Thermo Fisher Scientific Eutech 2700 Series - Manual (Page 39)

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0% Calibration
7) After completing steps 1 thru 6 for 100% saturation calibration, place your
electrode in zero oxygen solution (0.08M sodium sulfite). Continuous stirring
is not required.
8) The primary reading is the current measured
value. Be patient—the reading can take
several minutes to reach 0% saturation!
9) When the reading has finally stabilized and
locked on 0% press ENTER to confirm the
calibration.
mg/L or ppm (Concentration) Calibration
1) Connect the DO electrode and power on DO 2700 for 5-15 minute warm up.
2) Press MODE if needed for concentration measurement mode.
3) Rinse the probe well with clean water then place into your solution with a
known dissolved oxygen concentration value (i.e. determined by titration or
another instrument).
4) Press CAL and switch the stirrer on. The upper reading is the current
measured value. The lower reading is the factory default reading for
comparison, along with salinity and temperature correction shown.
A manual DO concentration calibration
5) Allow the reading to stabilize. Use the up/down arrows to adjust the upper
reading to match the DO concentration of your solution. The minimum
concentration calibration value is 2.00 mg/L. Press ENTER to confirm the
calibration.