Thermo Fisher Scientific CyberScan DO 300 - Manual (Page 16)

Instruction Manual DO 300
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5.2 Taking Pressure/Salinity Compensated DO measurements
If necessary, you can adjust the pressure and salinity values of your measurements in the
SETUP mode. The DO meter will automatically compensate for salinity and pressure based on
the values entered in the SETUP functions. The meter is factory set at 760 mm Hg (101.3 kilo
Pascals) pressure adjustment and a factor of 0.0 ppt salinity adjustment. See Section 15 on
page 50 for a “Pressure vs Altitude” table.
Pressure Adjustment
1. Press the SETUP key to enter SETUP mode.
2. Press the MI/ key once. The upper display shows “dPr”.
3. Press the ENTER key until the upper display shows a number and the lower display
shows “Hg” or “PA”.
4. Use the MI/ and MR/ keys to enter the barometric pressure. The upper display will
show the value you have entered.
5. Press ENTER to confirm pressure value.
6. Press CAL/MEAS to return to Measurement mode, or continue with step 5 on page 23 to
make a salinity adjustment [available from mg/L (ppm) SETUP mode only].
7. See Figure 18 on page 22.
Salinity Adjustment
NOTE: This mode appears in mg/L (or ppm) SETUP mode only.
1. Press the MODE key to select mg/L (ppm) mode.
2. Press the SETUP key to enter SETUP mode.
3. Press the MI/ key once. The upper display shows “dPr”.
4. Press the ENTER key until the upper display shows a number and the lower display
shows “SAL”.
5. Use the MI/ or MR/ keys to enter the salinity of your solution in ppt. The upper
display will show the value you have entered. Salinity correction values from 0.0 to 50.0
ppt can be entered.
6. Press ENTER key to confirm value.
7. Press CAL/MEAS to return to Measurement mode.
8. See Figure 19 on page 23.