Hach-Lange ISENa38103 - Manual (Page 6)

Measurement procedure:
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 Sodium ionic
strength
adjustment (ISA)
powder pillow per
25 mL to each
sample. 3. Rinse the
probe with ISA
rinse solution
(refer to
Prepare
the ISA rinse
solution
on page 11).
Never use
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
reference
junctions are fully
immersed in the
solution. Do not
put the probe on
the bottom or
sides of the
container. Shake
the probe from
side to side in the
sample to refresh
the reference
junction. 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. 7. Repeat steps
2 - 6 for additional
measurements. 8. When
measurements
are done, store
the probe (refer to
Storage
on page 12).
Run a check standard
The run check standard feature validates instrument performance between sample
measurements. Use the run check standard feature for periodic or user-defined interval
measurements of a traceable standard solution. Set the criteria for check standards from
the ISENa381 Settings menu.
Note: Access control must be off or a valid password must be entered before any of the check
standard method options can be changed.
1. Push . The Full Access Options menu is shown.
2. Select Run Check Standard.
Note: Select the correct probe if two probes are connected to the meter.
3. Prepare the standard solution shown on the display. Add one powder pillow per
25 mL of standard solution.
6