Extech DO600 Operating Manual

User's Guide

ExStik® DO600

Dissolved Oxygen Meter

RECALL

Dissolved Oxygen

DO600

Introduction

Congratulations on your purchase of the ExStik® DO600 dissolved oxygen / temperature meter which simultaneously displays dissolved oxygen and temperature. Units of measure are % saturation, mg/l or ppm for dissolved oxygen, and °C or °F for temperature. Advanced features include Data Hold, 25 points memory, auto power off, automatic temperature compensation, salinity and altitude compensation. Careful use and maintenance will provide years of reliable service.

Meter Description

Front Panel Description

1. Battery compartment cover

2. LCD Display

3. MODE/HOLD button

4. CAL/RECALL button

5. ON/OFF button

6. Electrode Retaining Collar

7. Dissolved Oxygen Sensor

8. Bonded Membrane Cap assembly

9. Membrane & Cathode

(Note: The Electrode storage cap is not shown)

Electrode Bottom View

LCD Display

1. Bargraph display

2. Measurement units

3. Main display

4. Low Battery indicator

5. Temperature display

6. Reading hold indicator

Cathode

Membrane

3 4

RECALL

DissolvedOxygen

DO600

7 8 9

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Operation®

Powering the ExStik®

The ExStik® uses four (4) CR2032 Lithium Ion Batteries. Press the ON/OFF button to turn the meter on or off. If the batteries are weak, the ‘BAT’ indicator appears on the LCD. The auto power off feature shuts the ExStik inactivity. The auto power off feature may be temporarily disabled for convenience or for extended polarization time.

Turn-On Diagnostics

1. When the meter is turned ON, the LCD displays “SELF” and “CAL” and the meter enters into a diagnostics mode.

2. During this time the meter is recalling the User Calibration data, performing self diagnostics & initializing the circuitry.

3. After this function is complete, the meter proceeds to the normal measurement mode.

Measurements

1. Cover the electrode with the electrode cap. The sponge contained in the cap should be moistened (not soaked) with DI (distilled water) or clean tap water.

2. Pressing the ON/OFF button turns the meter ON or OFF. When turned ON, the meter’s display switches on and the Self Calibration utility runs (see below). The unit of measure selected when the meter was last turned OFF will be remain on the display.

3. Wait 10 minutes to 2 hours for the probe to polarize (disable auto-power off). The reading should be approx. 101.7% (saturation) after the electrode has completely polarized. Percent (%) Saturation is one of the meter’s three units of measure. If the meter is not in this display mode, press and hold the MODE/HOLD button until % is displayed on the LCD, release the button. The electrode is fully polarized when the readings stop drifting and settle down. If the unit does not read 101.7% then recalibration is necessary

4. Select the desired units of measure by pressing and holding the MODE/HOLD button until the proper units are shown in the display. Remove the electrode cover and place the electrode in the sample to be measured. Stir the electrode in the sample to remove any trapped air bubbles from the membrane surface. Do not submerse the electrode to the point that the sample liquid reaches the meter’s electrode collar.

5. Allow the meter time to settle to the final measurement value. Note: The larger the difference in temperature between the electrode and the solution the longer it will take for the reading to stabilize. Stabilization time can vary from ten (10) seconds to five (5) minutes.

off automatically after approximately 10 minutes of

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Calibration

1. Calibration should be performed on a daily basis.

2. Turn the meter ON

3. Press and hold the MODE/HOLD button until % is displayed on the LCD.

4. Allow the electrode to fully polarize. (readings are stable)

5. Place the electrode cap onto the electrode. The sponge contained in the cap should be moistened (not soaked) with DI (distilled water) or clean tap water. Be sure that the electrode membrane is clean and dry membrane, as skin oil will affect the electrode response.

6. Wait until the reading stabilizes then press and hold the CAL/RECALL button until CAL is shown in the lower display. The readings will blink “101.7” and “SA” will appear.

7. When the calibration is complete “End” will appear and then the meter will return to the normal measurement mode.

Note: The “SA” will not appear if the calibration fails.

8. Optional ’zero oxygen’ calibration: (improves measurement accuracy for very low or very high DO measurements) Place the electrode in a zero oxygen calibration solution, such as 5% sodium sulfite, wait for stability and press the CAL/RECALL button until CAL is shown in the in the lower display. Stability in a zero solution may take many minutes, depending on electrode history. Note : Sodium Sulfite can become deposited on the electrode and on the “coined” surface of the electrode retaining collar. The presence of the Sodium Sulfite will negatively affect future DO measurements until such a time where ALL of it is removed from the electrode.

or the calibration will be incorrect. Never touch the

Measurement Units

The meter can be set to measure % saturation, dissolved oxygen in mg/l, and dissolved oxygen in parts per million (ppm). To change the mode:

1. Press and hold the MODE/HOLD button for 2 seconds and the display will begin to scroll through the different units of measure :

% saturation; D.O. in mg/l; D.O. in ppm (parts per million)

2. When the desired units are displayed, release the MODE/HOLD button and the unit will return to normal operating mode.

Note: The “HOLD” function cannot be on when changing the measurement function. If “HOLD” is displayed in the lower left corner of the display, briefly press the MODE/HOLD button to turn it off.

Temperature Units (ºF / ºC)

1. With the unit OFF, press and hold the CAL/RECALL button.

2. With the CAL/RECALL button depressed, momentarily press the ON/OFF button to turn the unit ON.

3. The CAL/RECALL button can be released when ‘Self Cal’ is shown in the display.

Salinity Compensation

1. With the unit ON, momentarily press the CAL/RECALL button twice in quick succession (‘SAL’ is shown in the lower temperature display).

2. Momentary press the MODE/HOLD button. Each press of the MODE/HOLD button increases the compensation by 1ppt (part per thousand); the available range is 0 to 50ppt.

3. Momentarily press the CAL/RECALL button to save the compensation setting and return to the normal measurement mode.

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