five minutes. Use a cotton swab to gently clean the electrodes. Rinse out the cleaning solution. Fill the sensor cup with Hach pH storage solution before the pH/ORP sensor cap is replaced. 5.4.2.2 Solutions that damage the pH/ORP sensor Samples that contain chlorine, sulfur or ammonia can damage the pH electrode.

  • Page 41: Section 6 Troubleshooting

    Section 6 Troubleshooting Symptom Possible cause Action No display even though Check the connections or Battery is weak or not measurement key is replace the battery (see connected. pushed section 5.2 on page 37). pH calibration is needed Recalibrate the meter. (see section 4.9 on page Cross-contamination from...
  • Page 42 Troubleshooting...

  • Page 43: Section 7 Contact Information

    HACH Company World Repair Service in the Repair Service in Headquarters United States: Canada: P.O. Box 389 HACH Company Hach Sales & Service Loveland, Colorado Ames Service Canada Ltd. 80539-0389 U.S.A. 100 Dayton Avenue 1313 Border Street, Unit 34 Tel (800) 227-HACH...
  • Page 44 Contact Information HACH LANGE S.L.U. HACH LANGE LDA HACH LANGE SP.ZO.O. Edif. Arteaga Centrum Av. do Forte nº8 ul. Opolska 143 a C/Larrauri, 1C- 2ª Pl. Fracção M PL-52-013 Wroc³aw E-48160 Derio/Vizcaya P-2790-072 Carnaxide Tel. +48 (0)71 342 10-83 Tel. +34 94 657 33 88 Tel.

  • Page 45: Section 8 Replacement Parts And Accessories

    Section 8 Replacement parts and accessories 8.1 Replacement parts Description Item No. pH/ORP sensor HMPSENS 9V alkaline battery 00024Q 8.2 Accessories Description Item No. MP-Dock (facilitates data download to PC or spreadsheet) HMPDOCK 8.3 Consumables Description Quantity Item No. Buffer solution, pH 4.01 50 mL 2283426 Buffer solution, pH 4.01...

  • Page 46: Recommended Cleaning Consumables

    Replacement parts and accessories 8.3 Consumables (continued) Description Quantity Item No. 442-30 Natural Water™ TDS Standard Solution, 30 500 mL 2974549 442-30 Natural Water TDS Standard Solution, 30 ppm 50 mL 2974526 442-300 Natural Water TDS Standard Solution, 500 mL 2974649 300 ppm 442-300 Natural Water TDS Standard Solution,...

  • Page 47: Section 9 Limited Warranty

    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...
  • Page 48 Limited Warranty...

  • Page 49: Appendix A Temperature Compensation

    Appendix A Temperature compensation Electrical conductivity indicates solution concentration and ionization of the dissolved material. Because temperature greatly affects ionization, conductivity measurements are temperature dependent, and are normally corrected to read what they would be at 25 ºC. A.1 Compensation to 25 ºC The MP series handheld meters includes temperature compensation to 25 ºC.

  • Page 50: Graph Of Comparative Error

    Temperature compensation A.3 Graph of comparative error In the range of 1000 µS, the error of using a KCl temperature compensation on a solution that should be calculated as NaCl or 442 is shown in the chart below (Figure Figure 9 To measure natural water-based solutions to 1%, users must alter the internal temperature compensation to the more suitable, pre-loaded 442 values or stay close to 25 ºC.

  • Page 51: Appendix B Conductivity Conversion

    Appendix B Conductivity conversion B.1 How conductivity conversion works When the effect of temperature is removed, the corrected conductivity depends on the concentration (TDS). Temperature compensation of the conductivity of a solution is performed automatically by the meter’s internal processor with data derived from chemical tables.
  • Page 52 Conductivity conversion...

  • Page 53: Appendix C Temperature Compensation And Tds Derivation

    Appendix C Temperature compensation and TDS derivation The MP series handheld meters contain internal algorithms for characteristics of the three most commonly referenced compounds. The selected solution type is shown on the left of the display. In addition to KCl, NaCl and 442, a User choice is available.

  • Page 54: Tds Ratio Of Unknown Solutions

    Temperature compensation and TDS derivation Set the temperature compensation to an expected value (see section 3.12 on page 20). See if the compensated value is the same as the 25 ºC value. If the value is not the same, raise or lower the temperature compensation and measure again until the 25 ºC value is read.

  • Page 55: Appendix D Additional Information On Ph And Orp (Mp

    Appendix D Additional information on pH and ORP (MP-6 and MP-6p models) D.1 pH D.1.1 pH as an indicator pH measures the acidity or alkalinity of an aqueous solution. Another way to describe pH is as the hydrogen ion activity of a solution. pH measures the effective, not the total acidity of a solution.

  • Page 56: D.1.4 Sources Of Error

    Additional information on pH and ORP (MP-6 and MP-6p models) Figure 10 pH/ORP sensor construction 1 Glass surface 5 KCl solution ions 6 Glass 3 Junction plug 7 Electrode wires 4 Platinum button D.1.4 Sources of error D.1.4.1 Reference junction The most common sensor problem is a clogged junction because a sensor is allowed to dry out.

  • Page 57: D.1.5 Temperature Compensation

    Additional information on pH and ORP (MP-6 and MP-6p models) D.1.5 Temperature compensation pH sensor glass changes sensitivity slightly with temperature. When the solution is further from pH 7, this effect increases. For example, a pH of 11 at 40 ºC is off by 0.2 units.
  • Page 58 Additional information on pH and ORP (MP-6 and MP-6p models)
  • Page 59 ....51 conductivity conversion ......21 memory settings conductivity cup ........29 MP-Dock ......38 clean the cup .......45 consumables ....... 57 as an indicator ........29 data port ....57 Hach ORP sensor ......25 default settings ..... 57 sources of error...
  • Page 60 Index ........57 units solutions that damage the pH/ORP .........40 ......50 sensor other solutions .........7 ....12 specifications overview of the meters ...21 store a value in the memory .....17 take a measurement ....... 55 as an indicator ........55 ..54 sensor TDS ratio of unknown solutions...

This manual is also suitable for:

Mp-6Mp-6p

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