Mg/L Or Ppm Calibration - EUTECH INSTRUMENTS DO 6 PLUS Instruction Manual

Instruction Manual
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
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.
calibrations, the calibration is limited to ±40% adjustment of the factory default
value.
(ppm) calibration isn't
CAL
CAL
- 13 -
CAL
A value with respect to the
factory default calibration
will be displayed
HOLD
ENTER
"CO" will display
for 1.5 seconds
To prevent erroneous
DO 6+
A
mg/l
mg/l
mg/l
A
mg/l