Thermo Fisher Scientific CyberScan DO 600 - Manual (Page 117)

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2. DO Calibration in mg/L mode or ppm
Concentration mode
The amount of oxygen dissolved in a liquid will depend on its temperature,
atmospheric pressure and salinity. It is therefore very important to set
temperature and salinity correctly before attempting to do a calibration. The
meter is capable of measuring barometric pressure with its built-in pressure
sensor. In the event, the pressure reading is inaccurate, you can calibrate the
value from the Setup menu.
1. Switch the meter on. Make sure the meter is in concentration
measurement mode.
2. Rinse the probe well with de-ionized rinse water. For best accuracy,
blot the end of the probe to dry it. Do not touch the membrane. Dip
the probe into a solution with a known DO value.
3. Press CAL (F2) to go to calibration mode.
4. The meter shows ‘Dissolved O
2
Calibration-Rinse Electrode’ screen
for a few seconds to prompt user to rinse electrode with de-ionized
water before calibration.
Figure 58 : Concentration Calibration Screens
5. The meter then shows the concentration calibration screen.
6. The upper display of the calibration screen will show the current
value of the measurement and the secondary display will show the
value to which the meter is going to be calibrated. Press &
keys to adjust the reading to the known oxygen concentration of the
sample.
Note: If the meter is password protected, you will be prompted to enter a
password.