Nova-Tech pH-Dissolved Oxygen Meter - Manual (Page 9)

Dissolved Oxygen calibration in mg/l (ppm) mode
Calibrating the meter to 100 % in saturation mode will also calibrate the mg/l mode
at the value in mg/l corresponding to 100% saturation. This should produce
acceptable results in most applications.
This meter also lets you make a calibration adjustment in mg/l (ppm) mode
without affecting your % saturation calibration.
To select between mg/l and ppm units, see page 52.
17 16
To calibrate 0 % saturation:
1. Rinse the probe well with deionized
rinse water or rinse solution. Do not
touch the membrane.
2. Press the MODE key to select the
% saturation mode.
See figure
2. Place the probe in zero oxygen
solution. Stir the probe gently to
homogenize the sample. Make sure
that the sample is continuously flowing
past the membrane sensor.
3. Press the CAL key. The CAL indicator
will appear above the primary display.
The primary display shows the current
value of the measurement and the
secondary display will show 0.0.
See figure
4. Wait for the reading to stabilize. If the
Ready indicator feature is enabled, it
will appear when the reading is stable
(see page 43 for Ready indicator setup).
5. Press the ENTER key. The meter auto-
matically calibrates to 0.0% saturation
and returns to Measurement mode.
See figure
Notes
The reading in the primary display in step
3 must read at 10% or under for the calibra-
tion to work correctly. Whenever an error
occurs during calibration, the ERR indicator
appears in the lower left hand corner of the
display.
You can offset your % DO calibration: see
page 40 for directions.
ATC
READY
MEAS
%
C
READY
CAL
%
D
D
E E
ATC
READY
MEAS
%
C
F
F
To calibrate in mg/l (ppm) mode:
1. Calibrate 100% saturation per section 4.5
on page 15.
2. Rinse the probe well with deionized
rinse water or rinse solution. Wipe the
outside of the probe carefully (do not
touch the membrane).
3. Dip the probe into a sample of known
oxygen concentration. Wait for the
reading to stabilize. If the Ready
indicator feature is enabled, it will appear
when the reading is stable (see page 43
for Ready indicator setup).
NOTE: The sample must continuously flow
past the membrane for accurate
readings. A stirrer can keep the
solution agitated; order a magnetic
stirrer on page 65.
4. Press the MODE key to select the
mg/l (ppm) mode.
See figure
5. Press the CAL key. The CAL indicator
will appear above the primary display.
The primary display shows the current
value of the measurement and the sec-
ondary display shows the temperature.
See figure
6. Press the ▲ and ▼ keys to adjust
the reading.
7. Press the ENTER key. The meter
automatically calibrates to the
value you entered and returns
to Measurement mode.
See figure
4.6
ATC
READY
MEAS
C
mg/l
ATC
READY
CAL
C
mg/l
ATC
READY
CAL
C
mg/l
A
A
B
C
C
B
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