53 Measurement
• Set Salinity value if measuring ocean or brackish water samples.
• Carefully lower the probe into sample so no trapped air bubbles at the Cap.
•
Routinely inspect the probe for biofouling. Routinely clean off the probe with clean water (between
measurements). Biologically active waters may require more frequent cleaning.
• Make sure the optical window / membrane is clean, without any coating, for good sample circulation.
11.2. MEASUREMENT TIPS
• Ensure probe is correctly plugged in.
• Only work with recently calibrated probes.
• Use the HI764060 holder for easy transfer in and out of containers during sample measurement.
•
To limit sample contamination, pour 2 beakers of sample. Use one beaker to rinse the sensor, and another
one for measurement.
Measuring with polarographic probe
` Place probe in sample and allow reading to stabilize.
` For accurate measurements the membrane needs constant oxygen replenishment. Ensure adequate
water movement either manually or by use of a stirrer.
11.3. DIRECT READINGS
From Measurement screen, tap
(Measurement Menu). Next:
• Tap Reading tab and select unit.
• Tap Direct to select direct Reading Mode.
• Place the probe into the sample to be measured.
Allow time for the reading to stabilize (Unstable status is indicated on the screen until measurement is
stabilized).
• The measured value is displayed on the LCD, together with GLP information and display preferences.
Last Calibration
% Sat
0.0
760.0 mmHg
25.5 °C
26/01/2023
14:14:22
% Sat
100.0
760.0 mmHg
25.5 °C
26/01/2023
14:14:45
0.0 % Sat
90.0%
Offset:
Avg. Slope:
26/01/2023
14:14:53
DO
ATC
°C
25.5
[A]
mmHg
760.0
ppm
8.74
Hanna_01
Stable
1%
Admin
14:17:32 26/01/2023
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