Hanna Instruments HI 4221, HI 4222 User Manual

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Instruction Manual

HI 4221 & HI 4222

pH/mV/ISE/Temperature

Bench Meters

www.hannainst.com

Dear Customer, Thank you for choosing a Hanna Instruments product. This manual will provide you with the necessary

information for correct use of the instrument. Please read this instruction manual carefully before using the instrument. If you need additional technical information, do not hesitate to e-mail us at tech@hannainst.com or see the

back side of this manual for our worldwide sales and technical service contacts. These instruments are in compliance with

HI 4221 and HI 4222 are warranted for two years against defects in workmanship and materials when used for their intended purpose and maintained according to instructions. Electrodes and probes are guaranteed for six months. This warranty is limited to repair or replacement free of charge.

Damage due to accidents, misuse, tampering or lack of prescribed maintenance is not covered. If service is required, contact the dealer from whom you purchased the instrument. If under warranty, report

the model number, date of purchase, serial number and the nature of the failure. If the repair is not covered by the warranty, you will be notified of the charges incurred. If the instrument is to be returned to Hanna Instruments, first obtain a Returned Goods Authorization number from the Technical Service Department and then send it with shipping costs prepaid. When shipping any instrument, make sure it is properly packed for complete protection.

To validate your warranty, fill out and return the enclosed warranty card within 14 days from the date of purchase.

directives.

WARRANTYWARRANTY

WARRANTY

WARRANTYWARRANTY

TABLE OF CONTENTSTABLE OF CONTENTS

TABLE OF CONTENTS

TABLE OF CONTENTSTABLE OF CONTENTS

WARRANTY ...................................................................................................................................... 2

PRELIMINARY EXAMINATION .............................................................................................................. 4

GENERAL DESCRIPTION ...................................................................................................................... 4

FUNCTIONAL DESCRIPTION ................................................................................................................ 5

SPECIFICATIONS ................................................................................................................................ 8

OPERATIONAL GUIDE ....................................................................................................................... 9

DISPLAYING MODES ......................................................................................................................... 11

SYSTEM SETUP ............................................................................................................................... 14

pH SETUP ...................................................................................................................................... 20

mV SETUP ..................................................................................................................................... 32

ISE SETUP (HI 4222 only) .............................................................................................................. 33

pH CALIBRATION & MEASUREMENTS ................................................................................................. 39

mV & RELATIVE mV MEASUREMENTS ................................................................................................ 44

ISE CALIBRATION & MEASUREMENTS (HI 4222 only) ........................................................................ 46

LOGGING ....................................................................................................................................... 57

PC INTERFACE .................................................................................................................................... 62

pH BUFFER TEMPERATURE DEPENDENCE .......................................................................................... 63

ELECTRODE CONDITIONING & MAINTENANCE ..................................................................................... 64

TROUBLESHOOTING GUIDE .............................................................................................................. 66

TEMPERATURE CORRELATION FOR pH SENSITIVE GLASS ...................................................................... 67

ACCESSORIES .................................................................................................................................. 68

PRELIMINARY EXAMINATIONPRELIMINARY EXAMINATION

PRELIMINARY EXAMINATION

PRELIMINARY EXAMINATIONPRELIMINARY EXAMINATION

Remove the instrument from the packing material and examine it carefully to make sure that no damage has occurred during shipping. If there is any damage, notify your dealer or the nearest Hanna Service Center.

The meters are supplied complete with:

• HI 1131B Glass-body Combination pH Electrode

• HI 7662-T Temperature probe

• pH 4.01 & 7.01 Buffer solutions, 20 mL each

• HI 700661 Cleaning Solution, 2 x 20 mL

• HI 7071S Electrolyte solution

• HI 76404N Electrode Holder

• 12Vdc Power Adapter

• Instruction Manual

HI 4221 and HI 4222 are supplied with 12 Vdc/230 Vac adapter. HI 4221-01 and HI 4222-01 are supplied with 12 Vdc/115 Vac adapter.

Note: Save all packing material until you are sure that the instrument works properly. Any defective item

must be returned in the original packing with the supplied accessories.

GENERAL DESCRIPTIONGENERAL DESCRIPTION

GENERAL DESCRIPTION

GENERAL DESCRIPTIONGENERAL DESCRIPTION

HI 4221 and HI 4222 are professional bench meters with color graphic LCD for pH, ORP (Oxidation Reduction Potential), ISE (HI 4222 only) and Temperature measurements with Calibration Check. The display can be configured as a single channel or dual channel display (HI 4222 only) in various modes: Basic information only, GLP information, Graph mode and Log History mode. Each channel can be configured as pH, mV, Relative mV or ISE (HI 4222 only). The main features of the instruments are:

• One (HI 4221), or two (HI 4222) input channels;

• Manual selection, automatic and semiautomatic pH calibration up to five points, with standard (1.68, 3.00,

4.01, 6.86, 7.01, 9.18, 10.01 and 12.45) and custom buffers (up to 5 custom buffers);

• Manual Selection and Custom Standard ISE calibration up to five points, with standard (0.1, 1, 10, 100, 1000 ppm) and custom solutions (up to 5 custom solutions), with or without temperature compensation;

• AutoHold feature to freeze first stable reading on the LCD;

• Two selectable alarm limits;

• Five selectable logging modes: Automatic logging with and without AutoHold feature, Manual logging with or without AutoHold and AutoHold logging mode;

• Up to 100 logging lots;

• Selectable log interval and log sampling features for Automatic logging;

• GLP feature;

• Online and offline graph;

• User-friendly interface on large color graphic LCD (240x320 pixels);

• PC interface via RS232, and USB.

HI 4221 DESCRIPTION

FRONT PANEL

REAR PANEL

FUNCTIONAL DESCRIPTIONFUNCTIONAL DESCRIPTION

FUNCTIONAL DESCRIPTION

FUNCTIONAL DESCRIPTIONFUNCTIONAL DESCRIPTION

1) Liquid Crystal Display (LCD)

2) Main Keyboard

3) USB connector

4) ON/OFF switch

5) Power adapter socket

6) RS232 serial communication connector

7) Temperature probe socket

8) BNC electrode connector for pH/ORP measurements

9) Reference input socket

HI 4222 DESCRIPTION

FRONT PANEL

REAR PANEL

1) Liquid Crystal Display (LCD)

2) Main Keyboard

3) USB connector

4) ON/OFF switch

5) Power adapter socket

6) RS232 serial communication connector

7) Temperature probe socket (Channel 2)

8) BNC electrode connector for pH/ORP/ISE measurements (Channel 2)

9) Reference input socket (Channel 2)

10) Temperature probe socket (Channel 1)

11) BNC electrode connector for pH/ORP/ISE measurements (Channel 1)

12) Reference input socket (Channel 1)

KEYBOARD DESCRIPTION

FUNCTION KEYS

To enter/exit calibration mode.

To select the desired measurement mode, pH, mV, Rel mV (or ISE – HI 4222 only).

To enter Setup (System, pH, mV or ISE) and to access Log Recall function.

To obtain general informations about the selected option/operation.

VIRTUAL KEYS

The upper row keys are assigned to the virtual keys placed on the bottom of the LCD, which allow you to

perform the displayed function, depending on the current menu (e.g.

Measure

mode).

Note: All the virtual keys are assigned to the focused channel (HI 4222 only).

and in

LCD GENERAL DESCRIPTION

SPECIFICATIONSSPECIFICATIONS

SPECIFICATIONS

SPECIFICATIONSSPECIFICATIONS

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OPERATIONAL GUIDEOPERATIONAL GUIDE

OPERATIONAL GUIDE

OPERATIONAL GUIDEOPERATIONAL GUIDE

POWER CONNECTION

Plug the 12 Vdc adapter into the power supply socket. Notes: • These instruments use non volatile memory to retain the pH, Ion calibrations and all other

settings, even when unplugged.

• Make sure a fuse protects the main line.

ELECTRODE AND PROBE CONNECTIONS

For pH or ORP measurements connect a pH/ORP electrode with internal reference to the BNC connector located on the rear panel of the instrument (for the desired channel – HI 4222 only).

For ISE measurements (HI 4222 only) connect, to the desired channel, an ISE electrode with internal reference to the BNC connector located on the rear panel of the instrument.

For electrodes with a separate reference connect the electrode’s BNC to the BNC connector and the electrode’s reference to the reference input socket.

For temperature measurements and automatic temperature compensation connect the temperature probe to the appropriate socket (for the desired channel – HI 4222 only).

INSTRUMENT START UP

• Turn the instrument on from the power switch located on the rear panel of the instrument.

• Please wait until the instrument finishes the initialization process.

Note: It is normal for the loading process to take a few seconds. If the instrument doesn’t display the next

screen, restart the meter using the power switch. If the problem persists, contact your dealer.

CHANNEL SELECTION (HI 4222 only)

• Press

selection menu. Four available options will be displayed: Channel 1, Channel 2, or multi-channel with the first or the second channel focused. The “Choose Channel Configuration” message is displayed in the Reminder messages area.

• Select the desired option by pressing the appropriate key:

selected option

while in

, or . The instrument will enter in the

Measure

mode.

mode to access channel

DISPLAYING MODESDISPLAYING MODES

DISPLAYING MODES

DISPLAYING MODESDISPLAYING MODES

For each measurement mode (pH, mV, Rel mV or Ion) the following display configurations are available: Basic, Good Laboratory Practice (GLP), Graph and Log History.

Basic

Accessing this option, the measured value and its units are displayed on the LCD, along with the temperature value, temperature compensation mode, and GLP data.

To choose the Basic displaying mode:

• Press

the Reminder messages area.

• Press

while in

. The instrument will display the basic information for the selected measurement mode.

Measure

mode. The “Choose Display Configuration” message will be displayed in

GLP

Accessing this option, detailed GLP data will be displayed on the LCD for only: Last Calibration date and time, Offset and Slope values, Calibration Buffers/Standards and general information regarding the buffers/standards: the calibration temperature, temperature compensation mode, date and time. For

Note: If only a one-point pH calibration is performed or the current calibration does not include at least two consecutive

standard buffers of pH 4.01, 7.01 (6.86) and 10.01 (9.18) buffers, the Electrode Condition will be unknown.

To access the GLP displaying mode:

• Press

the Reminder messages area.

• Press . The instrument will display the detailed GLP data.

pH Measure

while in

, the Electrode Condition is also displayed on the LCD in percent.

Measure

mode. The “Choose Display Configuration” message will be displayed in

pH Measure

and

ISE Measure

modes

Graph

Accessing this option, the online graph with currently logged values (pH, mV, Rel mV, or ISE vs. Seconds) will be displayed.

If there is no active log, the previously logged data for the selected parameter will be plotted. Notes: • If no data were logged, the graph displaying mode will not be accessible.

• If no automatic log is saved, the offline graph will not be available.

To access the offline / online graph:

• Press

displayed in the Reminder messages area.

• Press

while in

Measure

Logging

mode. The “Choose Display Configuration” message will be

When the online graph is displayed:

•Use

• Press to access the zoom menu for Y axis. Use or for zooming Y (parameter) axis.

• Press

When the offline graph is displayed:

• Use the arrow keys to move the graph along X (Time) and Y (parameter) axes.

• Press

Note: While in zoom graph menu the key is not accessible.

• Press

Log History

Accessing this option, last logged records will be displayed on the LCD. The log history list also contains the appropriate mV values, the logged temperature, the temperature compensation source, as well as the records time stamp.

Note: If no data were logged, the “Log History Empty” message will be displayed on the LCD. To access the Log History displaying mode:

• Press

the Reminder messages area.

• Press . The instrument will display the log history regarding the selected

and to move the graph along X (Time) axis.

to return to the main menu.

to access the zoom menu for X and Y axes. Use , or / / /

to switch between the active zooming axes. Press or to zoom the selected axis.

to return to the main menu.

while in

Measure

mode. The “Choose Display Configuration” message will be displayed in

Measure

mode.

Notes: • When an alarm condition is active, all logged records will have an exclamation mark (!).

• If another

• If the temperature unit is changed, all logged temperature values will be automatically displayed in the new temperature unit.

Measure

mode is selected, the Log History will reset.

SYSTEM SETUPSYSTEM SETUP

SYSTEM SETUP

SYSTEM SETUPSYSTEM SETUP

The System Setup menu allows the user to customize the user interface, consult the meter information, set the external serial communication interface and to restore the manufacturer settings.

Accessing System Setup

• Press

• Press the LCD.

To access a System Setup option:

• Use

while in

. The system setup options will be displayed on

or to highlight the desired option.

Measure

mode.

• Press

The following is a detailed description of the System Setup option screen.

Beeper

This option allows the user to enable or disable the beeper. When the beeper is enabled, a specific beep will be heard when the reading becomes stable, when an alarm condition is reached, a wrong key is pressed.

to access the selected option.

when pressing a key or if

Stability Indicator

When the reading becomes stable, the instrument delivers a medium beep only if this option is ON, along with the “Stable” indicator on the LCD.

Alarm

If this option is ON, a continuous double beep will be heard each time the set limits in exceeded, along with the “Alarm” indicator on the LCD.

Measure

mode are

Key Pressed

If this option is ON, a short beep will be heard each time a valid key is pressed.

Wrong Key

If this option is ON, a long beep will be heard when an incorrect key is pressed. To set the Beeper:

• Press while in

• Press

Measure

mode.

• Use

or to select the Beeper option.

• Press desired beeper status option you want to modify.

• Press desired option.

• Press menu or press

changing.

Saving Confirmation

When enabling this option, a prompt will appear on the LCD alerting the user to save the modified values by pressing

editing mode by pressing

To modify the Saving Confirmation option:

• Press

• Use

• Press desired Saving Confirmation option.

• Press cancel operation.

and use or to highlight the

to confirm your selection and return to the Beeper

to return to the Beeper menu without

, exiting without saving by pressing or canceling the saving operation and return to the

. If disabled, the modified values will be saved automatically.

while in

or to select the Saving Confirmation option.

and use or to highlight the

to confirm your selection or press

Measure

mode.

GLP Data

This option allows the user to set general information which will appear in the log reports. The options are available for both channels (HI 4222 only) and can have a max of 10 characters.

Operator ID Instrument ID Company Name Additional Info 1 & Additional Info 2

– this option allows you to edit the name of the operator.

– this option allows you to edit an identification name/number for the instrument.

– this option allows you to edit the company name.

– for general purpose notations.

To set the GLP Data:

• Press

• Use

• Press desired option.

• Press will be displayed on the LCD.

• Enter the desired information by accepting the highlighted character which is added to the text bar, using

possible to delete the last character by positioning the cursor on the Backspace character (

• Press the modified option,

the modified options are saved automatically.

Date & Time

This option allows the user to set the current date & time and the format in which they appear. These parameters will be displayed on the

while in

or to select the GLP Data option.

and use or to highlight the

to edit the desired information. The Text Editor menu

keys help the user select the desired character. It is also

to return to the GLP Data options. If the Saving Confirmation is enabled, press to accept

Measure

mode.

. The and

) and pressing .

to escape without saving or to return to the editing mode. Otherwise,

Measure

screens and also when storing measured data.

Set Date and Time

This option allows you to set the current date (year/month/day) and time (hour/minute/second). Notes: • Only years starting with 2000 are accepted.

• The time is set using the selected time format. For 12 Hour time format only, the AM/PM can also be selected with

or .

Set Time Format

This option allows you to choose between 12 Hour (AM/PM) time format and 24 Hour time format from the displayed pop-up menu.

Set Date Format

This option allows you to choose the desired date format from 6 available options: DD/MM/YYYY; MM/DD/YYYY; YYYY/MM/DD; Mon DD, YYYY; DD-MM-YYYY and YYYY-Mon-DD.

To set the Date & Time:

• Press

while in

Measure

mode.

• Use

or to select the Date & Time option.

• Press desired option you want to modify.

• Press to select next/previous entry to be edit. Press and use

to save the modified value (for Set Date and Time option). For the other two options press and select one of the displayed options with

• Press Time options.

• Press is enabled, press

return to the editing mode. Otherwise, the modified option is saved automatically.

Note: If the time is changed with more than one hour before last pH/ION calibration, a pop-up warning will

appear on the LCD, notifying the user that a date/time conflict has occured and some time-dependent modes could work improperly (e.g.

LCD Setup

This option allows the user to set the Contrast, the Backlight of the LCD and the Backlight Saver. The Contrast parameter can be adjusted within 7 steps, while the Backlight parameter within 4 steps. The Backlight Saver can be set from 1 to 60 minutes or it can be OFF (disabled). All the changes are visible on the LCD for each parameter.

Note: If the instrument backlight is turned off after the set period of time, press any key to turn it back on. To set the LCD Setup:

• Press

• Use

and use or to highlight the

to confirm your selection. Use /

or to set the desired value, then press

to confirm your selection

or .

to confirm your selection and return to the Date &

to return to Date & Time options (for Set Date and Time option only). If the Saving Confirmation

to accept the modified option, to escape without saving or to

Measure

, GLP, Log).

while in

or to select the LCD Setup option.

Measure

mode.

• Press

• Use or to adjust the contrast / backlight or to set the desired backlight saver time.

• Press System Setup menu.

and use key to highlight the desired parameter.

to confirm the modified options and return to the

Language

This option allows the user to choose the desired language in which all information will be displayed. To select the Language:

• Press

• Use

while in

or to select the Language option.

Measure

mode.

• Press desired language.

• Press Setup menu or press

menu without changing.

Note: After selecting the desired language, a warning pop-up is

displayed on the LCD, informing the user that the selected language becomes the current language only after restarting the instrument.

Serial Communication

This option allows the user to set the desired speed for the serial communication (baud rate) between the instrument and PC. The meter and the PC program must have the same baud rate.

To set the Serial Communication:

• Press

• Use option.

• Press desired baud rate.

• Press Setup menu or press

menu without changing.

and use or to highlight the

to confirm your selection and return to the System

to return to the System Setup

while in

or to select the Serial Communication

and use or to highlight the

to confirm your selection and return to the System

Measure

mode.

to return to the System Setup

Meter Information

This option provides general information about the instrument serial number (each instrument has an unique identification serial number), the software version and the factory calibration date and time (for mV and temperature).

Note: All the instruments are factory calibrated for mV and temperature. After one year following factory

calibration, the “Factory Calibration Due” message will appear on the LCD, in the Reminder messages area, notifying the user that the instrument should be taken to the nearest Hanna Customer Service for factory calibration.

To view the Meter Information:

• Press

• Use

while in

or to select the Meter Information option.

Measure

mode.

• Press Information or press

menu.

Restore Factory Settings

This option allows the user to reset the instrument to the default factory settings. To restore the Factory Settings:

• Press

• Use option.

• Press displayed, asking for confirmation.

• Press Setup or press

without restoring defaults.

• Press

to confirm your selection and to view the Meter

to return to the System Setup

while in

or to select the Restore Factory Settings

to confirm your selection. A pop-up menu will be

to confirm your selection and return to the System

to return to

Measure

mode.

to return to the System Setup menu

Measure

mode.

pHpH

SETUP SETUP

SETUP

pHpH

SETUP SETUP

The pH Setup menu allows the user to set the parameters associated with pH measurement and calibration. These parameters can be set specifically for each channel (HI 4222 only). The settings will be applied only to the active channel.

Accessing pH Setup

• Press select pH range for the desired channel.

• Press

To access a pH Setup option:

• Use

while in

and then to access pH Setup menu.

or to highlight the desired option.

Measure

mode and then to

• Press

The following is a detailed description of the pH Setup option screens.

Temperature

The temperature has a direct influence on pH. This option allows the user to choose the temperature source and units, as well as the desired manual temperature for manual temperature compensation mode.

Temperature Source

If using a temperature probe, Automatic Temperature Compensation will be performed relative to the displayed temperature, with the “ATC” indicator displayed on the LCD. For HI 4222 only, the ATC option can be selected for Channel 1 or Channel 2, in accordance with the active channel utilizing a probe, or for both channels if two temperature probes are used. If no temperature probe is detected, Manual Temperature Compensation will be performed, with the “MTC” indicator on the LCD.

to access the selected option.

(HI 4222 only)

Temperature Unit

Accessing this option, the desired temperature unit can be chosen (Celsius, Fahrenheit or Kelvin degrees) and the meter will automatically make the conversion for the selected unit.

Manual Temperature

If no temperature probe is connected, the desired temperature can be set manually. The default setting is 25°C. If the measured temperature is different, the value can be manually adjusted in order to obtain an accurate pH reading.

To set one of the Temperature options:

• Press

while in

pH Measure

mode.

• Press

• Use or to select the Temperature option.

• Press desired Temperature option you wish to modify.

• Press desired option (for Temperature Source & Unit options) or use

the displayed limits (for Manual Temperature option).

• Press Unit options) or press Temperature option). Otherwise, press

Calibration

This option allows the user to set all the data regarding the pH calibration process.

and use or to highlight the

or to adjust the temperature value between

to confirm your selection (for Temperature Source &

to save the current value (for Manual

to cancel operation.

Buffer Entry Type

Three entry modes for the pH buffers used for calibration are available: Automatic Semiautomatic – the instrument automatically selects the closest buffers to the measured pH value from all

available buffers and you can choose the one used. Manual Selection – the desired pH buffer is manually selected from all available buffers, regardless of measured value.

To set the Buffer Entry Type:

• Press while in

– the instrument automatically selects the closest buffer to the measured pH value from the edit buffer group.

pH Measure

mode.

• Press

• Use

• Press Buffer Entry Type option.

• Press desired option.

• Press cancel operation.

or to select the Calibration option.

and use or to highlight the

to confirm your selection or press

1st Cal. Point

Two options are available for the 1st Cal. Point parameter: Point and Offset. If Point option is selected, the slope values adjacent to the calibration points will be reevaluated (normal calibration). If at least a two-point calibration has been performed and an offset correction of the electrode is wanted

(maintaining the existing slope values), perform a one-point calibration using the Offset option. To set the 1st Cal. Point:

• Press while in

pH Measure

mode.

• Press

• Use

• Press Cal. Point option.

• Press desired option.

• Press cancel operation.

or to select the Calibration option.

and use or to highlight the 1st

and use or to highlight the

to confirm your selection or press

Edit Custom Buffers

If you want to use other buffers than the ones already memorized, the Edit Custom Buffers option is available, allowing you to set the desired pH buffers. Up to five pH custom buffers can be set.

To edit/set the Custom Buffers:

• Press

• Use

• Press Custom Buffers option.

• For a previous set value, press to set the custom buffer value to “----” if desired and confirm the setting by pressing otherwise press

while in

or to select the Calibration option.

and use or to highlight the Edit

pH Measure

to edit the selected custom buffer.

mode.

• While in edit custom buffer menu press buffer value to 7.000 pH and then use

the desired custom buffer value.

to set the custom

or to set

• Press the modified option,

the modified option is saved automatically.

• Use

to exit custom buffer edit menu. If the Saving Confirmation is enabled, press to accept

to escape without saving or to return to the editing mode. Otherwise,

key to select the next custom buffer to be set or press to return to Calibration options.

Edit Buffer Group

Accessing this option the user can edit the desired group of five pH buffers for automatic buffer recognition (Automatic Buffer Entry Type). If the Buffer Group already contains five pH buffers, at least one pH buffer has to be removed in order to add another buffer.

To edit/set the Buffer Group:

• Press

while in

pH Measure

mode.

• Press

• Use

• Press Buffer Group option.

• Press buffer to be included in the buffer group.

• Press to/from the buffer group.

• Press

or to select the Calibration option.

and use or to highlight the Edit

and use and to choose the pH

or to add/remove the selected pH buffer

to return to Calibration options and to save the changes.

Calibration Reminder

In order to have accurate readings, the instrument must be calibrated frecquently. Three options are available for the calibration reminder: Daily, Periodic or Disabled.

To set the Calibration Reminder:

• Press while in

• Press

• Use or to select the Calibration option.

• Press Calibration Reminder option.

• Press desired option.

• Press cancel operation.

and use or to highlight the

to confirm your selection or press

pH Measure

mode.

Set Reminder Period

If choosing Daily or Periodic options for the Calibration Reminder, the Set Remind Period must be accessed in order to set the time interval until next calibration. The time interval between two calibrations can be set up to 1 day / 1 year for Daily / Periodic options.

Note: If Set Reminder Period parameter is accessed and the Calibration Reminder is disabled, a warning

message appears on the LCD informing the user that the reminder period can be set only if the Calibration Reminder is set as Daily or Periodic.

To set the Reminder Period:

• Press while in

pH Measure

mode.

• Press

• Use or to select the Calibration option.

• Press Reminder Period option.

• Press ous entry to be edit.

• Press value, then press

• Press accept the modified option,

Otherwise, the modified option is saved automatically.

and use or to highlight the Set

and use / to select next/previ-

and use or to set the desired

to save the modified value.

to return to the Calibration options. If the Saving Confirmation is enabled, press to

to escape without saving or to return to the editing mode.

Clear Calibration

Accessing this option, the existent pH calibration relative to the selected channel can be cleared. If the calibration is cleared, another calibration has to be performed.

To clear Calibration:

• Press

• Use

while in

or to select the Calibration option.

pH Measure

mode.

• Press Clear Calibration option.

• Press displayed asking for confirmation.

• Press saving and return to the Calibration options.

and use or to highlight the

to clear calibration. A pop-up menu will be

to confirm or press to escape without

Sample ID

This option allows the user to give to the measured samples an identification number/name. Two Sample ID options are available: ID Increment Mode and Edit Sample ID.

ID Increment Mode

Two increment modes for the sample ID can be selected:

– the sample ID will be fixed and it can be set alphanumerically.

None Automatic To set the ID Increment Mode:

• Press

– the sample ID will be increased with 1 from the set value, for each new log lot.

while in

pH Measure

mode.

• Press

• Use

• Press Increment Mode option.

• Press desired option.

• Press cancel operation.

or to select the Sample ID option.

and use or to highlight the ID

and use or to highlight the

to confirm your selection or press

Edit Sample ID

This option allows the user to edit the sample ID. Note: If the ID Increment Mode is set to None, the sample ID can be set alphanumerically, otherwise it can be

set only numerically.

To edit the Sample ID:

• Press

• Use

• Press Sample ID option.

• Press

• If the selected increment mode is None, the Text Editor menu will be displayed on the LCD, allowing you to enter the desired sample number/name by accepting the highlighted character which is added

in the text bar, using

while in

or to select the Sample ID option.

and use or to highlight the Edit

to confirm your selection.

pH Measure

. The and keys help

mode.

the user to select the desired character. It is also possible to delete the last character by positioning the cursor on the Backspace character and pressing

• Press

Confirmation is enabled, press option,

return to the editing mode. Otherwise, the modified options are saved automatically.

• If the selected increment mode is Automatic, the desired sample ID value can be set using or .

• Press

cancel operation.

Stability Criteria

This option allows the user to select the signal stability criterion for the measured parameter (pH, mV, ISE): Fast – this criterion will give faster results with less accuracy. Medium – this criterion will give medium speed results with medium accuracy. Accurate – this criterion will give slower results with high accuracy.

To set the Stability Criteria:

• Press

to return to Sample ID options. If the Saving

to accept the modified

to escape without saving or to

to save the current value or press

while in

pH Measure

mode.

• Use or to select the Stability Criteria option.

• Press desired option.

• Press cancel operation.

Reading Mode

This option allows the user to select between Direct and Direct/AutoHold pH reading mode. If choosing the second option, the current reading can be frozen on the LCD when

and use or to highlight the

to confirm your selection or press

is pressed and if the stability criterion is reached.

To set the Reading Mode:

• Press

while in

pH Measure

mode.

• Press

• Use or to select the Reading Mode option.

• Press desired option.

• Press cancel operation.

Log

This option allows the user to edit the logging settings: Logging Type, Logging Data Configuration, Sampling Period and New Lot.

and use or to highlight the

to confirm your selection or press to

Logging Type

Three logging types are available: Automatic, Manual and AutoHold. With the Automatic type the values are logged automatically at constant time intervals while with the Manual type the user has the capability to log a

measured value by pressing after the logging session was started.

To set the Logging Type:

• Press

while in

. With the AutoHold type the stored values are only the ones frozen on the LCD

pH Measure

mode.

• Press

• Use

• Press Logging Type option.

• Press desired option.

• Press cancel operation.

or to select the Log option.

and use or to highlight the

to confirm your selection or press to

Logging Data Configuration

This option allows the user to select the parameters that accompany a logged value: Date/Time/Channel, Calibration Data, Sample ID, Instrument ID, Operator ID, Company Name, Aditional Info 1 and Aditional Info 2.

To set the Logging Data Configuration:

• Press

while in

pH Measure

mode.

• Press

• Use or to select the Log option.

• Press Logging Data Configuration option.

• Press parameter to be logged in file.

• Press

it by selecting No.

• Press

and use or to highlight the

and use or to highlight the desired

to confirm your selection and use or

to enable the parameter by selecting Yes or to disable

to confirm your selection or press

to cancel operation.

Sampling Period

This option allows the user to select the desired sampling period for automatic logging type. To set the Sampling Period:

• Press while in

• Press

• Use

• Press Sampling Period option.

• Press option.

• Press cancel operation.

or to select the Log option.

and use or to highlight the

and use or to select the desired

to confirm your selection or press to

pH Measure

mode.

New Lot

Accessing this option, a new manual lot can be generated next time you want to manually log a measured value. Note: If New Lot option is accessed and the Logging Type is Automatic, a warning message appears on the LCD

informing the user that a new lot can be created only if the Logging Type is set as Manual.

To generate a New Lot:

• Press

while in

pH Measure

mode.

• Use

or to select the Log option.

• Press New Lot option.

• Press will be displayed asking for confirmation.

• Press saving and return to the Log options.

Alarm

This option allows the user to edit the alarm settings: Alarm State and Alarm Limits. If the Alarm option is enabled, a continuous double beep will be heard, along with the “Alarm” indicator blinking on the LCD, each time the set limits in

and use or to highlight the

to generate a new manual lot. A pop-up menu

to confirm or press to escape without

Measure

mode are exceeded.

Alarm State

Three modes are available for the Alarm State option: Disabled – the alarm will be disabled. Inside Limts – the alarm will notify the user when the measured value is inside the set limits. Outside Limits – the alarm will notify the user when the measured value is outside the set limits.

To set the Alarm State:

• Press

while in

pH Measure

mode.

• Press

• Use or to select the Alarm option.

• Press Alarm State option.

• Press desired option.

• Press cancel operation.

and use or to highlight the

to confirm your selection or press

Alarm Limits

This option allows the user to set the alarm limits for the measured value. Note: The Alarm High value can not be lower than the Alarm Low value.

To set the Alarm Limits:

• Press

while in

pH Measure

mode.

• Press

• Use or to select the Alarm option.

• Press Alarm Limits option.

• Press entry to be edit.

• Press value, then press

• Press Confirmation is enabled, press option,

to the editing mode. Otherwise, the modified option is saved automatically.

Isopotential Point

This option allows the user to edit the isopotential point of the electrode used for pH measurements. The isopotential point is the mV reading for an electrode at which temperature has no effect on the measurement. The ideal electrode has an isopotential point of 0.0 mV and 7.00 pH, while an actual electrode tipically deviates slightly from the ideal values.

If the actual isopotential pH for an electrode is known, it can be set by accessing this option. The isopotential pH limits (low and high) will be displayed on the LCD.

Note: If the isopotential point has been modified, recalibration

must be performed for the respective channel.

To set the Isopotential Point:

• Press

and use or to highlight the

and use / to select next/previous

and use or to set the desired

to save the modified value.

to return to the Alarm options. If the Saving

to accept the modified

to escape without saving or to return

while in

pH Measure

mode.

• Press

• Use

• Press

• Press cancel operation.

or to select the Isopotential Point option.

and set the desired isopotential pH value using

or .

to save the current value or press

pH Resolution

Accessing this option, the desired pH resolution can be set, with one (x.x), two (x.xx) or three (x.xxx) decimals. To set the pH Resolution:

• Press

while in

pH Measure

mode.

• Press

• Use

• Press desired option.

• Press cancel operation.

or to select the pH Resolution option.

and use or to highlight the

to confirm your selection or press

mVmV

SETUP SETUP

SETUP

mVmV

SETUP SETUP

The mV Setup menu allows the user to set the parameters associated with mV and Relative mV measurements. These parameters can be set specifically for each channel (HI 4222 only). The settings will be applied only to the active channel.

Accessing mV Setup

• Press

while in

to select mV / mV Rel range for the desired channel.

Measure

mode and then or

• Press

To access a mV Setup option:

• Use

• Press

The following is a detailed description of the mV Setup option screens.

Temperature – See pH Setup section, page 20. Note: To access mV Setup, press

Sample ID – See pH Setup section, page 20.

Stability Criteria – See pH Setup section, page 20.

Reading Mode – See pH Setup section, page 20.

Log – See pH Setup section, page 20.

Alarm – See pH Setup section, page 20. Note: The Alarm Limits (Low and High) are set in mV units.

and then to access mV Setup menu.

or to highlight the desired option.

to access the selected option.

and then .

ISEISE

SETUP (HI 4222 SETUP (HI 4222

ISE

SETUP (HI 4222

ISEISE

SETUP (HI 4222 SETUP (HI 4222

The ISE Setup menu allows the user to set the parameters regarding ISE measurement and calibration. These parameters can be set specifically for each channel. The settings will be applied only to the active channel.

Accessing ISE Setup

• Press select ISE range for the desired channel.

• Press

To access an ISE Setup option:

• Use

while in

and then

or to highlight the desired option.

Measure

mode and then to

to access ISE Setup menu.

onlyonly

only

onlyonly

))

)

))

• Press

The following is a detailed description of the ISE Setup option screens.

Reading Mode

This option allows the user to select the desired reading mode: Direct, Direct/AutoHold, Known Addition, Known Subtraction, Analyte Addition and Analyte Subtraction. Except Direct and Direct/AutoHold, all the other methods are incremental (see ISE Theory section for details, page 54).

Direct

If using Direct reading mode, the ion concentration can be read directly from the instrument. Make sure the instrument was calibrated before taking measurements.

Direct/AutoHold

If using Direct/AutoHold reading mode, the ion concentration can be frozen on the LCD after starting the AutoHold mode.

Known Addition

In the Known Addition method a standard with a known concentration of the measured ion is added to the sample. The difference in mV potential is then used to calculate the concentration of the ion in the sample.

Known Subtraction

In the Known Subtraction method a standard with a known concentration is added to the sample, reacting with the ion to be measured. The stoichiometric ratio between standard and sample must be known. The ion concentration is then calculated using the difference in mV potential.

The method is especially usefull when there is no available ISE for the measured ion.

to access the selected option.

Analyte Addition

This method is similar to the Known Addition method, with the difference that an aliquot of sample is added to a standard of known concentration. The sample and standard contain the same ion to be measured. The ion concentration is then calculated using the difference in mV potential.

Analyte Subtraction

In the Analyte Subtraction method an aliquot of sample is added to a standard of known concentration, reacting with the ion to be measured. The stoichiometric ratio between standard and sample must be known. The ion concentration is then calculated using the difference in mV potential. The method is especially usefull when there is no available ISE for the measured ion.

To set the Reading Mode:

• Press

• Use

while in .

or to select the Reading Mode option.

ISE Measure

mode.

• Press desired option.

• Press cancel operation.

Temperature – See pH Setup section, page 20. Notes: • To access ISE Setup, press

• The Temperature Compensation option is also included in the Temperature parameter.

and use or to highlight the

to confirm your selection or press

and then .

Temperature Compensation

This option allows the user to enable / disable the temperature compensation for the measurement of Ion concentration.

To set the Temperature Compensation:

• Press

• Use

• Press Temperature Compensation option.

• Press the Temperature Compensation.

while in .

or to select the Temperature option.

and use or to highlight the

and use or to enable / disable

ISE Measure

mode.

• Press

Note: If an ISE calibration was performed and the Temperature Compensation option is changed, a warning

message appears on the LCD informing the user to perform a new calibration or to set the previous option in order to perform accurate measurements.

Calibration

This option allows the user to set all the data regarding the Ion calibration process.

to confirm your selection or press

to cancel operation.

Standard Entry Type

Two entry modes for the standard solutions used for calibration are available: Manual Selection

a standard solutions list (0.1 ppm, 1 ppm, 10 ppm, 100 ppm and 1000 ppm). Custom Standard

a displayed pop-up menu. To set the Standard Entry Type:

• Press

• Use

– when the calibration is started, the desired standard solution can be manually selected from

– when the calibration is started, each standard solution can be manually set (in ppm units) in

while in .

or to select the Calibration option.

ISE Measure

mode.

• Press Standard Entry Type option.

• Press desired option.

• Press cancel operation.

Calibration Reminder Set Reminder Period Clear Calibration

Electrode Type

This option allows the user to select the desired Ion Selective Electrode used for measurements from a list: Ammonia, Bromide, Cadmium, Calcium, Carbon Dioxide, Chloride, Chlorine, Cupric, Cyanide, Fluoride, Iodide, Lead, Nitrate, Potassium, Silver, Sodium, Sulfate, Sulfide and five custom ISE. For the standard ISE it is possible to view the Ion constants (Name, Molar Weight and Electric Charge/Slope), while for the custom ISE all these constants can be manually set.

and use or to highlight the

to confirm your selection or press

– See Calibration option from pH Setup section, page 20.

To set the Electrode Type:

• Press

• Use

while in .

or to select the Electrode Type option.

ISE Measure

mode.

• Press standard ISE or a custom one from the list. For standard ISE:

• Press

For custom ISE:

• Press

• For the Ion name the Text Editor menu will be displayed

• To set the appropriate Ion molar weight (in g/mol units)

and use or to select the desired

to visualize the Ion constants and then press

at any time to exit Ion Constants view mode.

to confirm your selection and return to

Setup

options.

to edit the Ion constants for the selected custom ISE. Use Ion constant and press mode or

on the LCD. Enter the desired information by accepting the highlighted character which is added in the text bar,

using user to select the desired character. It is also possible to

delete the last character by positioning the cursor on the Backspace character and pressing

Confirmation is enabled, press modified option,

modified option is saved automatically.

use or and then press to save the current value or press

. The and keys help the

to return to the Ion Constants menu. If the Saving

to return to the editing mode. Otherwise, the

or to select the desired

to enter Ion constant edit

to cancel operation.

to escape without saving or

to cancel operation.

ISE

. Press

to accept the

• To select the appropriate Electric Charge/Slope use or and then press . If the Ion

electric charge is None, its slope can be manually set by pressing

the LCD, in which the slope value can be set using or . Press to save the modified value or press

Note: If an ISE calibration was performed and a different Ion

Selective Electrode is selected (standard or custom), a warning message appears on the LCD informing the user to perform a new calibration or to select the previous ISE in order to perform accurate measurements.

Concentration Unit

Accessing this option, the user can select the desired concentration unit for the measured ion or chemical compound. The available concentration units are: ppt (g/L), ppm (mg/L), ppb (µg/L), mg/mL, M (mol/L), mmol/L and %w/v.

To set the Concentration Unit:

• Press

• Use

while in .

or to select the Concentration Unit option.

. A pop-up menu will be displayed on

to return to the Ion Constants menu.

ISE Measure

mode.

• Press desired option.

• Press cancel operation.

Sample ID – See pH Setup section, page 20.

Stability Criteria – See pH Setup section, page 20.

Log – See pH Setup section, page 20. Note: The Logging Data Configuration option includes also the Ion Constants parameter. If you want it to appear

in the log reports, it must be enabled.

Alarm – See pH Setup section, page 20. Note: The Alarm Limits (Low and High) are set in the selected concentration unit of the measured ion or chemical

compound and are displayed in a scientific format (value and value exponent).

and use or to highlight the

to confirm your selection or press

Isopotential Point

This option allows the user to edit the isopotential point of the electrode used for ion measurements. The ion selective electrodes have different isopotential points. If temperature compensation is desired for the ion measurements, the isopotential point value is absolutely necessary.

The isopotential point is always edited in ppm (mg/L) units. To set the Isopotential Point:

• Press

• Use

while in .

or to select the Isopotential Point option.

ISE Measure

mode.

• Press the isopotential point value.

• Press

• Press Confirmation is enabled, press

mode. Otherwise, the modified option is saved automatically.

Note: If an ISE calibration was performed and the Isopotential Point option is changed, a warning message

ISE Significant Digits

Accessing this option, the number of ISE significant digits can be set, with one (x), two (xx) or three (xxx) significant digits.

To set the ISE Significant Digits:

• Press

• Use option.

• Press desired option.

• Press cancel operation.

and use or to increase / decrease

key to save the modified value. to return to the Ion Setup options. If the Saving

to accept the modified option,

to escape without saving or to return to the editing

appears on the LCD informing the user to perform a new calibration or to set the previous option in order to perform accurate measurements.

while in .

or to select the ISE Significant Digits

and use or to highlight the

to confirm your selection or press to

ISE Measure

mode.

pH CALIBRATION & MEASUREMENTSpH CALIBRATION & MEASUREMENTS

pH CALIBRATION & MEASUREMENTS

pH CALIBRATION & MEASUREMENTSpH CALIBRATION & MEASUREMENTS

H CALIBRATIONH CALIBRATION

H CALIBRATION

H CALIBRATIONH CALIBRATION

Calibrate the instrument often, especially if high accuracy is required. The instrument should be recalibrated:

• Whenever the pH electrode is replaced.

• At least once a week.

• After testing aggressive chemicals.

• When “No pH Calibration” or “pH Calibration Expired” message appears on the LCD, in the Reminder messages area.

PREPARATION

Pour small quantities of the buffer solutions into clean beakers. If possible, use plastic beakers to minimize any EMC interferences.

For accurate calibration and to minimize cross-contamination, use two beakers for each buffer solution. One for rinsing the electrode and one for calibration.

If you are measuring in the acidic range, use pH 7.01 or 6.86 as first buffer and pH 4.01/3.00 or 1.68 as second buffer. If you are measuring in the alkaline range, use pH 7.01 or 6.86 as first buffer and pH 10.01/

9.18 or 12.45 as second buffer.

For extended range measurements (acidic and alkaline), perform a five-point calibration by selecting five of the available buffers.

CALIBRATION PROCEDURE

Calibration has a choice of 8 memorized buffers: pH 1.68, 3.00, 4.01, 6.86, 7.01, 9.18, 10.01, 12.45 and up to 5 custom buffers.

For accurate measurements it is recommended to perform a five-point calibration. However, at least a two-point calibration is suggested.

pH Calibration screen description

Three buffer entry types are available: Automatic, Semiautomatic and Manual Selection. The default option is Manual Selection.

To calibrate the instrument using Manual Selection buffer entry type:

• Press can be cleared by pressing Note: It is very important to clear calibration history when a new electrode is used

• Immerse the pH electrode and the temperature probe approximately 4 cm (1½”) into a buffer solution of your choice (pH 1.68, 3.00, 4.01, 6.86, 7.01,

9.18, 10.01, 12.45 or a custom buffer) and stir gently. The temperature probe should be close to the pH electrode.

• Select the used pH calibration buffer with wait...” message will appear on the LCD until the reading is stable or the buffer

is validated.

• If the pH buffer is validated, calibration buffer will be added to the Calibrated Buffers section.

• Immerse the pH electrode and the temperature probe into the next buffer solution and follow the above procedure or press

Notes: • The new added calibration point will replace an old one

• If the existing stored calibration is full (five calibration

. If the instrument was calibrated before and calibration was not cleared, the old calibration

. After 10 seconds, will no longer be available.

because most errors and warning messages that appear during calibration depend on calibration history.

or . The “Please

will appear on the LCD. Press to update calibration. The

to exit calibration.

if the difference between them is ±0.2 pH.

points), a pop-up menu will be displayed on the LCD in which you can select with keys the buffer you want to replace with the current buffer. Press and then press the new buffer.

to delete the selected buffer

to update calibration with

• When in MTC mode, if pressing pH calibration and while a HANNA pH calibration buffer

with a x.xxx resolution is selected, a pop-up menu will be displayed on the LCD in which the temperature value can be ajusted using

to save the new temperature value.

or . Press

after entering

• When in MTC mode, if pressing after entering calibration and while a custom pH calibration buffer is

selected, a pop-up menu will be displayed on the LCD in which the custom buffer and the temperature value

can be ajusted by pressing or keys. Press to save the modified value and then

previous value to be adjusted.

and then

/ to select next/

• When in ATC mode, if pressing calibration and while a standard pH buffer (with a

x.xxx resolution) or a custom pH buffer is selected, a pop-up menu will be displayed on the LCD in which

the buffer value can be ajusted using

. Press to save the new buffer value.

• If the Automatic buffer entry type has been selected for the calibration procedure, the instrument will automatically select the closest buffer to the measured pH value from the edit buffer group (see pH Setup for details, page 20).

• If the Semiautomatic buffer entry type has been selected for the calibration procedure, the instrument will automatically select the closest buffers to the measured pH value from all the available buffers

and the used buffer value can be selected with or .

CALIBRATION MESSAGES

• Wrong buffer. Please check the buffer: this message appears when the difference between the pH

reading and the value of the selected calibration buffer is significant. If this message is displayed, check if you have selected the appropriate calibration buffer.

• Wrong buffer temperature: this message appears if the buffer temperature is out of the defined buffer

temperature range.

• Clean the electrode or check the buffer. Press <Accept> to update calibration: this message alerts the

user that some dirt or deposits could be on the electrode. Refer to the electrode Cleaning Procedure (see page 65).

• Slope too low. Please check the buffer / Slope too high. Please check the buffer: these messages appear

if the current slope is under 80% or over 110% of default slope. Recalibrate the instrument using fresh buffers.

• Slope too low. Press <Clear Cal> to clear old calibration / Slope too high. Press <Clear Cal> to clear old calibration: these messages appear as a result of an erroneous slope condition. Follow displayed instructions.

after entering

• Unrecognized buffer. Please check the buffer or the buffer list (for Semiautomatic and Automatic buffer entry type): this message appears if the current buffer value is not close to any of the buffers from the buffer list/group. Check if the current buffer is present in the buffer list or the appropriate buffer group was selected.

• The current buffer was already calibrated. Press <Accept> to recalibrate in this point, or change the buffer: this message appears when calibration is performed in one of the previous calibrated buffers. Follow displayed instructions.

H MEASUREMENTSH MEASUREMENTS

H MEASUREMENTS

H MEASUREMENTSH MEASUREMENTS

Make sure the instrument has been calibrated before taking pH measurements.

DIRECT MEASUREMENT

To measure the pH of a sample using the Direct reading mode:

• Press (for the selected channel – HI 4222 only).

• Select the Direct reading mode (see pH Setup for details, page 20).

• Submerge the electrode tip and the temperature probe approximately 4 cm (1½”) into the sample to be tested. Allow time for the electrode to stabilize.

• The measured pH value will be displayed on the LCD, together with a short GLP information or “Not Calibrated” message if no pH calibration was performed.

Note: If the reading is out of range, “-----” will be displayed

on the LCD.

and then to select

pH Measure

mode

DIRECT / AUTOHOLD MEASUREMENT

To measure pH of a sample using the Direct/AutoHold reading mode:

• Press (for the selected channel – HI 4222 only).

• Select the Direct/AutoHold reading mode (see pH Setup for details, page 20).

• Submerge the electrode tip and the temperature probe approximately 4 cm (1½”) into the sample to be tested. Allow time for the electrode to stabilize.

• The measured pH value will be displayed on the LCD. If pressing

until the stability criterion is reached. The pH value will be frozen on the LCD, along with “AutoHold” indicator.

and then to select

, the “AutoHold” indicator will start blinking on the LCD

pH Measure

mode

Measure

• To return to normal

Note: If the reading is out of range, “-----” will be displayed on the LCD.

Outside Cal Range feature warns the user if the current reading is

out of the calibrated area. The calibrated area is that part of the pH range in which the calibration point assures an accurate reading. If the reading is taken out of the calibration area, the “Outside Cal Range” message will start blinking on the LCD. The calibrated area is calculated in according with the pH resolution used during the reading. To avoid having this message, the calibration points have to be well distributed in the desired measurement range.

If measurements are taken successively in different samples, it is recommended to rinse the electrode thoroughly with deionized water or tap water and then with some of the next sample to prevent cross-contamination and to condition the electrode before immersing it into the sample solution.

The pH reading is affected by temperature. In order to measure the pH accurately, the temperature effect must be compensated. To use the Automatic Temperature Compensation (ATC) feature, connect and submerge the HI 7662-T temperature probe into the sample as close as possible to the electrode and wait for a few seconds.

If the temperature of the sample is known, Manual Temperature Compensation (MTC) can be performed by disconnecting the temperature probe.

Notes: • For single channel pH measurements (HI 4221) “MTC” or “ATC” indicators will be displayed on the LCD,

while for dual channel pH measurements (HI 4222) “MTC” or “ATC1”/”ATC2” indicators will be displayed, depending on the temperature compensation mode and selected channel.

• For mV/Rel mV measurements “NO PROBE” or “TEMP” indicators will be displayed on the LCD (HI 4221 only), respectively “NoProbe” or “TEMP1”/”TEMP2” indicators (HI 4222 only) for mV/Rel mV/ISE measurements, depending on the temperature compensation mode and selected channel.

• When in MTC mode, the temperature can be modified by pressing

for mV/

only). The temperature value can be ajusted with

to save the new temperature value or press to return to

• When in ATC mode for pH, respectively TEMP for mV/Rel mV, “-----” will be displayed on the LCD if the measured temperature is under or over temperature range (–20.0 ºC to 120.0 ºC).

mode press .

Rel mV Measure

mode (HI 4221 only) if the Reading Mode option is Direct (HI 4222

for

pH Measure

or from –20.0 ºC to 120.0 ºC. Press

Measure

mode and

mode.

mV & Relative mV MEASUREmV & Relative mV MEASURE

mV & Relative mV MEASURE

mV & Relative mV MEASUREmV & Relative mV MEASURE

MENTMENT

MENT

MENTMENT

mV/ORPmV/ORP

mV/ORP

mV/ORPmV/ORP

Oxidation-reduction potential (ORP) measurements provide the quantification of the oxidizing or reducing power of the tested sample.

To correctly perform a redox measurement, the surface of the ORP electrode must be clean and smooth.

DIRECT MEASUREMENT

To measure the mV of a sample using the Direct reading mode:

• Press

• Select the Direct reading mode (see mV Setup for details, page 32).

• Submerge the tip of the ORP electrode (4 cm/1½”) into the

• The instrument will display the measured mV value on the LCD. Note: If the reading is out of range, “-----” will be displayed

DIRECT / AUTOHOLD MEASUREMENT

To measure mV of a sample using the Direct/AutoHold reading mode:

• Press

• Select the Direct/AutoHold reading mode (see mV Setup for

• Submerge the tip of the ORP electrode approximately 4

• The measured mV value will be displayed on the LCD. If

• To return to normal Note: If the reading is out of range, “-----” will be displayed

MEASUREMENTS MEASUREMENTS

MEASUREMENTS

MEASUREMENTS MEASUREMENTS

and then to enter

(for the selected channel – HI 4222 only).

sample to be tested and allow a few seconds for the reading to stabilize.

on the LCD.

and then to select

(for the selected channel – HI 4222 only).

details, page 32).

cm (1½”) into the sample to be tested and allow a few seconds for the reading to stabilize.

pressing on the LCD until the stability criterion is reached. The mV value

will be frozen on the LCD, along with “AutoHold” indicator.

on the LCD.

, the “AutoHold” indicator will start blinking

Measure

mode press .

mV Measure

mode

Relative mVRelative mV

Relative mV

Relative mVRelative mV

To measure the Relative mV of a sample:

• Press

Measure

• The instrument will display the measured Relative mV value on the LCD, together with a short GLP information about the last calibration or “Not Calibrated” message if no Rel mV calibration was performed (no Rel mV offset set).

Notes: • If the measured mV potential is out of range, “-----”

• If pressing while in

MEASUREMENTS MEASUREMENTS

MEASUREMENTS

MEASUREMENTS MEASUREMENTS

and then to enter

mode.

will be displayed on the LCD.

Relative mV

Relative mV Measure

mode, the Relative mV offset screen will be displayed on the LCD. Press Relative mV or use Relative mV value and then press current Relative mV. Press return to

• Before performing a Rel mV calibration, make

Relative mV Measure

sure that the electrode is immersed into the sample to be measured.

to clear the existing

or to adjust the

to save the

at any time to

mode.

ISE CALIBRATION & MEASUREISE CALIBRATION & MEASURE

ISE CALIBRATION & MEASURE

ISE CALIBRATION & MEASUREISE CALIBRATION & MEASURE

(HI 4222 only)(HI 4222 only)

(HI 4222 only)

(HI 4222 only)(HI 4222 only)

ISE CALIBRATIONISE CALIBRATION

ISE CALIBRATION

ISE CALIBRATIONISE CALIBRATION

For greatest accuracy, it is recommended to calibrate the instrument frequently. The instrument should also be recalibrated whenever “No ISE Calibration” or “ISE Calibration Expired” message appears on the LCD, in the Reminder messages area.

Due to electrode conditioning time, the electrode must be kept immersed a few seconds to stabilize. The user will be guided step by step during calibration with easy to follow messages on the display. This will make the calibration a simple and error-free procedure.

PREPARATION

Pour small quantities of the standard solutions into clean beakers. If possible, use plastic beakers to minimize any EMC interferences.

For accurate calibration and to minimize cross-contamination, use two beakers for each standard solution. One for rinsing the electrode and one for calibration.

Note: For accurate measurements, add the appropriate ISAB (Ionic Strength Adjustment Buffer) to the

calibration standards.

CALIBRATION PROCEDURE

Up to five-point calibration is possible, using five memorized standard solutions: 0.1, 1, 10, 100, 1000 ppm and 5 custom solutions.

The ISE calibration and measurement can be performed with or without temperature compensation. If the temperature compensation option is enabled, the isopotential point of the electrode must be set in ISE Setup in order to perform correct concentration measurements.

Before calibrating, make sure that the appropriate Electrode Type has been selected in ISE Setup according to the measured Ion/compound.

ISE Calibration screen description

MENTMENT

MENT

MENTMENT

Two standard entry types are available: ManualSelection and Custom Standard. The default option is Manual Selection.

A. To calibrate the instrument using Manual Selection standard entry type:

• Press cleared by pressing Note: It is very important to clear calibration history when a new electrode is used

• Add ISAB to all standard solutions.

• Immerse the Ion Selective Electrode and the temperature probe approximately 4 cm (1½”) into the less concentrated standard solution and stir gently.

• Select the used standard solution concentration with “Please wait...” message will appear on the LCD until the reading is stable or

the concentration is validated.

Note: When in ATC mode, if pressing

concentration value can be ajusted using concentration value.

• If the standard solution concentration is validated, calibration. The calibration point value will be added to the Calibrated Standards section.

• The “Please wait...” message will appear on the LCD for 10 seconds and until the reading is stable, time in which immerse the ion selective electrode and the temperature probe into the next standard solution and

follow the above procedure or press

. If the instrument was calibrated before and calibration was not cleared, the old calibration can be

. After 10 seconds, will no longer be available.

because most errors and warning messages that appear during calibration depend on calibration history.

or . The

a pop-up menu will be displayed on the LCD in which the

or . Press to save the new

will appear on the LCD. Press to update

to exit calibration.

B. To calibrate the instrument using Custom Standard entry type:

• Press . If the instrument was calibrated before and calibration was not cleared, the old calibration can be cleared by pressing Note: It is very important to clear calibration history when a new electrode is

used because most errors and warning messages that appear during calibration depend on calibration history.

• Add ISAB to all standard solutions.

• Immerse the Ion Selective Electrode and the temperature probe approximately 4 cm (1½”) into the less concentrated standard solution and stir gently.

• When the stability condition is reached and 10 seconds elapsed, a pop-up menu will appear on the LCD in which the standard concentration value can be set.

• Press

store the set concentration value.

/ to select next/previous entry to be edit. Press and use or

to set the desired value. Press to save the modified value and then press to

. After 10 seconds, will no longer be available.

• If the standard solution concentration is validated, calibration. The calibration point value will be added to the Calibrated Standards section.

• The “Please wait...” message will appear on the LCD until the reading is stable and 10 seconds elapsed, time in which immerse the Ion Selective Electrode and the temperature probe into the next standard solution

and follow the above procedure or press

Notes: • The new added calibration point will replace an old

one if the difference between them is less than 20% of the standard solution.

• If the existing stored calibration is full (five calibration points), a pop-up menu will be displayed on the

LCD in which you can select with the standard solution you want to replace with the current one. Press calibrated point and then press bration with the new standard solution.

• If the isopotential point of the electrode is unknown, the ion calibration and measurements can be performed only without temperature compensation (see ISE Setup, Temperature option for details, page 33). When the temperature compensation option is disabled, at least a two-point calibration must be performed in order to perform ISE measurements. Otherwise, “-----” will appear on the LCD.

to delete the selected

will appear on the LCD. Press to update

to exit calibration.

to update cali-

• When in MTC mode, if pressing ing ISE calibration and while a standard solution is

selected, a pop-up menu will be displayed on the LCD in which the concentration and the temperature value can be ajusted by pressing

or keys. Press to save the modified value and then previous value to be adjusted.

CALIBRATION MESSAGES

• Wrong standard solution. Please check the standard solution: this message appears when the

difference between the ppm reading and the value of the selected standard solution concentration (ppm) is significant. If this message is displayed, check if you have selected the appropriate calibration standard.

/ to select next/

after enter-

and then

• Wrong new slope. Please check the standard solution: this message appears if the current slope

exceeds slope window (50% to 120% of default slope for the corresponding ion charge - see ISE Theory section for details, page 54). Recalibrate the instrument using fresh standards.

• Wrong old slope. Press <Clear Cal> to clear old calibration: this message appears as a result of

an erroneous slope condition. Press

• Difference between standards temperature is too high. Press <Accept> to update the calibration or clear old calibration: this message appears when the difference between two standards temperature is greater than 5 ºC. Recalibrate the instrument while paying attention to the standards temperature.

to clear old calibration and restart calibration.

ISE MEASUREISE MEASURE

ISE MEASURE

ISE MEASUREISE MEASURE

Make sure the instrument has been calibrated before taking ISE measurements. When using one of the incremental methods for measurement and no or only a one-point ISE calibration was

performed, a warning message will be displayed on the LCD, notifying the user that at least a two-point ISE calibration must be performed.

For accurate measurements, add the appropriate ISAB (Ionic Strength Adjustment Buffer) to both samples and standards, if necessary. If ISAB is added to the calibration standards, it is important to add ISAB also to the samples to be measured.

DIRECT MEASUREMENT

To measure the concentration of a sample using the Direct reading mode:

• Press selected channel.

• Select the Direct reading mode (see ISE Setup for details, page 33).

• Add ISAB to the sample solution.

• Submerge the Ion Selective Electrode tip and the temperature probe approximately 4 cm (1½”) into the sample to be tested. Allow time for the electrode to stabilize.

• The measured concentration value will be displayed on the LCD in the selected units.

Note: If the reading is out of range, “-----” will be displayed

on the LCD.

MENTMENT

MENT

MENTMENT

and then to select

ISE Measure

mode for the

DIRECT/AUTOHOLD MEASUREMENT

To measure the concentration of a sample using the Direct/AutoHold reading mode:

• Press

• Select the Direct/AutoHold reading mode (see ISE Setup for details, page 33).

and then to select

ISE Measure

mode for the selected channel.

• Add ISAB to the sample solution.

• Submerge the Ion Selective Electrode tip and the temperature probe approximately 4 cm (1½”) into the sample to be tested. Allow time for the electrode to stabilize.

• The measured concentration value will be displayed on the LCD. If pressing the LCD until the stability criterion is reached. The concentration

value will be frozen on the LCD, along with “AutoHold” indicator.

• To return to normal

Note: If the reading is out of range, “-----” will be displayed

on the LCD.

KNOWN ADDITION

To measure the concentration of a sample using the Known Addition incremental method:

• Press for the selected channel.

• Select the Known Addition method (see ISE Setup for details, page 33).

• Press method will be displayed on the LCD in which the user is notified

to add the appropriate ISA Buffer Volume (if different from 0 mL) to the sample and to immerse the electrode into the Sample Volume. The method parameters are also displayed on the LCD.

• Press

press parameter value. Press and then press

• Make sure that the set parameters values are the used ones and submerge the Ion Selective Electrode tip approximately 4 cm (1½”) into the sample to be tested.

• Press

, the “AutoHold” indicator will start blinking on

Measure

mode press .

and then to select

to start the measurement. The first step of the

to set the method parameters. Press /

to select next/previous parameter to be edit, then

and use or to set the desired

to save the modified value

to exit method parameters edit menu.

to take the first mV reading.

ISE Measure

mode

• When the reading is stable, press will be displayed on the LCD in which the user is notified to add the Standard Volume of set concentration

to the sample. The method parameters are also displayed on the LCD.

• Press

• When the reading is stable, press second mV reading. The ISE measurement results will be

displayed on the LCD.

• Press Report or press

• If pressing and the sample concentration will be recalculated.

• Press

Note: Press

return to

KNOWN SUBTRACTION

To measure the concentration of a sample using the Known Subtraction incremental method:

• Press

• Select the Known Subtraction method (see ISE Setup for details, page 33).

• Press user is notified to add the appropriate ISA Buffer Volume (if different from 0 mL) to the sample and to immerse

the electrode into the Sample Volume. The method parameters are also displayed on the LCD.

• Press to be edit, then press

Note: For the Known Subtraction method, the stoichiometric ratio (factor) between standard and sample

must also be set in order to take accurate measurements.

• Make sure that the set parameters values are the used ones and submerge the Ion Selective Electrode tip approximately 4 cm (1½”) into the sample to be tested.

• Press

to change the desired method parameters as indicated in the first step of the method. to take the second mV reading.

to log the current results into a ISE Method

to return to

, the method parameters can be changed

to start another measurement.

at any time to stop the measurement and

ISE Measure

and then to select

to start the measurement. The first step of the method will be displayed on the LCD in which the

to set the method parameters. Press / to select next/previous parameter

to save the modified value and then press to exit method parameters edit menu.

to take the first mV reading.

mode.

and use or to set the desired parameter value. Press

to store the first mV reading. The second step of the method

to store the

ISE Measure

mode.

ISE Measure

mode for the selected channel.

• When the reading is stable, press will be displayed on the LCD in which the user is notified to add the Standard Volume of set concentration

to the sample. The method parameters are also displayed on the LCD.

to store the first mV reading. The second step of the method

• Press

• When the reading is stable, press will be displayed on the LCD.

• Press to log the current results into a ISE Method Report or press to return to

Measure

• If pressing recalculated.

• Press

Note: Press

ANALYTE ADDITION

To measure the concentration of a sample using the Analyte Addition incremental method:

• Press

• Select the Analyte Addition method (see ISE Setup for details, page 33).

• Press which the user is notified to add the appropriate ISA Buffer Volume (if different from 0 mL) to the standard

and to immerse the electrode into the Standard Volume of set concentration. The method parameters are also displayed on the LCD.

• Press to be edit, then press

• Make sure that the set parameters values are the used ones and submerge the Ion Selective Electrode tip approximately 4 cm (1½”) into the standard solution.

• Press

to change the desired method parameters as indicated in the first step of the method. to take the second mV reading.

to store the second mV reading. The ISE measurement results

mode.

, the method parameters can be changed and the sample concentration will be

to start another measurement.

at any time to stop the measurement and return to

and then to select

to start the measurement. The first step of the method will be displayed on the LCD in

to set the method parameters. Press / to select next/previous parameter

and use or to set the desired parameter value. Press

to save the modified value and then press to exit method parameters edit menu.

to take the first mV reading.

ISE Measure

mode for the selected channel.

ISE Measure

mode.

ISE

• When the reading is stable, press will be displayed on the LCD in which the user is notified to add the Sample Volume to the standard

solution. The method parameters are also displayed on the LCD.

• Press

• When the reading is stable, press will be displayed on the LCD.

• Press

to change the desired method parameters as indicated in the first step of the method. to take the second mV reading.

to log the current results into a ISE Method Report or press to return to

to store the first mV reading. The second step of the method

to store the second mV reading. The ISE measurement results

ISE Measure

mode.

• If pressing recalculated.

• Press

Note: Press

ANALYTE SUBTRACTION

To measure the concentration of a sample using the Analyte Subtraction incremental method:

• Press

• Select the Analyte Subtraction method (see ISE Setup for details, page 33).

• Press which the user is notified to add the appropriate ISA Buffer Volume (if different from 0 mL) to the standard

and to immerse the electrode into the Standard Volume of set concentration. The method parameters are also displayed on the LCD.

• Press to be edit, then press

to save the modified value and then press to exit method parameters edit menu.

Note: For the Analyte Subtraction method, the stoichiometric ratio (factor) between standard and sample

must also be set in order to take accurate measurements.

• Make sure that the set parameters values are the used ones and submerge the Ion Selective Electrode tip approximately 4 cm (1½”) into the standard solution.

• Press

, the method parameters can be changed and the sample concentration will be

to start another measurement.

at any time to stop the measurement and return to

and then to select

to start the measurement. The first step of the method will be displayed on the LCD in

to set the method parameters. Press / to select next/previous parameter

and use or to set the desired parameter value. Press

to take the first mV reading.

ISE Measure

mode for the selected channel.

ISE Measure

mode.

• When the reading is stable, press will be displayed on the LCD in which the user is notified to add the Sample Volume to the standard

solution. The method parameters are also displayed on the LCD.

• Press

• When the reading is stable, press will be displayed on the LCD.

• Press to log the current results into a ISE Method Report or press to return to

Measure

• If pressing

• Press

Note: Press

to change the desired method parameters as indicated in the first step of the method. to take the second mV reading.

mode.

, the method parameters can be changed and the sample concentration will be recalculated.

to start another measurement.

at any time to stop the measurement and return to

to store the first mV reading. The second step of the method

to store the second mV reading. The ISE measurement results

ISE Measure

mode.

ISE

ISE THEORYISE THEORY

ISE THEORY

ISE THEORYISE THEORY

An Ion Selective Electrode (ISE) is an electrochemical sensor that changes voltage with the activity or concentration of ions in solutions. The change in voltage is a logarithmic relationship with concentration and is expressed by the Nernst equation:

where: E - the measured voltage;

- standard voltage and other standard system voltages;

a - the activity of the ion being measured; S - the Nernst slope factor and is derived from thermodynamic principles:

R - the universal gas constant (8.314 J*K

-1

*mol-1);

T - the temperature in degrees Kelvin; F - the Faraday’s constant (96,485 C*mol

-1

);

n - the ion charge.

The slope may be positive or negative depending upon the ion charge (n).

SEICEPS

noitactnelavonoM61.95+

noinatnelavonoM61.95–

noitactnelaviD85.92+

noinatnelaviD85.92–

EPOLS

)edaced/Vm(

Activity and concentration are related by an “activity coefficient”, expressed as:

where: a - the activity of the ion being measured;

- the activity coefficient;

C - the concentration of the ion being measured.

In very dilute solutions

approaches 1 so activity and concentration are the same.

Actual samples that are more concentrated have much smaller activity coefficients ( <1). The addition of an inert background salt to standards and samples stabilizes the activity coefficient so that concentration measurements may be made directly. Hanna’s Ionic Strength Adjustment Buffer (ISAB) formulations also may optimize pH, and complex interferences in addition to standardizing the ionic strength.

The Nernst equation can be rewritten:

ION SELECTIVE ANALYSIS METHODS

Direct AnalysisDirect Analysis

Direct Analysis

Direct AnalysisDirect Analysis

This method is a simple procedure for measuring multiple samples. It should only be used in the linear working regions of the sensor. A direct reading instrument such as the HI 4222 determines concentration of the unknown by a direct reading after calibrating the instrument with the standards. The instrument is calibrated as described in “ISE CALIBRATION & MEASUREMENTS” section, with two or more freshly made standards that are in the measurement range of the unknowns. Ionic strength adjustment is made to samples and standards. Unknowns are measured directly by the instrument. At lower concentrations, in non-linear regions of the electrode response, multiple calibration points will extend measurements to a practical detection limit. Calibrations must be performed more frequently in these cases.

Incremental MethodsIncremental Methods

Incremental Methods

Incremental MethodsIncremental Methods

Incremental methods are useful for the measurement of samples whose constituents are variable or concentrated. Incremental techniques can reduce errors from such variables as temperature, viscosity, or pH extremes and will provide indirect analysis of ions for which there is no ISE sensor for a direct measurement. There are four different incremental methods for sample measurement. They are Known Addition, Known Subtraction, Analyte Addition and Analyte Subtraction. HI 4222 allows the analyst to use these techniques as a simple routine procedure thus eliminating calculations or tables. The method once set up can be used for repetitive measurements on multiple samples.

Known Addition and Known Subtraction

With

Known addition, same ion. mV are taken before and after the standard addition. From the mV the sample concentration is determined.

With Known subtraction, with the measured ion in the sample in a known manner thus removing measured ions from the solution. From the change in mV the concentration of the sample is determined.

standard is added

to a sample being measured. The standard and sample contain the

a known standard is added to an ionic sample

being measured. The standard reacts

where: C

C V V

and V

- the sample concentration;

SAMPLE

- the standard concentration;

STD

- the sample volume;

SAMPLE

- the standard volume;

STD

= V

SAMPLE

+ V

STD

Example 1 You have sulfide samples and you are adding

. The reaction is:

One mole sulfide sample reacts with 2 moles silver standard (

Example 2 You have sulfide samples and you are adding

. The reaction is:

∆E - the difference of potential from the electrode;

S - the electrode slope, determined in a

previous calibration;

- the stoichiometric ratio between sample

and standard;

= ½).

One mole sulfide sample reacts with 1 mole lead standard (

= 1).

Analyte Addition and Analyte Subtraction

Analyte Addition and Subtraction are variations of the previous two methods. With Analyte Addition,

sample (analyte) is added

to an ion standard being measured. The standard and sample contain the same ion. mV are taken before and after the sample addition. From the mV the analyte concentration is determined.

With Analyte Subtraction,

sample (analyte) is added to an ion standard

being measured. The analyte reacts with the measured ion in a known manner thus removing measured ions from the solution. From the change in mV the concentration of the analyte is determined.

where: C

C V V

and V

- the sample concentration;

SAMPLE

- the standard concentration;

STD

- the sample volume;

SAMPLE

- the standard volume;

STD

= V

SAMPLE

+ V

STD

∆E - the difference of potential from the electrode;

S - the electrode slope, determined in a

previous calibration;

- the stoichiometric ratio between sample

and standard;

LOGGINGLOGGING

LOGGING

LOGGINGLOGGING

This feature allows the user to log pH, mV (or ISE - HI 4222 only) measurements, together with temperature automatically. The logging behaviour is dependent on the Logging Type and Reading Mode options from the appropriate unit setup.

The Logging Data Configuration options from the appropriate unit setup must be set first in order to be saved into the log report.

The maximum number of logged records is 5000/lot, the maximum logging time is 24h and up to 100 lots can be saved.

Regarding data logging, the available logging modes are shown in the table below:

edoMgniggoLepyTgniggoLedoMgnidaeR

1 citamotuAtceriD

2 citamotuAdloHotuA/tceriD

3 launaMtceriD

4 launaMdloHotuA/tceriD

5 dloHotuAdloHotuA/tceriD

LOGGING MODE 1

This logging mode can be used to monitor a chemical reaction (e.g. biochemical processes). By choosing this logging mode,

Note: For HI 4222, the

will be available in

or will be available in multichannel

Measure

mode.

Measure

mode, depending

on the focused channel.

To log data using this mode:

• Press

while in

Measure

mode to start the logging

session. The “Logging” and the Sampling Period indicators will be displayed on the LCD and data will be stored at the set sampling period.

Note: While automatic logging is running, the measured unit

setup is not available. A warning message will be displayed on the LCD if the setup is accessed.

• If accessing Graph option while logging, the online graph can

be visualized on the LCD (see Display Mode section for details, page 11).

• If accessing Log History option while logging, last logged data can be visualized on the LCD (see Display

Mode section for details, page 11).

• To stop the logging session, press

. The Log Save screen will be displayed in which the

logged lot parameters can be set:

• Press sampling or press the displayed format.

• Press

time or the log sampling. Press current value and use

next/previous parameter.

Note: The minimum log sampling which can be set is calcu-

lated related to the logging time thus the 5000 records/lot not to be exceeded (e.g. for a 50.000 seconds logging time, the minimum log sampling will be 10 seconds).

• Press press configuration. While the instrument is saving the data,

a “Please wait...” pop-up message will be displayed on the LCD.

Note: For larger logged lots, the saving time can be up to

several minutes.

to adjust the log interval and/or the log

to save the current log in

to enter log interval edit menu and use

or to adjust the logging start/stop

to exit log interval edit menu and then

to save the current log with the new

or /

to save the

or to adjust

LOGGING MODE 2

This logging mode can be used for multiple samples measurement. By choosing this logging mode,

will be available in

Note: For HI 4222, the

mode, depending on the focused channel.

To log data using this mode:

• Press the LCD by pressing frozen on the LCD until returning to normal logging mode by pressing

while in

Measure

mode.

or and or will be available in multichannel

Measure

mode to start the logging session. When the measured value is frozen on

and the stability criterion is reached, the logged value is the one that has been

and

Measure

The “Logging”, sampling period and “AutoHold” indicators will be displayed on the LCD.

Note: While automatic logging is running, the measured unit

setup is not available. A warning message will be displayed on the LCD if the setup is accessed.

• To store another frozen value, press

• To stop the logging session, press or /

LOGGING MODE 3

This logging mode can be used for any sample measurements. By choosing this logging mode, be available in

Note: For HI 4222,

To log data using this mode:

• Press record. The “Logged” indicator will be displayed on the LCD.

• The records will be stored in one lot. In order to change the logging lot, see the measured unit option, New Lot generation.

Measure

multichannel channel.

while in

mode.

Measure

mode, depending on the focused

Measure

mode to manually log a

again.

will be available in

Setup

for details, Log

will

LOGGING MODE 4

This logging mode can be used for multiple samples measurement. By choosing this logging mode, and will be available in

Note: For HI 4222,

Measure

mode, depending on the focused channel.

To log data using this mode:

• Press was pressed. When the measured value is frozen on the LCD by pressing

reached, the logged value is the one that has been frozen on the LCD.

while in

Measure

mode.

or and or will be available in multichannel

Measure

mode to manually log a record. Each value is logged at the time when the key

and the stability criterion is

• To store another frozen value, press

• The records will be stored in one lot. In order to change the logging lot, see the measured unit details, Log option, New Lot generation.

LOGGING MODE 5

This logging mode can be used for multiple samples measurement. By choosing this logging mode, and will be available in

Measure

to return to normal logging mode and then again.

mode.

Setup

for

Notes: • For HI 4222, the

Measure

mode, depending on the focused channel.

• If the Reading Mode option is set as Direct and the Logging Mode 5 session is started, a warning pop-up will be displayed on the LCD, informing the user that the Reading Mode option must be set as Direct/AutoHold in order to use this logging mode.

To log data using this mode:

• Press while in frozen on the LCD, after

• To store another frozen value, press

• To stop the logging session, press or / .

Notes: • For the automatic logging, if the maximum logging time (24h) has been reached, a warning pop-

up will be displayed on the LCD in order to stop the current log and start another one in a new lot.

• If 100 lots have been saved or maximum 5000 records have been manually stored, a warning pop-up will be displayed on the LCD in order to delete one lot or to select a new lot for the manual logging to log other records.

LOG RECALL

This feature allows the user to view all stored data. If no data were logged, the “No records were found” message will be displayed on the LCD in the Log Recall screen. Otherwise, the instrument will display all the memorized lots in accordance with the selected option: Automatic Log, Manual Log or ISE Method Report (HI 4222 only).

To view the memorized data:

• Press

• Press be displayed in the Reminder messages area.

while in . The “Choose Log Report Type” message will

Measure

or and or will be available in multichannel

mode to start the logging session. The logged values are only the ones

was pressed and the stability criterion reached.

to return to normal logging mode and then again.

mode.

• Press

, or to select the desired Log

Report type. All logged lots for the selected Log Report type will be displayed on the LCD.

• To filter the displayed lots, press desired unit (

, or

and then the

– HI 4222 only).

Only the selected measurement unit lots will be displayed on the LCD.

• Select the desired lot with or and press

to display the logged data from the highlighted lot.

The “Please wait...” message will be displayed on the LCD for one second. The selected Logging Data Configuration options will be displayed on the LCD, together with GLP information (last calibration date and calibrated buffers/ standards) if a calibration has been performed on the selected mode, and the logged values (measured value, mV value, temperature value, temperature compensation mode and the logging time).

Note: For automatic logging only, it is possible to view the

plotted graph.

• Press

• By pressing

to display the graph.

it is possible to move the graph

along the X or Y axis with the arrow keys.

• If pressing

while the graph is displayed, the

zoom menu for the X and Y axes will be accessed. Press

, or / / /

to switch between the active zooming axes and then zoom in or out on the selected axis by pressing the appropriate virtual key.

• Press

to return to the previous menu at any time.

To delete lots:

• Press

while in

Log Recall

mode.

• Press Otherwise, press

• After selecting one of the deleting modes, use or

to delete the selected lot or all lots. The “Please wait...” message will be displayed on the LCD until the selected lot or all lots are deleted.

• Press and return to

• Press mode.

Note: Logged lots should also be deleted whenever “Please Delete Old Log Files” or “Low Data Logging Space”

message appears on the LCD, in the Reminder messages area.

Data transmission from the instrument to the PC can be done with the HI 92000 Windows® compatible software (optional). HI 92000 also offers graphing and on-line help feature.

Data can be exported to the most popular spreadsheet programs for further analysis. HI 4221 and HI 4222 instruments have two available serial interfaces: RS232 and USB. The desired serial

interface can be selected from the settings window of the HI 92000 software. If choosing the RS232 serial interface, use the optional Hanna HI 920010 cable connector to connect your

instrument to a PC. Make sure that your instrument is switched off and then plug one connector to the instrument RS232 socket and the other one to the serial port of your PC.

Note: Other cables than HI 920010 may use a different configuration. In this case, communication between

instrument and PC may not be possible.

If choosing the USB serial interface, use a standard USB cable to connect your instrument to the PC. For both serial interfaces, make sure that the instrument and the HI 92000 software have the same baud rate

and the appropriate communication port.

or to access delete or delete all mode.

to return to

to select one lot and then press or

and then press to exit deleting mode

Log Recall

to exit

view mode.

Log Recall

mode and return to

view mode.

PC INTERFACEPC INTERFACE

PC INTERFACE

PC INTERFACEPC INTERFACE

Measure

H BUFFER TEMPERATUREH BUFFER TEMPERATURE

H BUFFER TEMPERATURE

H BUFFER TEMPERATUREH BUFFER TEMPERATURE

DEPENDENCEDEPENDENCE

DEPENDENCE

DEPENDENCEDEPENDENCE

Temperature has an effect on pH. The calibration buffer solutions are affected by temperature changes to a lower degree than normal solutions.

During calibration the instrument will automatically calibrate to the pH value corresponding to the measured or set temperature.

PMETSREFFUBHp

CºKºFº976.1000.3010.4268.6010.7771.9010.01454.21

037223 076.1270.3700.4289.6031.7954.9613.01973.31

587214 076.1150.3200.4949.6890.7193.9542.01871.31

0138205 176.1330.3000.4129.6070.7823.9081.01589.21

5188295 376.1910.3100.4798.6640.7372.9811.01997.21

0239286 576.1800.3400.4878.6720.7222.9260.01126.21

5289277 976.1000.3010.4268.6010.7771.9010.01054.21

0330368 386.1599.2710.4158.6899.6731.9269.9682.21

5380359 886.1199.2620.4248.6989.6801.9919.9821.21

04313401 396.1099.2730.4738.6389.6960.9188.9879.11

54813311 007.1099.2940.4438.6979.6040.9748.9438.11

05323221 707.1199.2260.4438.6879.6410.9718.9796.11

55823131 517.1399.2670.4638.6979.6099.8397.9665.11

06333041 427.1599.2190.4938.6289.6969.8377.9244.11

56833941 437.1899.2701.4448.6789.6849.8757.9323.11

07343851 447.1000.3321.4058.6399.6929.8647.9112.11

57843761 557.1200.3931.4758.6100.7019.8047.9401.11

08353671 767.1300.3651.4568.6010.7198.8837.9300.11

58853581 087.1200.3271.4378.6910.7178.8047.9809.01

09363491 397.1000.3781.4088.6920.7158.8847.9918.01

59863302 708.1699.2202.4888.6040.7928.8957.9437.01

During calibration the instrument will display the pH buffer value at 25 ºC.

ELECTRODE CONDITIONINGELECTRODE CONDITIONING

ELECTRODE CONDITIONING

ELECTRODE CONDITIONINGELECTRODE CONDITIONING

& MAINTENANCE& MAINTENANCE

& MAINTENANCE

& MAINTENANCE& MAINTENANCE

PREPARATION PROCEDURE

Remove the protective cap of the pH electrode. DO NOT BE ALARMED IF SALT DEPOSITS ARE PRESENT. This is normal with electrodes. They will disappear

when rinsed with water. During transport, tiny bubbles of air may form inside the glass bulb affecting proper functioning of the electrode.

These bubbles can be removed by “shaking down” the electrode as you would do with a glass thermometer. If the bulb and/or junction is dry, soak the electrode in HI 70300 or HI 80300

For refillable electrodes:For refillable electrodes:

For refillable electrodes:

For refillable electrodes:For refillable electrodes:

If the filling solution (electrolyte) is more than 2½ cm (1”) below the fill hole, add HI 7082 or HI 8082 3.5M KCl Electrolyte Solution for double junction or HI 7071 or HI 8071 3.5M KCl+AgCl Electrolyte Solution for single junction electrodes.

For faster response, unscrew the fill hole screw during measurements.

Storage Solution for at least one hour.

®®

For AmpHelFor AmpHel

For AmpHel

For AmpHelFor AmpHel

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electrodes: electrodes:

electrodes:

electrodes: electrodes:

If the electrode does not respond to pH changes, the battery run down and the electrode should be replaced.

MEASURE

Rinse the pH electrode tip with distilled water. Immerse the tip (bottom 4 cm /1½”) in the sample and stir gently for a few seconds.

For a faster response and to avoid cross-contamination of the samples, rinse the electrode tip with a few drops of the solution to be tested, before taking measurements.

STORAGE PROCEDURE

To minimize clogging and assure a quick response time, the glass bulb and the junction of pH electrode should be kept moist and not allowed to dry out.

Replace the solution in the protective cap with a few drops of HI 70300 or HI 80300 Storage Solution or, in its absence, Filling Solution (HI 7071 or HI 8071 for single junction and HI 7082 or HI 8082 for double junction electrodes). Follow the Preparation Procedure on page 64 before taking measurements.

Note: NEVER STORE THE ELECTRODE IN DISTILLED OR DEIONIZED WATER.

PERIODIC MAINTENANCE

Inspect the electrode and the cable. The cable used for connection to the instrument must be intact and there must be no points of broken insulation on the cable or cracks on the electrode stem or bulb. Connectors must be perfectly clean and dry. If any scratches or cracks are present, replace the electrode. Rinse off any salt deposits with water.

pH Probe Maintenance

For refillable electrodes:For refillable electrodes:

For refillable electrodes:

For refillable electrodes:For refillable electrodes: Refill the reference chamber with fresh electrolyte (HI 7071 or HI 8071 for single junction or HI 7082 or

HI 8082 for double junction electrodes). Allow the electrode to stand upright for 1 hour. Follow the Storage

Procedure above.

pH CLEANING PROCEDURE

•

General

•

Protein

•

Inorganic

•

Oil/grease

Soak in Hanna HI 7061 or HI 8061 General Cleaning Solution for approximately ½ hour. Soak in Hanna HI 7073 or HI 8073 Protein Cleaning Solution for 15 minutes. Soak in Hanna HI 7074 Inorganic Cleaning Solution for 15 minutes. Rinse with Hanna HI 7077 or HI 8077 Oil and Fat Cleaning Solution.

IMPORTANT: After performing any of the cleaning procedures, rinse the electrode thoroughly with distilled water, refill the reference chamber with fresh electrolyte (not necessary for gel-filled electrodes) and soak the electrode in HI 70300 or HI 80300 Storage Solution for at least 1 hour before taking measurements.

TROUBLESHOOTING GUIDETROUBLESHOOTING GUIDE

TROUBLESHOOTING GUIDE

TROUBLESHOOTING GUIDETROUBLESHOOTING GUIDE

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TEMPERATURE CORRELATIONTEMPERATURE CORRELATION

TEMPERATURE CORRELATION

TEMPERATURE CORRELATIONTEMPERATURE CORRELATION

FOR FOR

FOR

FOR FOR

H SENSITIVE GLASSH SENSITIVE GLASS

H SENSITIVE GLASS

H SENSITIVE GLASSH SENSITIVE GLASS

The resistance of glass electrodes partially depends on the temperature. The lower the temperature, the higher the resistance. It takes more time for the reading to stabilize if the resistance is higher. In addition, the response time will suffer to a greater degree at temperatures below 25 ºC (77 ºF).

Since the resistance of the pH electrode is in the range of 50 – 200 Mohm, the current across the membrane is in the pico Ampere range. Large currents can disturb the calibration of the electrode for many hours.

For these reasons high humidity environments, short circuits and static discharges are detrimental to a stable pH reading.

The pH electrode’s life also depends on the temperature. If constantly used at high temperatures, the electrode life is drastically reduced.

Typical Electrode Life

Ambient Temperature 1 – 3 years 90 ºC (194 ºF) Less than 4 months 120 ºC (248 ºF) Less than 1 month

Alkaline Error

High concentrations of sodium ions interfere with readings in alkaline solutions. The pH at which the interference starts to be significant depends upon the composition of the glass. This interference is called alkaline error and causes the pH to be underestimated. Hanna’s glass formulations have the indicated characteristics.

Sodium Ion Correction for the Glass at 20-25 ºC (68-77 ºF) Concentration pH Error

0.1 Mol L-1 Na

1.0 Mol L-1 Na

13.00

13.50

14.00

12.50

13.00

13.50

14.00

0.10

0.14

0.20

0.10

0.18

0.29

0.40

ACCESSORIESACCESSORIES

ACCESSORIES

ACCESSORIESACCESSORIES

pH BUFFER SOLUTIONS

HI 6001 pH 1.679 Buffer Solution, 500 mL bottle HI 6003 pH 3.000 Buffer Solution, 500 mL bottle HI 8004L pH 4.01 Buffer Solution in FDA approved bottle, 500 mL HI 6004 pH 4.010 Buffer Solution, 500 mL bottle HI 8006L pH 6.86 Buffer Solution in FDA approved bottle, 500 mL HI 6068 pH 6.862 Buffer Solution, 500 mL bottle HI 8007L pH 7.01 Buffer Solution in FDA approved bottle, 500 mL HI 6007 pH 7.010 Buffer Solution, 500 mL bottle HI 6091 pH 9.177 Buffer Solution, 500 mL bottle HI 8009L pH 9.18 Buffer Solution in FDA approved bottle, 500 mL HI 8010L pH 10.01 Buffer Solution in FDA approved bottle, 500 mL HI 6010 pH 10.010 Buffer Solution, 500 mL bottle HI 6124 pH 12.450 Buffer Solution, 500 mL bottle

ELECTRODE STORAGE SOLUTIONS

HI 70300L Storage Solution, 500 mL bottle HI 80300L Storage Solution in FDA approved bottle, 500 mL

ELECTRODE CLEANING SOLUTIONS

HI 70000P Electrode Rinse Sachets, 20 mL, 25 pcs HI 7061L General Purpose Solution, 500 mL bottle HI 7073L Protein Cleaning Solution, 500 mL bottle HI 7074L Inorganic Cleaning Solution, 500 mL bottle HI 7077L Oil & Fat Cleaning Solution, 500 mL bottle HI 8061L General Purpose Solution in FDA approved bottle, 500 mL HI 8073L Protein Cleaning Solution in FDA approved bottle, 500 mL HI 8077L Oil & Fat Cleaning Solution in FDA approved bottle, 500 mL

ELECTRODE REFILL ELECTROLYTE SOLUTIONS

HI 7071 3.5M KCl + AgCl Electrolyte, 4x30 mL, for single junction electrodes HI 7072 1M KNO

Electrolyte, 4x30 mL

HI 7082 3.5M KCl Electrolyte, 4x30 mL, for double junction electrodes HI 8071 3.5M KCl + AgCl Electrolyte in FDA approved bottle, 4x30 mL, for single junction electrodes HI 8072 1M KNO

Electrolyte in FDA approved bottle, 4x30 mL

HI 8082 3.5M KCl Electrolyte in FDA approved bottle, 4x30 mL, for double junction electrodes HI 8093 1M KCl + AgCl Electrolyte in FDA approved bottle, 4x30 mL

ORP PRETREATMENT SOLUTIONS

HI 7020L Test Solution 200-275 mV, 500 mL bottle HI 7021L Test Solution 240 mV, 500 mL bottle HI 7022L Test Solution 470 mV, 500 mL bottle

HI 7091L Reducing Pretreatment Solution, 500 mL HI 7092L Oxidizing Pretreatment Solution, 500 mL

pH ELECTRODES

All electrodes part numbers ending in B are supplied with a BNC connector and 1 m (3.3') cable, as shown below:

HI 1043B

Glass-body, double junction, refillable, combination pH electrode. Use: strong acid/alkali.

HI 1053B

Glass-body, triple ceramic, conic shape, refillable, combination pH electrode. Use: emulsions.

HI 1083B

Glass-body, micro, Viscolene, non-refillable, combination pH electrode. Use: biotechnology, micro titration.

HI 1131B

Glass-body, single junction, refillable, combination pH electrode. Use: general purpose.

HI 1330B

Glass-body, semimicro, single junction, refillable, combination pH electrode. Use: laboratory, vials.

HI 1331B

Glass-body, semimicro, single junction, refillable, combination pH electrode. Use: flasks.

HI 1230B

Plastic-body (PEI

Use: general, field.

), double junction, gel-filled, combination pH electrode.

HI 2031B

Glass-body, semimicro, conic, refillable, combination pH electrode. Use: semisolid products.

HI 1332B

Plastic-body (PEI

), double junction, refillable, combination pH electrode.

Use: general purpose.

HI 1413B

Glass-body, single junction, flat tip, Viscolene, non-refillable, combination pH electrode. Use: surface measurement.

FC 100B

Plastic-body (PVDF

), double junction, refillable, combination pH electrode.

Use: general purpose for food industry.

FC 200B

Plastic-body (PVDF

), open junction, conic, Viscolene, non-refillable, combination pH electrode.

Use: meat & cheese.

FC 210B

Glass-body, double junction, conic, Viscolene, non-refillable, combination pH electrode. Use: milk, yogurt.

FC 220B

Glass-body, triple-ceramic, single junction, refillable, combination pH electrode. Use: food processing.

FC 911B

Plastic-body (PVDF

), double junction, refillable with built-in amplifier, combination pH electrode.

Use: very high humidity.

ORP ELECTRODES

HI 3131B

Glass-body, refillable, combination platinum ORP electrode. Use: titration.

HI 3230B

Plastic-body (PEI

), gel-filled, combination platinum ORP electrode.

Use: general purpose.

HI 4430B

Plastic-body (PEI

), gel-filled, combination gold ORP electrode.

Use: general purpose.

Consult the Hanna General Catalog for more electrodes with screw-type or BNC connectors.

is registered Trademark of “General Electric Co.”

PEI PVDF® is registered Trademark of “Pennwalt Corp.”

EXTENSION CABLE FOR SCREW-TYPE ELECTRODES (SCREW TO BNC ADAPTER)

HI 7855/1 Extension cable 1 m (3.3') long HI 7855/3 Extension cable 3 m (9.9') long

HI 7855 SERIES CABLE CONNECTORS

CONNECTOR AND 3.0 mm (0.12") CABLE WITH BNC

CONNECT TO SCREW TYPE ELECTRODES

CONNECT TO THE

BNC SOCKET

OF THE METER

OTHER ACCESSORIES

HI 710005/8 Voltage adapter from 115 Vac / 12 Vdc 800 mA (USA plug) HI 710006/8 Voltage adapter from 230 Vac / 12 Vdc 800 mA (European plug) HI 76404N Electrode holder HI 8427 pH and ORP electrode simulator with 1 m (3.3') coaxial cable ending in female BNC

connectors

HI 931001 pH and ORP electrode simulator with LCD and 1 m (3.3') coaxial cable ending in female BNC

connectors

HI 7662-T Temperature probe with 1 m (3.3') cable HI 92000 Windows

compatible software

HI 920010 9 to 9-pin RS232 cable

RECOMMENDATIONS FOR USERS

Before using these products, make sure they are entirely suitable for the environment in which they are used. Operation of these instruments in residential areas could cause unacceptable interferences to radio and TV

equipment, requiring the operator to follow all necessary steps to correct interferences. The glass bulb at the end of the pH electrode is sensitive to electrostatic discharges. Avoid touching this glass

bulb at all times. During operation, ESD wrist straps should be worn to avoid possible damage to the electrode by electrostatic

discharges. Any variation introduced by the user to the supplied equipment may degrade the instruments’ EMC

performance. To avoid electrical shock, do not use these instruments when voltages at the measurement surface exceed

24 Vac or 60 Vdc. To avoid damage or burns, do not perform any measurement in microwave ovens.

Hanna Instruments reserves the right to modify the design, construction and appearance

of its products without advance notice.

SALES AND TECHNICAL SERVICE CONTACTSSALES AND TECHNICAL SERVICE CONTACTS

SALES AND TECHNICAL SERVICE CONTACTS

SALES AND TECHNICAL SERVICE CONTACTSSALES AND TECHNICAL SERVICE CONTACTS

Australia:

Tel. (03) 9769.0666 • Fax (03) 9769.0699

China:

Tel. (10) 88570068 • Fax (10) 88570060

Egypt:

Tel. & Fax (02) 2758.683

Germany:

Tel. (07851) 9129-0 • Fax (07851) 9129-99

Greece:

Tel. (210) 823.5192 • Fax (210) 884.0210

Indonesia:

Tel. (210) 4584.2941 • Fax (210) 4584.2942

Japan:

Tel. (03) 3258.9565 • Fax (03) 3258.9567

Korea:

Tel. (02) 2278.5147 • Fax (02) 2264.1729

Malaysia:

Tel. (603) 5638.9940 • Fax (603) 5638.9829

Singapore:

Tel. 6296.7118 • Fax 6291.6906

South Africa:

Tel. (011) 615.6076 • Fax (011) 615.8582

Taiwan:

Tel. 886.2.2739.3014 • Fax 886.2.2739.2983

Thailand:

Tel. 66.2619.0708 • Fax 66.2619.0061

United Kingdom:

Tel. (01525) 850.855 • Fax (01525) 853.668

USA:

Tel. (401) 765.7500 • Fax (401) 765.7575

For e-mail contacts and a complete list of Sales and Technical offices, please see

www.hannainst.com

MAN4222

10/06

Hanna Instruments HI 4221, HI 4222 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual