Hach-Lange ISENH418103 User Manual

User Manual

Ammonium Probe: Model ISENH418101 or ISENH418103

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

.80029

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

in temperature sensor

Range 0.018 mg/L (10-6 M) to 9,000 mg/L (0.5 M) as Ammonium

Sample pH range pH 0 to 8.5

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

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 ISENH418101 or ISENH418103 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 ammonium concentration in water samples.

probe is a combination ammonium probe with a

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 ISENH4181 probe requires 10 and 100 mg/L Ammonium 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.

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.

• 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 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 Ammonium 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 Ammonium ionic strength adjustment (ISA) liquid 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 Ammonium 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.

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.

• 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 10.

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.

2. Prepare a minimum of 25 mL of the sample(s) in beakers or appropriate containers. Add the contents of one Ammonium ionic strength adjustment (ISA) liquid 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. 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.

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 NH

–N).

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

deionized water.

2. Add 5 mL of this solution to every 25 mL of standard or sample that is used.

Note: The ionic strength adjuster can be omitted only when all of the following conditions are true:

• The sample does not contain interferences.

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