Hach BODTrak, Instrument Manual, Page: 20 / 63

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elapsed time and BOD value of the data point are shown in the
lower right of the display.
The cursor is automatically placed at the most recently collected
data point whenever a channel is displayed.
The
ON
Key
To start a test, follow the procedure in section 3.1 BODTrak Test
Procedure and proceed as follows:
1. Connect the tube cap for the measurement channel to the
bottle being tested, and firmly tighten the cap.
2. Simultaneously press and hold the < (left) and the > (right)
scroll keys. The time menu will appear. Press
CHANNEL 6
to
activate the test length parameter.
3. Use the scroll keys to choose a 5-, 7-, or 10-day test. The test
length is shown at the bottom of the screen.
4. Press the
OFF
key to save the selection and exit the menu.
5. Hold down the
ON
key. A menu for selecting a BOD scale is
displayed.
6. Press the < (left) or > (right) key to select the desired scale.
This also initializes the current channel, clears any previously
stored BOD data, and records the current time as the start
time. For details regarding scale selection, see section 3.1
BODTrak Test Procedure.
NOTE:
To leave the menu screen without starting a test, press the
OFF
key.
7. Press and hold the
ON
key to start a test. An empty graph for
the selected channel is displayed. The status annunciator in the
lower right of the display will show
DLY
for the first hour of
the test, during which no data are taken. This allows the
instrument, bottles, and sample to equilibrate to the incubation
temperature. After the first hour the annunciator shows
RUN
,
indicating that the channel is actively collecting data.
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