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GAOTek Conductivity Meter with DO (Salinity and Resistivity)
GAOTek Conductivity Meter with DO (Salinity and Resistivity)

Conductivity Meter with DO (Salinity and Resistivity)

ID: GT00YZ00ZL
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Overview

GAOTek Conductivity Meter with DO (Salinity and Resistivity) measures dissolved oxygen in the range of 0.00 mg/L~20.00 mg/L and is designed by 1 to 5 points push button calibration for an accuracy of ± 0.5% F.S. The instrument contains 5 measurement modes, and it is suitable for measuring the resistivity, conductivity, salinity, TDS, and dissolved oxygen of the liquids. It provides the expanded memory storage and recalls up to 500 readings. This high-performance conductivity meter supports built-in real time clock to stamp the stored data to meet GLP standard. This device functions continuously with multi-mode power schemes such as power adapter, battery, and USB port.

Key Features

  • System menu allows setting the 13 parameters, including the number of calibration points, resolution, stability condition, measurement unit, etc.
  • Auto-Hold function freezes stable measured value for easy viewing and recording.
  • Stability indicator automatically shows current measurement status.
  • Manual temperature calibration corrects temperature deviation.
  • Built-in real-time clock stamps stored data to meet GLP standard.
  • Stored data can be transferred into computer by USB communication interface.
  • Automatic Temperature Compensation provides accurate reading over the entire range.
  • Calibration due reminder prompts the user to calibrate the meter regularly.
  • Selectable temperature unit (°C or °F) meets different application requirements.
  • Help message as an operational guide that helps you quickly begin using the meter.
  • Reset feature automatically resumes all parameters back to factory default settings.
  • Expanded memory stores and recalls up to 500 readings.
  • Multi-mode power scheme (battery, power adapter, computer’s USB port) ensures the meter to work smoothly.

Technical Specifications

Conductivity
Range 0 µS/cm to 20 µS/cm

200 µS/cm

2000 µS/cm

20.00 mS/cm

200.0 mS/cm

Accuracy ± 0.5 % F.S
Calibration Points 1 point to 5 points
Calibration Solutions 10 µS/cm, 84 µS/cm, 1413 µS/cm,

12.88 mS/cm,111.8 mS/cm

Temperature Coefficient 0.0 % to 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)
Temperature Compensation 32 ˚F ~ 212 ˚F (0 ˚C ~ 100 ˚C), Manual or Automatic
TDS
Range 0 ppt to 100 ppt (max.200 ppt, depending on factor setting)
Accuracy ± 1 % F.S
TDS Factor 0.1 to 1.0 (Default 0.5)
Salinity
Range 0 ppt to 10 ppt (Max 80 ppt)
Accuracy ± 1 % F.S
Measurement Modes Seawater or Practical salinity
Resistivity
Range 0 mΩ to 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 mmHg ~ 850 mmHg

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 ± 0.9 °F, ± 0.5 °C
Resolution 32.18 °F (0.1 °C)
Calibration Points 1 point
Calibration Range ± 10 °C measured value
Others
Output USB communication interface
Connector 6-pin mini plug
Memory Stores up to 500 data sets
Calibration Due 0 to 31 days
Hold Function Manual or Automatic
Stability Conditions Low or High
Reset Function Yes
Power Requirements 3 x 1.5 V “AA” batteries
Battery Life 150 hours approximately
Dimensions 6.7 in × 3.35 in × 1.18 in (170 mm × 85 mm × 30 mm)
Weight 0.66 lbs (300 g)

Additional Information

Conductivity/TDS/Salinity/Resistivity Mode:

  • Linear or pure water compensation improves the measurement accuracy of the meter.
  • 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.
  • The device is equipped with a large backlit LCD display.
  • 1 to 5 points push-button calibration with automatic calibration solution recognition.

Dissolved Oxygen Mode:

  • 1 or 2 points calibration using the air-saturated water and zero oxygen solution.
  • Manual salinity and barometric pressure compensation to improve the measurement accuracy.

ACCESSORIES:

  • Conductivity Electrode
  • Dissolved Oxygen Probe
  • Temperature Probe
  • Conductivity Calibration Solutions (84 µS/cm, 1413 µS/cm, 12.88 mS/cm)
  • Electrolyte Solution
  • membrane Cap
  • AA Batteries

Display

This instrument 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 the each function key controls.

Key Description
MEAS| · Power the meter ON/OFF.

· Freezes the measured value on the display, press the key again to resume measuring.

· In the calibration or setting mode, exits current mode and returns to measurement.

MODE|°C · Toggles between available measurements modes (Conductivity, TDS, Salinity, Resistivity, and DO).

· Press and hold the key to enter temperature setting mode.

CAL| · Press the key to enter the calibration mode.

· Press and hold the key to enter the setup menu.

MI| · Press the key to store current measured value.

· Press key in setup mode to scroll up through the menu.

· Press key in temperature setting mode to increase the setting value.

MR| · Press the key to view calibration report or stored data.

· Press key in setup mode to scroll down through the menu.

· Press key in temperature setting mode to decrease the setting value.

ENTER| · Confirms the calibration, setting value or displayed option.

· Press and hold the key to turn On/Off the backlight.

Connectors

This conductivity meter provides 2 connectors for connecting the various types of sensors. Listed in the below table are the details of these connectors.

No Connector Function
1 Phone Jack For connecting the temperature probe
2 6-pin connector For connecting the conductivity electrode

Inserting the Batteries

Before using the meter, insert three 1.5V “AA” alkaline batteries into battery compartment, follow the procedure outlined below.

  1. Remove the battery cover from meter’s backside.

2.Insert the batteries into the battery compartment, note polarity.

3.Replace the battery cover into its original position. Installation is completed.

Connecting the Conductivity Electrode

  • Take out the sensor from the carrying case.
  • Insert the 6-pin connector into corresponding connector socket. Ensure the connector is fully seated.
  • After the connection is completed, do not pull on the sensor cord. Always make sure that the connector is clean and dry.

Refilling Electrolyte Solution for DO Probe

  1. Unscrew the membrane cap from the bottom of the dissolved oxygen probe.

  1. Fill the membrane cap halfway with an electrolyte solution.

  1. Screw the membrane cap onto the probe, excess electrolyte will drain out.
  2. Be sure the cathode of the 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 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:

Connect the probe to meter, turn on the meter 10 to 15 minutes and wait for the probe to polarize.

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 device contains an integrated setup menu that allows you to customize each displayed option to meet measurement requirements.

CONDUCTIVITY/TDS/SALINITY/RESISTIVITY MODES:

DISSOLVED OXYGEN MODE:

GENERAL OPTIONS:

Setting the Default Parameters

  1. Press and hold the key for 3 seconds to enter setup menu, the display shows selectable parameter and page number.

  1. .Press ▲ or ▼key to scroll through menu, select the parameter you want to set.
  2. Press ENTER key to confirm, the display shows an option in the submenu.

4.Press ▲ or ▼ key to select the desired options

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

EXIT THE SETUP MENU:

During the setup mode, press MEAS key, the meter will return to measurement mode immediately.

Setting the Date and Time

The meter 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 key for 3 seconds to enter the setup menu.
  2. Press ▲ or ▼ key until the display shows “DATE” option.

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

  1. Press ▲ or ▼ key to set the year.
  2. Press ENTER key to confirm, the meter shows current date and time.

  1. Press ▲ or ▼ key to set the date and time.
  2. Press ENTER key to confirm, the meter returns to measurement mode. The 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:

  • Insert the connector of temperature probe into the meter’s phone jack.

  • The “ATC” indicator will show 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 the °C key to enter temperature setting mode.
  3. Press ▲ or ▼ key to set the temperature value of sample.
  4. Press ENTER key to confirm, the meter returns to measurement mode. Setting is completed.

Conductivity Calibration

The device is capable of using the three types of conductivity electrode. Before calibration or measurement, you need to choose different sensors as per your sample concentration. The table below shows available sensor and its effective measuring ranges.

SENSOR 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, 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 showsindicator.
  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 electrode into the conductivity calibration solution, the display automatically shows current calibration standard (e.g., 1413 µS/cm).

  1. Press ENTER key to confirm, the default calibration value begins flashing.

  1. 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 setup menu.
  2. Repeat steps 1 to 5 above in the single point calibration, 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 display automatically shows current calibration standard (e.g., 88 mS/cm).
  4. Press ENTER key to confirm, the default calibration value begins flashing.

5.Wait for the reading to stabilize, the display will show “CAL3”. The meter prompts you to continue with third point calibration.

6.Repeat the steps 3 to 5 until the display shows “END”. The meter returns to measurement mode. Calibration is completed.

Manual Calibration

  1. The device provides a quick manual calibration mode that allows the user to easily calibrate the meter.
  2. Record the cell constant value on the electrode (e.g., K=1.08).
  3. Press and hold the key for 3 seconds to enter setup menu.
  4. Press ENTER key to confirm, the display shows “1/CELL”.
  5. Press ▲or▼key until the display shows “USER” (User-defined) option.
  6. Press ENTER key to confirm, the meter enters User Defined mode

7.Press ▲or▼key to set each digit according to previous record.

8.Press ENTER key to confirm until the setting values stop flashing. The meter return to measurement mode. Setting is completed.

Conductivity Calibration Report

This program lets you check the calibration factor of the conductivity electrode.

  1. Press MR Key in the conductivity 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 calibration point and calibration factor (e.g., K=0.998).
  5. After the browsing, press MEAS key to exit the current mode.

DO Calibration in % Saturation Mode

The device 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, perform 100% saturation calibration in the air. For the 2 points calibration, you need to use saturated anhydrous sodium sulfite solution (zero oxygen solution).

100% SATURATION CALIBRATION:

  1. Press MODE key until the meter shows indicator and measurement unit “%”.

  1. Make sure that you have selected 1 point calibration in the setup menu.
  2. Press CAL key, the meter enters calibration mode, the display shows 100%/CAL1”.

  1. Hold the dissolved oxygen probe in the air or place the sensor into the air-saturated water for 3 to 5 minutes, press ENTER key to confirm. Wait for the measured value to stabilize, the display shows “END”. Single point calibration is completed.

2 POINTS CALIBRATION:

  1. Make sure that you have selected 2 points calibration in the setup menu.
  2. Press CAL key, the meter shows “100/CAL1”.
  3. Press ▲or▼ key until the display shows “0/CAL1”.

  1. Dip the dissolved oxygen probe into the saturated anhydrous sodium sulfite solution (zero oxygen solution). Stir the probe gently.
  2. Press ENTER key to confirm, “Calibration” indicator begins flashing.

  1. Wait for the measured value to stabilize, the display shows “100/CAL2”. The meter prompts you to continue with second point calibration.

  1. Dip the dissolved oxygen probe into the 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

  1. Press MODE key until the meter shows indicator and measurement unit “mg/L” or “ppm”.

  1. Make sure that you have selected 1 point calibration in the setup menu.
  2. If necessary, set the salinity and barometric pressure coefficient in the setup menu (Refer to Setup Menu section).
  3. Press CAL key, the display shows “8.25mg/L/CAL1” (@25°C).

  1. Dip the dissolved oxygen probe into the air-saturated water for 3 to 5 minutes.
  2. Press ENTER key to confirm, “Calibration” indicator begins flashing.

  1. 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:

  1. Make sure that you have selected 2 points calibration in the setup menu.
  2. Press CAL key, the meter shows “8.25mg/L/CAL1” (@25°C).
  3. Press ▲or▼ key until the display shows “0.00mg/L/CAL1”.

  1. Dip the dissolved oxygen probe into the saturated anhydrous sodium sulfite solution (zero oxygen solution). Stir the probe gently.
  2. Press ENTER key to confirm, “Calibration” indicator begins flashing.

  1. Wait for the measured value to stabilize, the display shows “8.25/CAL2”. The meter prompts you to continue with second point calibration.

  1. Dip the dissolved oxygen probe into the 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.

EXIT THE CALIBRATION:

During the calibration process, press MEAS key, the meter returns to measurement mode immediately

Temperature Calibration

During the measurement mode, 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 the 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.

Conductivity/TDS/Resistivity Measurement

  1. Press MODE key until the meter shows “COND” (Conductivity) or “TDS” (TDS) or “RES” (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 “SAL” indicator and measurement unit “PSU”, the meter is now enters practical salinity measurement mode.

  1. If necessary, press MODE key again, the meter shows “SAL” indicator and measurement unit “ppt”, the meter is now enters seawater measurement mode.
  2. Select the desired measurement mode. Dip the electrode into sample solution. Stir the sensor gently.
  3. Wait for the reading to stabilize, record the measured value on the display.

Dissolved Oxygen Measurement

The meter is suitable for measuring the water, wastewater, brine and other liquids. If you use the 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, sulfide, and alga, the membrane on the probe will be blocked, damaged or eroded.

  1. Press MODE key until the meter showsindicator
  2. Connect the dissolved oxygen probe to meter, wait for 15 minutes to polarize the sensor.
  3. If necessary, to set the barometric pressure and salinity coefficient in the setup menu (Refer to “SETUP MENU” section).
  4. Submerge probe in the sample solution, make sure the temperature sensor on the probe is fully immersed.

  1. Stir the probe gently, wait for the reading to stabilize, record the measured value on the display.

Hold Function

The device 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

The meter allows up to 500 data sets to be stored and recalled.

MEMORY INPUT:

In the measurement mode, 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

Conductivity Meter with Salinity Meter (Reset Function) 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.

Conductivity Electrode Care and Maintenance

  • Ensure that the conductivity electrode is thoroughly washed with distilled water after each use.
  • 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.

DO Probe Care and Maintenance

  • Please always keep probe’s membrane moist.
  • If you do not use the dissolved oxygen probe for long periods, please screw off membrane cap and rinse the probe’s cathode, anode and the membrane with deionized water, then soak up residual water on them with filter paper, and install the probe

Troubleshooting

LCD DISPLAY CAUSE CORRECTIVE ACTION
Electrode dried out Soak the conductivity electrode in tap water for 10 minutes
Electrode does not suit the current sample Replace the conductivity electrode
Measured value is out of range Check the electrode whether dirty or broken
Setting value does not match calibration solution Reset the calibration value
Electrode is broken Replace the conductivity electrode
Keypad is not working properly Replace the batteries

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