EUTECH INSTRUMENTS DO 6 PLUS Manual de Instruções Página 19

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Instruction Manual DO 6+
- 13 -
3.4 mg/L or ppm Calibration
Performing a 100% saturation calibration will
simultaneously calibrate the corresponding
mg/L (ppm) concentration value. Therefore,
additional mg/L (ppm) calibration isn’t
required in most circumstances.
If desired, you can perform a calibration
adjustment in mg/L (ppm) without affecting
your % saturation calibration value.
1) Perform 100% saturation calibration.
See Section 3.3.1 — 100% Calibration.
2) Rinse the probe well with DI water or
rinse solution.
3) Dip the probe into a sample of known
oxygen concentration (i.e. determined
by titration or another instrument). Wait
for the reading to stabilize.
4) Press MODE to select the mg/L (ppm).
5) Press CAL. The CAL indicator and
current concentration display briefly,
before CAL flashes. The concentration
value based on the factory default
calibration is shown.
6) Press to adjust the reading to
match the known oxygen concentration
value.
7) Press HOLD/ENTER to confirm the
calibration. The meter displays “CO”, automatically calibrates to the
entered value, then returns to measurement mode.
NOTE: The minimum calibration value is 2 mg/L. To prevent erroneous
calibrations, the calibration is limited to ±40% adjustment of the factory default
value.
mg/l
mg/l
mg/l
CAL
CAL
HOLD
ENTER
CAL
mg/l
“CO” will display
for 1.5 seconds
A
A
A
value with respect to the
factory default calibration
will be displayed
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