Wtw InoLab Multi 720 Manual de usuario

inoLab

Multi 720

ba75442e01 03/2004

ba75442e

Operating Manual

Measuring Instrument

for pH, Redox, Dissolved Oxygen

and Conductivity

Multi

720

Accuracy when

going to press The use of advanced technology and the high quality stan-

dard of our instruments are the result of continuous develop-

ment. This may result in differences between this operating

manual and your instrument.

We cannot guarantee that there are absolutely no errors in

this manual. We are sure you willunderstand that we cannot

accept any legal claims resulting from the data, figures or

descriptions.

Warranty declara-

tion The designated instrument is covered by a warranty of three

years from the date of purchase.

The instrument warranty extends to manufacturing faults

that are determined within the period of warranty.

Thewarrantyexcludescomponentsthatarereplacedduring

maintenance such as batteries, etc.

The warranty claim extends to restoring the instrument to

readiness for use but not, however, to any further claim for

damages. Improperhandlingor unauthorized openingof 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.

Reprinting - even as excerpts - is only allowed with the ex-

plicit written authorization of WTW GmbH, Weilheim.

Printed in Germany.

Multi 720 Contents

1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

1.1 Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

1.2 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

1.3 Sockets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

1.4 Operating structure. . . . . . . . . . . . . . . . . . . . . . 90

2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

2.1 Authorized use . . . . . . . . . . . . . . . . . . . . . . . . . 92

2.2 General safety instructions. . . . . . . . . . . . . . . . 92

3 Commissioning. . . . . . . . . . . . . . . . . . . . . . . . . 95

4 Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

4.1 Switch on the instrument . . . . . . . . . . . . . . . . . 97

4.2 Measuring the pH value/Redox voltage . . . . . . 98

4.2.1 Measuring the pH value . . . . . . . . . . . 100

4.2.2 Measuring the Redox voltage . . . . . . . 101

4.3 Calibrating for pH measurements. . . . . . . . . . 102

4.3.1 AutoCal TEC . . . . . . . . . . . . . . . . . . . . 104

4.3.2 AutoCal DIN . . . . . . . . . . . . . . . . . . . . 106

4.3.3 ConCal . . . . . . . . . . . . . . . . . . . . . . . . 108

4.4 Measuring the dissolved oxygen . . . . . . . . . . 111

4.4.1 Oxygen concentration . . . . . . . . . . . . . 112

4.4.2 Oxygen saturation . . . . . . . . . . . . . . . . 113

4.4.3 Oxygen partial pressure . . . . . . . . . . . 114

4.4.4 AutoRead AR (drift control) . . . . . . . . . 114

4.5 Calibrating for D. O. measurements. . . . . . . . 116

4.5.1 Starting the calibration. . . . . . . . . . . . . 118

4.5.2 Entering the salt content (salinity) . . . . 120

4.6 Measuring the conductivity. . . . . . . . . . . . . . . 121

4.6.1 Conductivity / Specific resistance . . . . 123

4.6.2 Salinity. . . . . . . . . . . . . . . . . . . . . . . . . 124

4.6.3 TDS (total dissolved solids). . . . . . . . . 125

4.6.4 AutoRead AR (Drift control). . . . . . . . . 126

4.7 Determining/setting up the cell constant [C]. . 127

4.7.1 Determining the cell constant

(calibration in control standard). . . . . . 127

Contents Multi 720

4.7.2 Setting up the cell constant . . . . . . . . . 130

4.8 Setting up the temperature compensation TC 133

4.9 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . 137

4.10 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140

5 Maintenance, cleaning, disposal. . . . . . . . . . 143

5.1 Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . 143

5.2 Cleaning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144

5.3 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144

6 What to do if.... . . . . . . . . . . . . . . . . . . . . . . . . 145

6.1 pH system messages. . . . . . . . . . . . . . . . . . . 145

6.2 Oxygen system messages . . . . . . . . . . . . . . . 147

6.3 Conductivity system messages . . . . . . . . . . . 149

6.4 General errors . . . . . . . . . . . . . . . . . . . . . . . . 149

7 Technical Data . . . . . . . . . . . . . . . . . . . . . . . . 151

7.1 General data. . . . . . . . . . . . . . . . . . . . . . . . . . 151

7.2 pH/Redox measurement . . . . . . . . . . . . . . . . 153

7.3 Oxygen measurement . . . . . . . . . . . . . . . . . . 154

7.4 Conductivity measurement. . . . . . . . . . . . . . . 155

8 Lists. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157

Multi 720 Overview

1Overview

The compact inoLab Multi 720 precision measuring instru-

ment lets you perform pH, Redox, D. O., and conductivity

measurements rapidly and reliably. The inoLab Multi 720

provides the highest degree of operating comfort, reliability

and measuring safety for all applications.

The proven OxiCal®and MultiCal®calibration procedures

and special AutoRead function support your work with the

instrument.

Note

The measuring instrument can also be delivered as part of

a set.

Information on this and other accessories is available in the

WTW catalog LABORATORY AND FIELD INSTRUMENTATION or

via the Internet.

1Keypad

2Display

3Sockets

Multi

720

Overview Multi 720

1.1 Keypad

1Measuring instrument ON/OFF

2Select measuring mode

3Call up calibration procedure

4Activate/deactivate AutoRead

5Confirm inputs, start AutoRead

6Select measuring mode, increase values,

scroll

7Select measuring mode, reduce values,

scroll

Multi 720 Overview

1.2 Display

1.3 Sockets

Caution

Only connect probes to the instrument that cannot feed ex-

cessive voltages or currents (> SELV and > circuit with cur-

rent limiter). Almost all commercial electrodes - especially

WTW electrodes - meet these requirements.

On socket 4, use the WTW probe StirrOx G only.

Connectors:

1Dissolved oxygen probe or conductivity measuring cell

2pH/Redox electrode

3Temperature probe

4Stirrer (StirrOx G)

5Reference electrode

6Mains power supply (option)

tatus

Measured value display

Function and

temperature display

1234

Overview Multi 720

1.4 Operating structure

Thefollowingoverviewdiagram shows which keysyouhave

to press to select between the different measuring modes:

Note

When a D. O. probe or a conductivity measuring cell with

temperature probe is connected, the measuring instrument

recognizes the probe or measuring cell and automatically

switches to the oxygen measuring mode or conductivity

measuring mode last selected. As soon as the probe/mea-

suring cell is disconnected, the instrument switches to the

pH or Redox measuring mode.

Multi 720 Safety

2 Safety

This operating manual contains basic instructions that you

must follow during the commissioning, operation and main-

tenance of the instrument. Consequently, all responsible

personnel must read this operating manual before working

with the instrument.

The operating manual must always be available within the

vicinity of the instrument.

Target group This measuring instrument was developed for use in the lab-

oratory.

Thus, we assume that, as a result of their professional train-

ing and experience, the operators will know the necessary

safety precautions to take when handling chemicals.

Symbols used

Caution

indicates instructions that have to be followed to prevent

damage to your instrument.

Warning

indicates instructions that have to be followed to protect

yourself and the instrument from dangerous electrical volt-

age.

Note

Indicates notes that draw your attention to special features.

Note

Indicates cross-references to other documents, e.g. appli-

cation reports, operating manuals of combination elec-

trodes, etc.

Safety Multi 720

2.1 Authorized use

This instrument is authorized exclusively for measuring the

pH, Redox, dissolved oxygen and conductivity in the labora-

tory.

Thetechnicalspecifications asgiven inchapter7TECHNICAL

DATA, must be observed. Only the operation and running of

themeasuringinstrumentaccordingtotheinstructionsgiven

in this operating manual is authorized.

Any other use is considered unauthorized.

2.2 General safety instructions

Thisinstrumentisconstructedandtestedincompliancewith

the EN 61010-1 safety regulations for electronic measuring

instruments.

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

Function and opera-

tional safety The smooth functioning and operational safety of the instru-

ment can only be guaranteed if the generally applicable

safety measures and the specific safety instructions in this

operating manual are followed.

The smooth functioning and operational safety of the instru-

ment can only be guaranteed under the climatic conditions

specified in chapter 7 TECHNICAL DATA.

Iftheinstrumentwas transported from acoldenvironmentto

a warm environment, the formation of condensate can lead

to the faulty functioning of the instrument. In this event, wait

until the temperature of the instrument reaches room tem-

perature before putting the instrument back into operation.

Caution

The instrument is only allowed to be opened by personnel

authorized by WTW.

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