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GAOTek Water Quality Meter with 12 Multiparameter (Data Storage)
GAOTek Water Quality Meter with 12 Multiparameter (Data Storage)

GAOTek Water Quality Meter with 12 Multiparameter (Data Storage)

ID: GT00YY00ZW
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Overview

GAOTek Water Quality Meter with 12 Multiparameter (Data Storage) is suitable for measuring the pH, mV, Conductivity and TDS of liquids. In the Conductivity/TDS mode the instrument features 1 to 5 points push-button calibration with automatic calibration solution recognition, selectable cell constant (0.1/1/10), normalization temperature, TDS conversion factor and linear or pure water compensation mode. System menu allows setting the 12 parameters, including the number of calibration points, resolution, stability condition, measurement unit, etc. Stored data can be transferred into computer by USB communication interface.

Key Features

  • Equipped with a large backlit LCD display
  • In pH mode, 1 to 5 points push-button calibration with auto-buffer recognition and in conductivity/TDS Mode 1 to 5 points push-button calibration with automatic calibration solution recognition
  • Automatic electrode slope display helps user decide whether to replace sensor
  • Selectable cell constant (0.1/1/10), normalization temperature 68 °F/77 °F (20 °C /25°C), TDS conversion factor and linear or pure water compensation mode.
  • 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 is an operational guide that helps user 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 into 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 or User-defined Buffer
Temperature Compensation 32 °F – 212 °F (0 °C – 100 °C)
Compensation Mode Manual or Automatic
mV
Range -1999.9 mV – 1999.9 mV
Accuracy ±0.2 mV
Resolution 0.1 mV, 1 mV (Selectable)
Calibration Points 1 point (Only for Relative mV mode)
Calibration Range ±200 mV
Ion
Range 0.001 ppm – 19999 ppm, mg/L, mol/L (depending on the range of ISE)
Accuracy ±0.5 % F.S (monovalent), ±1 % F.S (divalent)
Resolution 0.001, 0.01, 0.1, 1
Calibration Points 2 to 5 points
Calibration Solutions 0.001 ppm, 0.01 ppm, 0.1 ppm, 1 ppm, 10 ppm, 100 ppm, 1000 ppm, 10000 ppm, mg/L, mol/L
Temperature Compensation 32 °F – 212 °F (0 °C – 100 °C)
Compensation Mode Manual or Automatic
Conductivity
Range 0 µS/cm  – 20.00 µS/cm, 200.0 µS/cm, 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 %/°C – 10.0 %/°C
Compensation Modes Linear or Pure Water
Cell Constant K=0.1, 1, 10 or User-defined
TDS
Range 0 ppt – 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 ppt – 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
Dissolved Oxygen
Range 0.00 mg/L – 20.00 mg/L (or ppm)
Accuracy ±0.2 mg/L
Resolution 0.01 mg/L
Calibration Points 1 or 2 points
Temperature Compensation 32 °F – 122 °F (0 °C – 50 °C), Automatic
Pressure Correction 60.0 kPa – 112.5 kPa, 450 mm Hg – 850 mm Hg
Salinity Correction 0 g/L – 50 g/L
% Saturation of Oxygen
Range 0.0 % – 200.0 %
Accuracy ±2.0 %
Resolution 0.1 %, 1 %
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 Measured value ±(10 °C) 50 F
Others
Hold Function Manual or Automatic
Stability Conditions Low or High
Calibration Due 0 to 31 days
Power Off Manual or Automatic (10 minutes, 20 minutes, 30 minutes)
Reset Function Yes
Memory Stores up to 500 data sets
Output USB Communication Interface
Connector BNC, 6-pin Mini Plug
Display LCD
Power Requirements DC 5 V, using AC adapter, 220 V AC/50 Hz
Dimensions 8.2 in x 7.4 in x 2.3 in (210 mm × 188 mm × 60 mm)
Weight 3.3 lbs (1.5 kg)

Additional Information

Display

This instrument is equipped with a clear and bright LCD display that is used to show measured values, mode indicators and help message.

The following table describes the meaning of each indicator.

  Measurement mode indicator: Indicates meter is in the measurement mode
  Calibration mode indicator: Indicates meter is in the calibration mode
  Electrode slope indicator: Indicates the average slope of the pH electrode
  Stable indicator: Indicates the measured value has stabilized
  Setup mode indicator: Indicates meter is in SETUP mode
  Hold indicator: Indicates the displayed value has been frozen
  Memory mode indicator: Indicates data is stored into memory
  Calibration Due Reminder: Prompts user to calibrate the meter regularly

Keypad

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

MEAS

  • Powers the meter ON/OFF.
  • Freezes the measured value on the display, user needs to press the key again to resume measuring
  • In the calibration or temperature setting mode, this key exits current mode and returns to measurement.

 MODE

  • Toggles between available measurements modes (pH, mV, ORP, Ion, Conductivity, TDS, Salinity, Resistivity, DO).
  • Press and hold this key to enter temperature setting mode.

CAL

  • Press this key to enter the calibration mode.
  • Press and hold this key to enter the setup menu.

 MI

  • Press this key to store current measured value.
  • Press the key in setup mode to scroll up through menu.
  • Press the key in temperature setting mode to increase the setting values.

 MR

  • Press the key to view calibration report or stored data.
  • Press this key in setup mode to scroll down through menu.
  • Press this key in temperature setting mode to decrease the setting values.

 ENTER

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

Connectors

The instrument is equipped with 6 connectors for connecting the various types of sensors.

Listed in the below table are the details of these connectors.

CONNECTOR FUNCTION
pH/ISE For connecting the pH, ORP or Ion Selective Electrodes
ATC For connecting the temperature probe
DO For connecting the dissolved oxygen probe
COND For connecting the conductivity electrode
REF For connecting the reference electrode
USB For connecting the USB cable and DC5V 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.

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

2. The electrode arm has a plastic rod.

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

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, ORP or ION Selective Electrodes:

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.

For the Conductivity Electrode or Dissolved Oxygen Probe:

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

Preparing the pH Buffer Solutions

The instrument is packaged with three pH buffer packets required for calibration.

  1. Open the pH 7.00 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.
  2. Preparation of pH 4.01 and pH 10.01 standard buffer solutions are the same as above.
  3. Prepared standard buffer solutions should be stored in hermetically sealed glass containers.

Refilling Electrolyte Solution for DO Probe

  1. Unscrew the membrane cap from the bottom of the dissolved oxygen probe.
  2. Fill the membrane cap halfway with electrolyte solution.
  3. Screw the membrane cap onto the probe, excess electrolyte will drain out.
  4. Be sure the cathode of probe makes contact with membrane cap, the electrolyte solution in membrane cap should be without an air bubble.

Prior to Use

Remove the protective cap from the bottom of the sensor.

  • 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 atleast 15 minutes. DO NOT use distilled or deionized water, it will shorten the life of sensor.
  • For the ORP Electrode: Soak the electrode in 3 M KCL solution or tap water for 5 minutes.
  • For the Ion Selective Electrodes: Soak the electrode in the diluted standard solution (e.g., 100 ppm) for at least 15 minutes.
  • For the Conductivity Electrode: Soak the electrode for a few minutes in tap water to remove dirt and oil stains on the electrode.
  • For the Dissolved Oxygen probe: Connecting the probe to meter, turn on the meter 10 to 15 minutes and wait for the probe to polarize.

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.

Setup Menu

Setting the Default Parameters

  1. If necessary, press MODE key until the display shows corresponding mode indicator (e.g., pH mode).
  2. Press and hold the SETUP key for 3 seconds, the meter enters setup menu, the display shows selectable parameter and page number.
  3. Press Up or Down key to scroll through menu, select the parameter you want to set.
  4. Press ENTER key to confirm, the display shows an option in the submenu.
  5. Press Up or Down key to select the desired option.
  6. Press ENTER key to confirm, the meter returns to measurement mode. Setting is completed.

Exit the Setup Menu

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

Setting the Date and Time

This instrument has a real time clock that is used to time-stamp stored measured value and calibration data. Follow the steps below to set the date and time during the first use.

  1. Press and hold the SETUP key for 3 seconds to enter the setup menu.
  2. Press Up or Down key until the display shows “DATE” option.

3. Press ENTER key to confirm, the meter shows current year.

4. Press Up or Down key to set the year.

5. Press ENTER key to confirm, the meter shows current date and time.

6. Press Up or Down key to set the date and time.

7. Press ENTER key to confirm, the meter returns to measurement mode. Setting is completed.

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 show on the display, the meter is now switched to automatic temperature compensation mode.

Manual Temperature Compensation

  • DO NOT connect the temperature probe to meter.
  • Press and hold the °C key for 3 seconds to enter temperature setting mode.
  • Press Up or Down key to set the temperature value of sample.
  • Press ENTER key to confirm, the meter returns to measurement mode. Setting is completed.

pH Calibration

The instrument allows up to 5 points calibration in the pH mode. The user is advised to 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

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 “pH 7.00/CAL” (or “pH 6.86/CAL”, “ pH 6.79/CAL”).

  • Dip the pH electrode into the pH 7.00 (or pH 6.86, or pH 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 1 to 5 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., pH 4.01). 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 3 until the display shows “END”. The meter returns to measurement mode automatically. Calibration is completed.

pH Calibration with the User-Defined Buffers

  • 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.
  • 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.
  • Press Up or Down key to increase or decrease displayed value, press ENTER key to confirm. “Calibration” indicator begins flashing.
  • Wait for the measured value to stabilize, the display shows “CAL2”. The meter prompts you to continue with second point calibration.
  • Rinse the pH electrode with distilled water. Dip the electrode into the next custom buffer solution.
  • Press Up or Down key to increase or decrease displayed value, press ENTER key to confirm. “Calibration” indicator begins flashing.
  • Wait for the measured value to stabilize, the display shows “END”. The meter automatically returns to measurement mode. Calibration is completed.

ORP Calibration

The instrument 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.

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

Ion Concentration Calibration

The instrument supports ion concentration calibration up to 5 points with minimum of 2 points. To obtain accurate measurement results, we recommend that you perform ion calibration and measurement at same temperature. If you are not calibrating the meter or calibration is not successfully, the display will always show “0.000”.

  • Press MODE key until the meter shows indicator.
  • If necessary, select the concentration unit and ion valence (Monovalent or Divalent) in the setup menu.
  • Press CAL key, the meter shows 0.001 ppm (or mg/L, mol/L, mmol/L).
  • If necessary, press Up or Down key to select the desired calibration point (e.g., 0.01 ppm).
  • Rinse the Ion Selective Electrode with distilled water, then rinse with a small amount of ion standard solution.
  • Dip the electrode into corresponding calibration solution. Stir the sensor gently to create a homogenous solution.
  • 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.
  • Rinse the Ion Selective Electrode with distilled water. Dip the electrode into corresponding calibration solution. Stir the sensor gently.
  • 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.
  • 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.

Conductivity Calibration

The instrument 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.

Single Point Calibration

  • Press MODE key until the meter shows indicator.
  • Rinse the conductivity electrode with distilled water, then rinse with a small amount of calibration solution.
  • Press CAL key, the meter enters the calibration mode.
  • Dip the conductivity electrode into the calibration solution, the meter automatically shows current calibration standard (e.g., 1413 µS/cm).
  • Press ENTER key to confirm, “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 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 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).
  • Press ENTER key to confirm, “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 steps 3 to 4 above until the display shows “END”. The meter returns to measurement mode automatically. Calibration is completed.

Manual Calibration:

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

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

DO Calibration in % Saturation Mode

This instrument can be calibrated quickly in air. In the percentage saturation mode, the meter is able to perform either 1 or 2 points calibration. For single point calibration, we recommend that you perform 100% saturation calibration in the air. For the 2 points calibration, you need to use saturated anhydrous sodium sulphite solution (zero oxygen solution).

100 % Saturation Calibration

  • Press MODE key until the meter shows indicator and measurement unit “%”.
  • Make sure that you have selected 1 point calibration in the setup menu.
  • Press CAL key, the meter enters calibration mode, the display shows “100 %/CAL1”.
  • Hold the dissolved oxygen probe in the air, press ENTER key to confirm. Wait for the measured value to stabilize, the display shows “END”. Single point calibration is completed.

2 Points Calibration

  • Make sure that you have selected 2 points calibration in the setup menu.
  • Press CAL key, the meter shows “100/CAL1”.
  • Press Up or Down key until the display shows “0/CAL1”.
  • Dip the dissolved oxygen probe into the saturated anhydrous sodium sulphide solution (zero oxygen solution). Stir the probe gently.
  • Press ENTER key to confirm, “Calibration” indicator begins flashing.
  • Wait for the measured value to stabilize, the display shows “100/CAL2”. The meter prompts you to continue with second point calibration.
  • Dip the dissolved oxygen probe into air-saturated water for 3 to 5 minutes, press ENTER key to confirm. Wait for the measured value to stabilize, the display shows “END”. The meter returns to measurement mode automatically. Calibration is completed.

DO Calibration in mg/L or ppm Mode

  • Press MODE key until the meter shows indicator and measurement unit “mg/L” or “ppm”.
  • Make sure that you have selected 1 point calibration in the setup menu.
  • If necessary, set the salinity and atmospheric pressure coefficient in the setup menu.
  • Press CAL key, the display shows “8.25 mg/L/CAL1” (@25 °C).
  • Dip the dissolved oxygen probe into the air-saturated water for 3 to 5 minutes.
  • Press ENTER key to confirm, “Calibration” indicator begins flashing.
  • Wait for the measured value to stabilize, the display will show “END”. The meter returns to measurement mode automatically. Single point calibration is completed.

2 Points Calibration

  • Make sure that you have selected 2 points calibration in the setup menu.
  • Press CAL key, the meter shows “8.25 mg/L/CAL1” (@25 °C).
  • Press Up or Down key until the display shows “0.00 mg/L/CAL1”.
  • Dip the dissolved oxygen probe into the saturated anhydrous sodium sulphite solution (zero oxygen solution). Stir the probe gently.
  • Press ENTER key to confirm, “Calibration” indicator begins flashing.
  • Wait for the measured value to stabilize, the display shows “8.25/CAL2”. The meter prompts you to continue with second point calibration.
  • Dip the dissolved oxygen probe into air-saturated water for 3 to 5 minutes, press ENTER key to confirm. Wait for the measured value to stabilize, the display shows “END”. The meter returns to measurement mode automatically. Calibration 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.

  • Press and hold the °C key for 3 seconds to enter temperature calibration mode, the display shows current temperature reading.

  • Press Up or Down key to set the temperature value.
  • Press ENTER key to confirm. Calibration is completed.

pH Measurement

  • Press MODE key until the meter shows indicator.
  • Rinse the pH electrode with distilled water to remove any impurities adhering to the probe body.
  • Dip the electrode into the sample solution, stir the sensor gently.
  • Wait for the reading to stabilize, record the measured value on the display.

ORP Measurement

The instrument contains two millivolt measurement modes.

Absolute Millivolt Mode: Press MODE key until the display shows measurement unit “mV”, the meter is now enters absolute millivolt measurement mode.

Relative Millivolt Mode:

  • Press MODE key until the display shows ORP 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 the reading to stabilize, record the measured value on the display.

Ion Concentration Measurement

  • Press MODE key until the meter shows ION indicator.
  • Rinse the Ion Selective Electrode thoroughly with distilled water. Dip the electrode into the sample solution.
  • 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.
  • Stir the sensor gently. Wait for the reading to stabilize, record the measured value on the display.

Conductivity/TDS/Resistivity Measurement

  • Press MODE key until the meter shows (Conductivity) or (TDS) or (Resistivity) indicator.

  • Rinse the conductivity electrode thoroughly with distilled water.
  • Dip the electrode into the sample solution, stir the sensor gently.
  • Wait for the reading to stabilize, record the measured value on the display.

Salinity Measurement

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

  • Press MODE key until display shows SAL indicator and measurement unit “PSU”, the meter is now enters practical salinity measurement mode.
  • If necessary, press MODE key again, the meter shows SAL indicator and measurement unit “ppt”, the meter is now enters seawater measurement mode.

  • Select the desired measurement mode. Dip the electrode into sample solution. Stir the sensor gently.
  • Wait for the reading to stabilize, record the measured value on the display.

Dissolved Oxygen Measurement

The instrument is suitable for measuring the water, wastewater, brine and other liquids. If you use meter to measure seawater or other water containing large amounts of salt, please set the salinity coefficient before use. Some gas and steam such as chloride, sulfur dioxide, sulfureted hydrogen, ammonium, carbon dioxide and iodine can permeate the membrane via diffusion. So their existence will influence the measurement of dissolved oxygen. If the sample contains solvent, grease, sulphide and alga, the membrane on the probe will be blocked, damaged or eroded.

  • Press MODE key until the meter shows DO indicator.
  • Connecting the dissolved oxygen probe to meter, wait for 15 minutes to polarize the sensor.
  • If necessary, to set the atmospheric pressure and salinity coefficient in the setup menu (Refer to “SETUP MENU” section).
  • Submerse probe in the sample solution, make sure the temperature sensor on the probe is fully immersed.

  • Stir the probe 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 key, the meter will immediately freeze currently displayed value. Press the key again to resume measuring.

Storing and Recalling Data from Memory

The meter 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:

  • Press MR key in the measurement mode, the meter shows “LOC/P-01” (Data Log).

  • Press ENTER key to confirm, the meter shows page number of the stored data.

  • Press Down key, the meter shows date and time of the stored data (Format: mm-dd, hh-mm).

  • Press Down key again, the display shows the stored data.

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

Communication Software

Running the Software: Click the Data Acquisition System icon on the start bar, the DAS splash screen appears for few seconds and then the application starts.

Receiving the Stored Data: Connect the USB cable to meter and computer (communication port: COM1, baud rate: 9600). Click the Receive button, the stored data in meter will automatically send to computer.

Searching the Data: If you would like to search a specific measured value from the database or uploaded data, click the Search button, the screen will show a Search Criteria dialog. Available search criteria include the time and sample name. After selecting or entering the search criteria, click the OK button, the screen will show all qualified records.

Print the Report: If you would like to print current data, click the Print button, the printer will output data sheet.

Data Recall: DAS data acquisition system has a large database used to store the all uploaded data. If you need to view previous data, click the Recall button, the screen will show all data in the database.

Delete the Data: If you need to delete the certain data, click on the data field, then click the Delete button. Note: Once deleted, the data cannot be recovered.

Graph Mode: The graph mode will help user to view variations of the measured parameter continuously. Click the Graph button, the screen will immediately show curve graph, measuring value and temperature.

Interval Measurement and Automatic Recording: This function helps you automatically record the measuring value within the specify time period. Click the Interval Measurement button, the screen will show a dialog box. Selecting the time interval and recording time, click the OK button, the measured value will automatically transfer to data sheet.

Create the Excel Data File: When the transfer is complete, click the “Import data into Excel” button, the measured value in the data sheet will be converted to Excel file. You can follow the path below to find the Excel file: C:>Program Files>Data Acquisition System>Excel

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