YSI 52 - Manual (Page 15)

SECTION 4 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 salinity setting is 0.0 ppt. You can enter any
salinity setting between 0.0 and 40.0 ppt. To do this, turn the function switch to
SALINITY. A display similar to the one below will show:
E n t e r s a l i n i t y
S e t t i n g = 0 . 0
Use ¿ and À to adjust the salinity setting. You might find it quicker to press SKIP first,
which will set the value to 35.0 ppt. The following display will be shown:
E n t e r s a l i n i t y
S e a w a t e r = 3 5 . 0
Pressing SKIP again will set the value to 0.0 ppt for fresh water measurements. The
following display will be shown:
E n t e r salinity
Fresh = 0. 0
Pressing SKIP once more will bring the setting to its original value. Once you have set
the salinity correctly, press CONFIRM. The instrument will ask you to wait, then show
you the new salinity setting.
If you have calibrated using the air saturation method, there is no need to recalibrate after
changing the salinity setting. If you have calibrated in mg/L, then you must recalibrate
after setting the salinity.
After calibrating in air or in air-saturated water, you may change the meter's salinity
setting without recalibrating. You may, for instance, calibrate only once and then proceed
to measure oxygen in a variety of samples at different salinity by simply setting the
proper salinity before making each measurement.
YSI, Incorporated Model 52 11