Water Quality Meter with 11 Multiparameter (Basic)

This Water Quality Meter with 11 Multiparameter (Basic) is designed to measure ORP, pH, and DO of the liquids.

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GT00YY00ZU

Description

Overview

GAOTek Water Quality Meter with 11 Multiparameter (Basic) is designed to measure ORP, pH, and DO of the liquids. It automatically calculates and displays electrode slope that helps users decide whether to replace pH electrode or not. This instrument provides automatic or manual temperature compensation mode for optimum accuracy under variable temperature conditions. It allows up to 5 points calibration in the pH mode. The device is provided with the expanded memory that stores and recalls up to 500 readings. Manual temperature calibration of the meter improves temperature deviation.

Key Features 

  • Automatic Temperature Compensation provides accurate reading over the entire range.
  • Manual temperature calibration corrects temperature deviation.
  • Selectable temperature unit (°C or °F) meets different application requirements.
  • Calibration Due Reminder prompts the 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.
  • Automatic electrode diagnosis shows zero point offset and slope of the electrode.
  • Help message as an operational guide that helps you quickly begin using the meter.
  • System menu allows setting the 11 parameters, including the number of calibration points, measurement unit, stability condition, resolution etc.
  • 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.
  • Expanded memory stores and recalls up to 500 readings.

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, User-Defined Buffer
Temperature Compensation 32 °F~212 °F (0 °C~100 °C), Manual or Automatic
mV
Range -1999.9 mV ~1999.9 mV
Accuracy ± 0.2 mV
Resolution 0.1 mV, 1 mV
Calibration Points 1 point (Only for Relative mV mode)
Calibration Range ± 200 mV
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)
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 %
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, Measured value ± 50 °F (± 10 °C)
Others
Hold Function Manual or Automatic
Stability Conditions Low or High
Calibration Due 0 to 31 days
Power Off Manual or Automatic (10, 20, 30 minutes)
Reset Function Yes
Memory Stores up to 500 data sets
Output USB Communication Interface
Connector BNC
Display LCD
Power Requirements DC 5 V, using AC adapters, 220 V AC/50 Hz
Dimensions (L × W × H) 8.26 in × 7.40 in × 2.36 in (210 mm × 188 mm × 60 mm)
Weight 3.30 lbs (1.5 kg)

Additional Information

ACCESSORIES:

  • pH Electrode
  • Dissolved Oxygen Probe
  • Temperature Probe
  • pH Buffer Pouches (pH 4.01, 7.00, 10.01)
  • Electrolyte Solution
  • Membrane Cap
  • USB Cable
  • DC 5 V Power Adapter

Display
This water quality 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.

  1. Power the meter ON/OFF.
  2. Freezes the measured value on the display, press the key again to resume measuring.
  3. In the calibration or temperature setting mode, exits current mode and returns to measurement.

  1. Toggles between available measurement modes (pH, mV, ORP, and DO).
  2. Press and hold the key to enter temperature setting mode.

  1. Press the key to enter the calibration mode.
  2. Press and hold the key to enter the setup menu.

  1. Press the key to store current measured value.
  2. Press ▲ key in setup mode to scroll up through the menu.
  3. Press ▲ key in temperature setting mode to increase the setting values.

  1. Press the key to view calibration report or stored data.
  2. Press ▼ key in setup mode to scroll down through the menu.
  3. Press ▼ key in temperature setting mode to decrease the setting values.

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

Connectors
This device provides 5 connectors for connecting the various types of sensors.

CONNECTOR FUNCTION
pH/ISE For connecting the pH or ORP electrode
ATC For connecting the temperature probe
DO For connecting the dissolved oxygen probe
REF For connecting the reference electrode
USB/ For connecting the USB cable and DC 5 V 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.
The base of the electrode holder with an irregular round hole.

 

The electrode arm has a plastic rod.

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 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 AND ORP ELECTRODES:
Insert the BNC connector into the corresponding connector socket. Rotate and push the connector clockwise until it locks. After the connection is completed, DO NOT pull on the sensor cord. Always make sure that the connector is clean and dry.

FOR THE DISSOLVED OXYGEN PROBE:
Insert the 6-pin connector into corresponding connector socket, ensure the connector is fully seated.

 

Preparing the pH Buffer Solutions
This instrument is packaged with three pH buffer packets required for calibration.

  1. Open the pH 7.00 buffer packet, place the powder into 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 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 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.

Prior to Use
Remove the protective cap from the bottom of the sensor.

  1. 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 at least 15 minutes. DO NOT use distilled or deionized water, it will shorten the life of the sensor.
  2. FOR THE ORP ELECTRODE:
    Soak the electrode in 3 M KCl solution or tap water for 5 minutes.
  3. 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

  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. 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.
pH Mode

PARAMETER DESCRIPTION OPTIONS DESCRIPTION DEFAULT
bUF pH Buffers:
Select your desired pH buffer group for calibration and auto-recognition.		  USA USA (1.68, 4.01, 7.00, 10.01, 12.45) ●
 nIST NIST (1.68, 4.01, 6.96, 9.18, 12.45)
 dIN DIN (1.09, 4.65, 6.79, 9.23, 12.75)
 USEr User-Defined Buffer
 CAL Calibration Points:
Select the number of calibration points you intend to calibrate the meter.		  1 1 point
 2 2 points
 3 3 points ●
 4 4 points
 5 5 points
 rESO Resolution:
Sets the resolution for pH measurement.		  0.001 0.001 pH ●
 0.01 0.01 pH
 0.1 0.1 pH
 UNIT Measurement Unit:
Sets the default temperature unit.		  °C Degrees Celsius ●
 °F Degrees Fahrenheit

ORP MODE:

PARAMETER DESCRIPTION OPTIONS DESCRIPTION DEFAULT
rESO Resolution:
Sets the resolution for ORP measurement.		       0.1 0.1 mV ●
         1 1 mV

DISSOLVED OXYGEN MODE:

PARAMETER DESCRIPTION OPTIONS DESCRIPTION DEFAULT

CAL

 Calibration Points:

Select the number of calibration points.

          1 1 point ●
        2 2 points

 PrES

 Pressure Coefficient:
Select the default atmospheric pressure coefficient.		     760 Setting Range: 450 mmHg to 850 mmHg 760

 SAL

 Salinity Coefficient:
Select the salinity coefficient of the sample solution.		       0.0 Setting Range: 0.0 ppt to 50.0 ppt 0.0

rESO

 Resolution:
Sets the resolution for DO measurement.		     0.01 0.01 mg/L (0.1 %) ●
      0.1 0.1 mg/L (1 %)

UNIT

 Measurement Unit:
Sets the default measurement units.		   °C Degrees Celsius ●
   °F Degrees Fahrenheit
mg/L Milligrams per liter ●
ppm Parts per million
mmHg Pressure unit ●
kPa Pressure unit

GENERAL OPTIONS:

PARAMETER DESCRIPTION OPTIONS DESCRIPTION DEFAULT

 STA

 Stable Criteria:
Sets the stability criteria for measurement.
When the “LO” option is enabled, measuring value will stabilize quickly, but reading is less accurate. When the “HI” option is enabled, measuring value will stabilize slowly, but guarantees high accuracy.		       LO Low ●
      HI High

HOLD

Auto-Hold:
When the auto-hold function is enabled, the meter will automatically sense a stable end-point reading and freeze it.		     YES Enable
      NO Disable ●

 OFF

 Auto-Power Off:
When the auto-off power is enabled, if you do not press any key within a specified time period, the meter will automatically turn off.		        10 10 minutes
      20 20 minutes
      30 30 minutes
      NO Disable ●

CALL

 Calibration Due:
When calibration due reminder is enabled, if you do not recalibrate meter within a specified time period, the meter will automatically show  indicator.		 1….31 1 to 31 days
    OFF Disable ●

dAtE

 Date and Time:
Sets the date and time of the meter.		 — —

CLr

 Clear stored data:
Clear all stored data.		     YES Enable
      NO Disable ●

 rSt

 Reset:
Reset function allows the user to restore the meter back to factory default parameters. When this function is enabled, all calibration values and selected parameters will be lost or reset.		     YES Enable
      NO Disable ●

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:

  1. Place the temperature probe into the circular hole of electrode arm.
  2. Insert the connector of the temperature probe into corresponding connector socket (Marked “ATC”).
  3. 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▲ or ▼ key to set the temperature value of the sample.
  4. Press ENTER key to confirm, the meter returns to measurement mode. The setting is completed.

pH Calibration

This water quality meter 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:

  1. Make sure that you have selected 1 point calibration in the setup menu.
  2. Rinse the pH electrode with distilled water.
  3. Press CAL key, the meter shows “pH 7.00/CAL” (or “6.86/CAL”, “6.79/CAL”).
  4. 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 homogeneous solution.
  5. 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:

  1. Make sure that you have selected 2 to 5 points calibration in the setup menu.
  2. Repeat above steps. 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 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.
  4. Wait for the measured value to stabilize, the display shows “CAL3”. The meter prompts you to continue with third point calibration.
  5. Repeat the steps until the display shows “END”. The meter returns to measurement mode automatically. Calibration is completed.

ORP Calibration

This device 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  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.

DO Calibration in % Saturation Mode

This water quality meter 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 saturated anhydrous sodium sulphite solution (zero oxygen solution).

100% SATURATION CALIBRATION:

  1. Press MODE key until the meter shows  indicator.
  2. Make sure that you have selected 1 point calibration in the setup menu.
  3. Press CAL key, the meter enters calibration mode, the display shows “100%/CAL1”.
  4. 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:

  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”.
  4. Dip the dissolved oxygen probe into the saturated anhydrous sodium sulphite solution (zero oxygen solution). Stir the probe gently.
  5. Press ENTER key to confirm, “Calibration” indicator begins flashing.
  6. Wait for the measured value to stabilize, the display shows “100/CAL2”. The meter prompts you to continue with second point calibration.
  7. 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.

Performing a percentage saturation calibration will simultaneously calibrate the corresponding mg/L (or ppm) concentration value. Therefore, additional mg/L calibration isn’t required in most circumstances.

DO Calibration in mg/L or ppm Mode

  1. Press MODE key until the meter shows indicator and measurement unit “mg/L” or “ppm”.
  2. Make sure that you have selected 1 point calibration in the setup menu.
  3. If necessary, set the salinity and atmospheric pressure coefficient in the setup menu.
  4. Press CAL key, the display shows “8.25 mg/L/CAL1” (@77 °F (25 °C).
  5. Dip the dissolved oxygen probe into the air-saturated water for 3 to 5 minutes.
  6. Press ENTER key to confirm, “Calibration” indicator begins flashing.
  7. 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 “8.25 mg/L/CAL1” (@77 °F (25 °C).
  3. Press ▲ or ▼ key until the display shows “0.00 mg/L/CAL1”.
  4. Dip the dissolved oxygen probe into the saturated anhydrous sodium sulphite solution (zero oxygen solution). Stir the probe gently.
  5. Press ENTER key to confirm, “Calibration” indicator begins flashing.
  6. Wait for the measured value to stabilize, the display shows “8.25/CAL2”. The meter prompts you to continue with second point calibration.
  7. 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, if you want to exit calibration, press MEAS key, the meter will return to measurement mode immediately.

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 Mode:

  1. The device is equipped with a large backlit LCD display.
  2. 1 to 5 points push-button calibration with auto-buffer recognition.
  3. Selectable pH buffer standard (USA/NIST/DIN) or using the custom calibration solutions.
  4. Automatic electrode slope display helps the user decide whether to replace the sensor.

ORP Mode:

  1. Single point offset calibration allows adjusting the displayed value to a known standard.
  2. Relative and absolute millivolts measurement modes provide accurate ORP readings.

Dissolved Oxygen Mode:

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

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 water quality meter contains two millivolt measurement modes.

ABSOLUTE MILLIVOLT MODE:

Press MODE key until the display shows  indicator, the meter enters relative 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 the sample solution, stir the sensor gently. Wait for reading to stabilize, record the measured value on the display.

Dissolved Oxygen 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 MODE key until the meter shows  indicator.
  2. Connecting the dissolved oxygen probe to meter, wait for 15 minutes to polarize the sensor.
  3. If necessary, to set the atmospheric 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.
  5. 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

This device allows up to 500 data sets to be stored and recalled.

Communication 

This instrument comes with a free Data Acquisition System that can be used to transfer stored data, receive the measuring values or set the interval time for automatic recording. The system requirement is Windows XP or Windows 7.

RECEIVING DATA:

  1. 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”.
  2. Click the OK button, the application starts.
  3. Click the Connect button, the screen shows “Port is connected” indicate that communication between the meter and the computer has been established.
  4. Click the OK button to confirm.
  5. Click the Receive button, the stored data in the meter will automatically send to the computer.

INTERVAL RECORDING:

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

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

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.

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 in the electrode storage solution.

CLEANING THE ELECTRODE:

  1. Salt deposits: Soak the electrode in warm tap water to dissolve deposits, then thoroughly rinse with distilled water.
  2. 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.
  3. 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.
  4. 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 the 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.

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

ORP Electrode Care and Maintenance

  1. Ensure that the ORP electrode is thoroughly washed with distilled water after each use.
  2. In aggressive chemicals, dirty or viscous solutions, and solutions with heavy metals or proteins take readings quickly and rinse electrode immediately after.
  3. 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: 

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

Oil and Grease Films: 

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

DO Probe Care and Maintenance

  1. Please always keep probe’s membrane moist.
  2. 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 pH electrode in 3M KCL solution for 15 minutes
Measured value is out of range Check the electrode whether clogged, dirty or broken
 

Err

 Incorrect calibration solutions Using the fresh calibration solutions for calibration
Setting value does not match calibration solution Reset the calibration value
DO electrolyte solution is depleted Refilling electrolyte solution
Zero oxygen solution is contaminated Replace the calibration solution
pH electrode is out of service life Replace the pH electrode

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 ●

How to prepare the zero oxygen solution

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

How to prepare the electrode storage solution

Dissolve 22.365 grams of potassium chloride reagent (KCL) in the 100 mL distilled water, stir the solution until the solution has thoroughly mixed.

How to prepare the electrode storage solution

Dissolve 22.365 grams of potassium chloride reagent (KCL) in the 100 mL distilled water, stir the solution until the solution has thoroughly mixed.

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

 

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From our head office in New York City (NYC) and branch office in Canada, GAO Tek serves customers in 50 countries across the globe. Whether it is the USA and Canada, Asian countries such as Philippines, Malaysia, Indonesia, Singapore and Thailand, European countries including The United Kingdom, Germany, France, and Italy, the Middle Eastern countries such as Saudi Arabia, United Arabic Emirate (UAE), Turkey; or South Pacific countries such as Australia and New Zealand, our goal is to provide leading edge products and service to engineers in every industry.

We offer a wide range of high quality test and measurement equipment and drones that can be used in any number of global industries.  We strive to offer precision and reliable test instruments to you at affordable costs.  Our sales staff are here to answer any and all questions.

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US AND CANADIAN CITIES

Our Offices

Head Office US

GAO Tek Inc.
244 Fifth Avenue, Suite A31
Manhattan, New York,
N.Y., 10001
USA

Call Us

Toll Free: 1-877-585-9555

Email Us

sales@gaotek.com

Canadian Office

GAO Tek Inc.
1885 Clements Rd, Suites 215-218
Pickering, Greater Toronto Area
Ontario, L1W 3V4
Canada

Call Us

Toll Free: 1-877-585-9555
Phone: 289-660-5590
Fax: 289-660-5591

Email Us

sales@gaotek.com

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