Hach ISENA381 Series User manual

DOC022.53.80027
ISENA381
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............................................................................................... 8
5.1 Calibration notes ................................................................................................. 8
5.2 Calibration procedure........................................................................................... 9
Section 6 Sample measurement..................................................................... 10
6.1 Sample measurement notes ............................................................................. 10
6.2 Sample measurement procedure....................................................................... 10
6.3 Interferences ..................................................................................................... 11
Section 7 Verify the calibration........................................................................ 12
7.1 Verification procedure......................................................................................... 12
Section 8 Maintenance......................................................................................... 13
8.1 Clean the probe.................................................................................................. 13
8.2 Fill the probe....................................................................................................... 13
8.3 Replace the filling solution.................................................................................. 14
8.4 Storage............................................................................................................... 14
Section 9 Troubleshooting ............................................................................... 16
9.1 Slope check........................................................................................................ 17
9.2 Standard additions check................................................................................... 17
Section 10 Consumables..................................................................................... 18
10.1 Accessories...................................................................................................... 18
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Table of Contents
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Section 1 Product overview
The Intellical ISENA381 series probes are digital, combination ion-selective electrodes (ISE) that
measure the concentration of sodium in wastewater, drinking water and general water samples. The
probes are refillable and have a built-in temperature sensor and a double ceramic pin for a reference
junction. A 59-mL bottle of electrode filling solution is supplied with the probe. Refer to Figure 1.
Figure 1 Probe overview
1 Probe soaker bottle with storage solution 5 Cable
2 Glass bulb, reference junction and
temperature sensor
6 Probe soaker bottle holder
3 Filling-hole plug 7 Electrode filling and storage solution
4 Protective tape and filling hole 8 Dispensing cap
Section 2 Specifications
Specifications are subject to change without notice.
Specifications Details
Probe type Digital, combination ion selective probe with a double junction,
refillable junction reference and a built-in temperature sensor
Measurement range 0.023 mg/L (1x10–6 M) to 23,000 mg/L (1 M) Na+
Accuracy ±0.02 mV or 0.05% (the larger value)
Electrode resistance < 800 MΩ at 25 °C (77 °F)
Reference type Ag/AgCl
Reference junction Double ceramic porous pin junction
Slope –59 mV/pNa (90 to 110% at 25 °C (77 °F) per Nernstian theoretical
value)
Linear region 1.4 mg/L to 23,000 mg/L Na+
Temperature accuracy ±0.3 °C (±0.54 °F)
Temperature sensor type 30 kΩ NTC thermistor
Operating temperature 0 to 50 °C (32 to 122 °F)
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Specifications Details
Storage temperature 5 to 40 °C (41 to 104 °F)
Response time in linear region 1 to 2 minutes in sample concentration > 1.4 mg/L
Minimum sample volume 25 mL
Minimum immersion depth 25.4 mm (1 in.)
Electrode filling solution 0.02 M NH4Cl
Storage solution Long-term storage: 0.02 M NH4Cl
Short-term storage: User-prepared solution of 100-mg/L sodium
standard solution and one sodium ISA powder pillow per 25 mL
Sensor material pH glass
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: ISENA38101: 1 m (3.3 ft); ISENA38103: 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.
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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.
CAUTION
Personal injury hazard. Glass components can break. Handle with care to prevent cuts.
Section 4 Preparation for use
N O T I C E
Make sure to remove the protective tape from the filling hole of new probes. A probe with a blocked
filling hole will not operate correctly.
New probes are filled with electrolyte filling solution and have a soaker bottle that contains storage
solution to keep the glass bulb and reference junction hydrated. Prepare the probe for calibration and
measurement as follows.
1. Prepare the sodium (ISA) rinse solution as follows:
a. Pour a minimum of 25 mL of deionized water into a wash bottle.
b. Add one sodium ISA powder pillow (0.4 g) for each 25 mL of deionized water and mix. For
example, to prepare 200 mL of sodium ISA rinse solution, refer to Figure 2.
2. Remove the protective tape from the filling hole. Refer to Figure 3.
3. Rinse the reference junction and glass bulb with the prepared sodium ISA rinse solution. Blot dry
with a lint-free cloth. Do not use deionized water.
4. If the inner filling solution is low, add more filling solution. Refer to Fill the probe on page 13.
5. Condition the probe as follows:
a. Dissolve one Sodium Ionic Strength Adjustor (ISA) Powder Pillow in 25 mL of a 100 mg/L
sodium standard solution.
b. Open the filling hole.
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c. Put the probe in the prepared solution and soak the probe for 1 hour or more (8 hours for best
results).
Note: If probe stabilization is slow after storage, condition the probe for 1 hour or more (8 hours for best results)
in 25 mL of a 100 mg/L sodium standard solution that contains one Sodium Ionic Strength Adjustor (ISA)
Powder Pillow.
6. 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.
7. Connect the probe to the meter.
8. Open the filling hole before use. Keep the level of the electrolyte filling solution above the level of
the measurement liquid during use. Refer to Figure 4.
Figure 2 Prepare 200 mL sodium ISA rinse solution
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Figure 3 Remove the protective tape
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Figure 4 Probe position during use
1 Filling hole in open position 3 Level of calibration solution or sample
2 Level of electrolyte filling solution
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.
• Use only the prepared sodium ISA rinse solution to rinse the probe. Refer to Preparation for use
on page 5.
• For calibrations with low-level standards (<1 mg/L), use plastic beakers.
• 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.
• 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.
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