Hach-Lange ISENO318103 User Manual - Manual (Page 5)

1. Connect the
probe to the
meter. Make sure
that the cable
locking nut is
securely
connected to the
meter. Turn the
meter on. 2. Prepare a
minimum of 25 mL
of the sample(s) in
beakers or
appropriate
containers. Add
the contents of
one Nitrate ionic
strength
adjustment (ISA)
powder pillow per
25 mL to each
sample. 3. Rinse the
probe with
deionized water.
Blot dry with a lint-
free cloth. Do not
touch the tip of the
probe. 4. Add a stir bar
and put the probe
in the sample.
Make sure that the
temperature
sensor is fully
immersed in the
solution. Do not
put the probe on
the bottom or
sides of the
container. 5. Put the beaker
on an
electromagnetic
stirrer and stir at a
moderate rate.
Check for air
bubbles and
remove them if
necessary.
6. Push Read.
The display will
show "Stabilizing"
and a progress
bar as the probe
stabilizes in the
sample. The
display will show
the lock icon when
the reading
stabilizes. If
required by the
application, also
record the sample
pH and
temperature. 7. Repeat steps 2
- 6 for additional
measurements. 8. When
measurements
are done, store
the probe (refer to
Storage
on page 10).
Low-level measurements
Use the following techniques for measurements at low concentrations (<1 mg/L NO
3
– –N).
• Clean the probe regularly as specified in Maintenance on page 10.
• Soak the probe in the lowest concentration standard solution for up to 1 hour before
calibration and measurement.
• Set the stability criteria to a low value (refer to Change measurement options
on page 7).
• Stir the standards and samples at a slow and steady rate to prevent the formation of
a vortex.
• Use a dilute ionic strength adjustor (ISA) solution for calibration and measurements:
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