YSI Incorporated
Model 5000/5100 Service Manual
13
5.2 BAROMETER
The YSI Model 5100 has an internal barometer for pressure compensation during AUTO
Dissolved Oxygen Calibration. This barometer only needs to be calibrated when it is no longer
reading the correct barometric pressure. If the 5100 is kept at a constant ambient temperature
(
±
10°C), the barometer calibration should be accurate for about 30 days.
The Model 5000 does not contain a barometer, therefore, the current barometric pressure must be
entered before an AUTO Cal is performed. The reading currently displayed is the value that was
entered and stored during the previous calibration.
From the calibration menu press the [DO CAL] soft-key, then press the [NEXT] soft-key until
the barometric pressure is flashing and “Barometer” appears in the top right corner of the display
as follows:
98.0
*
% 8.15
mg/L
Barometer
0.0
ppt
740
mmHg
24.38°C 11:33
AM
Press ENTER to SAVE SETTING
UP
DOWN
DIGIT
NEXT
Using the [UP], [DOWN] and [DIGIT] soft-keys, enter the true local barometric pressure. This
corresponds to a reading from a mercury barometer. Do
NOT
use the pressure reported by the
weather bureau which has been corrected to sea level.
Press [ENTER] to confirm. The message
“PRESSURE CALIBRATION SAVED”
will be displayed.
5.3 SALINITY
Salt reduces the ability of water to hold oxygen in solution. Enter the salinity of the sample you are
measuring and the meter will automatically compensate for the effect of salinity on dissolved
oxygen. The default setting for salinity is 0.0 ppt. You can enter any value between 0.0 and 40.0 ppt.
From the Calibration menu press the [DO CAL] soft-key, then press the [NEXT] soft-key until
the salinity value is flashing. The top right corner of the screen will display “Salinity” as shown
in the following screen. Remember, if you are manually calibrating in mg/L in water saturated
air, salinity is 0.0 ppt.
98.0
*
% 8.15
mg/L
Salinity
0.0
ppt
740
mmHg
24.55°C 11:35
AM
Press ENTER to SAVE SETTING
UP
DOWN
DIGIT
NEXT
Using the [UP], [DOWN] and [DIGIT] soft-keys, enter the salinity value.
Press [ENTER] to confirm. The message “SALINITY SETTING SAVED” will be displayed.
Flashing digit
Flashing digit
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