LaMotte DO 6 Dissolved Oxygen Meter - Manual (Page 20)

5. Press the CAL key. The display will show a value which is with
respect to the factory default calibration with a CAL indicator
blinking at the corner of the display.
6. Press the
p andq keys to adjust the reading to the known oxygen
concentration of the sample.
7. Press the HOLD/ENTER key to confirm the calibration. The meter
will display “CO” for 1.5 seconds and automatically calibrates to the
value you have entered and returns to the measurement mode.
NOTES: The concentration calibration window is +/- 40% of the factory
default value. However, the minimum point of calibration is 2 mg/L. In
an event where the default measured value is less than 2 mg/L and a
calibration is attempted, the display will show “2.00” and then error
message “Err.1” will be displayed momentarily before returning to
measurement mode.
You can change the barometric pressure value and salinity value in the
mg/L (ppm) Set Up menu (see Section and for and ). Please refer to
page if you are intending to use manual temperature compensation.
5 MEASUREMENT
The DO 6 meter is capable of taking measurements with automatic or
manual temperature compensation.
5.1 With Automatic Temperature Compensation (ATC)
For Automatic temperature compensation, make sure the phono jack of
the probe (see Figure 6 in Section 3.5) is securely inserted. The ATC
annunciator “A” will be blinking if the ATC probe is disconnected.
Activate the “A.ATC” mode in the set up menu, if necessary. See page
36.
19
83.0
%
A
Automatic Temperature
Compensation activated
Figure 8: Automatic Temperature Compensation