YEO-KAL 615, Руководство пользователя, Страница: 16 / 48

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The Reader Unit can be turned off without losing any of the instrument settings. If the
logger is activated, the unit will continue to record measurements even if the Reader
Unit is turned off.
Adjust Contrast (1)
When the instrument is used in the field, variations in ambient light and temperature
may make the display difficult to read. This can be remedied by adjusting the display
contrast.
To make this adjustment, go to main menu. Use the arrow keys to until the message 1)
ADJ CONTRAST appears then press ENTER. Now press the up or down
arrow keys until
the display is easier to read then press ENTER or ESC to return to the main menu.
Altitude and Salinity Corrections (2)
The solubility of oxygen in water is less in brackish or sea water than in fresh water and
also decreases with increasing altitude. For dissolved oxygen concentration
measurements to be accurate, they must be compensated for the salinity of the water
being tested and for the atmospheric pressure. The YK615 will calculate the correct
value of dissolved oxygen concentration and percent saturation once you have entered
the altitude for the particular sample being tested, salinity corrections are made
automatically.
1. With the instrument deployed, select 1) ALT CORRECTION from the main menu
and press
ENTER .
2. Press the number keys until the display shows the correct altitude in meters.
Press ENTER . The altitude which you have entered will remain until it is
changed, even if you turn the instrument off.
Using the Reader Unit Memory
Store Data Out (3)
The Reader Unit has two separate memories: the store memory and the logger memory.
The logger memory can hold up to 2135 readings and the store memory can hold up to
600 readings. Once stored, the data can then be down loaded into a computer via the
YEO-KAL software or printed at a later date.
The store memory is used to hold spot measurements. To store a reading while in the
field simply press the
STORE key. The data will be down loaded in the order in which it is
stored so keep a record of the site at which each measurement was made so that the
data can be easily analyzed. The operator will be asked to connect the serial data cable
to the PC. Press ENTER and the operator will asked to either down load :
All data, by date, by tag, after making selection press ENTER to proceed or ESC to go
back.
ALL data press ENTER the operator will be asked they require calibration constants
included with the data. This function is useful for quality assurance procedures.