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100% Saturated Calibration
It is suggested to perform the slope calibration in water‑saturated air.
Pour water into a small beaker.
Rinse the polarized probe with clean water.
Dry the probe tip and allow a few seconds for the LCD reading to stabilize (probe in air).
Suspend probe with membrane just over the beaker of water. Press CAL/MODIFY key.
The “ ” tag will be displayed along with “WAIT” blinking on the LCD until
the reading is stable.
When the reading is stable and is within the limits, “CFM” tag starts
blinking. Press GLP/CFM key to confirm the 100.0 % DO calibration.
Press CAL/MODIFY key to leave calibration after the first point. The
instrument will display “SAVING” message and it will return to measurement mode memorizing the
slope calibration data.
Zero Calibration
Press CAL/MODIFY key or continue with calibration after confirming the
first point. The meter will display “WAIT” and “0.0 %” will be displayed
in lower right corner. Submerse the probe membrane and temperature
sensor into the beaker containing HI7040 Zero Oxygen solution and stir
gently for 2‑3 minutes, the reading will go down.
When the reading is stable and stops decreasing, “CFM” tag starts
blinking. Press GLP/CFM key to confirm the 0.0 % DO calibration.
The instrument will display “SAVING” message and it will return
to measurement mode. Rinse probe tip off in water before taking
measurements in samples.
Calibrate the probe frequently, especially if high accuracy is required. The probe can be calibrated at
2 points: 100.0 % (slope calibration) and 0.0 % (zero calibration).
Initial Preparation
Prepare a fresh bottle of HI7040 by following package directions. Use solution within one month of
preparation. Pour small quantities of HI7040 Zero Oxygen solution into a beaker. If used, remove the
protective cap from the DO probe.
OPERATIONAL GUIDE
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