Hach ISENH4181 Bedienungsanleitung

DOC022.53.80029

ISENH4181

05/2021, Edition 5

User Manual

Table of Contents

Section 1 Product overview................................................................................. 3

Section 2 Specifications ...................................................................................... 3

Section 3 Safety information............................................................................... 4

3.1 Intended use ....................................................................................................... 4

3.2 Use of hazard information..................................................................................... 4

3.3 Precautionary labels............................................................................................. 5

3.4 Product hazards.................................................................................................... 5

Section 4 Preparation for use.............................................................................. 5

Section 5 Calibration............................................................................................... 5

5.1 Calibration notes ................................................................................................. 5

5.2 Calibration procedure........................................................................................... 6

Section 6 Sample measurement....................................................................... 7

6.1 Sample measurement notes ............................................................................... 7

6.2 Sample measurement procedure......................................................................... 7

6.3 Low-level measurements...................................................................................... 8

6.4 Interferences ....................................................................................................... 8

Section 7 Verify the calibration.......................................................................... 9

7.1 Verification procedure........................................................................................... 9

Section 8 Maintenance........................................................................................ 10

8.1 Clean the probe.................................................................................................. 10

8.2 Storage............................................................................................................... 10

Section 9 Troubleshooting ............................................................................... 10

9.1 Slope check........................................................................................................ 11

9.2 Standard additions check................................................................................... 11

Section 10 Consumables..................................................................................... 12

10.1 Accessories...................................................................................................... 13

Table of Contents

Section 1 Product overview

The Intellical ISENH4181 series probes are digital, combination ion-selective electrodes (ISE) that

measure the concentration of ammonium in water samples. The Ammonium Ionic Strength Adjuster

(ISA) does not adjust the pH of the sample. Thus, the probes measure the ammonium ion (NH4+) but

not unionized ammonia (NH3). The probes have a built-in temperature sensor, a non-refillable gel

reference and non-replaceable membranes. Refer to Figure 1.

Figure 1 Probe overview

1 Sensing element 3 Sensor protection cap

2 Reference junction 4 Cable

Section 2 Specifications

Specifications are subject to change without notice.

Specifications Details

Probe type Digital combination probe with a non-refillable reference junction

and a built-in temperature sensor

Measurement range 0.018 mg/L (10–6 M) to 9,000 mg/L (0.5 M) as ammonium

(NH4+–N)

Accuracy ±0.02 mV or 0.05% (the larger value)

Sample pH range pH 0 to 8.5

Reference type Ag/AgCl

Reference junction Double junction (ceramic porous pin and annular porous PTFE)

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

Nernstian theoretical value)

Linear region 0.9 mg/L to 9,000 mg/L as ammonium

Temperature accuracy ±0.3 °C (±0.54 °F)

Temperature sensor type 30 kΩ NTC thermistor

Operating temperature 5 to 50 °C (41 to 122 °F)

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

English 3

Specifications Details

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

Minimum sample volume 25 mL

Minimum immersion depth 25.4 mm (1 in.)

Body material (standard) Epoxy

Membrane Solid-state PVC membrane

Reference electrolyte Non-refillable Dritek gel reference element

Cable connection M12 digital output and connector

Dimensions Diameter: 12 mm (0.47 in.)

Length: 175 mm (6.9 in.) total; 103 mm (4.1 in.) below head

Cable length: ISENH418101: 1 m (3.3 ft); ISENH418103: 3 m

(9.8 ft)

Warranty 1 year on the probe. This warranty covers manufacturing defects,

but not improper use or wear.

Certifications CE, FCC/ISED

Section 3 Safety information

3.1 Intended use

The Intellical probes are intended for use by individuals who measure water quality parameters in the

laboratory. The Intellical probes do not treat or alter water.

3.2 Use of hazard information

D A N G E R

Indicates a potentially or imminently hazardous situation which, if not avoided, will result in death or

serious injury.

WARNING

Indicates a potentially or imminently hazardous situation which, if not avoided, could result in death

or serious injury.

CAUTION

Indicates a potentially hazardous situation that may result in minor or moderate injury.

N O T I C E

Indicates a situation which, if not avoided, may cause damage to the instrument. Information that

requires special emphasis.

4 English

3.3 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

domestic or public disposal systems. Return old or end-of-life equipment to the

manufacturer for disposal at no charge to the user.

3.4 Product hazards

CAUTION

Chemical exposure hazard. Obey laboratory safety procedures and wear all of the

personal protective equipment appropriate to the chemicals that are handled. Refer to

the current safety data sheets (MSDS/SDS) for safety protocols.

CAUTION

Chemical exposure hazard. Dispose of chemicals and wastes in accordance with local,

regional and national regulations.

Section 4 Preparation for use

Prepare the probe for calibration and measurement as follows.

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 wipe the tip of the

probe.

3. Condition the probe before use. To condition the probe, soak the probe in approximately 25 mL of

the lowest concentration standard solution used for calibration for 30 to 60 minutes. Do not add

the ISA to the standard solution.

Note: Condition the probe each day for 15 to 30 minutes or for 30 to 60 minutes after long-term storage.

4. Make sure that the meter has the correct date and time settings. The service-life time stamp in

the probe comes from the date and time settings in the meter.

Note: Some meters automatically open the date and time settings when the meter starts for the first time, or

after battery replacement.

5. Connect the probe to the meter.

Section 5 Calibration

The procedure that follows is applicable to meters that can connect to Intellical ISE probes. Refer to

the applicable meter documentation for meter operation and probe-specific settings.

5.1 Calibration notes

Read the notes that follow before calibration.

• Measure the standard solutions from lowest to highest concentration for best results.

• Keep all of the solutions (standard solutions and samples) at the same temperature (± 2 °C

(± 3.6 °F)) for best results.

• Stir the standards and samples at a slow and constant rate to prevent the formation of a vortex.

• Use the default calibration options or change the options in the probe settings menu.

English 5

• Use the single display mode for calibration when more than one probe is connected to the meter (if

applicable).

• Calibrate the probes and verify the calibration regularly for best results. Use the meter to set

calibration reminders.

• The calibration data is stored in the probe. When a calibrated probe is connected to a different

meter with the same calibration options, a new calibration is not necessary.

• Air bubbles below the sensor when in solution can cause a slow response or error in the

calibration. Make sure to remove air bubbles during calibration.

5.2 Calibration procedure

1. Go to the

calibrate menu.

Select the probe, if

applicable. The

display shows the

standard solutions to

use for calibration.

2. Add 25 mL of

each standard

solution to different

beakers.

3. Add one

Ammonium Ionic

Strength Adjustor

(ISA) Solution Pillow

to each 25 mL of

standard solution.

4. Add a stir bar to

the first standard

solution. Put the

standard solution on

an electromagnetic

stirrer. Stir at a

moderate rate.

5. Rinse the probe

with deionized water.

Dry the probe with a

lint-free cloth.

6. Put the probe in

the standard solution

with the sensor fully

submerged. Do not

put the probe on the

bottom or sides of

the beaker.

7. Shake the probe

from side to side to

remove air bubbles.

8. Stir for 30 to

60 seconds, then

read the ammonium

concentration of the

standard solution.

6 English

9. Do steps 3

through 8 to read the

value of the

remaining standard

solutions.

10. Save the

calibration.

Section 6 Sample measurement

The procedure that follows is applicable to meters that can connect to Intellical ISE probes. Refer to

the applicable meter documentation for meter operation and probe-specific settings.

6.1 Sample measurement notes

Read the notes that follow before sample measurements.

• Rinse the probe with deionized water and dry with a lint-free cloth between measurements to

prevent contamination.

• If the stabilization time is long, try a different stir rate and make sure to condition the probe.

• Keep all of the solutions (standard solutions and samples) at the same temperature (± 2 °C

(± 3.6 °F)) for best results.

• If complete traceability is necessary, enter a sample ID and operator ID before measurement.

Refer to the meter manual for instructions.

• Stir the standards and samples at a slow and constant rate to prevent the formation of a vortex.

• The meter automatically saves the measurement data when the user manually reads each data

point and when the meter is set to read at regular intervals. The user must manually save each

data point when the meter is set to read continuously.

• Air bubbles below the sensor can cause a slow response or error in the measurement. Make sure

to remove air bubbles before and during measurements.

6.2 Sample measurement procedure

1. Pour 25 mL of

fresh sample into a

50‑mL beaker.

2. Add one

Ammonium Ionic

Strength Adjustor

(ISA) Solution Pillow.

3. Add a stir bar.

Put the beaker on an

electromagnetic

stirrer. Stir at a

moderate rate.

4. Rinse the probe

with deionized water.

Dry the probe with a

lint-free cloth.

English 7

5. Put the probe in

the sample with the

sensor fully in the

sample. Do not put

the probe on the

bottom or sides of

the beaker.

6. Shake the probe

from side to side to

refresh the reference

junction and remove

air bubbles.

7. Stir for 30 to

60 seconds, then

read the ammonium

concentration of the

sample. The display

shows the value

when the reading is

stable.

6.3 Low-level measurements

Use the guidelines that follow for measurements at low concentrations (<1 mg/L NH4+–N).

• Fully rinse the probe with deionized water and blot dry between measurements.

• Soak the probe in the lowest concentration standard solution for 1 hour maximum before

calibration and measurement.

• Use the meter to set the stability criteria for the probe to a low value.

• 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:

1. Dissolve the contents of one ionic strength adjustor powder pillow in 50 mL of deionized water.

2. Add 5 mL of the dilute (ISA) solution to each 25 mL of standard solution or sample.

Note: The ISA is not necessary when all of the conditions that follow apply:

• The sample does not contain interferences.

• The sample pH is within the range given in the specifications.

• Omission of the ISA is accepted by the regulatory reporting agency (if the measurement is for regulatory

reporting).

6.4 Interferences

The sensing element will measure some other ions that are known to interfere with the method. The

probe response to other ions usually increases the mV potential and causes a positive error. The

response to other ions can be semi-quantitatively calculated through the Nikolsky equation, an

extended Nernst equation:

E = Eº + (RT/(zF))ln[aNa + KNax × ax]

Where

• ax = the activity of the interfering ion

• KNax = the selectivity coefficient for the interfering ion relative to the primary ion

The primary interferences for ammonium ion-selective electrodes are perchlorate (ClO4–), chlorate

(ClO3–) and iodide (I–). There is no procedure to remove the interference from these ions. Other

interferences are shown in Table 1. Addition of the Ammonium ISA adjusts the pH and prevents most

of the interferences from Table 1.

The selectivity coefficient is the approximate apparent increase in the measured concentration that is

caused by one unit of the interfering ion (e.g., 1 unit of K+ increases the ammonium concentration by

0.1). The approximate selectivity coefficients for some ions with the Intellical Ammonium ISE are

shown in Table 1.

8 English

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