Hach-Lange ISENH318103 User Manual - Manual (Page 4)

6. Add a stir bar
and put the probe
in the first
standard solution
in the set. Do not
put the probe on
the bottom or
sides of the
container. 7. Put the beaker
on an
electromagnetic
stirrer and stir at a
moderate rate.
Check for air
bubbles and
remove them if
necessary. 8. Push Read.
The display will
highlight the
standard value
and proceed to
the next standard
value. The display
will show
"Stabilizing" and a
progress bar as
the reading
stabilizes. The
display shows the
standard value
when the reading
is stable. 9. Repeat steps
5-8 for the other
Ammonia
standard solutions
in the set. 10. Push Done to
view the
calibration
summary. The
display will not
show Done until
the minimum
number of
calibration points
have been
collected.
11. Push Store to
accept the
calibration and
return to the
measurement
mode.
Measurement—direct method
Before measurement:
The probe must have the correct service-life time stamp. Set the date and time in the meter before the probe is attached.
If complete traceability is required, enter a sample ID and operator ID before measurement. Refer to the HQd meter manual
for more information.
Make sure the Ammonia membrane module is assembled with the correct amount of Ammonia fill solution.
Regular calibration is required for the best measurement accuracy (refer to Calibration on page 2).
Prepare the probe for use (refer to Preparation for use on page 2).
Measurement notes:
• Stir the standards and samples at a slow and steady rate to prevent the formation of
a vortex.
• Stabilization times with smaller concentration changes generally will be longer and
can be minimized by proper stirring and conditioning. Experiment to determine the
proper stir rate if necessary.
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