Hach-Lange ISENH318103 User Manual - Manual (Page 5)

• The integrated temperature sensor and HQd meter software do not compensate for
differences in temperature between calibration standards and samples. Measurement
stabilization is not dependent on temperature stabilization. Temperatures of
calibration standards and samples should be kept within ±2 °C of each other for
optimal results.
• Data is automatically stored in the data log when Press to Read or Interval is
selected in the Measurement Mode. When Continuous is selected, data will only be
stored when Store is selected.
• Between measurements, rinse the probe with deionized water. Blot dry with a lint-free
cloth. Do not touch the tip of the probe.
• Air bubbles under the sensor tip when submerged can cause slow response or error
in measurement. If bubbles are present, gently shake the probe until bubbles are
removed.
• If a measurement error occurs, refer to Troubleshooting on page 11.
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 Ammonia
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. 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. 7. Repeat steps
2 - 6 for additional
measurements. 8. When
measurements
are done, store
the probe (refer to
Storage
on page 10).
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