Xylem DO600 Dissolved Oxygen Meter - Manual (Page 3)

DO600 - Version 5.0 8/05 3
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
® off automatically after approximately 10 minutes of
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.