2
Preparing electrode
1. Remove the protective cap from the holder.
2. Remove the DO tip (35660-64) from the package.
3. Remove the short socket and the paper cap from the
DO tip.
4. Attach the DO tip to the holder.
5. Attach the protective cap securely to the holder.
Do not dispose of the short socket that was removed. It is
necessary when storing the electrode.
Screw the protective cap on firmly, until it stops. When
attaching the DO tip to the electrode body, make sure that
the O-ring is attached to the DO tip.
Measurement
Air calibration
1. Clean the electrode with tap water and remove any drop
of liquids from the membrane at the end of the DO tip,
by wiping away the liquid with a soft cloth.
2. Calibrate the electrode in clean air.
Equalizing the temperatures of the DO electrode and the air
is important for achieving a proper air calibration. If
possible, allow the DO electrode to sit in the open air for a
short time (approx. 20 minutes) prior to calibration.
Avoid calibrating in places with extreme temperature
fluctuations, places exposed to the wind or the rain, and
places near heating equipment.
Do not grasp the holder during or immediately before/after
calibration. The body temperature affects the stability of the
readings.
Short socket
DO tip
Paper cap
Standard solution calibration and sample measurement
1. Clear the electrode with tap water and dry it with a soft
cloth, each time prior to immersing it in the solution.
2. Measure the DO while moving the electrode up and
down (at a speed of approx. 20 cm/s to 30 cm/s).
The electrode membrane is thin and easily torn. Place it into
solution slowly.
Do not cause any damages to the lead and the electrode
when immersing the electrode in the solution.
Do not shake the electrode holding the lead in your hand,
and do not pull or tie the lead.
When immersing the electrode in the solution, make sure
that the temperature sensor is completely immersed.
Stir the DO electrode in the solution, so that the
temperature of the electrode becomes the same as that of
the solution.
Make sure the membrane has no dirt or air bubbles on it.
Make sure the flow speed on the surface of the membrane is
kept constant.
Maintenance
After finishing measurement, wash the DO electrode
well with tap water, then keep it immersed in tap water.
Leave the electrode connected to the meter.
If the electrode membrane is dirty, clean it by using a
soft cloth, taking care not to scratch the membrane.
Then, rinse the membrane with tap water.
If an error occurs during the calibration, replace the DO
tip.
Storage
The electrode should remain to be connected to the
meter during storage.
To store the electrode without the meter, follow the below
procedure.
1. Remove the electrode from the connector on the meter.
2. Clean the electrode well with tap water, then dry it with a
soft cloth.
3. Remove the DO tip from the holder.
4. Put the short socket on the DO tip, then store it in a cool,
dark location with an oxygen scavenger.
Avoid storing the electrode in hot place or places with high
humidity. Store the electrode indoors and out of direct sunlight.
