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Conductivity Meter with Resistivity Meter (TDS and Salinity)
Conductivity Meter with Resistivity Meter (TDS and Salinity)

Conductivity Meter with Resistivity Meter (TDS and Salinity)

ID: GT00YZ00ZM
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Overview

GAOTek Conductivity Meter with Resistivity Meter (TDS and Salinity) is designed by 1 to 5 points push button calibration with automatic calibration solution recognition for accuracy of 0.5% F.S. 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 function continuously with multimode power scheme such as battery, USB port and power adapter. It provides the calibration due reminder to calibrate the meter regularly. The conductivity 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.
  • 1 to 5 points push-button calibration with automatic calibration solution recognition.
  • Selectable cell constant (0.1/1/10), normalization temperature 68 °F/ 77 °F (20/25°C), TDS conversion factor, linear and pure water compensation modes, seawater and practical salinity measurement modes.
  • 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.
  • System menu allows setting the 11 parameters, including the number of calibration points,
    resolution, stability condition, measurement unit, 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
  • Multi-mode power scheme (battery, power adapter, computer’s USB port)
  • Supports 2 connectors for connecting the various types of sensors

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)
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
Temperature
Range 32 ˚F ~ 221 ˚F (0 ˚C ~ 105 ˚C)
Accuracy ± 0.5 °C, ± 0.5 °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  6-pin mini plug
Memory Up to 500 sets
Calibration Due 0 to 31 days
HOLD Function Manual or Automatic
Stability Conditions Low or High
Reset Function Yes
Battery Type 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 10.58 oz. (300 g)

Additional Information

Applications

  • Water quality monitoring
  • Geological and ecological research
  • Cooling towers
  • Printing industry
  • Swimming pools and Spas
  • Agriculture and aquaculture
  • Aquariums
  • Education and lab applications

Display

This Conductivity Meter with Resistivity Meter (TDS and Salinity) 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.

Connectors

This Conductivity Meter with Resistivity Meter (TDS and Salinity) 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.

When batteries are depleted, the meter allows you to use the USB cable connected to computer as a temporarily power supply.

Connecting the Conductivity Electrode

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

Prior to Use

Soak the conductivity electrode for a few minutes in tap water to remove dirt and oil stains on the electrode.

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

This Conductivity Meter with Resistivity Meter (TDS and Salinity) contains an integrated setup menu that allows you to customize each displayed option to meet measurement requirements.

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.

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

The Conductivity Meter with Resistivity Meter (TDS and Salinity) provides a quick manual calibration mode that allows 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.
  3. Press ENTER key to confirm, the display shows “1/CELL”.
  4. Press ▲or▼key until the display shows “USER” (User-defined) option. 
  5. Press ENTER key to confirm, the meter enters User Defined mode

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

7.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.

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

Conductivity Meter with Resistivity Meter (TDS and Salinity) 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.

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 Resistivity Meter (TDS and Salinity) 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.

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