Operating Instructions

Mode d‘emploi

Instrucciones de manejo

SevenCompactTM

pH/Ion meter S220

English Français Español

Table of contents

1 	 Introduction	 5

2 	 Safety measures	 6

3 	 Installation	 8

3.1 	 Installing the electrode arm	 8

3.2 	 Connecting a sensor	 12

4 	 Operating the meter	 13

4.1 	 Backside layout	 13

4.1.1 	 Pin assignments RS232 connection	 13

4.2 	 The display	 14

4.3 	 Key controls	 16

4.4 	 Using the softkeys	 16

4.5 	 Selecting a measurement mode	 17

4.6 	 Navigating between menus	 17

4.7 	 Navigating within a menu	 17

4.8 	 Using the alphanumeric keypad	 17

4.8.1 	 Alphanumeric input	 17

4.8.2 	 Entering IDs / PIN	 18

4.8.3 	 Editing values in a table	 18

4.9 	 Calibration	 19

4.9.1 	 Running a one-point pH/ion calibration	 19

4.9.2 	 Running a multi-point pH/ion calibration	 19

4.10 	 Automatic buffer recognition	 20

4.11 	 Sample measurements	 20

4.12 	 Data transfer	 20

4.13 	 Temperature compensation	 21

5 	 Setup	 22

5.1 	 Menu structure of setup	 22

5.2 	 Sample ID	 22

5.3 	 User ID	 22

5.4 	 Stirrer	 23

5.5 	 Data Transfer Settings	 23

5.6 	 System settings	 24

5.7 	 Service	 26

5.8 	 Instrument self-test	 27

6 	 Menus and settings	 28

6.1 	 Menu structure of pH/ion	 28

6.2 	 Sensor ID/SN	 28

6.3 	 Calibration settings	 29

6.4 	 Measurement settings	 30

6.5 	 Endpoint formats	 32

Table of contents 3
6.6 	 Timed Interval Readings	 33

6.7 	 Temperature settings	 33

6.8 	 Measurement limits	 33

7 	 Data management	 34

7.1 	 Menu structure of data menu	 34

7.2 	 Measurement data	 34

7.3 	 Calibration data	 35

7.4 	 ISM data	 36

8 	 Maintenance	 38

8.1 	 Meter maintenance	 38

8.2 	 Electrode maintenance	 38

8.3 	 Disposal 38

8.4 	 Error messages	 39

8.5 	 Error limits	 41

9 	 Sensors, solutions and accessories	 42

10 	 Specifications	 44

11 	 Appendix	 45

11.1 	 Buffer tables	 45

11.1.1 	 Buffer group 1 (ref. 25 °C) METTLER TOLEDO US	 45

11.1.2 	 Buffer group 2 (ref. 25 °C) METTLER TOLEDO Europe (default buffer)	 45

11.1.3 	 Buffer group 3 (ref. 20 °C) Merck standard buffers	 46

11.1.4 	 Buffer group 4 (ref. 25 °C) DIN (19266)	 46

11.1.5 	 Buffer group 5 (ref. 25 °C) DIN (19267)	 46

11.1.6 	 Buffer group 6 (ref. 25 °C) JJG (Chinese)	 47

11.1.7 	 Buffer group 7 (ref. 25 °C) Technical Buffer	 47

11.1.8 	 Buffer group 8 (ref. 25 °C) JIS Z 8802 (Japanese)	 47

4 Table of contents
1 	Introduction

Thank you for purchasing this METTLER TOLEDO instrument. The SevenCompact Series is not only

a new generation of intuitive and easy-to-operate bench meters for reliable measurements, they

also provide extra security against mistakes and support your workflow in the laboratory.

Mistakes can be reduced to a minimum because of the following characteristics:

● New ISM® (Intelligent Sensor Management) technology: the meter automatically recognizes

the sensor and transfers the latest set of calibration data from the sensor chip to the meter. The

last five calibrations as well as the initial calibration certificate are also stored on the sensor

chip. These can be reviewed, transferred and printed. ISM® provides additional security and

helps eliminate mistakes.

● Multi-language graphical user interface on a large 4.3 inch display with intuitive menu

guidance, making the operating instructions primarily a source of reference.

● GLP and Routine mode for the needs of any operator: in the routine mode, the deletion of

data is prevented and changing those settings that would potentially jeopardize the collection

of reliable results, such as measurement settings, are blocked. This provides extra security

for routine daily work. Skilled workers are advised to employ the GLP mode to enjoy the

instruments’ powerful full functional range.

This instrument supports the workflow of a modern laboratory in all stages of the data collection

and archiving process:

● The electrode arm can be operated with one hand and moves perfectly straight up and down

to bring the electrode in the perfect position for the best measurement performance. This

allows faster measurements and poses less risk to tip over the sample vessel and/or damage

the head of the sensor!

● Only one keypress required: READ starts a measurement and CAL a calibration. It’s so easy!

● Easy switching between the normal view and the uFocusTM. The normal view has all the

measurement parameters and IDs on the display to provide you an instant complete overview.

In the uFocusTM only the most important information is shown in large digits, such as mea

surement value and temperature. This enables you to focus completely on the measurement,

without getting distracted by information that is not relevant to you.

● Easy toggling with the MODE soft key between the various measurement parameters either

before or during a measurement.

● Versatile data archiving options: print data, export data to a USB-stick, or send data to a PC

with LabX direct software!

● Versatile data entry procedures: Enter sample / user and sensor IDs either directly on the

instrument, or use a barcode reader or USB-Keyboard to increase efficiency.

At METTLER TOLEDO we are committed to providing you instruments of highest quality and we do

all we can to support you in maximizing the lifetime of your instrument:

● IP54 rating – water and dust protection: we have designed our instrument in such way, that

it withstands drops of aqueous solutions on the housing and connections. This not only pro

vides extra protection, but also allows easy cleaning of the instrument with a damp cloth.

● Rubber plugs and protective cover provide extra security against dust and spills of aqueous

solutions. Just keep the plug attached to the connections and cover the instrument with the

transparent protective cover when not in use.

Have fun and many reliable measurements with our Seven Compact series of pH, Ion and conduc

tivity meters!

Introduction 5
2 	Safety measures

Measures for your protection

Risk of explosion

● Never work in an environment subject to explosion hazards! The housing

of the instrument is not gas tight (explosion hazard due to spark forma

tion, corrosion caused by the ingress of gases).

Risk of corrosion

● When using chemicals and solvents, comply with the instructions of the

producer and the general lab safety rules!

Measures for your operational safety

Caution

● Never unscrew the two halves of the housing!

● Have the meter serviced only by METTLER TOLEDO Service!

● Any spillage should be wiped off immediately! Some solvents might

cause corrosion of the housing.

● Avoid the following environmental influences:

• Powerful vibrations

• Direct sunlight

• Atmospheric humidity greater than 80%

• Corrosive gas atmosphere

• Temperatures below 5 °C and above 40 °C

• Powerful electric or magnetic fields

6 Safety measures
FCC Rules

This device complies with Part 15 of the FCC Rules and Radio Interference Requirements of the

Canadian Department of Communications. Operation is subject to the following conditions: (1)

this device may not cause harmful interference, and (2) this device must accept any interference

received, including interference that may cause undesired operation.

This equipment has been tested and found to comply with the limits for a Class A digital device,

pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection

against harmful interference when the equipment is operated in a commercial environment. This

equipment generates, uses, and can radiate radio frequency energy and, if not installed and used

in accordance with the instruction manual, may cause harmful interference to radio communica

tions. Operation of this equipment in a residential area is likely to cause harmful interference in

which case the user will be required to correct the interference at his own expense.

Safety measures 7
3 	Installation

Carefully unpack the meter. Keep the calibration certificate in a safe place. Insert the right adapter

clip into the power adapter slot: PUSH

3.1 	Installing the electrode arm

The electrode arm can be used as a stand alone or it can be attached to the instrument on the left

or right side, according to your preferences. The height of the electrode arm can be varied by using

the extension shaft part. Use the wrench to attach the extension part .

8 Installation
Assembly of the electrode arm

● Use the wrench to attach the base to the electrode arm by tightening the screws. The electrode

arm can now be used in the stand alone mode.

Installation 9
● To attach the electrode arm to the instrument, remove the plastic covers in a first step.

10 Installation
● Then insert the foot of the meter to the arm base and shift the meter in the direction of the arrow to make the foot fit.

● Use the lock screw to attach the meter to the base of the arm.

Installation 11
3.2 	Connecting a sensor

To connect pH or Ion sensors, disconnect the rubber plug from the pH socket. Connect the elec

trode and make sure that the plugs are properly inserted. If you are using an electrode with a builtin temperature probe or a separate temperature probe, connect the other lead to the ATC socket.

Twist the RCA (Cinch) plug to ease the attachment of the sensor.

ISM® sensor

When connecting an ISM® sensor to the meter, one of the following conditions have to be met for

the calibration data to be transferred automatically from the chip of the sensor into the meter and is

used for further measurements. After attaching the ISM® sensor ...

● The meter must be switched on.

● (If the meter is already switched on) the READ key is pressed.

● (If the meter is already switched on) the CAL key is pressed.

We strongly recommend you to switch off the meter when disconnecting an ISM sensor. In doing

so, you make sure that the sensor is not removed while the instrument is reading data from or writ

ing data to the ISM-chip of the sensor.

The ISM icon appears on the display and the sensor ID of the sensor chip is registered and

appears on the display.

The calibration history, the initial certificate and the maximum temperature can be reviewed and

printed in the data memory.

12 Installation
4 	Operating the meter

4.1 	Backside layout

c d f

a b j h g

e

a BNC socket for mV/pH signal input

b RCA (Cinch) socket for temperature signal input

c Reference socket for reference electrodes

d Digital socket for digital electrodes

e RS232 interface

f DC power supply socket

g USB A interface

h USB B interface

i Mini DIN socket for METTLER TOLEDO stirrer

4.1.1 	Pin assignments RS232 connection

Below the PIN assigments for the RS-232 interface are shown. To this interface can be connected

METTLER TOLEDO printers such as RS-P25.

Operating the meter 13
4.2 	The display

There are two modes for the display: the full-information screen with all the information on the dis

play and the measurement close-up screen (superview) in which the measurement information is

shown with large font. Switching between these views is possible by pressing READ for 2 s, both

during a measurement or after/before a measurement.

5 6 2 3 4 1 7

20

19

23

17

18

13 14 15 16

8

10

9

21

12

11

5 6 2 3 4 1 7

21

19

20

23

22

9

8

10

9

12

11

13 14 8 15 16

1 Measurement value

2 USB device connected

3 PC connected (for LabX direct)

14 Operating the meter
4 Stirrer icon (when stirring is taking place)

5 Data logging icon (timed interval reading)

6 Routine mode icon (user access rights are restricted)

7 Date and time

8 Measurement temperature

9 Endpoint format

10 Temperature compensation

ATC: Temperature sensor

connected

MTC: no temperature sensor

connected or detected

11 Number of data sets in mem

ory

12 User ID

13 Softkey

14 Softkey

15 Softkey

16 Softkey

17 Sample ID

18 Sensor ID

19 pH electrode condition icon

Slope: 95-105%

Offset: ±(0-20)mV

Electrode is in good condition

Slope: 94-90%

Offset: ±(20-35)mV

Electrode needs cleaning

Slope: 89-85%

Offset: ±(>35)mV

Electrode is faulty

20 ISM® sensor connected

21 Stability criterion

Strict Medium Fast

22 Warning messages

23 Buffer groups or standards

Operating the meter 15
4.3 	Key controls

Key Press and release Press and hold for 2 seconds

Switch meter on or off Switch meter on or off

Switch between measurement

close-up screen and full-infor

mation screen

Start calibration Review the last calibration data

Softkeys The function of the softkeys

varies from screen to screen

(see “Using the softkeys”)

ON/OFF

READ Start or end measurement

(measurement screen)

Confirm input or start editing

a table

Exit menu and go back to

measurement screen

CAL

4.4 	Using the softkeys

The meter has four softkeys. The functions assigned to them change during operation depending

on the application. The assignment is shown on the bottom line of the screen.

In the measurement screen, the softkeys are assigned as follows:

Data Menu Mode

Access data menu Access meter settings Change measurement mode

The other softkey functions are:

Move one position to the right Edit Edit table or value

Move one position to the left End End calibration

Scroll up in the menu Yes Confirm

Scroll down in the menu No Reject

Increase value Review Review selected data

Decrease value Save Save data, setting or value

Scroll to next data set in mem

ory

Select Select the highlighted function

or setting

Delete letters or numbers on

alphanumeric keypad

Start Begin the reference measure

ment

Delete Delete selected data Trans Transfer selected data

 

 

 

 

 

 

 

16 Operating the meter
4.5 	Selecting a measurement mode

Press the MODE softkey to switch between the different measurement modes.

The sequence of the alternating measurement modes is:

1. pH

2. mV

3. rel. mV

4. ion

4.6 	Navigating between menus

The meter display consists of a measurement frame, softkeys, areas for status icons and underly

ing menu areas.

To access the menu areas and to navigate between them, use various softkeys (see “Using the

softkeys”).

● Press Menu.

The Setup menu appears and the pH/Ion tab is highlighted.

● Press to highlight the Setup tab, or

● Press to highlight Sensor ID / SN.

● Press EXIT to return to the measurement screen.

4.7 	Navigating within a menu

This example is based on the Setup menu, but the procedure applies to the other menus as well.

● Press Menu.

The Setup menu appears and the pH/Ion tab is highlighted.

● Press as often as needed to navigate to a menu item.

● Press Select to move deeper in the menu for the chosen operation.

● Continue navigating with 

, or Select until the final destination is reached within

the menu.

● Press MODE/EXIT to go back to the previous menu.

— or —

● Press READ to return to the measurement screen directly.

4.8 	Using the alphanumeric keypad

4.8.1 	Alphanumeric input

The meter has a screen keypad for entering IDs, SNs and PINs. Both numbers and letters are allowed for these entries.

When entering a PIN, each character entered will be displayed as ( * ).

Operating the meter 17
1 Press to move left to highlight number or letter, use to move right, and to

move downwards.

2 Press READ to confirm the entry.

The line where the position of alphanumeric character is being entered blinks.

3 To end and confirm entry, use softkeys to highlight screen key OK, and press READ to save

the ID.

— or —

4 To delete information, use softkeys to highlight and press READ to delete the previously

entered character.

— or —

5 Press EXIT to return to the upper level of the menu.

The entries are rejected.

4.8.2 	Entering IDs / PIN

The four softkeys and READ key are used for navigating on the keypad and entering the ID/PIN.

Example: WATER

1 If 1 is highlighted, press once.

Q is highlighted.

2 Press once.

W is highlighted.

3 Press READ to enter W.

4 Repositioning the highlighted bar to A, T, E and R, and press READ to enter each letter of sam

ple ID in sequence as described in steps 1 - 3.

5 Reposition the highlighted bar to OK, and press READ to save the sample ID.

Instead of entering an ID with the alphanumeric keypad, one can also use a USB-keyboard or a

USB-barcode scanner. In case a character is entered or scanned that is not present on the instru

ment keyboard it will display the entry as an underscore (_).

4.8.3 	Editing values in a table

The meter has a feature, which allows the user to enter, edit or remove values in tables. (for exam

ple, temperature and buffer values for a customized buffer group). This is accomplished by using

the softkeys on the display to navigate from cell to cell.

18 Operating the meter
1 Press READ to start editing the cell in the table.

The softkeys on the display change.

2 Press and to enter the value and press READ to confirm.

The softkeys change back to and .

3 Navigate to a cell and press Delete to remove a value.

4 To finish editing the table, navigate with the and to highlight Save.

5 Press READ to confirm the action and exit the menu.

4.9 	Calibration

The meter allows you to perform pH/ion calibrations with up to 5 points.

Calibration is only possible in the full-information screen. When starting a calibration by pressing

the CAL key while the instrument displays the close-up screen, it will automatically switch to the

full-information screen.

4.9.1 	Running a one-point pH/ion calibration

1 Place the electrode in a calibration buffer/standard and press CAL.

Cal 1 appears on the display

2 The meter endpoints according to the preselected endpoint mode after the signal has stabilized

or after pressing READ.

The relevant buffer/standard value is shown on the display.

3 Press End to accept the calibration.

The calibration result is shown on the display.

4 Press Save to save the result.

— or —

5 Press Exit to reject the calibration and return to sample measurement.

● With the one-point calibration only the offset is adjusted. If the sensor was previously calibrat

ed with a multipoint calibration the previously stored slope will remain. Otherwise the theoreti

cal slope (-59.16mV/pH) will be used.

4.9.2 	Running a multi-point pH/ion calibration

pH and ion calibrations can be run with this meter for up to 5 points.

1 Run the calibration as described in “Running a one-point pH/ion” (steps 1 - 2).

2 Rinse the electrode with deionized water.

3 Place the electrode in the next calibration buffer.

4 Press CAL.

Cal 2 appears on the display. The meter endpoints according to the preselected endpoint

mode after the signal has stabilized or after pressing READ. The relevant buffer value is

shown on the display.

5 Repeat the steps 2 - 4 for all calibration buffers.

6 Press End to end the calibration procedure.

Alternatively, the meter ends the calibration automatically when 5 calibrations are per

formed. The offset value and slope are shown on the display.

7 Press to scroll down to next data set

Operating the meter 19
8 Press Save to keep the calibration.

9 Press EXIT to reject the calibration.

4.10 	Automatic buffer recognition

The meter features automatic pH buffer recognition for the predefined buffer groups (see “Appen

dix”) and the user-defined buffer groups. The buffers within a buffer group are automatically recog

nized by the meter and displayed during calibration.

This feature allows the calibration in any order within a predefined or user-defined pH buffer group.

4.11 	Sample measurements

● Place the sensor in the sample and press READ to start a measurement.

• The display shows the readings of the sample.

• The endpoint format blinks, indicating a measurement is in progress.

As soon as the measurement is stable according to the selected stability criterion, the Stability

icon appears.

● If the “automatic endpoint” format is selected, the measurement stops automatically as soon

as the Stability icon appears.

● If the “manual endpoint” format is selected, press READ to manually stop the measurement.

● If the “timed endpoint” format is selected, the measurement stops after the preset time.

4.12 	Data transfer

It is possible to transfer either all data or a user-defined set of data from the memory to a METTLER

TOLEDO printer (for example RS-P26), to a PC by using LabX direct or to a USB memory stick.

The following section describes how to proceed with the different configurations.

Data transfer from the meter to a printer

1 Connect the RS232 cable to the meter and the corresponding interface on the backside of the

printer.

2 Select the interface “printer” in the data transfer settings menu (see “Setup: Data Transfer Set

tings”).

3 Start transfer in the data menu.

For some printers (e.g. RS-P25, RS-P26 and RS-P28), the baud rate settings will be automatically

synchronized with those of the instrument.

For other printers the settings for data transfer in the printer need to be adjusted as follows:

● Baud rate: 1200

● Data bits: 8

● Parity: none

● Stop bits: 1

Data transfer from the meter to LabX direct pH

1 Connect the instrument via USB B to the PC.

The icon appears on the display.

2 Select the interface “LabX direct” in the data transfer settings menu (see “Setup: Data Transfer Settings”).

3 Open LabX direct pH and select the correct instrument.

20 Operating the meter
4 Select the item and Transfer in the data menu to start the transfer.

Data export from the meter to a USB stick

1 Insert the USB stick into the corresponding interface of the meter.

The icon appears on the display.

2 Select the item and Export to USB-Stick in the data menu to start the transfer.

The data will be in text (extension .txt) format. The instrument will create a new folder on the USBstick in which the name is the date in the international format, i.e. first year, then month and then

the day.

Example: when the date is 25 November 2011, the name of the folder will be: 20111125.

The data will be written as a text file with a name that consists of the time in 24h format (hr min

sec) with a prefix depending on what kind of data is exported. This prefix is M for measurement

data and C for calibration data.

Example: when calibration data are exported at 15:12:25 (3:12:25 pm) the name of the file will

be: C151225.txt

Pressing EXIT during the exporting aborts the process

4.13 	Temperature compensation

We recommend the use of either a built-in or a separate temperature probe. If a temperature probe

is used, ATC and the sample temperature are displayed. If no temperature sensor is used, MTC is

displayed and the sample temperature should be entered manually.

The meter accepts both NTC 30 kΩ and pT1000 temperature sensors, with selection taking place

either automatically or manually (see “Menus and settings: Temperature settings”).

In the pH and ion mode, the meter calculates the temperature-adjusted electrode slope using this

temperature and shows the temperature-compensated pH/ion value in the measurement display.

Operating the meter 21
5 	Setup

5.1 	Menu structure of setup

The individual items of the menu setup are described on the pages following the list below.

1. Sample ID 5. System settings

1. Enter Sample ID 1. Language

2. Select Sample ID 2. Time and Date

3. Delete Sample ID 3. Access Control

2. User ID 4. Beep

1. Enter User ID 5. Routine/Expert Mode

2. Select User ID 6. Screen Settings

3. Delete User ID 6. Service

3. Stirrer 1. Software Update

1. Stir Before Measurement 2. Export Settings to USB-stick

2. Stir During Measurement 3. Factory Reset

3. Stir Speed 7. Instrument Self-test

4. Stirrer Voltage Settings

4. Data Transfer Settings

1. Data Logging

2. Interface

3. Printout Format

5.2 	Sample ID

An alphanumeric sample ID with up to 16 characters can be entered. Alternatively, a previously

entered sample ID can be selected from the list. If a sample ID has been entered, which is either

purely numeric (for example, 123) or ends with a number (for example, WATER123), the follow

ing options are available:

1. <Auto Sequential> On

Using this setting will automatically increment the sample ID by 1 for each reading.

2. <Auto Sequential> Off

The sample ID is not incremented automatically.

A maximum of 10 sample IDs are stored in memory and listed for selection. If the maximum of 10

has already been entered, a sample ID can either be deleted manually or the oldest ID will be auto

matically overwritten by the new ID.

This instrument allows a special process for users that would like to enter the sample ID in a

quicker way. When the homescreen is shown, while no measurement or calibration is running,

typing on a USB-keyboard or scanning with a barcode reader, results in a jump in the sample ID

entry screen and the entered characters are shown. In case a character is entered or scanned that

is not present on the instrument keyboard (see “Operating the meter: Entering IDs/PIN”). It will dis

play the entry as an underscore (_).

5.3 	User ID

A user ID with up to 16 characters can be entered. Alternatively, a previously entered user ID can

be selected from the list.

22 Setup
A maximum of 10 user IDs are stored in memory and listed for selection. If the maximum of 10

has already been entered, a user ID can either be deleted manually or the oldest ID will be auto

matically overwritten by the new ID.

5.4 	Stirrer

The user can connect the METTLER-TOLEDO external magnetic stirrer to the instrument. This stirrer is powered by the instrument and will be automatically switched on/off according to the settings

by the user.

1. Stir Before Measurement

● <Stir Before Measurement> On

Using this setting will include a stirring period before the measurement starts (after pressing

READ). The user can set the time between 3 s and 60 s.

● < Stir Before Measurement > Off

No stirring before the measurement will take place.

2. Stir During Measurement

● <Stir During Measurement> On

Using this setting will results in stirring during the measurement. When the measurement end

points, the stirrer is automatically swiched off.

● < Stir During Measurement > Off

No stirring during the measurement will take place.

3. Stir Speed

● The user can adjust the stir speed of the stirrer according to his preferences and the character

istics of the sample.

● A stir speed between 1 and 5 can be selected, with 5 being fastest.

To indicate that the instrument is stirring when the option “Stir Before Measurement” has been

selected, the instrument will display the icon .

5.5 	Data Transfer Settings

1. Data Logging

The meter stores up to 1000 sets of measurement data in the memory. The number of data sets already stored in the memory is indicated by MXXXX on the display. A message appears on the dis

play when the memory is full. To save further measurements if the memory is full, data has to be

deleted first. You can select between automatic and manual storage.

1. Automatic storage

Stores/transfers every endpointed reading to the memory/interface or both automatically.

2. Manual storage

If “Manual Storage” is set, Store appears on the display as soon as a measurement has end

pointed. Press Store to save/transfer endpointed readings. The endpointed reading can only

be stored once. When the data is stored, Store disappears from the measurement screen.

When the Store key is shown but you go into the menu settings before saving the measure

ment, the Store key will not be present anymore when you exit the menu settings and return to

the measurement screen.

Setup 23
2. Interface

Select to transfer the data in the memory to a Printer, LabX Direct or both. The meter adjusts the

baud rate to the following settings in case no automatic baud rate synchronization occurs (only

possible with USB and the printers RS-P25, RS-P26 and RS-P28):

1. Printer

Baud rate: 1200

Data bits: 8

Parity: none

Stop bits: 1

Handshake: none

2. LabX direct

The settings between the instrument and PC are adjusted automatically because USB connec

tion is plug-and-play

3. Printer + LabX direct

The settings listed above for 1. and 2. are used.

3. Printout Format

Three different printout formats are available: GLP, Normal and Short. The printouts can be printed in six different languages, depending on which language is currently selected in Setup (English,

German, French, Italian, Spanish and Portuguese). For all other languages the printouts will be in

English.

* If LabX direct is selected, the printout format is always GLP and English. LabX direct PC software

translates the received data into the selected PC language as defined in the regional and language

options.

Examples:

pH printout GLP pH printout normal pH printout short

<pH>

GLP

24-Jul-05

10:56 AM

BEER

6.997 pH

0.5 mV

25.0 °C ATC

Auto EP Strict

INLAB413

122222222

Last cal.: 09-Jun-2010

10:56 AM

Ivy

Signature:____________

Outside limits

<pH>

Normal

24-Jul-05

10:56 AM

BEER

6.997 pH

0.5 mV

25.0 °C ATC

Auto EP Strict

INLAB413

<pH>

0.5 mV

25.0 °C ATC

Auto EP Strict

INLAB413

5.6 	System settings

The system settings menu is protected by a PIN. Upon delivery, the PIN is set to 000000 and is

activated. Please change the PIN to prevent unauthorized access.

24 Setup
1. Language

The following languages are available for the system: English, German, French, Spanish, Italian,

Portuguese, Chinese, Japanese, Korean and Russian.

2. Time and date

When starting the meter for the first time, the display for entering time and date appears automati

cally.

In the system settings, two time and four date display formats are available:

● Time

24-hour format (for example, 06:56 and 18:56)

12-hour format (for example, 06:56 AM and 06:56 PM)

● Date:

28-11-2010 (day-month-year)

11-28-2010 (month-day-year)

28-Nov-2010 (day-month-year)

28/11/2010 (day-month-year)

3. Access control

PIN settings are available for:

1. System settings

2. Deleting data

3. Instrument login

1 Switch PIN protection for the required access control ON. The window for entering an alphanu

meric PIN appears.

2 Enter an alphanumeric PIN (max. 6 characters).

The input window for PIN verification appears.

3 Confirm PIN.

A maximum of 6 characters can be entered as PIN. In the factory default settings, the PIN for sys

tem settings and deleting data is set to 000000 and is activated, no instrument login password is

set.

4. Beep

An acoustic signal can be switched on in the following three cases:

1. Key is pressed

2. Alarm/warning message appears

3. Measurement is stable and has endpointed (stability signal appears)

5. Expert/Routine modes

The meter has two working modes:

● Expert mode: the factory default setting enables all functions of the meter.

● Routine mode: some of the menu settings are blocked.

The concept of the two working modes is a GLP feature that ensures that important settings and

stored data cannot be deleted cannot be unintentionally changed under routine working conditions.

The meter only allows the following functions in the routine mode:

Setup 25
● Calibrating and measuring

● Editing user, sample and sensor IDs

● Editing the MTC temperature

● Editing data transfer settings

● Editing system-settings (PIN-protected)

● Running the instrument self-test

● Storing, viewing, printing and exporting data

● Exporting settings to USB-stick

6. Screen settings

Screen Brightness

The screen brightness can be set from levels 1 to 16.

Screen Saver

The amount of time can be set which passes before the screen saver is activated:

5-99 minutes

If the meter is not operated during this time, the screen saver is activated. Press any key and the

display is activated again, independent of the function of the key.

Screen Color

The display background color blue, grey, red or green can be selected.

The display has a limited lifetime; therefore we recommend activating the screen saver or switching

off the meter when not in operation.

If an instrument login password is set, this password is required after activating the display again.

5.7 	Service

1. Software Update

In case a newer software version is available, the user can perform a software update via USBstick, by adhering to the following process:

1 Make sure that the firmware is in the root directory of the USB-stick and has a name

S<xxx>v<yyy>.bin, with <xxx> being the number of the instrument type (220 for pH/Ion meter and 230 for conductivity meter) and <yyy> being the version number.

2 Connect the USB-stick to the instrument

3 Select the option “software update”

A message appears that the software update ist in progress

4 When the software update is completed you need to restart the instrument for the changes to

become effective.

● After the software update the instrument is switched back to factory settings. All unsaved data

will be lost and the PIN will be set back to “000000”.

● In case the USB-stick is removed during the update process or the power adapter is plugged

out, the instrument cannot be switched on anymore. Please contact METTLER TOLEDO service

in that case.

26 Setup
2. Export Settings to a USB-stick

With this feature the user can export the settings. These can for example be sent via e-mail to a

customer service representative in case difficulties occur, so that it is easier for the customer ser

vice representative to provide support.

1 Insert the USB stick into the corresponding interface of the meter

The icon appears on the display

2 Select the item and Export Settings to USB-Stick in the service menu to start the transfer

The settings will be in text (extension .txt) format. The instrument will create a new folder on the

USB-stick in which the name is the date in the international format, i.e. first year, then month and

then the day.

Example: when the data is 25 November 2011, the name of the folder will be: 20111125.

The data will be written as a text file with a name that consists of the time in 24h format (hr min

sec) with the prefix S.

Example: when settings are exported at 15:12:25 (3:12:25 pm) the name of the file will be:

S151225.txt

Pressing EXIT during the exporting aborts the process

3. Factory Reset

When the factory reset is performed, the instrument will revert back to the original settings when

the instrument left the factory. All data will be lost and the PIN is set-back to the original PIN

“000000”.

5.8 	Instrument self-test

The instrument self-test requires user interaction.

1 In the Setup menu, select “6. Instrument Self-test”.

Selecting the menu item starts the self-test routine.

2 Press the function keys on the keypad one by one in any order.

The self-test result is displayed after a few seconds.

The meter returns to the system settings menu automatically.

● The user needs to finish pressing all seven keys within two minutes, otherwise “Self-test

failed!” appears and the procedure has to be repeated.

● If error messages repeatedly appear, contact METTLER TOLEDO Service.

Setup 27
6 	Menus and settings

6.1 	Menu structure of pH/ion

1. Sensor ID/SN 4. Endpoint Formats

2. Calibration Settings 5. Timed Interval Readings

1. Buffer Group/Standard 6. Temperature Settings

2. Calibration Mode 1. Set MTC Temperature

2. Calibration Reminder 2. Temperature Unit

3. Measurement Settings 3. Temp. Sensor Recognition

1. Measurement Resolution 7. Measurement Limits

2. Stability Criterion

3. Ion Measurement Unit

4. Ion Type

5. Rel. mV Offset

6.2 	Sensor ID/SN

1. Enter Sensor ID/SN

An alphanumeric sensor ID with up to 12 characters can be entered. The sensor ID will be assigned to each calibration and measurement value. This is valuable for tracing back data.

The maximium number of sensors for both sensor types (pH and Ion) is 30. When this number

has been reached, first a sensor has to be deleted before a new sensor can be created (see the

note at the end of this section how to delete a sensor).

If a new sensor ID is entered, the theoretical calibration slope and offset for this type of electrode

will be loaded. The sensor has to be newly calibrated.

If a sensor ID is entered, which is already in the memory of the meter and has been calibrated before, the specific calibration data for this sensor ID will be loaded.

When a new ion sensor ID is entered, the ion type for this sensor can be selected. This ion type

remains assigned to this sensor until the sensor has been deleted.

When connecting an ISM® sensor to the meter, the meter will:

● Automatically recognize the sensor when it’s turned on (alternatively, when pressing READ or

CAL)

● Load the stored sensor ID, sensor SN and sensor type as well as the latest calibration data of

this sensor

● Use this calibration for the subsequent measurements

The sensor ID for ISM® sensors can be changed. Sensor SN and sensor type, however, are blocked

for modification.

2. Select Sensor ID

Already entered sensor IDs can be selected from a list.

If a sensor ID is selected, which is already in the memory of the meter and has been calibrated before, the specific calibration data for this sensor ID will be loaded.

28 Menus and settings
You can delete a sensor ID with its calibrations in the calibration data menu.

6.3 	Calibration settings

Buffer groups/standards

Predefined pH buffer groups

One of eight predefined buffer groups can be selected:

B1 1.68 4.01 7.00 10.01 (at 25°C) Mettler US

B2 2.00 4.01 9.00 9.21 11.00 (at 25°C) Mettler Europe

B3 2.00 4.00 7.00 9.00 12.00 (at 20°C) Standard Merck

buffer

B4 1.680 4.008 6.865 9.184 12.454 (at 25°C) DIN19266

B5 1.09 4.65 6.79 9.23 12.75 (at 25°C) DIN19267

B6 1.680 4.003 6.864 9.182 12.460 (at 25°C) Chinese

B7 2.00 4.01 7.00 10.00 (at 25°C) Technical buffer

B8 1.679 4.008 6.865 9.180 (at 25°C) JIS Z 8802

Temperature tables for these buffers are programmed in the meter and can be found in the “Appen

dix”.

Customized pH buffer group

A set of user-defined pH buffers with up to 5 different temperatures for each buffer can be created.

The temperature difference between pH buffers must be at least 5 °C and the difference between the

pH values must be at least 1.

When switching from predefined buffer group to customized buffer group, press Save in the table

even if no values have changed.

Ion standards

Concentrations for up to 5 standards with one standard temperature can be defined. The ion con

centration unit for measurements and calibration can be defined. Six concentration units are avail

able:

● mmol/L

● mol/L

● ppm

● mg/L

● %

● pX

1 Select ion concentration unit

2 Edit table by pressing Read

3 Press and to enter the value and press READ to confirm.

4 Navigate with the arrows to Save and press READ to confirm

Calibration mode

Two calibration modes are offered:

Menus and settings 29
● Segmented: the calibration curve is made up of linear segments joining the individual calibra

tion points. If high accuracy is required, the segment method is recommended.

● Linear: the calibration curve is determined using linear regression. This method is recom

mended for samples with widely varying values.

These settings applies to both pH and Ion calibration.

Calibration reminder

When the calibration reminder is “On”, the user is reminded to perform a new calibration after a

certain user-defined interval (maximum 9999 h) has elapsed.

● Press READ to save the interval and another screen appears to select calibration expiration

date.

Four different time spans can be programmed. In all four cases, a warning message appears that

the electrode should be calibrated.

● Immediately

The meter is immediately blocked for measurement when the predefined interval has elapsed.

● Reminder + 1h

The meter is blocked for measurement 1 hour after the predefined interval has elapsed.

● Reminder + 2h

The meter is blocked for measurement 2 hours after the predefined interval has elapsed.

● Continue Reading

The user can continue measuring when the predefined interval has elapsed.

6.4 	Measurement settings

Measurement Resolution

The resolution for pH and mV needs to be set for the display. Up to 3 decimal places can be cho

sen depending on the unit of measurement (see table below).

On display Description Option

X.XXX three decimal places pH

X.XX two decimal places pH

X.X one decimal place pH, mV

X no decimal places mV

In the ion mode, the measurement resolution depends on the concentration and the unit of the

measured ion.

Stability Criterion

The Stability icon appears according to the following stability criteria:

- Stability criteria for pH and mV measurement

Strict

The measured signal should not change by more than 0.03 mV in 8 seconds or by more than

0.1 mV in 30 seconds.

Medium

30 Menus and settings
The measured signal should not change by more than 0.1 mV in 6 seconds.

Fast

The measured signal should not change by more than 0.6 mV in 4 seconds.

- Stability criterion for ion measurement

Strict

The measured signal should not change by more than 0.03 mV in 12 seconds or by more than

0.08 mV in 26 seconds.

Medium

The measured signal should not change by more than 0.08 mV in 8 seconds.

Fast

The measured signal should not change by more than 0.3 mV in 4 seconds.

Ion Measurement Units

The ion concentration unit for measurements and calibration can be selected between the following

six units: mmol/L, mol/L, ppm, mg/L, %, pX.

In some cases, changing measurement units requires the user to first recalibrate before starting a

measurement, otherwise an error message will appear. The units of measurement are divided in

two groups: 1. mmol/L, mol/L and pX, and 2. ppm, mg/L, %. Changing within a group does not

require calibration, but changing between the two groups does.

Ion Type

When using an ion sensor to which previously a sensor ID has been assigned, the ion type that

has been assigned to this sensor ID is automatically used.

However, in case one would like to measure without a sensor ID, it is important to assign the cor

rect ion type. This is because the theoretical slope depends on the charge of the ion (see below)

Eight specific and four general ion types are available:

F- (fluoride), Cl- (chloride), CN- (cyanide), NO3- (nitrate), Na+ (sodium), K+ (potassium), Ca2+

(Calcium), Cu2+ (cuprous), Ion-, Ion+, Ion2- and Ion2+.

Depending on the type of electrode the theoretical slope differs due to the charge of the ion. The flu

oride electrode has e.g. a theoretical slope of +59.16 mV/pX whereas the theoretical slope of a

calcium electrode is -29.58 mV/pX. This theoretical value is loaded for a new entered sensor ID

until the sensor is calibrated.

Rel. mV Offset

In the rel. mV mode the offset value is subtracted from the measured value. Either an offset value

can be entered or it can be determine by measuring the mV of a reference sample.

Offset value

● Enter an offset value in mV between -1999.9 and +1999.9 mV.

Menus and settings 31
Test a reference sample

1 Place electrode into the reference sample.

2 Press Start to begin the reference measurement and wait until the measurement display

freezes.

— or —

3 Press READ to manually end the measurement.

4 Press Save to enter the measured mV value as offset into the meter.

6.5 	Endpoint formats

Auto

With the automatic endpoint the selected stability criterion determines the end of an individual

reading depending on the behavior of the sensor used. This ensures an easy, quick and precise

measurement.

1 Place sensor in the sample.

2 Press READ.

A appears on the display.

The measurement ends automatically when the measured value is stable. appears.

If READ is pressed before the signal is stable, the endpoint format changes to manual .

Manual

Unlike Auto, user interaction is required to stop the measurement reading in manual mode.

1 Place sensor in the sample.

2 Press READ.

M appears on the display.

appears on the display to signalize measurement stability.

3 Press READ to end the measurement. appears.

Timed

The measurement stops after the set time, which can be set between 5 s and 3600 s.

1 Place sensor in the sample.

2 Press READ.

T appears on the display.

appears on the display to signalize measurement stability.

The measurement ends automatically when the set time period expires. appears.

If READ is pressed before the signal is stable, the endpoint format changes to manual .

Information on the display

The following symbols appear in the display, depending on the endpoint setting.

32 Menus and settings
1

The actual endpoint format (last column) and not the preselected is stored with the data.

6.6 	Timed Interval Readings

A reading is taken every time after a certain interval (1 – 2400 s) defined in the menu has

elapsed. When working in the timed-interval reading mode, the interval can be defined by entering

the seconds. The measurement series stops according to the selected endpoint format or manually

by pressing READ. When timed-interval reading is “on”, the DL icon appears.

The readings can be stored in the memory, transferred to the interface or both.

6.7 	Temperature settings

● Set MTC temperature

If the meter does not detect a temperature probe, MTC appears on the display. In this case the

sample temperature should be entered manually. An MTC value between -30 °C and 130 °C

can be entered.

● Temperature unit

Select the temperature unit: °C or °F. The temperature value is automatically converted

between the two units.

● The instrument works with NTC30 kΩ and Pt1000 temperature sensors. You can select between automatic recognition or manual selection of the temperature sensor type. For temper

atures below 100°C the instrument can reliably distinguish between NTC30 kΩ and Pt1000.

At higher temperatures, however, it is necessary to set the type of temperature sensor manual

ly to avoid mistakes.

6.8 	Measurement limits

The upper and lower limits for measurement data can be defined. If a limit is either not reached or

exceeded (in other words, less than or greater than a specific value), a warning is displayed on

the screen and may be accompanied by an acoustic signal. The message “outside limits” also appears on the GLP printout.

Menus and settings 33
7 	Data management

7.1 	Menu structure of data menu

1. Measurement data

1.1 Review

1.2 Transfer

1.3 Delete

1.4 Export to USB-stick

2. Calibration data

2.1 pH

2.1.1 Review

2.1.2 Transfer

2.1.3 Delete

2.1.4 Export to USB-stick

2.2 Ion

2.2.1 Review

2.2.2 Transfer

2.2.3 Delete

2.2.4 Export to USB-stick

3. ISM Daten

3.1 Initial Calibration Data

3.2 Calibration History

3.3 Maximum Temperature

3.4 Reset ISM

7.2 	Measurement data

Review

All

All stored measurement data can be reviewed; the most recent data saved appears on the display.

● Press Transfer to send the measurement data (current single set) to the printer or PC.

Partial

The measurement data can be filtered according to 3 criteria.

● Memory number (from MXXXX to MXXXX)

● Sample ID

● Measurement mode

Memory number

1 Enter the memory numbers of the data and press Select.

The measurement data is displayed.

2 Scroll through the measurement data to review all measurements between the two memory

numbers.

34 Data management
3 Press Transfer to send the measurement data (current single set) to the printer or PC.

Sample ID

1 Enter the sample ID and press OK.

The meter finds all stored measurements with this sample ID.

2 Scroll through the measurement data to review all measurements with the entered sample ID.

3 Press Transfer to send the measurement data (current single set) to the printer or PC.

Measurement mode

1 Select a measurement mode from list. The meter finds all stored measurements of the selected measurement mode.

2 Scroll through the measurement data of the selected measurement mode.

3 Press Transfer to send the measurement data (current single set) to the printer or PC.

Transfer

All or partially stored measurement data can be transferred by filtering the measurement data. The

filter works as described above in “Review”.

● Press Select to send the filtered measurement data to the printer or PC.

Delete

All or partially stored measurement data can be deleted by filtering the measurement data. The filter

works as described above in “Review”.

Deletion is protected by a PIN. Upon delivery, the PIN is set to 000000. Change the PIN code to

prevent unauthorized access.

Export to USB-stick

All or partially stored measurement data can be transferred to a USB-stick. The filter works as described above in “Review”. More information about the file format is given in “Operating the meter:

Data transfer”

● Press Transfer to export the filtered measurement data to the USB-stick.

7.3 	Calibration data

Calibration data can be reviewed, transferred and deleted. The latest calibration per sensor ID is

stored in the memory. When using ISM-Sensors, the latest 5 calibration data can be viewed/printed

(See “Data management: ISM data”).

Review

1 Press Select.

A list of calibrated sensor IDs appears.

2 Select a sensor ID from the list.

The calibration data is shown for this sensor ID

— or —

3 Press and hold CAL for 3 seconds in the measurement screen.

4 Press Transfer to send the displayed calibration data to a printer or PC.

Data management 35
Transfer

1 Press Select.

A list of calibrated sensor IDs appears.

2 Select a sensor ID from the list.

The calibration data of the selected sensor ID is transferred to a printer or PC.

Delete

1 Press Select.

A list of sensor IDs appears.

2 Select a sensor ID from the list.

3 Press Yes when the message “Selected data will be deleted. Please confirm” appears.

— or —

4 Press Exit to cancel.

After deletion, the sensor ID disappears from the list in the sensor ID menu.

● An active sensor ID cannot be deleted.

● This menu is protected by a deletion PIN code. Upon delivery, the PIN code is set to 000000.

Change the PIN code to prevent unauthorized access.

Export to USB-stick

Stored calibration data per sensor ID can be transferred to a USB-stick.

1 Press Select.

2 Select a sensor ID from the list.

3 Press Transfer to export the calibration data of the selected sensor ID to the USB-stick.

7.4 	ISM data

SevenCompact meter incorporates Intelligent Sensor Management (ISM®) technology. This inge

nious functionality provides extra security, safety and eliminates mistakes. The most important fea

tures are:

Extra security!

● After connecting the ISM® sensor, the sensor is automatically recognized and the sensor ID

and serial number are transferred from the sensor chip to the meter. The data is also printed

on the GLP printout.

● After calibration of the ISM® sensor, the calibration data is automatically stored from the meter

to the sensor chip. The most recent data is always stored where it should be – on the sensor

chip!

Extra safety!

After connecting the ISM® sensor, the five most recent calibrations are transferred to the meter.

These can be reviewed to see the development of the sensor over time. This information provides

an indication if the sensor should be cleaned or renewed.

Eliminate mistakes!

After connecting an ISM® sensor, the last set of calibration data is automatically used for measure

ments.

Additional features are described below.

36 Data management
Initial calibration data

When an ISM® sensor is connected, the initial calibration data in the sensor can be reviewed or

transferred. The following data is included:

● Response time

● Temperature tolerance

● Membrane resistance

● Slope (at pH 7) and offset

● Type (and name) of electrode (for example, InLab Expert Pro ISM®)

● Serial number (SN) and ordering (ME) number

● Production date

Calibration history

The last 5 calibrations data stored in ISM® sensor including current calibration can be reviewed or

transferred.

Maximum temperature

The maximum temperature that the ISM® sensor has been exposed to during measurement is mon

itored automatically and can be reviewed for the evaluation of the electrode lifetime.

Reset ISM®

The calibration history in this menu can be deleted. This menu is protected by a deletion PIN. Upon

delivery, the PIN for deletion is set to 000000. Change the PIN to prevent unauthorized access.

Data management 37
8 	Maintenance

8.1 	Meter maintenance

Never unscrew the two halves of the housing!

The meters do not require any maintenance other than an occasional wipe with a damp cloth. The

housing is made of acrylonitrile butadiene styrene/polycarbonate (ABS/PC). This material is sensi

tive to some organic solvents, such as toluene, xylene and methyl ethyl ketone (MEK).

Any spillage should be wiped off immediately.

8.2 	Electrode maintenance

Make sure the pH electrode is always kept filled with the appropriate filling solution.

For maximum accuracy, any filling solution that may have “crept” and encrusted the outside of the

electrode should be removed with deionized water.

Always store the electrode according to the manufacturer’s instructions and do not allow it to dry

out.

If the electrode slope falls rapidly, or if the response becomes sluggish, the following procedures

may help. Try one of the following, depending on your sample.

Problem Action

Fat or oil build-up Degrease the membrane with cotton wool

soaked in either acetone or a soap solution.

pH sensor membrane has dried out Soak the tip of the electrode overnight in 0.1M

HCl

Protein build-up in the diaphragm of a pH sen

sor

Remove deposits by soaking the electrode in

an HCl/pepsin solution.

Silver sulfide contamination of pH sensor Remove deposits by soaking electrode in a

thiourea solution.

Run a new calibration after treatment.

Note

Cleaning and filling solutions should be handled with the same care as that given to toxic or corro

sive substances.

8.3 	Disposal

In compliance with European Directive 2002/96/EC on Waste Electrical

and Electronic Equipment (WEEE), this instrument must not be disposed of

together with domestic waste. This also applies to countries outside the EU,

per their specific requirements.

Please dispose of this product in accordance with local regulations at the

collecting point specified for electrical and electronic equipment.

If you have any questions, please contact the responsible authority or the

distributor from which you purchased this instrument.

Should this instrument be passed on to other parties (for private or profes

sional use), the content of this regulation must also be related.

Thank you for your contribution to environmental protection.

38 Maintenance
8.4 	Error messages

Message Description and Resolution

pH/mV/ion/temperature exceeds max.

limit

pH/mV/ion/temperature below min.

limit

Memory is full

Please calibrate electrode

Active sensor cannot be deleted

Wrong buffer

Slope out of range

Offset out of range

Measurement limits are activated in the menu settings

and measured value is outside these limits.

● Check the sample.

● Check sample temperature.

● Make sure that the pH electrode wetting cap has

been removed and that the electrode is properly con

nected and placed in the sample solution.

Max. 1000 measurement data can be stored in the

memory.

● Delete all or partial data in the memory, otherwise

you will not be able to store new measurement data.

Calibration reminder has been switched on in the menu

settings and last calibration has expired.

● Calibrate the electrode.

Deleting the calibration data of the selected sensor ID is

not possible, because it is currently the active sensor ID

in the meter shown on the display.

● Enter new sensor ID in the menu settings.

● Select another sensor ID from the list in the menu

settings.

Meter cannot recognize the buffer or standard/buffer has

been used twice for calibration/two buffers differ less than

60 mV.

● Make sure that you have the correct buffer and that

it is fresh.

● Make sure that the buffer has not been used more

than once during the calibration.

The calibration result is outside the following limits: Slope

< 85% or > 110%, Offset < -60 mV or > + 60 mV.

● Make sure that you have the correct buffer and that

it is fresh.

● Check mV signal of electrode, clean or replace the

electrode.

Standard temp. out of range

Buffer temp. out of range

The ATC measured temperature is out of pH calibration

buffer range: 5 ... 50 °C.

● Keep the buffer/standard temperature within the

range.

● Change the temperature setting.

Maintenance 39
Message Description and Resolution

Temperature differs from setting

ISM® sensor communication error Data has not been transferred correctly between ISM®

sensor and meter. Reconnect the ISM® sensor and try

again.

Self-test failure

Wrong settings

Out of range

Wrong password

Passwords do not match

Program memory error

ATC measured temperature differs by more than 0.5°C

from the user-defined value/temperature range.

● Keep the buffer/standard temperature within the

range.

● Change the temperature setting.

Self-test has not been completed within 2 minutes or meter is defective.

● Restart self-test and finish within 2 minutes.

● Contact METTLER TOLEDO service if problem per

sists.

Entered value differs by less than 1 pH unit/5°C from oth

er preset values.

● Enter a higher/lower value in order to get a bigger

difference.

Either entered value is out of range.

● Enter a value which is within the range shown on

display.

or

Measured value out of range.

● Make sure the electrode wetting cap has been removed and that the electrode is properly connected

and placed in the sample solution.

● If no electrode is connected, put the shorting clip in

the socket.

The entered PIN is not correct.

● Re-enter the PIN.

● Reset to factory settings, all data and settings will

be lost.

The confirmation PIN does not match with the entered

PIN.

● Reenter PIN.

Meter recognizes internal error during start-up.

● Switch the meter off and back on.

● Contact METTLER TOLEDO service if the problem per

sists.

40 Maintenance
Message Description and Resolution

Data memory error

No matching data found in memory

Sensor ID already exists, previous SN

will be overwritten

Update failed

Export failed

The data could not be stored into memory.

● Switch the meter off and back on.

● Contact METTLER TOLEDO service if the problem per

sists.

The entered filter criterion does not exist.

● Enter a new filter criterion.

Two sensors with the same ID but different SN are not allowed in the meter. If a different SN has been entered for

this sensor ID previously, the old SN will be overwritten.

● Enter a different Sensor ID in order to keep the previ

ous ID and SN.

The software update process failed. This could be due to

the following reasons:

● The USB stick is not connected or it is disconnected

during the update process

● The update software is not in the correct folder

The exporting process failed. This could be due to the fol

lowing reasons:

● The USB stick is not connected or it is disconnected

during the exporting process

● The USB stick is full

8.5 	Error limits

Message Range not accepted

Out of range, determine again pH <-2.000 or > 20.000

mV <-2000.0 or > 2000.0

Buffer/standard temp. out of range T (pH) < 5 or > 50 °C

Offset out of range | Eref1-Eb | > 60 mV

Slope out of range Slope < 85% or > 110%

Wrong buffer I ∆Eref1I < 10 mV

Invalid pH for user-defined buffer I ∆pHI < 1 pH

ATC measured temperature is different

to the user-defined value

| T(ATC)T(buffer) | > 1 °C

Maintenance 41
9 	Sensors, solutions and accessories

Parts Order No.

ISM® sensors with multi-pin head

InLab®Micro Pro ISM, 3-in-1 pH sensor, glass shaft, 5 mm shaft diameter,

ATC, refillable

51344163

InLab®Power Pro ISM, 3-in-1 pH sensor, glass shaft, ATC, pressurized

SteadyForceTM reference system

51344112

InLab®Pure Pro ISM, 3-in-1 pH sensor, glass shaft, immovable glass sleeve,

ATC, refillable

51344172

InLab®Routine Pro ISM, 3-in-1 pH sensor, glass shaft, ATC, refillable 51344055

InLab®Science Pro ISM, 3-in-1 pH sensor, glass shaft, movable glass sleeve,

ATC, refillable

51344072

InLab®Solids Pro ISM, 3-in-1 pH sensor, glass shaft, open junction, sharp

membrane, ATC

51344155

ISM®cable-2 m 51344291

ISM®cable-5 m 51344292

Parts Order No.

Solutions

pH 2.00 buffer solution, 250 mL 51350002

pH 2.00 buffer solution, 6 x 250mL 51350016

pH 4.01 buffer sachets, 30 x 20mL 51302069

pH 4.01 buffer solution, 250 mL 51350004

pH 4.01 buffer solution, 6 x 250mL 51350018

pH 7.00 buffer sachets, 30 x 20mL 51302047

pH 7.00 buffer solution, 250mL 51350006

pH 7.00 buffer solution, 6 x 250mL 51350020

pH 9.21 buffer sachets, 30 x 20mL 51302070

pH 9.21 buffer solution, 250mL 51350008

pH 9.21 buffer solution, 6 x 250mL 51350022

pH 10.01 buffer sachets, 30 x 20mL 51302079

pH 10.01 buffer solution, 250mL 51350010

pH 10.01 buffer solution, 6 x 250mL 51350024

pH 11.00 buffer solution, 250 mL 51350012

pH 11.00 buffer solution, 6 x 250 mL 51350026

Rainbow I (3 x 10 sachets 20 mL 4.01/7.00/9.21) 51302068

Rainbow II (3 x 10 sachets 20 mL 4.01/7.00/10.01) 51302080

HCl/Pepsin solution (removes protein contamination) 51350100

Reactivation solution for pH electrodes 51350104

Thiourea solution (removes silver sulfide contamination) 51350102

Parts Order No.

Communication

RS-P25 printer 11124300

RS-P26 printer 11124303

RS-P28 printer 11124304

Barcode reader 21901297

USB Cable for Barcode reader 21901309

42 Sensors, solutions and accessories
Parts Order No.

LabX®direct pH PC software 51302876

Parts Order No.

Guides

Guide to ion selective measurement 51300075

Guide to pH measurement 51300047

Sensors, solutions and accessories 43
10 	Specifications

S220 pH meter

Measurement range pH -2.000...20.000

mV -2000.0...2000.0 mV

pH ATC -5...130°C

pH MTC -30...130°C

Ion

Resolution pH 0.1/0.01/0.001

mV 1/0.1

pH Temperature 0.1°C

Ion 3 or 4 digits

Limits of error pH ± 0.002 pH

± 0.2 mV

± 0.1°C

Limits of error ion ± 0.5% (this limit only applies

for meter)

pH calibration Up to 5 points

Isopotential point pH 7.00

pH Calibration buffer 7 predefined groups 1 user-defined group of 5 buffers

Outputs RS232, USB A, USB B

Power requirements DC9-12V-10W

Size/weight 204 x 174 x 74 mm

890 g

Display TFT

pH input BNC,

impedance >

3 * 10e+12 Ω

Temperature input RCA (Cinch), NTC 30kΩ,

Pt1000

Digital sensor input Mini-LTW

Ambient conditions Temperature 5...40°C

Relative humidity 5%...80% (non-condensing)

Installation category II

Pollution degree 2

Altitude Up to 2000 m above sea level

Materials Housing ABS/PC reinforced

Window Polymethyl methacrylate

(PMMA)

Keypad Membrane keypad: Polyethe

lene terephtalate (PET)

0.000...1000.0%

0.000...10000 ppm

1.00E-9...9.99E+9 mg/L

1.00E-9...9.99E+9 mmol/L

1.00E-9...9.99E+9 mol/L

44 Specifications
11 	Appendix

11.1 	Buffer tables

The meters automatically correct for the temperature dependence of the pH buffer using the values

given in the tables below.

11.1.1 	Buffer group 1 (ref. 25 °C) METTLER TOLEDO US

5 7.09 4.00 10.25 1.67

10 7.06 4.00 10.18 1.67

15 7.04 4.00 10.12 1.67

20 7.02 4.00 10.06 1.68

25 7.00 4.00 10.01 1.68

30 6.99 4.01 9.97 1.68

35 6.98 4.02 9.93 1.69

40 6.97 4.03 9.89 1.69

45 6.97 4.04 9.86 1.70

50 6.97 4.06 9.83 1.71

11.1.2 	Buffer group 2 (ref. 25 °C) METTLER TOLEDO Europe (default buffer)

5 7.09 4.01 9.45 2.02 11.72

10 7.06 4.00 9.38 2.01 11.54

15 7.04 4.00 9.32 2.00 11.36

20 7.02 4.00 9.26 2.00 11.18

25 7.00 4.01 9.21 2.00 11.00

30 6.99 4.01 9.16 1.99 10.82

35 6.98 4.02 9.11 1.99 10.64

40 6.97 4.03 9.06 1.98 10.46

45 6.97 4.04 9.03 1.98 10.28

50 6.97 4.06 8.99 1.98 10.10

Appendix 45
11.1.3 	Buffer group 3 (ref. 20 °C) Merck standard buffers

5 7.07 4.04 9.16 2.01 12.41

10 7.05 4.02 9.11 2.01 12.26

15 7.02 4.01 9.05 2.00 12.10

20 7.00 4.00 9.00 2.00 12.00

25 6.98 4.01 8.95 2.00 11.88

30 6.98 4.01 8.91 2.00 11.72

35 6.96 4.01 8.88 2.00 11.67

40 6.95 4.01 8.85 2.00 11.54

45 6.95 4.01 8.82 2.00 11.44

50 6.95 4.00 8.79 2.00 11.33

11.1.4 	Buffer group 4 (ref. 25 °C) DIN (19266)

5 6.95 4.00 9.40 1.67

10 6.92 4.00 9.33 1.67

15 6.90 4.00 9.28 1.67

20 6.88 4.00 9.22 1.68

25 6.86 4.01 9.18 1.68

30 6.85 4.02 9.14 1.68

35 6.84 4.02 9.10 1.69

40 6.84 4.04 9.07 1.69

45 6.83 4.05 9.04 1.70

50 6.83 4.06 9.01 1.71

11.1.5 	Buffer group 5 (ref. 25 °C) DIN (19267)

5 1.08 4.67 6.87 9.43 13.63

10 1.09 4.67 6.84 9.37 13.37

15 1.09 4.66 6.82 9.32 13.16

20 1.09 4.66 6.80 9.27 12.96

25 1.09 4.65 6.79 9.23 12.75

30 1.10 4.65 6.78 9.18 12.61

35 1.10 4.65 6.77 9.13 12.45

40 1.10 4.66 6.76 9.09 12.29

45 1.10 4.67 6.76 9.04 12.09

50 1.11 4.68 6.76 9.00 11.98

46 Appendix
11.1.6 	Buffer group 6 (ref. 25 °C) JJG (Chinese)

5 1.669 3.999 6.949 9.391 13.210

10 1.671 3.996 6.921 9.330 13.011

15 1.673 3.996 6.898 9.276 12.820

20 1.676 3.998 6.879 9.226 12.637

25 1.680 4.003 6.864 9.182 12.460

30 1.684 4.010 6.852 9.142 12.292

35 1.688 4.019 6.844 9.105 12.130

40 1.694 4.029 6.838 9.072 11.975

45 1.700 4.042 6.834 9.042 11.828

50 1.706 4.055 6.833 9.015 11.697

11.1.7 	Buffer group 7 (ref. 25 °C) Technical Buffer

5 2.02 4.01 7.09 10.65

10 2.01 4.00 7.06 10.39

15 2.00 4.00 7.04 10.26

20 2.00 4.00 7.02 10.13

25 2.00 4.01 7.00 10.00

30 1.99 4.02 6.99 9.87

35 1.99 4.02 6.98 9.74

40 1.98 4.03 6.97 9.61

45 1.98 4.04 6.97 9.48

50 1.98 4.06 6.97 9.35

11.1.8 	Buffer group 8 (ref. 25 °C) JIS Z 8802 (Japanese)

5 1.668 3.999 6.951 9.395

10 1.670 3.9998 6.923 9.332

15 1.672 3.999 6.900 9.276

20 1.675 4.002 6.881 9.225

25 1.679 4.008 6.865 9.180

30 1.683 4.015 6.853 9.139

35 1.688 4.024 6.844 9.102

40 1.694 4.035 6.838 9.068

45 1.700 4.047 6.834 9.038

50 1.704 4.060 6.833 9.011

Appendix 47