Hach-Lange ISENa38103 User Manual

User Manual

Sodium (Na+) Ion Selective Probe: Model ISENa38101 or ISENa38103

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.

DOC022.52

.80027

Specifications Details

Probe type Digital, combination ion selective probe with a double junction, refillable

junction reference and a built-in temperature sensor

Electrode resistance < 800 Mohms at 25 °C (77 °F)

Range 0.023 mg/L (1x10-6 M) to 23,000 mg/L (1 M) Na

Linear region 1.4 mg/L to 23,000 mg/L

Slope -59 mV/pNa (90 to 110% at 25 °C (77 °F) per Nernstian theoretical value)

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

Storage temperature range 5 to 40 °C (41 to 104 °F)

Junction Double ceramic porous pin

Reference type Ag/AgCl

Fill solution 0.02M NH4Cl

Response time in linear region 1 to 2 minutes in sample concentration > 1.4 mg/L

Minimum sample volume 25 mL

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 ISENa381 series probe is a refillable, combination sodium probe with a built-in temperature sensor (Figure 1). The ISENa38101 or ISENa38103 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 absolute mV values in wastewater, drinking water and general applications. The probe measures sodium concentration in water samples. A 59 mL bottle of 0.02 M NH4Cl Electrode Filling Solution is included with the probe.

Figure 1 Probe overview

1 Probe soaker bottle 4 Protective tape and filing-hole

2 Reference junction, glass bulb and temperature sensor 5 1 or 3 meter (3.28 or 9.84 ft) cable

3 Filling-hole cap 6 Probe soaker bottle holder

Preparation for use

Prepare the probe for use before calibration or sample measurement.

1. Turn the probe soaker bottle cap counter-clockwise to loosen the cap.

2. Remove the soaker bottle from the probe.

3. Rinse the reference junction and glass bulb with Ionic Strength Adjustor (ISA) rinse

solution (refer to Prepare the ISA rinse solution on page 11 cloth.

4. Remove the protective tape from the filling hole before initial use (refer to Figure 1 on page 2). Dispose of the protective tape.

5. Add filling solution to the probe as necessary (refer to Fill the probe on page 11). The filling solution must be above the standard solution or sample level during measurement (Figure 2).

6. Make sure that the filling hole is open during measurement for the proper flow of the filling solution.

Note: After long-term storage, the probe must be conditioned in 25 mL of 100 mg/L Na standard solution with the contents of one Sodium ISA powder pillow for at least 30 minutes prior to use. If probe stabilization is slow after storage, condition the probe for up to one hour in 25 mL of 100 mg/L Na+ standard solution with the contents of one Sodium ISA pillow.

). Blot dry with a lint-free

Figure 2 Measurement method

1 Container 3 Filling solution level

2 Probe body 4 Standard solution or sample level

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.

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

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.

• For measurements below 1 ppm (10-5 M), use plastic lab-ware.

• 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 12.

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. Make sure that the reference junctions are

fully immersed in the solution. Do not put the probe on the bottom or sides of the container. Shake the probe from side to side in the sample to refresh the reference junction.

2. In three separate beakers or appropriate containers, prepare 10, 100 and 1000 mg/L Na

standard solution or use appropriate standards that are above and below your application range as the standard set.

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 Sodium 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 Na+) standard solutions in the set.

5. Rinse the probe with ISA rinse solution (refer to Prepare

the ISA rinse solution

on page 11). Never use 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.

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 3).

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. For faster stabilization between measurements, put the probe in 100 mg/L sodium standard (containing Sodium ISA) that is similar in concentration to the samples to be analyzed.