Hach-Lange ISENO318103 User Manual

User Manual

Nitrate Probe: Model ISENO318101 or ISENO318103

Safety information

Precautionary labels

Read all labels and tags attached to the instrument. Personal injury or damage to the
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
the user.

Note: For return for recycling, please contact the equipment producer or supplier for instructions on how to return end-of-life
equipment, producer-supplied electrical accessories, and all auxiliary items for proper disposal.

Specifications

Note: Specifications are subject to change without notice.

Specifications Details

DOC022.52

.80031

Probe type Digital combination probe with a non-refillable reference junction and a built-in temperature

sensor

Range 0.1 mg/L (7x10-6 M) to 14,000 mg/L (1 M) Nitrate Nitrogen

Sample pH range pH 2 to 11, must be adjusted to 3 to 5 by Nitrate ISA

Linear region 0.7 mg/L to 14,000 mg/L Nitrate Nitrogen

Slope 58 mV/decade (90 to 110% at 25 °C (77 °F) in linear range per Nernstian theoretical value)

Operating temperature range 0 to 50 °C (32 to 122 °F)

Storage temperature range 5 to 35 °C (41 to 95 °F)

Junction Double junction (ceramic porous pin and annular porous Teflon®)

Reference type Ag/AgCl

Fill solution driTEK Gel (non-refillable)

Response time in linear region < 60 seconds (application dependent)

Minimum sample volume 25 mL

Minimum immersion depth 25.4 mm (1 in.)

Dimensions Diameter: 12 mm (0.47 in.)

Length: 175 mm (6.89 in.)

Cable length: 1 or 3 m (3.28 or 9.84 ft)

Cable connection M12 digital output and connector compatible with HQd meters

Product overview

The ISENO318101 or ISENO318103 probe is a combination
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 nitrate concentration in
water samples.

nitrate probe with a built-in

1

Figure 1 Probe overview

1 Sensor protection cap 3 Sensing element

2 Reference junction 4 1 or 3 m (3.28 or 9.84 ft) cable

Preparation for use

Prepare the probe for use before calibration or sample measurement.

1. Remove the sensor protection cap from the probe.

2. Rinse the probe with deionized water. Blot dry with a lint-free cloth. Do not touch the

tip of the probe.

Note: Prior to use, the probe must be conditioned for at least five minutes in 25 mL of the
lowest concentration standard solution in the calibration set.
If probe stabilization is slow after storage, condition the probe for up to one hour in 25 mL of
the lowest concentration standard solution in the calibration set.

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 ISENO3181 probe requires 1, 10 and 100 mg/L Nitrate as Nitrogen standard solutions. A
new method can be made if custom calibration or measurement settings are needed. Refer to Advanced operation
on page

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.

Prepare the probe for use (refer to Preparation for use on page 2).

7 for a list of additional calibration sets.

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.

2

• 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 10.

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.

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.

2. In three
separate beakers
or appropriate
containers,
prepare Nitrate
Nitrogen standard
solutions
(minimum 25 mL
volume).

7. Put the beaker
on an
electromagnetic
stirrer and stir at a
moderate rate.
Check for air
bubbles and
remove them if
necessary.

3. Add the
contents of one
Nitrate ionic
strength
adjustment (ISA)
powder pillow per
25 mL to each
standard.

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.

4. Push
Calibrate. The

display shows the
current standard
value that is to be
read from the
standard solution
set.

9. Repeat steps
5-8 for the other
Nitrate standard
solutions in the
set.

5. Rinse the
probe with
deionized water.
Blot dry with a lint­free cloth. Do not
touch the tip of the
probe.

10. Push Done to
view the
calibration
summary. The
display will not
show Done until
the minimum
number of
calibration points
have been
collected.

3

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.

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.

• Note the temperatures of the samples during measurement. 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 10.

Measurement procedure:

4

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 lint­free 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.

Low-level measurements

Use the following techniques for measurements at low concentrations

• 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:

8. When
measurements
are done, store
the probe (refer to

Storage

on page

10).

(<1 mg/L NO

3

–

–N).

5