User Guide Dissolved Oxygen Meter Model DO210
Introduction Thank you for choosing the Extech Dissolved Oxygen / Temperature Meter which simultaneously displays Dissolved Oxygen and Temperature or Oxygen in air and Temperature. Units of measure are mg/l for Dissolved Oxygen, % for Oxygen in air, and oC/oF for temperature. Oxygen is measured with a remote sensor that also contains a thermistor for measuring air temperature. Advanced features include altitude and % salt compensation, data hold, auto shut off, and Min/Max recording. Meter Description 1.
Getting Started Note: The dissolved oxygen probe assembly may be shipped from the factory dry. If the probe does not contain electrolyte solution, refer to the Electrolyte Replacement section below for information on adding the electrolyte solution prior to initial use. Filling the Electrolyte Container Prior to Initial Use 1. Unscrew and remove the electrolyte container from the tip of the probe. 2. Fill the electrolyte container with new electrolyte. 3.
Dissolved Oxygen (DO) Measurements Measurement Preparation Before taking measurements, perform the calibration described above if necessary. Taking Measurements 1. 2. 3. 4. 5. Press and hold the Function button for at least 2 seconds to change from %O2 to mg/L or from mg/L to %O2. For DO measurements select mg/L (milligrams per liter). Immerse the probe in the solution under test. For optimum automatic temperature compensation, immerse the probe to a depth of at least 4" (10 cm).
MIN/MAX Data Recording When selected, the Data Recording function records the Min/Max readings. To start a data recording session: 1. Press the REC button once. The REC indicator will appear on the display. Press the REC button again and REC MAX will display on the screen along with the maximum value. 2. Press the REC button again and the display will show REC MIN and the minimum value will be displayed. 3.
Altitude Compensation Adjustment (HIGH) If the measurement environment is not at sea level the altitude (HIGH) value must be adjusted as described below: 1. Press and hold the Settings button for 5 seconds (until a beep is heard); the meter will then display the word HIGH on the lower left and the altitude compensation value in the upper LCD area in larger digits 2. Press ENTER and the HIGH symbol will flash 3. Use the ▲ and ▼ buttons to set the desired altitude compensation in meters 4.
Battery Replacement The 9V battery that powers the instrument requires replacing when the battery icon flashes on the display. To replace the battery follow the steps below: 1. Disconnect the probe from the instrument. 2. Open the rear battery compartment using a screwdriver to remove the two Phillips head screws that secure the compartment. 3. Carefully remove the old battery from the compartment lid chamber and gently unsnap the battery’s terminals from the wired (red/black) connectors. 4.
Probe Head Replacement The probe head (on the tip of the probe) holds a thin Teflon® membrane and an electrolyte container. Calibration errors or reading errors could indicate loss of electrolyte or a dirty/damaged membrane. The membrane is very delicate and can easily be damaged if it comes in contact with solid objects. Replacement probe heads are available from an Extech distributor. Replacement procedure 1. Unscrew the probe head and empty the old electrolyte from the container. 2.
Specifications General Specifications Circuit Custom one‐chip LSI microprocessor circuit Display Dual function LCD Measurements Dissolved Oxygen %O2 or mg/l (milligrams per liter); Oxygen in air: %; Temperature: °C/°F Data hold Data hold key freezes displayed reading Sensor Structure Remote Polarographic Dissolved Oxygen Sensor Data recording Min/Max memory and recall Auto power off Meter turns off after 10 minutes (can be disabled) Sample rate 1.0 Second (approx.
