37
I
A180/181
Measurements
Dissolved Oxygen Measurement
The A series meter can be used to measure the water, wastewater,
brine and other liquids. If your sample is seawater or water containing
large amounts of salt, make sure to set the salinity coefficient before
measurement. Some gas and steam such as chloride, sulfur dioxide,
sulfureted hydrogen and carbon dioxide can permeate the membrane
via diffusion. Their existence will influence the measurements. If the
sample contains the solvent, grease, sulfide and alga, the membrane
will be damaged or eroded.
1.1 Set the barometric pressure and salinity coefficient in the setup
menu.
1.2 Rinse the dissolved oxygen electrode with distilled water. Place
the electrode into the sample solution and stir gently. Wait for the
measurement to stabilize and record the reading.
1.3 If the Auto-Read option in the setup menu is enabled, the meter
will automatically sense a stable reading and lock measurement,
the Hold icon appears on the screen. Press the key to resume
measuring.
If the option is disabled, the meter will continuously measure and
update the readings.
To record the measurement at the predefined time intervals, refer to
the
Interval Readings
section on page 42.
BOD Measurement
The A180 meter contains a BOD measurement mode. A typical process
for BOD determination consists of 4 steps: sample preparation, initial
measurement, incubation, final measurement.
2.1 Press the
Mode
key and the
key to select the
BOD
.
2.2 Press the
Enter
key, the screen shows "Do you want to measure
a blank solution?".
2.3 Press the
Enter
key to take a measurement or the ESC key to
skip this step.
2.4 Place the dissolved oxygen electrode into the blank solution.
Wait
for the reading to stabilize, press the
MI
key to store the measured
value.
2.5 The meter will automatically show a parameter list and waits
for entering the initial blank concentration, initial sample
concentration, total volume and sample volume.
