407510 Datasheet, PDF (3/8 Pages) Extech Instruments Corporation. – Heavy Duty Dissolved Oxygen Meter

Getting Started
Note: The dissolved oxygen probe assembly may be shipped to you
from the factory dry. If the probe does not contain electrolyte
solution, refer to the Electrolyte Replacement section of this manual
for the instructions for 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. Screw the electrolyte container back onto the electrode
holder and probe handle. Excess Electrolyte may be forced
out through the threads. Wipe clean.
4. Lightly tap the probe to remove any air bubbles.
Calibration
For first time use or after long periods (several days) of non-use, calibrate the instrument using
the following steps. The procedure should be performed in an open, well-ventilated area.
1. Ensure that the sensor is DISCONNECTED from the meter.
2. Turn ON the meter.
3. Slide the O₂/DO selector to the O₂ position.
4. Press the zero key to null the meter (the display should indicate "OO").
5. Connect the DO sensor to the top of the meter (remove the plastic probe head
protective cap).
6. Allow the meter to stand for at least five minutes until the display stabilizes.
7. Press the O₂ Cal key and the display will indicate approx. 20.9 (typical O₂ in air).
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407510 V7.0 10/06