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Contech CDO-01 Instruction Manual

Dissolved oxygen-meter
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INSTRUCTION MANUAL
DISSOLVED OXYGEN-METER
MODEL CDO-01
EL-221, MIDC Electronic Zone, Mhape, Navi Mumbai-400710. Tel: 022-

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  • Page 1 INSTRUCTION MANUAL DISSOLVED OXYGEN-METER MODEL CDO-01 EL-221, MIDC Electronic Zone, Mhape, Navi Mumbai-400710. Tel: 022-...
  • Page 2 61393000 CHAPTER 1 INTRODUCTION Contech CDO-01 measures Dissolved Oxygen and temperature of liquids. It can be used in a variety of fields such as industrial, agriculture, environmental studies and scientific research laboratory. ABOUT CDO-01 MODEL. Dissolved Oxygen meter, Model CDO-01, is a microprocessor based instrument, which measures Dissolved oxygen and salinity and temperature of a liquid under test.

  • Page 3: Do Meter Display

     Temperature calibration.  Atmospheric Pressure Entry. CHAPTER 2 DO METER DISPLAY DO METER KEYBOARD...
  • Page 4 CHAPTER 3 BASIC OPERATION AND SETUP PARAMETERS 3.1 POWER AND INSTALLATION REQUIREMENTS The meter requires good stable power. Meter is supplied with a 9V/1A switching adapter. Connect the adaptor to the instrument to the power jack located at the rear side of the meter.

  • Page 5: Changing Modes

    3.3 CHANGING MODES. to change between DO and CONDUCTIVITY modes. Press key to change between Saturated DO %, Do in ppm and mg/L. 3.4 SETUP PARAMETERS 3.4.1 SETTING DATE AND TIME. Meter has an inbuilt Real Time clock. Hence there is no need to change or update date and time.
  • Page 6 Press key. The Meter displays and subsequently displays Press key till it displays Press key. Meter displays current date say 07. Follow the instructions below for changing date, month and year. Meter Displays the current time, say 12.23.45...
  • Page 7 Press key to change hour. Follow the instructions below for changing Hour and Minute 3.4.2 TO SET BAUD RATE Press key. The Meter displays and subsequently displays...

  • Page 8: To Set Temperature

    Press key. Meter displays the set baud rate say 9600. Press key to change between 1200, 2400, 4800 and 9600 and press key to save. Press key to quit without saving 3.4.3 TO SET TEMPERATURE (For Manual Temperature Compensation) Press key.
  • Page 9 Press key. The Meter displays and subsequently displays Press key till it displays Press key. Meter shows the current serial number. Press key to change the serial number and press key to save. Press key to quit without saving Press key to make the reading 0000.
  • Page 10 keys to change between and Press key to save. Press key to discard changes and quit. 3.4.6 TO SET PRINT FORMAT. There are 6 print formats available in the meter. - ONLY DO/Cond - SERIAL NO, DO/Cond - SERIAL NO, DATE,DO/ Cond - SERIAL NO, TIME, DO/Cond - SERIAL NO, DATE, TIME, DO/Cond - SERIAL NO, DO/Cond, TEMPERATURE...
  • Page 11 Press key to discard changes and quit. 3.4.7 . TO SET PRINT TYPE. Meter can be set to print the results in Horizontal and vertical form A Typical printout in the horizontal form appears as below. 12.30.34 7.75 mg/L 12.30.45 7.82 mg/L While a printout in vertical mode is as shown below.
  • Page 12 3.4.8. TO SET MACHINE ID. Machine identification number can be assigned to the meter using this option. Press key. The Meter displays and subsequently displays Press key till it displays Press key. Follow the instructions given below for setting id. 3.4.9.
  • Page 13 and subsequently displays Press key till it displays Press key. Meter will display the current value of coefficient say 2.00 key to change and Press to save. Press key to discard changes and quit. 3.4.10. TO SET NORMALISATION TEMPERATURE. Using Automatic temperature compensation, Meter compensates for temperature variations of a solution from the normalization temperature set.
  • Page 14 3.4.11. TO SET CELL CONSTANT. Press key. The Meter displays and subsequently displays Press key till it displays Press key. Meter will display the current value of cell constant say 1.00 key to change and Press to save. Press key to discard changes and quit. 3.4.12.

  • Page 15: Dissolved Oxygen Measurements

    Press key to discard changes and quit. CHAPTER 4 DISSOLVED OXYGEN MEASUREMENTS 4.1.. DO ELECTRODE.
  • Page 16 CDO-01 Electrode is illustrated above. It is a Polarographic type electrode. It needs about 5 minutes of electrode polarization whenever it is switched on. It has a removable electrode cap for convenience. It has an outer calibration cover which protects the membrane cap. Unscrew the bottom lid and check if the sponge is still soaked.

  • Page 17: Zero Oxygen Calibration

    Electrode also has sensors for measuring salinity. Ensure that the salinity sensor is completely immersed in the liquid under test for effecting proper salinity correction. 4.2. DO ELECTRODE CALIBRATION. Put the meter on. Polarize the electrode for atleast 5 minutes by connecting it to the meter.
  • Page 18 meter need not be calibrated for zero oxygen levels unless the conditions mentioned above occur. For zero oxygen calibration, mix 5g of anhydrous sodium sulphite (Na ) into 100 ml of pure distilled water. Mix it thoroughly to make a homogenous solution. Polarize the electrode for 15 minutes by connecting it to the meter.
  • Page 19 Meter is now calibrated for zero and saturated oxygen. It displays 4.3. SALINITY ELECTRODE CALIBRATION. CDO-01 can be calibrated for salinity in both manual and auto modes. Automatic calibration can be done in Conductivity mode only. But Manual calibration also can be performed .
  • Page 20 Calibrate the meter frequently atleast once a week for better results. There may be situations where the meter must be calibrated before use. 4.3.1 SETTING AUTO / MANUAL MODES. Press key. The Meter displays and subsequently displays Press key till it displays Press key.

  • Page 21: Salinity Calibration

    keys to change between (Single) and (Multiple) Press key to select the mode. 4.3.3 SALINITY CALIBRATION. Meter can be calibrated for Conductivity in Automatic and Manual Modes. 4.3.3.1 Automatic Conductivity calibration. 1. Select AUTO mode as per 4.1 above 2. Select conductivity mode. 3.

  • Page 22: Manual Conductivity Calibration

    In SINGLE( ) mode calibration type, Calibration values of all the ranges will be Changed, while in MULTI( ) mode Calibration of only the current range ( Range 200 – 2000uS/cm) will be changed. 4.3.3.2 Manual Conductivity calibration. 1. Select MANUAL mode as per 4.1 above 2.

  • Page 23: Temperature Calibration

    Press key. Meter calibrates to the new value and displays the results as below. In SINGLE( ) mode calibration type, Calibration values of all the ranges will be Changed, while in MULTI( ) mode Calibration of only the current range ( Range 200 – 2000uS/cm) will be changed. 4.4 TEMPERATURE CALIBRATION To calibrate the temperature sensor, Keep the meter in Conductivity measurement mode.

  • Page 24: Dissolved Oxygen Measurement

    Keep the key pressed , till meter displays Subsequently meter displays Upper display shows the measured temperature and lower display shows the temperature to be set. Press key to change the temperature to the known value and press key to save the new temperature calibration. Meter will start displaying the new value.

  • Page 25: Conductivity Measurement

    CHAPTER 5 CONDUCTIVITY MEASUREMENT CDO-01 measures conductivity of a solution in 5 measurement ranges, 0.00 – 20.00uS/cm, 20.0 – 200.0 uS/cm, 200 – 2000 uS/cm, 2.00 – 20.00 mS/cm, 20.0 – 200.0 mS/cm. Meter shifts the range automatically whenever measured value crosses the limits.
  • Page 26 Refer to section 3.4.12 for more details. Conductivity Electrode: CDO-01 meter DO electrode is used for measuring salinity. DO electrode has inbuilt sensor for measuring salainit. The sensor portion should be fully immersed in the liquid under test.

  • Page 27: Chapter 5 Data Logging

     Electrodes should be calibrated using calibration buffers that bracket the expected value of the sample. Calibration should be performed on a daily basis or more frequently if sample throughput is high.  Stirring the sample during measurement is recommended but is not essential. But same procedure must be followed for both calibration and measurement.

  • Page 28: Start Data Logging

    5.1 SET DATA LOGGING INTERVAL Press key. The Meter displays and subsequently displays Press key till it displays Press key. Meter displays the set baud rate say 5 seconds Press key to change between 5S, 10S, 20S, 30S, 60S, 120S, 300S and press key to save.

  • Page 29: Data Recall

    and it stops saving further data. 5.3 DATA RECALL. Press key. Meter displays and followed by Press key to scan through the saved data. Press to quit. TO PRINT DATA Press key . A sample printout appears as below. 7.85 mg/L 26.9 7.93 mg/L 26,7 8.25 mg/L 25.2 8.35 mg/L 24.3...

  • Page 30: To Recall Data

    Press key. The Meter displays and subsequently displays Press key till it displays Press key. Meter displays Press key again, Meter displays All the stored data will be cleared. 6.2 TO STORE DATA Press key. Meter displays . The measurement data along with date, time and temperature will be stored in memory.

  • Page 31: To Print Data

    and followed by Press key to display saved data. Press to quit. 6.4 TO PRINT DATA Press key. Printout format can be selected by 3.4.6 and 3.4.7 in Chapter 3. Selected Format Print output - ONLY DO/Cond - SERIAL NO, DO/Cond - SERIAL NO, DATE,DO/ Cond - SERIAL NO, TIME, DO/Cond - SERIAL NO, DATE, TIME, DO/Cond...

  • Page 32: Print Options

    Pin 2 – RXD – Receive Data Pin 3 - TXD – Transmit Data Pin 7 – Ground. The Serial data transmitted and received are in standard ASCII mode ( +/- 12V) - ASYNCHRONOUS , 8 BITS, NO PARITY, 1 STOP BIT. Baud rate: Selectable from 1200, 2400 ,4800 and 9600.
  • Page 33 - Press key to print current DO/Cond through RS232 port. - Continuous data transfer to computer/printer through RS232 port. option: - ONLY DO/Cond - SERIAL NO, DO/Cond - SERIAL NO, DATE,DO/ Cond - SERIAL NO, TIME, DO/Cond - SERIAL NO, DATE, TIME, DO/Cond - SERIAL NO, DO/Cond, TEMPERATURE Print type (Horizontal or Vertical) –...

  • Page 34: Specifications

    Press key till it displays Press key. Meter Prints report of last calibration as below. CONTECH DISSOLVED OXYGEN METER MODEL : CDO-01 MACHINE ID : ABCDEFGH CAL. DATE CAL. TIME SPECIFICATIONS 1. Model : CDO-01 2. DO Range : 0 –...
  • Page 35 6. Calibration Mode : Single or Multiple 7. Dissolved Oxygen : Zero and Saturated % calibration 8. Accuracy : ±1% Full Scale 9. Temperature compensation : Auto or Manual 10. Temperature range : 0 to 100 C in 0.1 deg increments 11.

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