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instrument could occur if not observed. A symbol on the instrument is referenced in the
manual with a precautionary statement.
Electrical equipment marked with this symbol may not be disposed of in European public disposal systems after
12 August of 2005. In conformity with European local and national regulations (EU Directive 2002/96/EC), European
electrical equipment users must now return old or end-of-life equipment to the Producer for disposal at no charge to
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Specifications
Note: Specifications are subject to change without notice.
SpecificationsDetails
DOC022.52
.80107
Probe typeDigital combination gas-sensing probe with a refillable outer body, double-
junction reference and a built-in temperature sensor
Range0.01 mg/L (5x10-7 M) to 14,000 mg/L (1 M) as NH3-N
Sample pH range> pH 11 per Ammonia ISA
Linear region0.5 mg/L to 14,000 mg/L as NH3-N
Slope57 mV/decade (90 to 110% in linear range at 25 °C (77 °F) per Nernstian
theoretical value)
Operating temperature range5 to 50 °C (41 to 122 °F)
Storage temperature range5 to 35 °C (41 to 95 °F)
JunctionDouble junction (annular)
Reference typeAg/AgCl
Fill solution3 M KCl gel (non-refillable), 0.1 M NH4Cl (outer body, refillable)
Response time in linear region< 60 seconds (application dependent)
Minimum sample volume15 mL
Minimum immersion depth25.4 mm (1 in.)
DimensionsDiameter: 12 mm (0.47 in.)
Length: 175 mm (6.89 in.)
Cable length: 1 or 3 m (3.28 or 9.84 ft)
Cable connectionM12 digital output and connector compatible with HQd meters
Product overview
The ISENH318101 or ISENH318103 probe is a digital combination gas-sensing electrode
with a refillable outer body, double-junction reference and built-in temperature sensor
(Figure 1). The probe is available with a 1 or 3 m (3.28 or 9.84 ft) cable and is intended
for laboratory use. The probe measures ammonia concentration in water samples.
1
Figure 1 Probe overview
1 Soaker bottle5 1 or 3 m (3.28 or 9.84 ft) cable
2 Membrane module protector cap (3x)6 Fill solution bottle
3 Membrane module (3x)7 Soaker bottle lid
4 Probe body8 Glass bulb with integrated temperature sensor
Preparation for use
Prepare the probe for use before calibration or sample measurement.
1. Twist and remove the soaker bottle from the lid to release the pressure.
2. Remove the soaker bottle lid from the probe.
3. Rinse the probe with deionized water. Blot dry with a lint-free cloth. Do not touch the
tip of the probe.
4. Get a single membrane module from the shipping package. Do not touch the
membrane surface.
5. Add 12 drops (0.5 mL) of the Ammonia probe filling solution in the membrane
module.
6. Install the membrane module on the probe and tighten. Do not spill the filling solution.
Calibration
Before calibration:
The probe must have the correct service-life time stamp. Set the date and time in the meter before the probe is attached.
It is not necessary to recalibrate when moving a calibrated probe from one HQd meter to another if the additional meter is
configured to use the same calibration options.
Default calibration standard set for ISENH3181 probe requires 1, 10 and 100 mg/L Ammonia standard solutions. A new
method can be made if custom calibration or measurement settings are needed. Refer to Advanced operation on page 7
for a list of additional calibration sets.
To view the current calibration, push , select View Probe Data, then select View Current Calibration.
If any two probes are connected, push the UP or DOWN arrow to change to the single display mode in order to show the
Calibrate option.
Make sure the Ammonia membrane module is assembled with the correct amount of Ammonia fill solution.
Prepare the probe for use (refer to Preparation for use on page 2
).
2
Calibration notes:
Stir the standards and samples at a slow and steady rate to prevent the formation of
•
a vortex.
•Additional standard sets along with the minimum number of calibration points can be
selected on the Calibration Options menu.
•Push Skip to omit a standard from the calibration routine. The display will not show
Skip until the minimum number of standards is met.
•Begin with the lowest concentration during calibration. This reduces carry-over
contamination to give the best results.
•Note the temperatures of the standards during calibration. Keep temperatures
between calibration standards within ±2 ºC for optimal results.
•The calibration is recorded in the electrode and the data log. The calibration is also
sent to a PC, printer or flash memory stick if connected.
•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 calibration error occurs, refer to Troubleshooting on page 11.
Calibration 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. In three
separate beakers
or appropriate
containers,
prepare Ammonia
standard solutions
(minimum 25 mL
volume).
3. Add the
contents of one
Ammonia ionic
strength
adjustment (ISA)
powder pillow per
25 mL to each
standard.
4. Push
Calibrate. The
display shows the
current standard
value that is to be
read from the
standard solution
set.
5. Rinse the
probe with
deionized water.
Blot dry with a lintfree cloth. Do not
touch the tip of the
probe.
3
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.
11. Push Store to
accept the
calibration and
return to the
measurement
mode.
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.
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.
4
).
•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.
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.
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.
7. Repeat steps
2 - 6 for additional
measurements.
3. Rinse the
probe with
deionized water.
Blot dry with a lintfree cloth. Do not
touch the tip of the
probe.
8. When
measurements
are done, store
the probe (refer to
Storage
on page
10).
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.
5
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