CALIBRATION
21
9. CALIBRATION
Ensure the probe is ready for measurements. Follow the procedure
in PROBE PREPARATION section.
Set the appropriate altitude and salinity compensation value (see
SETUP OPTIONS section).
For highest accuracy, complete all calibrations at a temperature
as close as possible to the sample temperature.
MW605
accepts two % saturation calibration points; 100% using
saturated air and 0% using zero oxygen solution.
For most applications, air calibration is sufficient.
The meter should be recalibrated:
y
Whenever the probe is replaced
y
When high accuracy is required
y
If “CAL EXPIRED” or “NO CAL” is displayed
y
At least once a week
100% Calibration
The 100% calibration is performed in water-saturated air.
1. Pour water into a small beaker. Hold the probe in air over the
beaker. Avoid any contact of the membrane with the water.
2. Press CAL/EDIT to enter calibration.
LCD displays 100.0% with “WAIT” (blinking) and hourglass
symbol until the reading is stable.
When the reading is stable and within the limits, LCD displays
“STD” with ACCEPT tag (blinking).
3. Press GLP/ACCEPT to confirm.
LCD displays “0.0%” calibration point and “WAIT” (blinking).
4. Press CAL/EDIT. LCD displays “SAVING”, stores the calibration
value and returns to Measurement mode.
