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Labtron LPWM-A10 Manual

Portable water hardness meter
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Portable water
hardness meter
LPWM-A10
www.labtron.com
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info@labtron.com

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Summary of Contents for Labtron LPWM-A10

  • Page 1 Portable water hardness meter LPWM-A10 www.labtron.com info@labtron.com...
  • Page 2 Index Sr.no Title Page no Introduction Features Specifications Applications Instrument Structure Installation Operations Maintenance Troubleshooting...
  • Page 3 1. Introduction Portable water hardness meter LPWM-A10 comes with LCD display, 2 to 5 points calibration system with low to high concentration range. It can measure salts of calcium, magnesium at mg/L, mmol/ scale. The calibration due reminder alerts user for calibration of the meter on regular basis.

  • Page 4: Specifications

    3. Specifications Water hardness range 0.05 mmol (CaCO ) 0 - 19999 mg / L, (CaO) 0 - 11220 mg / L, (boiler) 0 - 400 mmol / L, (Ca) 0 - 8020 mg / L (German degree) 0 - 1122 °dH, (English degree) 0 - 1404 °e, (French degree) 0 - 2000 °f Accuracy ±...

  • Page 5: Structure Introduction

    5. Structure Introduction Display The portable water hardness meter is equipped with a clear and bright LCD that is used to show measured values, mode indicators, and help messages. The following table describes the meaning of each indicator. Index...
  • Page 6 Keypad The meter has a succinct membrane keypad, and names and symbols describe each function key control. Index...

  • Page 7: Installation

    6. Installation UNPACKING THE METER: Before unpacking, ensure that the current work environment meets the following conditions. ● Relative humidity is less than 80%. ● Ambient temperature is greater than 0°C and less than 60°C. ● No potential electromagnetic interference. The following list describes the standard accessories of the meter.
  • Page 8 7. Operations Connectors A portable water hardness meter provides 3 connectors for connecting the various types of sensors. Listed in the below table are the details of these connectors. Index Connector Function BNC Connector For connecting the pH or ORP electrode Phone Jack For connecting the temperature probe 6-pin Connector...
  • Page 9 Inserting the Batteries Before using the meter, insert three 1.5V “AA” alkaline batteries into the battery compartment, and follow the procedure outlined below. 1. Remove the battery cover from the meter’s backside. 2. Insert the batteries into the battery compartment, and note polarity. 3.
  • Page 10 For the conductivity electrode: ● Insert the 6-pin connector into the corresponding connector socket, ensure the connector is fully seated.
  • Page 11 • After the connection is completed, DO NOT pull on the sensor cord. Always make sure that the connector is clean and dry. Preparing the pH Buffer Solutions The portable water hardness meter is packaged with three pH buffer packets required for calibration.
  • Page 12 For the ORP electrode Soak the electrode in 3KCL solution or tap water for 5 minutes. For the conductivity electrode: Soak the electrode for a few minutes in tap water to remove dirt and oil stains on the electrode. Power On/Off •...
  • Page 13 Setup Menu Benchtop multi-parameter water quality meter contains an integrated setup menu that allows you to customize each displayed option to meet measurement requirements. In the different modes, the meter will show the corresponding options. For the general options, once it is changed that will be applied to all modes. pH Mode...
  • Page 14 Conductivity/TDS/Salinity/Resistivity modes...
  • Page 15 General Options...
  • Page 16 Setting the Default Parameters 1. If necessary, press the MODE key until the display shows the corresponding mode indicator (e.g., pH mode). 2. Press and hold the key for 3 seconds, the meter enters the setup menu, and the display shows selectable parameters and page number.
  • Page 17 3. Press key to scroll through the menu, and select the parameter you want to set (Refer to Setup Menu section) 4. Press the ENTER key to confirm, the display shows an option in the submenu. 5. Press key to select the desired option. 6.
  • Page 18 Exit the setup menu During the setup mode, press the MEAS key, and the meter returns to measurement mode immediately. Setting the Date and Time A portable water hardness meter has a real-time clock that is used to time-stamp stored measured value and calibration data.
  • Page 19 4. Press key to set the year. 5. Press the ENTER key to confirm, the meter shows the current date and time.

  • Page 20: Automatic Temperature Compensation

    6. Press the key to set the date and time. 7. Press the ENTER key to confirm, that the meter returns to measurement mode. The setting is completed. Temperature Compensation To get accurate measuring results, you need to enable manual or automatic temperature compensation before measurement or calibration.
  • Page 21 In the temperature setting mode, press key once, the setting value will increase or decrease by 0.1. Press and hold the  or  key, and the setting value will increase or decrease by 1 pH Calibration Portable water hardness meter allows up to 5 points of calibration in the pH mode. We recommend that you perform at least 2 points of calibration for high-accuracy measurement.
  • Page 22 1.4 Dip the pH electrode into the pH7.00 (or 6.86, or 6.79) buffer solution, the end of the electrode must be completely immersed into the calibration solution. Stir the sensor gently to create a homogenous solution. 1.5 Press the ENTER key, “Calibration” indicator begins flashing. Wait for the measured value to stabilize, the display shows “END”.
  • Page 23 2.4 Wait for the measured value to stabilize, the display shows “CAL3”. The meter prompts you to continue with third-point calibration. 2.5 Repeat steps 2.3 until the display shows “END”. The meter returns to measurement mode automatically. Calibration is completed.
  • Page 24 pH CALIBRATION WITH THE USER-DEFINED BUFFERS 3.1 Make sure that you have selected “USER” option in the setup menu. Custom buffer solution values should be at least 1 pH unit apart from each other. 3.2 Rinse the pH electrode with distilled water. Dip the electrode into the custom buffer solution.
  • Page 25 During the calibration process, if you want to exit the calibration mode, press the MEAS key, and the meter will return to measurement mode immediately. The electrode indicator shows the average slope of the pH electrode after calibration. When the electrode or calibration result does not meet measurement requirements, the indicator will disappear from the display.
  • Page 26 3. Press ENTER key to confirm, the meter shows the last calibration date (Format: mm-dd). 4. Press key, the meter shows “OFS” (zero-point offset potential). 5. Press key again, the meter shows the slope of each pH buffer group.
  • Page 27 6. After browsing, press the MEAS key to exit the correct mode. If you do not calibrate the meter or calibration is not successful, press the MR key, and the display will show "----" only. ORP Calibration A portable water hardness meter allows 1-point calibration in the relative mV mode, but calibration is not necessary unless an exact readout agreement with a work standard and at a specific ORP value is needed.
  • Page 28 2. Rinse the ORP electrode with distilled water. Dip the electrode into the calibration solution. Stir the sensor gently. 3. Press CAL key, and the meter shows the current measured value. 4. Press key to set the displayed value, press ENTER key to confirm. “Calibration” indicator begins flashing.
  • Page 29 ORP Calibration Report This program lets you check the millivolt offset in the ORP mode. 1. Press the MR key in the ORP measurement mode, the display shows “LOC/P-01”. 2. Press key until the meter shows “ELE/P-02” (Electrode Diagnosis) 3. Press ENTER key to confirm, the meter shows the last calibration date (Format: mm-dd)

  • Page 30: Measuring Ranges

    4. Press key, the meter shows “OFS” (Offset Potential). 5. After browsing, press the MEAS key, and the meter returns to measurement mode. Conductivity Calibration Portable water hardness meter is capable of using the three types of conductivity electrodes. Before calibration or measurement, you need to select the different sensors as per your sample concentration.

  • Page 31: Measuring Range

    The following table shows the acceptable conductivity range of calibration solution for each measuring range. MEASURING RANGE CALIBRATION SOLUTION RANGE DEFAULT 0~20µS/cm 7~17µS/cm 10µS/cm 20~200µS/cm 70~170µS/cm 84µS/cm 200~2000µS/cm 700~1700µS/cm 1413µS/cm 2~20mS/cm 7~17mS/cm 12.88mS/cm 20~200mS/cm 70~170mS/cm 111.8mS/cm SINGLE POINT CALIBRATION 1.1 Press the MODE key until the meter shows indicator. 1.2 Rinse the conductivity electrode with distilled water, then rinse with a small amount of calibration solution.
  • Page 32 1.5 Press the ENTER key to confirm, the “Calibration” indicator begins flashing. 1.6 Wait for the measured value to stabilize, the display shows “END”. The meter returns to measurement mode automatically. Calibration is completed.

  • Page 33: Multi-Point Calibration

    MULTI-POINT CALIBRATION: 2.1 Make sure that you have selected 2 to 5 points calibration in setup menu. 2.2 Repeat steps 1.2 to 1.5 above, when the first calibration point is completed, the display will show “CAL2”. The meter prompts you to continue with second point calibration. 2.3 Rinse the conductivity electrode with distilled water.

  • Page 34: Manual Calibration

    2.5 Wait for the measured value to stabilize, the display shows “CAL3”. The meter prompts you to continue with third-point calibration. 2.6 Repeat steps 2.3 to 2.4 above until the display shows “END”. The meter returns to measurement mode automatically. Calibration is completed. MANUAL CALIBRATION: A portable water hardness meter provides a quick manual calibration mode that allows users to easily calibrate the meter.
  • Page 35 3.3 Press ENTER key to confirm, the meter enters the cell constant setting mode. 3.4 Press key to select “USER” option.
  • Page 36 3.5 Press ENTER key to confirm, the meter enters User-Defined mode. 3.6 Press key to set each digit according to the previous record. 3.7 Press the ENTER key to confirm until the setting values stop flashing. The meter returns to measurement mode automatically. The setting is completed. •...
  • Page 37 3. Press the ENTER key to confirm, the meter shows the last calibration date (Format: mm- dd). 4. Press key, and the meter shows the calibration point and calibration factor (e.g., K=0.998). 5. After browsing, press the MEAS key to exit the current mode.

  • Page 38: Temperature Calibration

    Temperature Calibration During the measurement, when automatic temperature compensation is enabled, if the temperature reading displayed differs from that of an accurate thermometer, you need to calibrate the meter. 1. Press and hold the °C key for 3 seconds to enter temperature calibration mode, the display shows current temperature reading.
  • Page 39 ORP Measurement The portable water hardness meter contains two millivolt measurement modes. ABSOLUTE MILLIVOLT MODE: • Press the MODE key until the display shows measurement unit “mV”, the meter now enters absolute millivolt measurement mode. RELATIVE MILLIVOLT MODE: • Press the MODE key until the display shows indicator, and the meter enters relative millivolt measurement mode.
  • Page 40 Conductivity/TDS/Resistivity Measurement 1. Press MODE key until the meter shows (Conductivity) or (TDS) or (Resistivity) indicator. 2. Rinse the conductivity electrode thoroughly with distilled water. 3. Dip the electrode into the sample solution, and stir the sensor gently. 4. Wait for the reading to stabilize, and record the measured value on the display. Salinity Measurement Meer provides two salinity measurement modes: practical salinity (unit: PSU) and natural seawater (unit: ppt).
  • Page 41 3. Select the desired measurement mode. Dip the electrode into the sample solution. Stir the sensor gently. 4. Wait for the reading to stabilize, record the measured value on the display Hold Function The meter contains two data hold modes. When the Auto-Hold function is enabled, the meter will automatically sense a stable endpoint reading and freeze it, “HOLD”...

  • Page 42: Memory Input

    Storing and Recalling Data from Memory A portable water hardness meter meter allows up to 500 data sets to be stored and recalled. MEMORY INPUT: During the measurement process, press the MI key to input the measured value into the memory, “Memory”...
  • Page 43 2. Press ENTER key to confirm, the meter shows page number of the stored data. 3. Press the key, and the meter shows date and time of the stored data (Format: mm-dd, hh-mm).

  • Page 44: Receiving Data

    4. Press  key again, the display shows the stored data. 5. After the browsing, press MEAS key to exit the current mode. Communication A portable water hardness meter provides a free Data Acquisition System that can be used to transfer data, receive the measuring values, or import the data to Excel.

  • Page 45: Interval Recording

    • Click the Receive button, and the stored data in the meter will automatically be sent to the computer. INTERVAL RECORDING: • This function helps you to record the measuring value within the specified period. • Click the Interval Recording button and select a time option. •...

  • Page 46: Maintenance

    8. Maintenance pH Electrode Care and Maintenance Since pH electrode is susceptible to dirt and contamination, clean as necessary depending on the extent and condition of use. AFTER MEASURING: Rinse the pH electrode in distilled water, and store the electrode into the electrode storage solution.
  • Page 47 CLEANING THE ELECTRODE: Contamination of the sensing element often results in slow response and inaccurate readings. If necessary, clean the element by one of the following procedures. Inorganic Deposits: • Soak the ORP electrode in 0.1M HCl for 10 minutes. •...

  • Page 48: Troubleshooting

    9. Troubleshooting LCD DISPLAY CAUSE CORRECTIVE ACTION Electrode dried out Soak the pH electrode in 3M KCL solution for 15 minutes Soak conductivity electrode in tap water for a few minutes Check whether The measured value is out electrode whether of the range clogged, dirty, or broken Incorrect...

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