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GT00YY00ZV
GT00YY00ZV

GAOTek Water Quality Meter with Advance 12 Multiparameter (Reset)

ID: GT00YY00ZV
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Overview

GAOTek Water Quality Meter with Advance 12 Multiparameter (Reset) is designed to measure the Conductivity, ORP, pH, TDS, Salinity, and Resistivity of the liquids and reset all parameters to default settings automatically. It offers built in real time clock that stamps stored data and complies with GLP standard. This high-performance water meter is equipped with a huge backlit LCD screen. It has relative and absolute millivolts measurement modes that provide precise ORP readings. The device’s auto-hold function freezes stable measured value for easy recording and viewing.

Key Features 

  • Automatic Temperature Compensation provides accurate reading over the entire range
  • Calibration Due Reminder prompts user to calibrate the meter regularly
  • Stability indicator automatically shows current measurement status
  • Auto-Hold function freezes stable measured value for easy viewing and recording
  • Manual temperature calibration corrects temperature deviation
  • Selectable temperature unit (°C or °F) meets different application requirements
  • Automatic electrode diagnosis shows zero point offset and slope of the electrode
  • Help message as an operational guide that helps you quickly begin using the meter
  • System menu allows setting the 12 parameters, including the number of calibration points, resolution, stability condition, measurement unit, etc.
  • Reset feature automatically resumes all parameters back to factory default settings
  • Expanded memory stores and recalls up to 500 readings
  • Built-in real-time clock stamps stored data to meet GLP standard
  • Stored data can be transferred to computer by USB communication interface

Technical Specifications

pH
Range -2.000 pH ~20.000 pH
Accuracy ± 0.002 pH
Resolution 0.1 pH, 0.01 pH, 0.001 pH, Selectable
Calibration Points 1 to 5 points
Calibration Solutions USA, NIST, DIN, User-Defined
Temperature Compensation 32 °F ~ 212 °F (0 °C ~ 100 °C), Manual or Automatic
mV
Range -1999.9 mV ~ 1999.9 mV
Accuracy ± 0.2 mV
Resolution 0.1 mV, 1 mV
Calibration Points 1 point (Only for Relative mV mode)
Calibration Range ± 200 mV
Conductivity
Range 0 ~ 20.00, 200.0, 2000 µS/cm, 20.00, 200.0 mS/cm
Accuracy ± 0.5 % F.S
Calibration Points 1 to 5 points
Calibration Solutions 10 µS/cm, 84 µS/cm,1413 µS/cm,12.88 mS/cm,111.8 mS/cm
Temperature Compensation 32 °F ~ 212 °F (0 °C ~ 100 °C), Manual or Automatic
Temperature Coefficient 0.0 ~ 10.0 %/°C
Compensation Modes Linear or Pure Water
Cell Constant K = 0.1, 1, 10
Normalization Temperature 68 °F or 77 °F (20 °C or 25 °C)
TDS
Range 0~100 ppt (Max. 200 ppt, depending on factor setting)
Accuracy ± 1 % F.S
TDS Factor 0.1 ~ 1.0 (Default 0.5)
Salinity
Range 0~10 ppt (Max. 80 ppt)
Accuracy ± 1 % F.S
Measurement Modes Seawater or Practical Salinity
Resistivity
Range 0 MΩ ~ 100 MΩ
Accuracy ± 1 % F.S
Resolution 0.01, 0.1, 1
Temperature
Range 32 °F ~ 221 °F (0 °C ~ 105 °C)
Accuracy ± 0.9 °F (± 0.5 °C)
Resolution 32.18 °F (0.1 °C)
Calibration Points 1 point, Measured value ± 50 °F (± 10 °C)
Others
Hold Function Manual or Automatic
Stability Conditions Low or High
Calibration Due 0 to 31 days
Power Off Manual or Automatic (10, 20, 30 minutes)
Reset Function Yes
Memory Stores up to 500 data sets
Output USB Communication Interface
Connector BNC
Display LCD
Power Requirements DC 5 V, using AC adapters, 220 V AC/50 Hz
Dimensions (L × W × H) 8.26 in × 7.40 in × 2.36 in (210 mm × 188 mm × 60 mm)
Weight 3.30 lbs (1.5 kg)

Additional Information

ACCESSORIES:

  • pH Electrode
  • Conductivity Electrode
  • Temperature Probe
  • pH Buffer Pouches (pH 4.01/7.00/10.01)
  • Conductivity Calibration Solutions (84µS/cm, 1413µS/cm, 12.88mS/cm)
  • USB Cable
  • DC5V Power Adapter

Display

This device is equipped with a clear and bright LCD display that shows measured values, mode indicators and help messages.

Keypad

The meter has a succinct membrane keypad, names and symbols describe each function key controls.

  1. Power the meter ON/OFF.
  2. Freezes the measured value on the display, press the key again to resume measuring.
  3. In the calibration or temperature setting mode, exits current mode and returns to measurement.

  1. Toggles between available measurement modes (pH, mV, ORP, Conductivity, TDS, Salinity, Resistivity).
  2. Press and hold the key to enter temperature setting mode.

  1. Press the key to enter the calibration mode.
  2. Press and hold the key to enter the setup menu.

  1. Press the key to store current measured value.
  2. Press ▲ key in setup mode to scroll up through the menu.
  3. Press ▲ key in temperature setting mode to increase the setting values.

  1. Press the key to view calibration report or stored data.
  2. Press ▼ key in setup mode to scroll down through the menu.
  3. Press ▼ key in temperature setting mode to decrease the setting values.

  1. Confirms the calibration, setting value or displayed option.
  2. Press and hold the key to turn the backlight On/Off.

Connectors

This water quality meter provides 5 connectors for connecting the various types of sensors.

CONNECTOR FUNCTION
pH/ISE For connecting the pH or ORP Electrodes
ATC For connecting the temperature probe
COND For connecting the conductivity electrode
REF For connecting the reference electrode
USB/ For connecting the USB cable and DC 5 V power adapter

Connecting the Electrode Holder

The meter comes with an easy-to-use holder for mounting a variety of electrodes and temperature probe. If necessary, please follow the steps below to install the electrode holder.

The base of the electrode holder with an irregular round hole.

The electrode arm has a plastic rod.

Insert the plastic rod into the irregular round hole and swivel the electrode arm 90°. Electrode holder is now ready to swing into the desired position.

ADJUSTMENT OF ELECTRODE ARM:

After installation, if the electrode arm automatically rises or falls, you need to adjust the screws until arm locates at any position.

  1. Remove the plastic cover from the electrode arm.
  2. Use the screwdriver to tighten the screw moderately.
  3. Insert the plastic cover to the previous position. Installation is completed.

Connecting the Sensor

Take out the applicable sensors from the packaging. Follow the steps below to place the electrode into left or right sides of the electrode arm.

 

FOR THE pH OR ORP SELECTIVE ELECTRODES:

Insert the BNC connector into the corresponding connector socket. Rotate and push the connector clockwise until it locks. After the connection is completed, DO NOT pull on the sensor cord. Always make sure that the connector is clean and dry.

FOR THE CONDUCTIVITY ELECTRODE:

Insert the 6-pin connector into corresponding connector socket, ensure the connector is fully seated.

Preparing the pH Buffer Solutions

This device is packaged with three pH buffer packets required for calibration.

  1. Open the pH 7.00 buffer packet, place the powder into 250 ml volumetric flask. Pour distilled water 250 ml to scale line, mix the solution until reagent is completely dissolved.
  2. Preparation of pH 4.01 and 10.01 standard buffer solutions are the same as above.
  3. Prepared standard buffer solutions should be stored in hermetically sealed glass containers.

Prior to Use

Remove the protective cap from the bottom of the sensor.

  1. FOR THE pH ELECTRODE:

    If the glass sensitive membrane on the electrode dries out, soak the electrode in 3 M KCl solution or tap water for at least 15 minutes. DO NOT use distilled or deionized water, it will shorten the life of the sensor.

  2. FOR THE ORP ELECTRODE:
    Soak the electrode in 3 M KCl solution or tap water for 5 minutes.
  3. 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

  1. Press MEAS key to turn on the meter, the display shows measured values, mode indicators and help messages.
  2. Press and hold the MEAS key for 3 seconds, the meter will turn off.
  3. If you do not press any key within the specified time period, the meter will turn off automatically.

Setup Menu

This 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

PARAMETER DESCRIPTION OPTIONS DESCRIPTION DEFAULT
bUF pH Buffers:
Select your desired pH buffer group for calibration and auto-recognition.
 USA USA (1.68, 4.01, 7.00, 10.01, 12.45)
 nIST NIST (1.68, 4.01, 6.96, 9.18, 12.45)
 dIN DIN (1.09, 4.65, 6.79, 9.23, 12.75)
 USEr User-Defined Buffer
 CAL Calibration Points:
Select the number of calibration points you intend to calibrate the meter.
 1 1 point
 2 2 points
 3 3 points
 4 4 points
 5 5 points
 rESO Resolution:
Sets the resolution for pH measurement.
 0.001 0.001 pH
 0.01 0.01 pH
 0.1 0.1 pH
 UNIT Measurement Unit:
Sets the default temperature unit.
 °C Degrees Celsius
 °F Degrees Fahrenheit

ORP MODE:

PARAMETER DESCRIPTION OPTIONS DESCRIPTION DEFAULT
rESO Resolution:
Sets the resolution for ORP measurement.
      0.1 0.1 mV
         1 1 mV

CONDUCTIVITY/TDS MODES:

PARAMETER DESCRIPTION OPTIONS DESCRIPTION DEFAULT
 CELL Cell Constant: Select the cell constant of conductivity electrode. 0.1 K=0.1
1 K=1
10 K=10
USEr User-defined
 COE Temperature Coefficient: Select the temperature coefficient of the sample. 2.10 Setting Range: 0.0 to 10.0 %/ °C 2.10
CAL Calibration Points: Select the number of calibration points. 1 1 point
2 2 points
3 3 points
4 4 points
5 5 points
 PUrE Pure Water Coefficient: Pure water coefficient will be calculated and applied automatically for ultra-pure water measurement if enabled. YES Enable
NO Disable
 Std Normalization Temperature: Sets the normalization temperature for conductivity measurement and calibration. 25 °C 25 °C
20 °C 20 °C
 tdS TDS Factor: Sets the default TDS conversion factor. 0.5 Setting Range: 0.40 to 1.00 0.5
 UNIT Measurement Unit: Sets the default temperature unit. °C Degrees Celsius
°F Degrees Fahrenheit

GENERAL OPTIONS:

PARAMETER DESCRIPTION OPTIONS DESCRIPTION DEFAULT
 STA Stable Criteria:

Sets the stability criteria for measurement.

When the “LO” option is enabled, measuring value will stabilize quickly, but reading is less accurate. When the “HI” option is enabled, measuring value will stabilize slowly, but guarantees high accuracy.

      LO Low
      HI High
HOLD Auto-Hold:

When the auto-hold function is enabled, the meter will automatically sense a stable end-point reading and freeze it.

    YES Enable
      NO Disable
 OFF Auto-Power Off:

When the auto-off power is enabled, if you do not press any key within a specified time period, the meter will automatically turn off.

       10 10 minutes
      20 20 minutes
      30 30 minutes
      NO Disable
CALL Calibration Due:

When calibration due reminder is enabled, if you do not recalibrate meter within a specified time period, the meter will automatically show  indicator.

1….31 1 to 31 days
    OFF Disable
dAtE Date and Time:

Sets the date and time of the meter.

 CLr Clear stored data:

Clear all stored data.

    YES Enable
      NO Disable
 rSt Reset:

Reset function allows the user to restore the meter back to factory default parameters. When this function is enabled, all calibration values and selected parameters will be lost or reset.

    YES Enable
      NO Disable

Temperature Compensation

In order to get accurate measuring results, you need to enable the manual or automatic temperature compensation before measurement or calibration.

AUTOMATIC TEMPERATURE COMPENSATION:

  1. Place the temperature probe into the circular hole of electrode arm.
  2. Insert the connector of the temperature probe into corresponding connector socket (Marked “ATC”).
  3. The “ATC” indicator will be shown on the display; the meter is now switched to automatic temperature compensation mode.

MANUAL TEMPERATURE COMPENSATION:

  1. DO NOT connect the temperature probe to meter.
  2. Press and hold the °C key for 3 seconds to enter temperature setting mode.
  3. Press ▲ or ▼ key to set the temperature value of the sample.
  4. Press ENTER key to confirm, the meter returns to measurement mode. The setting is completed.

pH Calibration

This device allows up to 5 points calibration in the pH mode. It is recommended that you perform at least 2 points calibration for high accuracy measurement. The meter will automatically recognize and calibrate to following standard buffer values.

USA Standard Buffer Options pH 1.68, 4.01, 7.00, 10.01, 12.45
NIST Standard Buffer Options pH 1.68, 4.01, 6.86, 9.18, 12.45
DIN Standard Buffer Options pH 1.09, 4.65, 6.79, 9.23, 12.75

If you selected the user-defined option in the setup menu, the meter will allow only 2 points calibration. Single point calibration should only be carried out with pH 7.00, 6.86 or 6.79, otherwise, calibration will not be accepted.

Make sure to calibrate the meter when attaching a new electrode or during first use. DO NOT reuse calibration solution after calibration, contaminants in solution will affect the calibration and eventually the accuracy of the measurement.

SINGLE POINT CALIBRATION:

  1. Make sure that you have selected 1 point calibration in the setup menu.
  2. Rinse the pH electrode with distilled water.
  3. Press CAL key, the meter shows “pH7.00/CAL” (or “6.86/CAL”, “6.79/CAL”).
  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 homogeneous solution.
  5. Press ENTER key, “Calibration” indicator begins flashing. Wait for the measured value to stabilize, the display shows “END”. The meter returns to measurement mode automatically. Calibration is completed.

MULTI-POINT CALIBRATION:

  1. Make sure that you have selected 2 to 5 points calibration in the setup menu.
  2. Repeat above steps. When the first calibration point is completed, the display will show “CAL2”. The meter prompts you to continue with second point calibration.
  3. Rinse the pH electrode with distilled water. Dip the electrode into the next standard buffer solution (e.g., pH4.01). The meter automatically senses the current calibration solution and begins calibrating. “Calibration” indicator begins flashing.
  4. Wait for the measured value to stabilize, the display shows “CAL3”. The meter prompts you to continue with third point calibration.
  5. Repeat the steps until the display shows “END”. The meter returns to measurement mode automatically. Calibration is completed.

pH CALIBRATION WITH THE USER-DEFINED BUFFERS:

  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.
  2. Rinse the pH electrode with distilled water. Dip the electrode into the custom buffer solution. Stir the sensor gently. The meter shows the current measured value.
  3. Press ▲ or  ▼ key to increase or decrease the displayed value, press ENTER key to confirm. “Calibration” indicator begins flashing.
  4. Wait for the measured value to stabilize, the display shows “CAL2”. The meter prompts you to continue with second point calibration.
  5. Rinse the pH electrode with distilled water. Dip the electrode into the next custom buffer solution.
  6. Press ▲ or ▼ key to increase or decrease the displayed value, press ENTER key to confirm. “Calibration” indicator begins flashing.
  7. Wait for the measured value to stabilize, the display shows “END”. The meter automatically returns to measurement mode. Calibration is completed.

ORP Calibration

This water quality meter allows 1 point calibration in the relative mV mode, but calibration is not necessary unless exact readout agreement with a work standard and at a specific ORP value is needed.

  1. Press MODE key until the meter shows  indicator.
  2. Rinse the ORP electrode with distilled water. Dip the electrode into the calibration solution. Stir the sensor gently.
  3. Press CAL key, the meter shows the current measured value.
  4. Press ▲ or ▼ key to set the displayed value, press ENTER key to confirm. “Calibration” indicator begins flashing.
  5. Wait for the measured value to stabilize, the display shows “END”. The meter returns measurement mode automatically. Calibration is completed.

Conductivity Calibration

This device 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. The table below shows available sensors and its effective measuring ranges.

CONDUCTIVITY ELECTRODE MEASURING RANGES CELL CONSTANT
CON-0.1 0.1 µS/cm~100 µS/cm K = 0.1
CON-1 0.01 mS/cm ~10 mS/cm K = 1
CON-10 0.1 mS/cm ~200 mS/cm K = 10

Make sure that you selected the cell constant between 0.1, 1 or 10 in the setup menu. If the current option is “USER”, the automatic calibration function will be disabled.

In the automatic calibration mode, the meter allows up to 5 points calibration. To ensure higher accuracy, it is recommended that you perform 3 points calibration or select a standard value close to the sample value you are measuring. The meter will automatically detect these conductivity standard solutions and prompt the user to calibrate the meter. When the calibration is completed, all new calibration values will automatically override existing data.

The following table shows acceptable conductivity range of calibration solution for each measuring range.

MEASURING RANGE CALIBRATION SOLUTION RANGE DEFAULT
0 µS/cm ~20 µS/cm 7 µS/cm ~17 µS/cm 10 µS/cm
20 µS/cm ~200 µS/cm 70 µS/cm ~170 µS/cm 84 µS/cm
200 µS/cm ~2000 µS/cm 700 µS/cm ~1700 µS/cm 1413 µS/cm
2 mS/cm ~20 mS/cm 7 mS/cm ~17 mS/cm 12.88 mS/cm
20 mS/cm ~200 mS/cm 70 mS/cm ~170 mS/cm 111.8 mS/cm

SINGLE POINT CALIBRATION:

  1. Press MODE key until the meter shows  indicator.
  2. Rinse the conductivity electrode with distilled water, then rinse with a small amount of calibration solution.
  3. Press CAL key, the meter enters the calibration mode.
  4. Dip the conductivity electrode into the calibration solution, the meter automatically shows current calibration standard (e.g., 1413 µS/cm).
  5. Press ENTER key to confirm, “Calibration” indicator begins flashing.
  6. Wait for the measured value to stabilize, the display shows “END”. The meter returns to measurement mode automatically. Calibration is completed.

MULTI-POINT CALIBRATION:

  1. Make sure that you have selected 2 to 5 points calibration in the setup menu.
  2. Repeat steps 2 to above, when the first calibration point is completed, the display will show “CAL2”. The meter prompts you to continue with second point calibration.
  3. Rinse the conductivity electrode with distilled water. Dip the electrode into the next calibration solution, the meter automatically shows current calibration standard (e.g., 12.88 mS/cm).
  4. Press ENTER key to confirm, “Calibration” indicator begins flashing.
  5. Wait for the measured value to stabilize, the display shows “CAL3”. The meter prompts you to continue with third point calibration.
  6. Repeat steps 3 to 4 above until the display shows “END”. The meter returns to measurement mode automatically. Calibration is completed.

MANUAL CALIBRATION:

This meter provides a quick manual calibration mode that allows the user to easily calibrate the meter.

  1. Record the cell constant value on the electrode (e.g., K = 1.08).
  2. Press and hold the  key for 3 seconds to enter setup menu, the display shows “CELL” option
  3. Press ENTER key to confirm, the meter enters the cell constant setting mode.
  4. Press ▲ or ▼  key to select “USER” option.
  5. Press ENTER key to confirm, the meter enters User-Defined mode.
  6. Press ▲ or ▼  key to set each digit according to the previous record.
  7. Press ENTER key to confirm until the setting values stop flashing. The meter returns to measurement mode automatically. The setting is completed.

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.
  2. Press ▲ or ▼  key to set the temperature value.
  3. Press ENTER key to confirm. Calibration is completed.

pH Mode:

  1. The device is equipped with a large backlit LCD display.
  2. 1 to 5 points push-button calibration with auto-buffer recognition.
  3. Selectable pH buffer standard (USA/NIST/DIN) or using the custom calibration solutions.
  4. Automatic electrode slope display helps the user decide whether to replace the sensor.

ORP Mode:

  1. Single point offset calibration allows adjusting the displayed value to a known standard.
  2. Relative and absolute millivolts measurement modes provide accurate ORP readings.

Conductivity/TDS/Salinity/Resistivity Mode:

  1. 1 to 5 points push-button calibration with automatic calibration solution recognition.
  2. Selectable cell constant (0.1/1/10), normalization temperature (68 °F/77 °F, 20 °C/25 °C), TDS conversion factor, seawater and practical salinity measurement modes.
  3. Linear or pure water compensation improves the measurement accuracy of the meter.

pH Measurement

  1. Press MODE key until the meter showsindicator.
  2. Rinse the pH electrode with distilled water to remove any impurities adhering to the probe body.
  3. 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.

ORP Measurement

This instrument contains two millivolt measurement modes.

ABSOLUTE MILLIVOLT MODE:

Press MODE key until the display shows indicator, the meter enters relative millivolt measurement mode.

RELATIVE MILLIVOLT MODE:

Press MODE key until the display shows  indicator, the meter enters relative millivolt measurement mode.

Select one of the above modes. Dip the ORP electrode into the sample solution, stir the sensor gently. Wait for reading to stabilize, record the measured value on the display

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, stir the sensor gently.
  4. Wait for the reading to stabilize, record the measured value on the display.

Salinity Measurement

This meter provides two salinity measurement modes: practical salinity (unit: PSU) and natural seawater (unit: ppt).

  1. Press MODE key until display shows indicator and measurement unit “PSU”, the meter now enters practical salinity measurement mode.
  2. If necessary, press MODE key again, the meter shows indicator and measurement unit “ppt”, the meter now enters seawater measurement mode.
  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” indicator appears on the display. If the Auto-Hold function is disabled, press   key, the meter will immediately freeze currently displayed value.

Press the key again to resume measuring.

Storing and Recalling Data from Memory

This water quality meter allows up to 500 data sets to be stored and recalled.

Communication 

This instrument comes with a free Data Acquisition System that can be used to transfer stored data, receive the measuring values or set the interval time for automatic recording. The system requirement is Windows XP or Windows 7.

RECEIVING DATA:

  1. Connect the USB cable to meter and computer. Click the DAS icon, the system will automatically scan an available communication port and show the message box “ Found a port on your computer”.
  2. Click the OK button, the application starts.
  3. Click the Connect button, the screen shows “Port is connected” indicate that communication between the meter and the computer has been established.
  4. Click the OK button to confirm.
  5. Click the Receive button, the stored data in the meter will automatically send to the computer.

INTERVAL RECORDING:

This function helps you to record the measuring value within the specified time period.

  1. Click the Interval Recording button and select a time option.
  2. Click the Receive button, the measured value will automatically send to the data sheet.

GRAPH MODE:

This function helps you to view variations of the measured parameter continuously. Click the Graph button, the screen will immediately show curve graph. If you want to quit current mode, click the Back button.

CREATE THE EXCEL FILE:

When the transfer is completed, click the “Save as Excel” button, the measured values in the data sheet will automatically convert to Excel file.

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, store the electrode in the electrode storage solution.

CLEANING THE ELECTRODE:

  1. Salt deposits: Soak the electrode in warm tap water to dissolve deposits, then thoroughly rinse with distilled water.
  2. Oil or Grease film: Wash the electrode bulb gently in some detergents and water. If necessary, using the alcohol to clean the electrode bulb, then rinse with distilled water. Place the sensor in the electrode storage solution for 30 minutes.
  3. Clogged reference junction: Heat a diluted KCl solution to 140 °F to 176 °F (60 °C to 80 °C). Place the sensing part of the electrode into the heated solution for about 10 minutes. Allow the electrode to cool in some unheated KCl solution.
  4. Protein deposits: Prepare a 1% pepsin solution in 0.1 M of HCl. Place the electrode in the solution for 10 minutes. Rinse the sensor with distilled water

REACTIVATING THE ELECTRODE:

If stored and cleaned properly, the electrode should be ready for immediate use. However, a dehydrated bulb may cause the sluggish response. To rehydrate the bulb, immerse the electrode in a pH 4.01 buffer solution for 10 to 30 minutes. If this fails, the electrode requires activation.

  1. Soak the pH electrode in 0.1 M HCl for 5 minutes.
  2. Remove and rinse with deionized water, then place in 0.1 M NaOH for 5 minutes.
  3. Remove and rinse again, and soak in electrode storage solution for 30 minutes.

ORP Electrode Care and Maintenance

  1. Ensure that the ORP electrode is thoroughly washed with distilled water after each use.
  2. In aggressive chemicals, dirty or viscous solutions, and solutions with heavy metals or proteins take readings quickly and rinse electrode immediately after.
  3. If you do not use the electrode for long periods, please store the electrode with electrode storage solution.

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: 

  1. Soak the ORP electrode in 0.1 M HCl for 10 minutes
  2. Remove and rinse with distilled water, then place in alcohol for 5 minutes.
  3. Remove and rinse again, and soak in pH4.01 buffer solution for 15 minutes


Oil and Grease Films:

  1. Wash the electrode gently in some detergents and water.
  2. Dip the electrode in the electrode storage solution for at least 30 minutes.

Conductivity Electrode Care and Maintenance

  1. Ensure that the conductivity electrode is thoroughly washed with distilled water after each use.
  2. If there is a build-up of solids inside the measurement area of the cell, these should be removed very carefully with a cotton bud soaked in solvent, taking care not to touch the metal parts of the inner cell.

Troubleshooting

LCD DISPLAY CAUSE CORRECTIVE ACTION
Electrode dried out Soak the pH electrode in 3M KCL solution for 15 minutes
Soak the conductivity electrode in tap water for a few minutes
Measured value is out of range Check the electrode whether clogged, dirty or broken
Err Incorrect calibration solutions Using the fresh calibration solutions for calibration
Setting value does not match calibration solution Reset the calibration value
pH electrode is out of service life Replace the pH electrode

Optional pH Electrodes

The instrument is equipped with a general purpose pH electrode, if it cannot fully meet your measurement requirements, please refer to the table below to select an applicable sensor.

SAMPLE TYPE P11 P12 P13 P14 P16 P17 P18 P19
Agar
Beer
Blood Products
Bread, Dough
Cement
Cosmetics
Dairy Products
Education
Fats/Cream
Field Use
Fish Products
Lab Flasks
Low Ionic
Meat, Cheese
Micro Samples
Paint
Photographic
Soil
Surface
Test Tubes
Tris Buffer
Viscose

How to prepare the electrode storage solution

Dissolve 22.365 grams of potassium chloride reagent (KCL) in the 100 mL distilled water, stir the solution until the solution has thoroughly mixed.

How to prepare the conductivity standard solutions

Place AR potassium chloride reagent in a 50 mL beaker and dry in an oven for 3 to 5 hours at 221 °F (105 °C), then cool to room temperature in desiccator.

CALIBRATION SOLUTIONS REAGENT
84 µS/cm Accurately weigh out 42.35 mg of KCL and dissolve in 1000 mL de-ionised water
1413 µS/cm Accurately weigh out 745.9 mg of KCL and dissolve in 1000 mL de-ionised water
12.88 mS/cm Accurately weigh out 7.45 g of KCL and dissolve in 1000 mL de-ionised water
111.8 mS/cm Accurately weigh out 74.5 g of KC, and dissolve in 1000 mL de-ionised water

Stir the solution until the reagent has thoroughly mixed. Preparation is completed.

How to calculate the temperature coefficient

To determine the temperature coefficient of sample solution use this formula:

  1. Press and hold the °C key for 3 seconds to enter temperature setting mode.
  2. Press ▲ or ▼ key to set the temperature at 77 °F (25 °C).
  3. Dip the electrode into sample solution A.
  4. Record the temperature value TA and conductivity value CTA.
  5. Repeat the steps above, dip the electrode into same sample solution B. Make sure both sample solutions have about 41 °F (5 °C) to 50 °F (10 °C) difference.
  6. Record the temperature value TB and conductivity value CTB.
  7. Calculate the temperature coefficient of sample solution according to the formula shown above.
  8. Enter the calculated temperature coefficient into the meter.

How to calculate the TDS conversion factor

To determine the TDS conversion factor use the following formula:

 

For example: Dissolve 64 g of potassium chloride reagent in 1L distilled water. If its conductivity value is 100mS/cm, then TDS conversion factor is 0.64.

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