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PH Meter with ORP-Ion (High Accuracy, 5 Point Calibration)
PH Meter with ORP-Ion (High Accuracy, 5 Point Calibration)

PH Meter with ORP/Ion (High Accuracy, 5 Point Calibration)

USD $899.00

Out of stock

Overview

GAOTek PH Meter with ORP/Ion (High Accuracy, 5 Point Calibration) is designed to measure the pH, ORP and ion concentration of the liquids. It provides the expanded memory storage and recalls up to 500 readings. It supports built-in real time clock to stamps the stored data and complies with GLP standard. This meter has auto hold and reset function. It provides the calibration due reminder to calibrate the meter regularly. The pH Meter equipped with a clear and bright LCD display used to display measured values, mode indicators and help message.

Key Features

  • Clear and bright LCD display used to display measured values, mode indicators and help message.
  • Automatic Temperature Compensation provides accurate reading over the entire range.
  • Calibration Due Reminder prompts user to calibrate the meter regularly.
  • Stability indicator automatically display current measurement status.
  • Auto-Hold function freezes stable measured value for easy viewing and recording.
  • Selectable temperature unit (°C or °F) meets different application requirements.
  • Manual temperature calibration corrects temperature deviation.
  • Automatic electrode diagnosis shows zero point offset and slope of the electrode.
  • System menu allows setting the 10 parameters, including the pH buffer standard, number of calibration points, resolution, stability condition, hold function etc.
  • 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 into computer by USB communication interface
  • Reset feature automatically resumes all parameters back to factory default settings.

Technical Specifications

pH
Range -2.000 pH to 20.000 pH
Accuracy ± 0.002 pH
Resolution 0.1 pH, 0.01 pH, 0.001 pH (Selectable)
Calibration Points 1 to 5 points
Temperature Compensation 32 ˚F ~ 212 ˚F (0 ˚C ~ 100 ˚C)
Compensation Mode Manual or Automatic
Calibration Solutions USA, NIST, DIN or User-defined
mV
Range -1999.9 mV to 1999.9 mV
Accuracy ± 0.2 mV
Resolution 0.1 mV, 1 mV (Selectable)
Calibration Range ± 200 mV
Calibration Points 1 point (only for relative mV mode)
Ion
Range 0.001 ppm ~ 19999 ppm, mg/L, mol/L
Accuracy ± 0.5 % F.S (Monovalent), ± 1 % F.S (Divalent)
Resolution 0.001, 0.01, 0.1, 1
Calibration Solutions 0.001, 0.01, 0.1, 1, 10, 100,1000, 10000 ppm, mg/L, mol/L
Calibration Points 2 to 5 points
Temperature
Range 32 ˚F ~ 221 ˚F (0 ˚C ~ 105 ˚C)
Accuracy ± 0.5 °C, ± 0.9 °F
Resolution 32.18 °F (0.1 °C)
Calibration Points 1 point
Calibration Range ± 10 °C measured value
General Specification
Interface USB communication interface
Connector BNC
Memory Up to 500 sets
Calibration Due 0 to 31 days
HOLD Function Manual or Automatic
Stability Conditions Low or High
Reset Function Yes
Power Requirements DC 5 V, using AC adapter, 220 V AC/ 50 Hz
Dimensions 8.27 in × 7.40 in × 2.36 in (210 mm × 188 mm × 60 mm)
Weight 3.31 lbs. (1.5 kg)

Additional Information

ACCESSORIES:

  • pH Electrode
  • Temperature Probe
  • pH Buffer Pouches (pH 4.01, 7.00, 10.01)
  • USB Cable
  • DC 5 V Power Adapter

Display

PH Meter with ORP/Ion (High Accuracy, 5 Point Calibration) is equipped with a clear and bright LCD display that used to show measured values, mode indicators and help message. The following table describes the meaning of each indicator.

Keypad

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

Connectors

This PH Meter with ORP/Ion (High Accuracy, 5 Point Calibration) provides 4 connectors for connecting the various types of sensors. Listed in the below table are the details of these connectors.

No Connector Function
1 pH/ISE For connecting the pH, ORP or Ion Selective Electrodes
2 ATC For connecting the temperature probe
3 REF For connecting the reference electrode
4 USB/power key For connecting the USB cable and DC5V power adapter

Setup Menu

PH Meter with ORP/Ion (High Accuracy, 5 Point Calibration) 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.

ORP MODE:

Connecting the Electrode Holder

The meter comes with an easy-to-use holder for mounting a variety of sensors 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

The electrode arm has a plastic

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

ADJUSTMENT OF ELECTRODE ARM:

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

  1. Remove the plastic cover from the electrode

  1. Use the screwdriver to tighten the screw moderately.
  2. Insert the plastic cover to previous position. Installation is completed.

Connecting the Electrode

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

Insert the BNC connector into the corresponding connector socket. Rotate and push the connector clockwise until it locks. After 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

This PH Meter with ORP/Ion (High Accuracy, 5 Point Calibration) is packaged with three pH buffer packets required for calibration.

  • Open the pH7.00 buffer packet, place the powder into a 250 ml volumetric flask. Pour distilled water 250 ml to scale line, mix the solution until reagent is completely dissolved.
  • Preparation of pH4.01 and 10.01 standard buffer solutions are the same as above.
  • Prepared standard buffer solutions should be stored in hermetically sealed glass containers.

Prior to Use

Remove the protective cap from the bottom of the electrode.

FOR THE pH ELECTRODE:

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

FOR THE ORP ELECTRODE:

Soak the electrode in 4M KCL solution or tap water for at least 15 minutes.

  • FOR THE ION SELECTIVE ELECTRODES:

Soak the electrode in the diluted standard solution (e.g., 100 ppm) for at least 15 minutes.

Power On/Off

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

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:

  • Place the temperature probe into the circular hole of electrode arm.

  • Insert the connector of temperature probe into corresponding connector socket (Marked “ATC”).

  • 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 ▼ key or ▲ key to set the temperature value of sample.
  4. Press ENTER key to confirm, the meter returns to measurement mode. Setting is completed.

In the temperature setting mode, press or key once, the setting value will increase or decrease by 0.1. Press and hold the or key, the setting value will increase or decrease by 1

pH Calibration

This PH Meter with ORP/Ion (High Accuracy, 5 Point Calibration) 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:

  • Make sure that you have selected 1 point calibration in the setup menu.
  • Rinse the pH electrode with distilled water.
  • Press CAL key, the meter shows “pH7.00/CAL” (or “6.86/CAL”, “6.79/CAL”).

  • 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.
  • 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:

  • Make sure that you have selected 2 to 5 points calibration in the setup menu.
  • Repeat steps  above. When the first calibration point is completed, the display will show “CAL2”. The meter prompts you to continue with second point calibration.

  • 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.

  • Wait for the measured value to stabilize, the display shows “CAL3”. The meter prompts you to continue with third point calibration.
  • Repeat the steps 2.3 until the display shows “END”. The meter returns to measurement mode automatically. Calibration is completed.

pH Calibration Report

This program lets you check the parameters of pH electrode for diagnostic purposes.

  1. Press MR key in the pH measurement mode, the display shows “LOC/P-01”.
  2. Press ▲or▼ key until the meter shows “ELE/P-02” (Electrode Diagnosis).

  1. Press ENTER key to confirm, the meter shows the last calibration date (Format: mm-dd).

   

  1. Press ▼key, the meter shows “OFS” (zero-point offset potential).
  2. Press ▼key again, the meter shows the slope of each pH buffer group.

6.After the browsing, press MEAS key to exit the current mode.

If you did not calibrate the meter or calibration is not successful, press MR key, the display will show “—-” only.

ORP Calibration

PH Meter with ORP/Ion (High Accuracy, 5 Point Calibration) 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.

ORP Calibration Report

This program lets you check the millivolt offset in the ORP mode.

  1. Press MR key in the ORP measurement mode, the display shows “LOC/P-01”.
  2. Press ▲ or ▼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).
  4. Press ▼key, the meter shows “OFS” (Offset Potential).
  5. After the browsing, press MEAS key, the meter returns to measurement mode.

Ion Concentration Calibration

This PH Meter with ORP/Ion (High Accuracy, 5 Point Calibration) supports ion concentration calibration up to 5 points with minimum of 2 points, available calibration points include the following options.

MEASUREMENT UNITS CALIBRATION POINTS
ppm 0.001, 0.01, 0.1, 1, 10, 100, 1000, 10000
mg/L 0.001, 0.01, 0.1, 1, 10, 100, 1000, 10000
mol/L 0.001, 0.01, 0.1, 1, 10
mmol/L 0.001, 0.01, 0.1

To obtain accurate measurement results, it is recommended that you perform ion calibration and measurement at same temperature. If you did not calibrate the meter or calibration is not successful, the display will always show “0.000”.

  1. Press MODE key until the meter shows indicator.

  1. If necessary, select the concentration unit and ion valence (Monovalent or Divalent) in the setup menu (Refer to Setup Menu section).

NOTE: The meter is capable of using the mg/L, ppm or mol/L as measurement unit of concentration. The factory default is ppm. If you had converted concentration unit, the display will show “CAL” and will flash uninterruptedly. When CAL key is pressed the meter enters the calibration mode.

  1. Press CAL key, the meter shows 0.001 ppm (or mg/L, mol/L, mol/L).

  1. If necessary, press ▲or▼ key to select the desired calibration point (e.g., 0.01 ppm).

  1. Rinse the Ion Selective Electrode with distilled water, then rinse with a small amount of ion standard solution.
  2. Dip the electrode into corresponding calibration solution. Stir the sensor gently to create a homogenous solution.
  3. Press ENTER key to confirm, “Calibration” indicator begins flashing. Wait for the measured value to stabilize, the display shows “0.1/CAL2”. The meter prompts you to continue with second point calibration.

  1. Rinse the Ion Selective Electrode with distilled water. Dip the electrode into corresponding calibration solution. Stir the sensor gently.
  2. Press ENTER key, “Calibration” indicator begins flashing. Wait for the measured value to stabilize, the display shows “1/CAL3”. The meter prompts you to continue with third point calibration.

  1. Repeat steps 8 to 9 above until the display shows “END”, the meter returns to measurement mode automatically. Calibration is completed.

EXIT THE CALIBRATION:

During the calibration process, if you want to exit calibration, press MEAS key, the meter will return to measurement mode immediately.

Ion Calibration Report

This program lets you check the slope of the Ion Selective Electrode.

  1. Press MR key in the ion measurement mode, the meter shows “LOC/P-01”.
  2. Press ▼ or ▲ key until the display shows “ELE/P-02” (Electrode Diagnosis).
  3. Press ENTER key to confirm, the meter shows the last calibration date (Format: mm-dd).

4.     Press ▼ key, the meter shows calibration point and its slope.

5.     After the browsing, press MEAS key to exit the current mode.

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 Measurement

  1. Press MODE key until the meter shows  indicator.
  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 PH Meter with ORP/Ion (High Accuracy, 5 Point Calibration) contains two millivolt measurement modes.

ABSOLUTE MILLIVOLT MODE:

Press MODE key until the display shows measurement unit “mV”, the meter enters absolute 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 sample solution, stir the sensor gently. Wait for reading to stabilize, record the measured value on the display.

 Ion Concentration Measurement

  1. Press MODE key until the meter showsindicator
  2. Rinse the Ion Selective Electrode thoroughly with distilled water. Dip the electrode into the sample solution.
  3. If your sample is belong to low concentration liquids or some interfering ions are present in the solution, we suggest you that adding the Ionic Strength Adjuster into the sample solution.
  4. Stir the sensor gently. 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 the key, the meter will immediately freeze currently displayed value. Press the key again to resume measuring.

Storing and Recalling Data from Memory

PH Meter with ORP/Ion (High Accuracy, 5 Point Calibration) allows up to 500 data sets to be stored and recalled.

MEMORY INPUT:

During the measurement process, press MI key to input measured value into the memory, “Memory” indicator appears on the display.

MEMORY RECALL:

  1. Press MR Key in the measurement mode, the meter shows “LOC/P-01” (Data Log).
  2. Press ENTER key to confirm, the meter shows page number of the stored data.
  3. Press ▼ key, the meter shows date and time of the stored data (Format: mm-dd, hh-mm).
  4. Press ▼ key again, the display shows the stored data.
  5. After the browsing, press MEAS key to exit the current mode.

Communication

PH Meter with ORP/Ion (High Accuracy, 5 Point Calibration) provides a free Data Acquisition System that can be used to transfer data, receive the measuring values or import the data to Excel. Before using, ensure that Windows 7/8/10 operating system has been installed on your computer.

RECEIVING DATA:

  • 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”.
  • Click the OK button, the application starts.

  • Click the Connect button, the screen shows “Port is connected” indicate that communication between the meter and the computer has been established.
  • Click the OK button to confirm.
  • Click the Receive button, the stored data in meter will automatically send to computer.

INTERVAL RECORDING:

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

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

The first data need 1 minute to be display on screen.

Do not press any key on meter during the Interval Recording mode, it will cause communication interruption

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.

WARNING:

Once the software is closed, all received data will be lost and cannot be recovered.

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 into the electrode storage solution.

CLEANING THE ELECTRODE:

  • Salt deposits: Soak the electrode in warm tap water to dissolve deposits, then thoroughly rinse with distilled water.
  • 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.
  • 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.
  • 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 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.

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

ORP Electrode Care and Maintenance

  • Ensure that the ORP electrode is thoroughly washed with distilled water after each use.
  • In aggressive chemicals, dirty or viscous solutions, and solutions with heavy metals or proteins, take readings quickly and rinse electrode immediately after.
  • 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:

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

Oil and Grease Films:

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

Ion Selective Electrode Care and Maintenance

  • Ensure that the electrode is thoroughly washed with distilled water after each use.
  • DO NOT scratch the sensitive membrane on electrode during the measurement or calibration.
  • If you do not use the electrode for long periods, please store the electrode in a dry, cool and well-ventilated area.

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 P20 P21
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 Samples

Troubleshooting

LCD DISPLAY CAUSE CORRECTIVE ACTION
Electrode dried out Soak the pH electrode in 3M KCL solution for 10 minutes
Soak the Ion Selective Electrode in the diluted standard solution at least 15 minutes
Measured value is out of range Check the electrode whether clogged, dirty or broken
Incorrect calibration solutions Using the fresh calibration solutions for calibration
electrode is out of service life Replace the pH electrode or Ion Selective electrode

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