wtw inoLab pH/ION 735 Operating instructions

inoLab pH/ION 735

ba75449e02 03/2005

Operating manual

pH/ION meter

p

H

/IO

N

735

Accuracy when

going to press

The use of advanced technology and the high quality standard of our

instruments are the result of a continuous development. This may

result in differences between this operating manual and your

instrument. Also, we cannot guarantee that there are absolutely no

errors in this manual. Therefore, we are sure you will understand that

we cannot accept any legal claims resulting from the data, figures or

descriptions.

Warranty We guarantee the instrument described for 3 years from the date of

purchase.

The instrument warranty covers manufacturing faults that are

discovered within the warranty period.

The warranty does not cover components that are replaced during

maintenance work, e. g. rechargeable batteries.

The warranty claim extends to restoring the instrument to readiness for

use but not, however, to any further claim for damages. Improper

handling or unauthorized opening of the instrument invalidates any

warranty claim.

To ascertain the warranty liability, return the instrument and proof of

purchase together with the date of purchase freight paid or prepaid.

Topicality of firmware The continuous development of our meter software is part of the

process of consequently improving our products. The current meter

software for the inoLab pH/ION 735 can be found on the Internet. It can

easily be transmitted to your meter with the aid of the supplied

AK 340/B cable and a PC.

More information is given in the appendix of this operating manual or

on the Internet under http://www.WTW.com.

Copyright

Reproduction in whole - or even in part - is prohibited without the

express written permission of WTW GmbH, Weilheim.

Printed in Germany.

inoLab pH/ION 735 Contents

3

1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.1 General features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.2 Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.3 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1.4 Socket field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.1 Authorized use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.2 General safety instructions . . . . . . . . . . . . . . . . . . . . . . . 10

3 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

3.1 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

3.2 Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

3.3 Initial commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

4 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4.1 Switching on the meter . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4.2 General operating principles . . . . . . . . . . . . . . . . . . . . . 14

4.2.1 Operating modes . . . . . . . . . . . . . . . . . . . . . . . . 14

4.2.2 Navigation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4.2.3 Navigation example 1: Setting the language . . . 17

4.2.4 Navigation example 2: Setting the date and time 19

4.3 System settings (system menu) . . . . . . . . . . . . . . . . . . . 21

4.3.1 Data storage . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

4.3.2 System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

4.4 pH value / ORP voltage . . . . . . . . . . . . . . . . . . . . . . . . . 23

4.4.1 General information . . . . . . . . . . . . . . . . . . . . . . 23

4.4.2 Measuring the pH value . . . . . . . . . . . . . . . . . . 24

4.4.3 Measuring the ORP voltage . . . . . . . . . . . . . . . 25

4.4.4 Settings for pH and ORP measurements . . . . . 25

4.4.5 pH calibration . . . . . . . . . . . . . . . . . . . . . . . . . . 27

4.4.6 Carrying out the TEC and NIST/DIN calibration 30

4.4.7 Carrying out a ConCal calibration . . . . . . . . . . . 34

4.5 Ion concentration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

4.5.1 General information . . . . . . . . . . . . . . . . . . . . . . 37

4.5.2 Measuring the ion concentration . . . . . . . . . . . . 38

4.5.3 Settings for ISE measurements . . . . . . . . . . . . 38

4.5.4 Calibrating for ISE measurements . . . . . . . . . . 40

4.5.5 Selecting the measuring method . . . . . . . . . . . . 45

4.5.6 Standard addition (Std. add.) . . . . . . . . . . . . . . 46

4.5.7 Standard subtraction (Std. sub.) . . . . . . . . . . . . 48

4.5.8 Sample addition (Sample add.) . . . . . . . . . . . . . 51

4.5.9 Sample subtraction (Sample sub.) . . . . . . . . . . 53

4.5.10 Standard addition with blank value correction

(Blank add.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Contents inoLab pH/ION 735

4

4.6 Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

4.6.1 Manual storage . . . . . . . . . . . . . . . . . . . . . . . . . 59

4.6.2 Automatic storage at intervals . . . . . . . . . . . . . . 60

4.6.3 Editing the measured value storage . . . . . . . . . 62

4.6.4 Erasing the measured value storage . . . . . . . . . 65

4.6.5 Displaying and outputting calibration records . . 66

4.7 Transmitting data (RS 232 interface) . . . . . . . . . . . . . . . 68

4.7.1 Options for data transmission . . . . . . . . . . . . . . 68

4.7.2 Connecting a PC/external printer . . . . . . . . . . . . 69

4.7.3 Operation with MultiLab pilot . . . . . . . . . . . . . . . 69

4.8 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

4.8.1 Resetting the sensor settings . . . . . . . . . . . . . . 70

4.8.2 Resetting the system settings . . . . . . . . . . . . . . 71

5 Maintenance, cleaning, disposal . . . . . . . . . . . . . . . . . 73

5.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

5.1.1 Exchanging the rechargeable batteries . . . . . . . 74

5.1.2 Exchanging the roll of paper . . . . . . . . . . . . . . . 75

5.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

5.3 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

6 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

6.1 pH and ORP measurement . . . . . . . . . . . . . . . . . . . . . . 77

6.2 ISE measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

6.3 General errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

7 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

7.1 General data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

7.2 Measuring ranges, resolution, accuracy . . . . . . . . . . . . . 84

7.2.1 pH/ORP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

7.2.2 ISE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

8 Lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

9 Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

Appendix: Updating the meter software . . . . . . . . . . . . . . . 91

inoLab pH/ION 735 Overview

5

1Overview

1.1 General features

The inoLab pH/ION 735 compact precision pH meter enables you to

carry out pH measurement, ORP measurements and concentration

measurements with ion sensitive electrodes quickly and reliably.

The inoLab pH/ION 735 provides the maximum degree of operating

comfort, reliability and measuring certainty for all applications.

The integrated printer* enables to document measurements according

to GLP requirements.

The proven MultiCal

®

calibration procedures and the special AutoRead

function support you in your work with the meter.

Note

If you need further information or application notes, you can obtain the

following material from WTW:

! Application reports

! Primers

! Safety datasheets.

You will find information on available literature in the WTW catalog or

via the Internet.

* only on the inoLab pH/ION 735 with integrated printer

1 Keypad

2 Display

3 Socket field

4 Printer*

pH

/IO

N

735

3

2

1

4

Overview inoLab pH/ION 735

6

1.2 Keypad

1 Paper feed / line feed*

(switch printer off - Print LED lights up red)

* only on the inoLab pH/ION 735 with integrated printer

2 Switch printer on or off*

3 Print-LED*

red: printer off (off-line) or malfunction

green: printer ready for operation (on-line)

4 Call up calibration procedure

5 Switch between measuring mode pH/ORP and measuring

mode ISE concentration

6 Transmit / print displayed data

7 Switch the meter on/off

8 Cancel inputs

9 Store a measured value

10 Switch between pH measurement and ORP measurement, in-

crease values, scroll

11 Confirm entries, start AutoRead

12 Switch between pH measurement and ORP measurement,

decrease values, scroll

1

2

3

4

9

10

11

5

6

7

8

12

inoLab pH/ION 735 Overview

7

1.3 Display

The graphical display can indicate up to three measuring windows at

the same time. The illumination enables to read the display even in the

darkness. You can modify the display to meet your requirements in

multiple ways.

1.4 Socket field

Connections:

1 pH-Ion electrode

2 Temperature probe

3 Reference electrode

4 RS 232 interface/analog output

5 Power pack

pH

6.949

25.0

°C

05.08.04 09:25

Measured variable

Measured value (with unit)

Sensor symbol

Temperature display

Status line

1

2

3

4

5

Overview inoLab pH/ION 735

8

Warning

Only connect sensors to the meter that cannot return any voltages or

currents that are not allowed (> SELV and > current circuit with current

limiting).

Almost all sensors - in particular WTW sensors - fulfill these conditions.

inoLab pH/ION 735 Safety

9

2 Safety

This operating manual contains basic instructions that you must follow

during the commissioning, operation and maintenance of the meter.

Consequently, all responsible personnel must read this operating man-

ual before working with the measuring system. The operating manual

must always be available within the vicinity of the measuring system.

Target group The meter was developed for work in the laboratory.

We assume that, as a result of their professional training and experi-

ence, the operators will know the necessary safety precautions to take

when handling chemicals.

Safety instructions The individual chapters of this operating manual use the following safe-

ty instruction to indicate various types of danger:

Warning

indicates instructions that must be followed precisely in order to

avoid the possibility of slight injuries or damage to the instrument

or the environment.

Further notes

Note

indicates notes that draw your attention to special features.

Note

indicates cross-references to other documents, e.g. operating manu-

als.

2.1 Authorized use

This meter is authorized exclusively for pH, ORP and ISE concentra-

tions measurements in the laboratory.

The technical specifications as given in chapter 7 T

ECHNICAL DATA must

be observed. Only the operation and running of the meter according to

the instructions given in this operating manual is authorized. Any other

use is considered to be unauthorized.

Safety inoLab pH/ION 735

10

2.2 General safety instructions

This instrument is built and inspected according to the relevant guide-

lines and norms for electronic meters (see chapter 7 T

ECHNICAL DATA).

It left the factory in a safe and secure technical condition.

Function and operating

safety

The smooth functioning and operational safety of the meter can only be

guaranteed if the generally applicable safety measures and the specific

safety instructions in this operating manual are followed during opera-

tion.

The smooth functioning and operational safety of the meter can only be

guaranteed under the environmental conditions that are specified in

chapter 7 T

ECHNICAL DATA.

If the instrument was transported from a cold environment to a warm

environment, the formation of condensate can lead to the faulty func-

tioning of the instrument. In this event, wait until the temperature of the

instrument reaches room temperature before putting the instrument

back into operation.

Safe operation If safe operation is no longer possible, the instrument must be taken out

of service and secured against inadvertent operation!

Safe operation is no longer possible if the meter:

! has been damaged in transport

! has been stored under adverse conditions for a lengthy period of

time

! is visibly damaged

! no longer operates as described in this manual.

If you are in any doubt, please contact the supplier of the instrument.

Obligations of the

purchaser

The purchaser of this meter must ensure that the following laws and

guidelines are observed when using dangerous substances:

! EEC directives for protective labor legislation

! National protective labor legislation

! Safety regulations

! Safety datasheets of the chemical manufacturers.

inoLab pH/ION 735 Commissioning

11

3 Commissioning

3.1 Scope of delivery

! inoLab pH/ION 735 laboratory meter

! Operating manual and short instructions in the printer cover

! 4 NiMH rechargeable batteries 1.2 V Mignon type AA

! Power pack

3.2 Power supply

Line-powered operation

and charging the batter-

ies

You can operate the meter either with the built-in rechargeable batter-

ies or with the power pack. The power pack supplies the meter with low

voltage (9 V DC). At the same time, the rechargeable batteries are

charged. The batteries are charged even when the instrument is

switched off.

Warning

Always use the specified NiMH rechargeable batteries (see chap-

ter 7 T

ECHNICAL DATA). Using normal batteries can damage the

meter.

Charging time of the

batteries

approx. 36 hours. The LoBat display indicator appears when the batter-

ies are nearly empty and have to be charged as soon as possible.

Warning

The line voltage at the operating site must lie within the input volt-

age range of the original power pack (see chapter 7 T

ECHNICAL DA-

TA).

Warning

Use original power packs only (see chapter 7 TECHNICAL DATA).

Note

The batteries should not be completely discharged. If you do not oper-

ate the instrument for a longer period of time you should charge the bat-

teries every six months.

Automatic switchoff The instrument has an automatic switchoff function in order to save the

batteries (see section 4.3.2).

Commissioning inoLab pH/ION 735

12

Display illumination

with battery operation

To save the batteries, the meter has a switchoff function for the display

illumination that can be switched on and off (see section 4.3.2).

Note

You can carry out measurements without the power pack. The func-

tions of the integrated printer*, however, can only be used if the power

pack is connected.

3.3 Initial commissioning

Perform the following activities:

! For line-powered operation and charging the batteries: Connect the

power pack (see section 3.2 P

OWER SUPPLY).

! Switch on the meter (see section 4.1)

! Set the language (see section 4.2.3)

! Set the date and time (see section 4.2.4)

Note

When you set the language, date and time according to the mentioned

sections of this operating manual you will quickly be familiar with the

simple operation of the inoLab pH/ION 735.

1 Connect the plug (1) to the socket (2) of the meter.

2 Connect the original WTW power pack (3) to an easily

accessible power socket.

* only on the inoLab pH/ION 735 with integrated printer

1

2

3

inoLab pH/ION 735 Operation

13

4 Operation

4.1 Switching on the meter

Switching on Press the e key.

The measured value display appears.

Switching off Press the e key.

Automatic switchoff The instrument has an automatic switchoff function in order to save the

batteries (see section 4.3.2). The automatic switchoff switches off the

meter if no key is pressed for an adjustable period.

The automatic switchoff is not active

! if the power is supplied by the power pack,

! if the Autostore function is active, or with automatic data transmis-

sion

! if the communication cable and a PC with a running communication

program are connected,

! if the printer cable is connected (for external printers).

Display illumination

with battery operation

During battery operation, the meter automatically switches off the dis-

play illumination if no key has been pressed for 15 seconds. The illumi-

nation is switched on with the next keystroke again.

pH

6.949

25.0

°C

20.09.04 10:37

Operation inoLab pH/ION 735

14

4.2 General operating principles

This section contains basic information of the operation of the inoLab

pH/ION 735.

Operating elements,

display

An overview of the operating elements and the display is given in

section 1.2 and section 1.3.

Operating modes,

navigation

An overview of the operating modes and navigation of the inoLab pH/

ION 735 is given in section 4.2.1 and section 4.2.2.

4.2.1 Operating modes

The instrument has the following operating modes:

! Measuring

The measuring data of one to three sensors is displayed in the

measured value display

! Calibration

The course of a calibration with calibration information, functions

and settings is displayed

! Storage

The meter stores measuring data automatically or manually

! Transmitting data

The meter transmits measuring data and calibration records to the

serial interface automatically or manually.

! Setting

The system menu or a sensor menu with submenus, settings and

functions is displayed

inoLab pH/ION 735 Operation

15

4.2.2 Navigation

Measured value display In the measured value display, you can

! select a measuring window with 82 and

open the relevant measuring menu by shortly

pressing g.

! open the system menu with the sensor-independent settings by

pressing g for a long

time (approx. 1 s).

! change the display in the selected measuring window (e. g. pH <−>

mV) by pressing m.

Menus and dialogs The menus for settings and dialogs in courses contain further sub-

menus. The selection is made with the 82 keys. The current selec-

tion is displayed in reverse video.

! Submenus

The name of the submenu is displayed at the upper edge of the

frame. Submenus are opened by confirming with g.

Example:

! Settings

Settings are indicated by a colon. The current setting is displayed on

the right-hand side. The setting mode is opened with g. Subse-

quently, the setting can be changed with 82 and g.

Example:

General

Interface

Clock function

Reset

System

Language: Deutsch

Beep: Off

Illumination: On

Contrast

: 48 %

Temperature unit: °C

Switchoff time: 30 min

System

Operation inoLab pH/ION 735

16

! Functions

Functions are designated by the name of the function. They are im-

mediately carried out by confirming with g.

Example: Display the Calibration record function.

Messages Information or operating instructions are designated by the i symbol.

They cannot be selected.

Example:

Note

The principles of navigation are explained in the two following sections

by reference of examples:

! Set the language (see section 4.2.3)

! Set the date and time (see section 4.2.4).

Cal. type: TEC

Calibration interval

: 7 d

Unit for slope: mV/pH

Calibration record

:

i 2.00 4.01 7.00 10.01

pH

i Buffer recognition TEC

i Immerse sensor in buffer 1

Set temperature: 25 °C

Continue

pH

inoLab pH/ION 735 Operation

17

4.2.3 Navigation example 1: Setting the language

1 Press the e key.

The measured value display appears.

The instrument is in the measuring mode.

2 Open the system menu by pressing g for a long time

(approx. 1 s).

The instrument is in the setting mode.

3 Select the System submenu with 82.

The current selection is displayed in reverse video.

4 Open the System

submenu with g.

5 Select the General submenu with 82.

The current selection is displayed in reverse video.

pH

7.00

25.0

°C

20.09.04 10:37

Data storage

System

Storage & config

General

Interface

Clock function

Service information

Reset

System

Operation inoLab pH/ION 735

18

6 Open the General submenu with g.

7 Open the setting mode for the Language with g.

8 Select the required language with 82.

9 Confirm the setting with g.

The setting becomes active the next time the system menu is

called up.

Language: Deutsch

Beep

: Off

Illumination: On

Contrast: 48 %

Temperature unit

: °C

Switchoff time: 30 min

System

Language: Deutsch

Beep

: Off

Illumination: On

Contrast: 48 %

Temperature unit

: °C

Switchoff time: 30 min

System

inoLab pH/ION 735 Operation

19

4.2.4 Navigation example 2: Setting the date and time

The meter has a clock with a date function. The date and time are indi-

cated in the status line of the measured value display. The indication

can be switched off. When storing measured values and calibrating, the

current date and time are automatically stored as well.

The correct setting of the date and time and date format is important for

the following functions and displays:

! Current date and time

! Calibration date

! Identification of stored measured values.

Therefore, check the time at regular intervals.

Note

After a fall of the supply voltage (empty batteries), the date and time are

reset to 01.01.2003, 00:00 hours.

Setting the date, time

and date format

The data format can be switched from the display of day, month, year

(dd.mm.yy) to the display of month, day, year (mm/dd/yy or mm.dd.yy).

1 In the measured value display:

Open the system menu by pressing g for a long

time

(approx. 1 s).

The instrument is in the setting mode.

2 Select and confirm the System / Clock function menu with

82 and g.

The setting menu for the date and time appears.

3 Select and confirm Time with 82 and g.

The seconds are highlighted.

4 Change and confirm the setting with 82 and g.

The minutes are highlighted.

5 Change and confirm the setting with 82 and g.

The hours are highlighted.

Time: 14:53:40

Date: 30.10.03

Date format

: dd.mm.yy

System

Operation inoLab pH/ION 735

20

6 Change and confirm the setting with 82 and g.

The time is set.

7 If necessary, set the Date and Date format. The setting is made

similarly to that of the time.

8 If necessary, select and set the Date with 82 and g.

9 To make further settings, switch to the next higher menu level

with #.

or

Switch to the measured value display with m.

The instrument is in the measuring mode.

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wtw inoLab pH/ION 735 Operating instructions

wtw inoLab pH/ION 735 Operating instructions

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