Hanna Instruments Marine Instruments Turbidity and Free/Total Chlorine Meter User Manual

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NORMAL MEASUREMENT
This type of measurement can be used for regular readings, when the sample is stable and normal
accuracy is required. In normal measurement mode, the lamp is ON for a minimum period of time
(about 7 seconds), saving the battery life. Normal measurement takes about 10 seconds.
If normal measurement is selected, the “AVG” tag will not be displayed.
CONTINUOUS MEASUREMENT
This measurement mode can be used when many measurements have to be taken in a short period
of time. The feature is also useful to evaluate a very fast settling sample. This measurement mode
is recommended for indexing cuvets. After the first reading is taken, the lid opening will not generate
any errors.
The first value is displayed after about 10 seconds and then a new reading is displayed each second.
In order to take a continuous measurement keep READ/TIMER
pressed until the desired number of
measurements are taken. The display will show blinking dashes and the icons for cuvet, detectors
and lamp will appear. When a new value is displayed, the cuvet icon and the measurement unit will
briefly blink.
The last value remains on the display after the READ/TIMER is released.
AVERAGED MEASUREMENT
Select this measurement mode when samples that cause unstable readings are analyzed. By averaging
several readings, the random noise generated by the sample is reduced and accurate measurements
can be taken.
This mode can also be selected when high accuracy measurements are desired. In the average mode
10 measurements are averaged in a short period of time (about 20 seconds). The initial value is
displayed after 10 seconds and the display is updated every second with an intermediate value.
• To select the averaged measurement mode,
press ZERO/AVG
.
When this mode is selected, the AVG icon will
be displayed on the LCD.
• Press READ/TIMER to start the measurement.
The display will show blinking dashes and the
icons for cuvet, detectors and lamp will appear
during measurement.
At the end of the measurement, the instrument
directly displays turbidity in NTU.

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