Thermo Fisher Scientific CyberScan DO 300 - Manual (Page 13)

Instruction Manual DO 300
10
4.4 Dissolved Oxygen Calibration in mg/L (ppm) mode
Calibrating the meter to 100% in saturation mode will also calibrate the mg/L mode at the
value in mg/L corresponding to 100% saturation. This should produce acceptable results in
most applications.
This meter also lets you make a calibration adjustment in mg/L (ppm) mode without affecting
your % saturation calibration.
To select between mg/L and ppm units, see page 30.
To calibrate in mg/L (ppm) mode:
1. Calibrate 100% saturation as per Section 4.3.
2. Rinse the probe well with DI rinse water or rinse solution.
For best accuracy, wipe the end of the probe dry. Do not
touch the membrane.
3. Press the MODE key to select the mg/L (ppm) mode.
4. Dip the probe into a sample of known oxygen concentration.
Wait for the reading to stabilise. If the READY indicator
feature is enabled, it will appear when the reading is stable.
5. Press the CAL key. The CAL indicator will appear above the
primary display. The primary display will show the factory
default mg/L (ppm) measurement and the secondary
display shows the temperature.
6. Press the MI/ or MR/ keys to set the reading according
to the sample value.
7. Press the ENTER key. The meter automatically calibrates to
the value you entered and returns to Measurement mode.
Notes on mg/L (ppm) mode calibration
• During mg/L (ppm) measurement and calibration, the
meter adjusts to the barometric pressure value and the
salinity value that is programmed into the meter
• You can change the barometric pressure value and
salinity value in the mg/L (ppm) SETUP mode (see
section 8.3 on page 21 for directions).
•
Whenever an error occurs during calibration, the ERR
indicator appears in the lower left hand corner of the
display.
Figure 8: To calibrate in
mg/L (ppm) mode
(The values shown above
are for illustration purpose.
Your meter may display
different values depending
on the settings & your
environmental conditions)