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V7.0 10/06

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Dissolved Oxygen (DO) Measurements

Measurement Preparation

Before taking measurements, perform the calibration described above if necessary. In addition,

perform the % SALT and ALTITUDE compensation adjustments as described below:

% SALT Compensation

not to have a salt content, set the % Salt factor to 0%.

1.

Press the % Salt key. The display will indicate 0% on the middle portion of the LCD

display and S on the bottom portion of the LCD.

2.

Pressing the Factor Adj. key once will add 1% to the salt factor.

3.

Press the Factor Adj. key until the correct factor is displayed.

4.

Press the % Salt key to store the factor.

NOTE: 1% = 10 ppt (parts per thousand)

ALTITUDE Compensation

The meter has a default calibration for sea level operation (0 meters). Any significant

deviation from sea level requires a compensation adjustment. Perform the following steps to

do so:

1.

Press the ALTITUDE key and the display will indicate a “0” in the middle of the LCD

and an “H” on the lower portion of the LCD.

2.

Press the Factor Adj. key once to add 100 meters, twice to add 200 meters, and so on.

Maximum compensation is 3900 meters.

3.

Once the desired compensation is displayed, press the ALTITUDE key again to store

the value.

Taking Measurements

1.

Immerse the probe in the solution under test. For best automatic temperature

compensation, immerse the probe to a depth of at least 4" (10 cm).

2.

Wait until the display stabilizes.

3.

The velocity of the liquid coming into contact with the probe must be at least 0.6 to 1

ft/min (0.2 to 0.3 m/s). If the solution is standing, stir the solution with the probe or use

an agitator.

4.

Rinse the probe with clean water after each use.

Oxygen in Air (O2) Measureme

nts

Follow the same steps above for DO measurements except for the variations described below:

1.

2.

The display will indicate the oxygen air value in %.

Temperature Measurements

The lower display will indicate the temperature of the measured solution. Press the

change the temperature units.