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Dissolved Oxygen Meter with Salinity Correction (Reset)
Dissolved Oxygen Meter with Salinity Correction (Reset)

GAOTek Dissolved Oxygen Meter with Salinity Correction (Reset)

ID: GT00XV00ZW
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Overview

GAOTek Dissolved Oxygen Meter with Salinity Correction (Reset) is designed to measure DO of the liquids in the range from 0.00 mg/L ~ 20.00 mg/L with an accuracy of ± 0.5 mg/L. Manual salinity and barometric pressure compensations enhance the measurement accuracy.  The device’s auto-hold function freezes stable measured value for easy viewing and recording. Its system menu allows setting the 6 parameters, including the concentration unit, number of calibration points, temperature unit, hold function, etc. This instrument is suitable for education applications and ecological research.

Key Features

  • Automatic Temperature Compensation ensures accurate reading over the entire range.
  • Help message as an operational guide that helps you quickly begin using the meter.
  • Manual salinity and barometric pressure compensations improve the measurement accuracy.
  • This device is equipped with a large backlit LCD display.
  • 1 or 2 points calibration using the air-saturated water and zero oxygen solution.
  • Auto-Hold function freezes stable measured value for easy viewing and recording.
  • System menu allows setting the 6 parameters, including the number of calibration points,
    temperature unit, concentration unit, hold function, etc.
  • Reset feature automatically resumes all settings back to factory default options.

Technical Specifications

Dissolved Oxygen
Range 0.00 mg/L~20.00 mg/L (or ppm)
Accuracy ± 0.5 mg/L
Resolution 0.1 mg/L
% Saturation of Oxygen
Range 0.0%~200.0 %
Accuracy ± 10 % FS
Resolution 0.1 %
Others
Hold Function Manual or Automatic endpoint detection
Temperature Compensation 32 °F~104 °F (0 °C~40 °C)
Barometer Pressure Correction 60.0 kPa~112.5 kPa, 450 mmHg ~850 mmHg
Salinity Correction 0 g/L~35 g/L
Sensor Type DO 100 Polarographic DO Probe
Power Off Manual or Automatic (180 minutes)
Reset Function Yes
Connector 6-pin Mini Plug
Display LCD 5.31 in×2.95 in (135 mm×75 mm)
Power Requirements DC 9 V, using AC adapters, 220 V AC/50 Hz
Dimensions (L × W × H) 8.26 in × 8.07 in × 2.95 in (210 mm × 205 mm × 75 mm)
Weight 3.30 lbs (1.5 kg)

Additional Information

Applications:

  • Environmental monitoring and ecological research
  • Water and wastewater treatment
  • Education applications

Accessories:

  • Dissolved Oxygen Probe
  • Electrolyte Solution
  • Membrane Cap
  • DC 9 V Power Adapter

Display

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

Keypad

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

KEY FUNCTIONS
 
  • Power the meter ON/OFF.
  • Freezes the measured value on the display, press the key again to resume measuring.
  • In the calibration or temperature setting mode, exits current mode and returns to measurement.
MODE
  • Toggles between % saturation and concentration modes.
 
  • Press the key to enter the calibration mode.
  • Press and hold the key to enter the setup menu.
°C
  • Press the key to set the temperature or enter the temperature calibration mode.
  • Press the key to increase the setting value.
  • Press the key to decrease the setting value.
ENTER
  • Confirms the calibration, setting value or displayed option.

 

Connecting the Electrode Holder

The meter comes with an easy-to-use holder for mounting the DO 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 the desired position.

ADJUSTMENT OF ELECTRODE ARM:

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

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

Connecting the DISSOLVED OXYGEN Probe

  1. Place the DO probe into left or right sides of the electrode arm.
  2. 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.
  2. Fill the membrane cap halfway with an electrolyte solution.
  3. Screw the membrane cap onto the probe, excess electrolyte will drain out.
  4. Be sure the cathode of the probe makes contact with membrane cap, the electrolyte solution in membrane cap should be without an air bubble.

Connecting the Power Adapter

  1. Before plugging in the power adapter, ensure the voltage of power adapter matches your local main voltage.
  2. Insert the connector of power adapter into the meter power socket, the meter is now ready for use

Prior to Use

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

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

PARAMETER DESCRIPTION OPTIONS DESCRIPTION DEFAULT
 CAL Calibration Points  1 1 point
 2 2 points
 PrES Barometric Pressure Coefficient  760 Setting Range: 450 mmHg to 850 mmHg 760
 SALt Salinity Coefficient  0.0 Setting Range: 0.0 ppt to 35.0 ppt 0.0
 Unit Measurement Unit  ºC Degrees Celsius
 ºF Degrees Fahrenheit
mg/L Concentration unit
ppm Concentration unit
% % saturation
 HOLD Auto-Hold  YES Automatically freezes a stable reading
 NO Disable
 OFF Auto-Power Off  YES Automatically turn off the meter
 NO Disable
 rST Reset  YES Restore factory settings
 NO Disable

Setting the Default Parameters:

  1. Press and hold the key for 3 seconds to enter setup menu, the meter shows selected salinity coefficient.
  2. Press ▲ or ▼ key to set the parameter, press ENTER key to confirm. The meter goes to barometric pressure option, the display shows 760 mmHg.
  3. Press ▲ or ▼ key to set the barometric pressure value, press ENTER key to confirm. The meter goes to calibration point selection mode, the display shows 1 point calibration.
  4. Press ▲ or ▼ key to select the number of calibration points, press ENTER key to confirm. The display shows concentration unit “mg/L”.
  5. Press ▲ or ▼ key to select the measurement units, press ENTER key to confirm. The meter shows “HOLD/NO” indicating that the auto-hold function is disabled.
    If the auto-hold function is enabled, the meter will automatically sense a stable endpoint reading and freeze it. If you disable this function, the meter allows you to freeze the reading by pressing the HOLD key.
  6. Press ▲ or ▼ key to enable or disable the auto-hold function, press ENTER key to confirm. The meter shows “OFF/NO” indicating that the auto-off function is disabled.
    When the auto-off function is enabled, if you do not press any keys within 3 hours, the meter will automatically turn off.
  7. Press ▲ or ▼ key to enable or disable the auto-off function, press ENTER key to confirm. The meter shows “RST/NO” indicating that the meter should not be reset.
  8. Press ▲ or ▼ key to enable or disable the reset function, press ENTER key to confirm. The meter returns to measurement mode. The 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.

DO Calibration in % Saturation Mode

This 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, it is recommended that you perform 100% saturation calibration in the air. For the 2 points calibration, you need to use zero oxygen solution.

100% SATURATION CALIBRATION:

  1. Make sure that you have selected 1 point calibration in the setup menu.
  2. After the DO probe is connected to the meter, turn the meter on 10 to 15 minutes to polarize the sensor.
  3. Press CAL key, the meter enters calibration mode, the display shows “CAL1/100%”.
  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. Repeat the steps given above. When the first calibration point is done, the display shows “CAL2/0 ”. The meter prompts you to continue with second point calibration.
  3. Dip the dissolved oxygen probe into the zero oxygen solution. Stir the sensor gently.
  4. 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, if the temperature reading displayed differs from that of an accurate thermometer, you need to calibrate the meter.

  1. Press the °C key 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.

Measurement

This instrument 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, sulphur 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.

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

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
—– DO probe does not connect to meter Check the connector of sensor
Measured value is out of range Check the DO membrane whether clogged, dirty or broken
 Err DO electrolyte solution is depleted Refill electrolyte solution
Zero oxygen solution is contaminated Replace the calibration solution

Pressure VS Altitude Table

ALTITUDE (m) kPa mmHg
0 101.3 760
100 100.1 750
200 98.8 741
300 97.6 732
400 96.4 723
500 95.2 714
600 94.0 705
700 92.8 696
800 91.7 688
900 90.5 679
1000 89.4 671
1100 88.3 662
1200 87.2 654
1300 86.1 646
1400 85.0 638
1500 84.0 630
1600 82.9 622
1700 81.9 614
1800 80.9 607
1900 79.9 599
2000 78.9 592

How to prepare the zero oxygen solution

Dissolve 500 mg of sodium sulphite reagent and a small amount of cobalt (II) chloride hexahydrate (CoCl2 ● 6H2O) in the 250 ml distilled water, mix the solution until reagent is completely dissolved

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