Dissolved Oxygen Calibration & Measurement
1. Rinse the DO electrode
with clean water and wipe
with lint-free tissue.
2. Place the DO electrode in water vapor-
saturated air (calibration bottle with moist
sponge) or in air-saturated water.
3. Press CAL button on the meter to switch to
calibration mode.
4. Press ENT button to confirm the DO reading. To abort calibration, press
MEAS button.
Make sure that the DO cap and temperature
sensor of the DO electrode are fully
immersed in the sample.
5. Immerse the DO electrode in zero solution (0.2% sodium sulfite) and repeat
step nos. 3 - 4 to perform zero calibration (optional).
6. Rinse the DO electrode with clean water and wipe with lint-free tissue.
7. Immerse the DO electrode in sample.
Make sure that the DO cap and temperature sensor of the DO electrode are fully immersed in the zero
solution.
In step no. 3, CAL button must be pressed twice so that the meter will switch to zero calibration mode.
Quick Guide
LAQUA WQ-300 Series
Handheld Meters
www.horiba-laqua.com
The meter will show DONE
briefly then switch to
measurement mode. The
calibrated DO value and the
electrode icon will appear in
measurement mode.
Press
There should be no water droplets on
the DO cap and temperature sensor.
P/N: 3200832950
CODE: GZ0000584707
Press
Two calibration modes are available in the
DO meter:
1.
DO saturation (%)
2.
DO concentration (mg/L)
The default mode is the former. Press
MODE button to switch to the latter.
100% is displayed at the bottom of the screen. The
icon
on the screen and the LED light on the electrode (if switched
on) will blink until the reading is stable.
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