Xylem MULTI-1970I User Manual

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Multi 1970i

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Multi 1970i

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Operating manual

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Multi 1970i

Portable pH / oxygen / conductivity measuring instrument

ba75693e01 01/2007

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.

Copyright

Reproduction in whole - or even in part - is prohibited without the express written permission of WTW GmbH, Weilheim. Printed in Germany.

Multi 1970i List of contents

1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.1 General features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.2 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.3 Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.4 Jack field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

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

3.4 Sensor quiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

4 Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4.1 Operating structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4.2 Switching on the measuring instrument . . . . . . . . . . . . . 16

4.3 pH value / ORP voltage . . . . . . . . . . . . . . . . . . . . . . . . . 17

4.3.1 General information . . . . . . . . . . . . . . . . . . . . . . 17

4.3.2 Measuring the pH value . . . . . . . . . . . . . . . . . . 19

4.3.3 Measuring the ORP voltage . . . . . . . . . . . . . . . 20

4.3.4 pH calibration . . . . . . . . . . . . . . . . . . . . . . . . . . 21

4.4 Dissolved oxygen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

4.4.1 General information . . . . . . . . . . . . . . . . . . . . . . 27

4.4.2 Measuring the D. O. concentration . . . . . . . . . . 29

4.4.3 Measuring the D. O. saturation . . . . . . . . . . . . . 30

4.4.4 AutoRead AR (Drift control) and hold function . 31

4.4.5 D. O. calibration . . . . . . . . . . . . . . . . . . . . . . . . 32

4.4.6 Entering the salt content (salinity) . . . . . . . . . . . 35

4.5 Conductivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

4.5.1 General information . . . . . . . . . . . . . . . . . . . . . . 36

4.5.2 Measuring the conductivity . . . . . . . . . . . . . . . . 38

4.5.3 Measuring the salinity . . . . . . . . . . . . . . . . . . . . 38

4.5.4 AutoRead AR (Drift control) and hold function . 39

4.5.5 Determining the cell constant (Calibration in the

control standard) . . . . . . . . . . . . . . . . . . . . . . . . 40

4.6 Calibration intervals (Int 3, Int 4, Int 5) . . . . . . . . . . . . . . 43

4.7 Saving data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

4.7.1 Saving manually . . . . . . . . . . . . . . . . . . . . . . . . 44

4.7.2 Switching on AutoStore (Int 1) . . . . . . . . . . . . . 46

4.7.3 Outputting the data storage . . . . . . . . . . . . . . . . 48

4.7.4 Clearing the memory . . . . . . . . . . . . . . . . . . . . . 54

4.8 Transmitting data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

1

List of contents Multi 1970i

4.8.1 Data transmission interval (Int 2) . . . . . . . . . . . . 55

4.8.2 PC/external printer (RS232 interface) . . . . . . . . 57

4.8.3 Remote control . . . . . . . . . . . . . . . . . . . . . . . . . 57

4.9 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

4.10 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

5 Maintenance, cleaning, disposal . . . . . . . . . . . . . . . . . 65

5.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

5.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

5.3 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

6 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

6.1 pH system messages . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

6.2 Oxi system messages . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

6.3 Conductivity system messages . . . . . . . . . . . . . . . . . . . 70

6.4 General errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

7 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

7.1 General data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

7.2 Measuring ranges, resolutions, accuracies . . . . . . . . . . 74

7.2.1 pH/ORP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

7.2.2 Dissolved oxygen . . . . . . . . . . . . . . . . . . . . . . . . 75

7.2.3 Conductivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

8 Lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

2

Multi 1970i Overview

RUN / ENTER

Multi 1970i

1Overview

1.1 General features

The Multi 1970i portable multiparameter measuring instrument enables you to carry out pH measurements, dissolved oxygen (D. O.) measurements and conductivity measurements quickly and reliably. The Multi 1970i provides the maximum degree of operating comfort, reliability and measuring certainty for all applications.

The proven MultiCal

®

and OxiCal® calibration procedures and the procedures to determine/set up the cell constant support you in your work with the meter. The special AutoRead function enables precise measurements.

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Multi 1970i

3

4

5

1 Keypad

2 Display

3 Integrated, exchangeable sensor quiver

4 Jack field

5 Carrying and positioning handle

3

Overview Multi 1970i

Note

If you need further information or application notes, you can obtain the following material from WTW:

z Application reports

z Primers

z Safety datasheets.

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

1.2 Display

Status display indicator

pH

S

O

Sal

1

Time

Day.Month

Year

LoBat nLF

8

88

Baud

No.

Ident

8 8 8 8

Tref25 Tref20

Lin

Auto

Oxi

Cal

Store

TEC

ARng

%

m

1/

°

S/

cm

%

C

REL1

pHmV/

mg/l

cm

K

/

REL2

AR

Sal

TP

RCL

Sensor symbol

Measured value display

Function and temperature display

4

Multi 1970i Overview

RCL

STO

1.3 Keypad

Key functions

ON / OFF

M

CAL

AUTO READ

RUN / ENTER

Calibrate the currently set measured variable

Switch measuring instrument on/off

Select the measured variable <M>:

– pH value / ORP voltage

– D. O. concentration / D. O. saturation

– Conductivity / salinity

<CAL>

Activate/deactivate the AutoRead function

Confirm entries, start AutoRead, output measured values

Select the measuring mode, increase values, scroll

<▲ >

Select the measuring mode, decrease values, scroll

<▼ >

RCL

STO

Display/transmit measured values

<RCL>

Save a measured value

<STO>

1.4 Jack field

Warning

Only connect sensors to the measuring instrument 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.

5

Overview Multi 1970i

Maximum number

of sensors to be con-

nected

Connectors:

The following sensors can be connected to the Multi 1970i (maximum configuration):

z One pH depth armature or

one pH electrode (combination electrode or pH electrode + reference electrode). Please make sure that only one pH sensor is connected at the same time.

z One D. O. sensor

z One conductivity measuring cell

z Option: One external temperature sensor

Note

The pH depth armature is affected by other sensors if it is connected to them galvanically. For this reason, the pH depth armature cannot be operated in the same test sample together with another sensor on the instrument.

5

1

7

8

6

9

2

4

3

Sensor / Instrument Socket / Posi-

tion

pH depth armature 1

pH electrode or pH combination electrode 2

pH combination electrode with temperature sensor 2 and 4

Reference electrode 3

Temperature sensor, external 3 and 4

Oxygen sensor 5 or 6

Conductivity measuring cell 5 or 6

Printer or PC (serial interface, RS232) 7

Plug-in power supply unit 8

Watertight valve for internal pressure equalization 9

6

Multi 1970i Overview

Note

The sensor sockets, 1 and 2 must not be assigned at the same time. On the two sockets, 5 and 6, only different sensor types (Oxi and Cond) may be connected at the same time.

7

Overview Multi 1970i

8

Multi 1970i Safety

2 Safety

This operating manual contains basic instructions that you must follow during the commissioning, operation and maintenance of the measuring instrument. Consequently, all responsible personnel must read this operating manual before working with the measuring system. The operating manual must always be available within the vicinity of the measuring system.

Target group The measuring instrument was developed for work in the field and in

the laboratory. Thus, we assume that, as a result of their professional training and experience, 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 manuals.

2.1 Authorized use

The authorized use of the measuring instrument consists exclusively of the:

z pH and ORP measurement

z measurement of the oxygen content and

z measurement of the conductivity, salinity and temperature

in the field and laboratory.

The technical specifications as given in chapter 7 T must be observed. Only the operation and running of the measuring instrument according to the instructions given in this operating manual is authorized. Any other use is considered to be unauthorized.

ECHNICAL DATA

9

Safety Multi 1970i

2.2 General safety instructions

This instrument is built and inspected according to the relevant guidelines and norms for electronic measuring instruments (see chapter 7T

ECHNICAL DATA).

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

Function and operating

safety

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

The smooth functioning and operational safety of the measuring instrument can only be guaranteed if the generally applicable safety measures and the specific safety instructions in this operating manual are followed during operation.

The smooth functioning and operational safety of the measuring instrument 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 functioning of the instrument. In this event, wait until the temperature of the instrument reaches room temperature before putting the instrument back into operation.

of service and secured against inadvertent operation! Safe operation is no longer possible if the measuring instrument:

z has been damaged in transport

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

time

Obligations of the pur-

chaser

z is visibly damaged

z no longer operates as described in this manual.

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

The purchaser of the measuring instrument must ensure that the following laws and guidelines are observed when using dangerous substances:

z EEC directives for protective labor legislation

z National protective labor legislation

z Safety regulations

z Safety datasheets of the chemical manufacturers.

10

Multi 1970i Commissioning

3 Commissioning

3.1 Scope of delivery

z Multi 1970i portable multiparameter measuring instrument with inte-

grated rechargeable battery

z Carrying and positioning handle

z Carrying strap

z 2 sensor quivers (pH and Oxi-LF type)

z Plug-in power supply unit

z Operating manual

3.2 Power supply

Mains operation and

charging the battery

Charging time of the

battery

You can either operate the measuring instrument with the integrated rechargeable battery or with the plug-in power supply. The plug-in power supply supplies the measuring instrument with low voltage (12 V DC). At the same time, the rechargeable battery is charged.

approx. 16 hours. The battery is charged even when the instrument is switched off. The LoBat display indicator appears when the battery is nearly empty and has to be charged as soon as possible.

Warning

The line voltage at the operating site must lie within the input voltage range of the original plug-in power supply (see chapter 7 T

TA).

ECHNICAL DA-

Warning

Use original plug-in power supplies only (see chapter 7 T

ECHNICAL DATA).

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Commissioning Multi 1970i

Connecting the plug-in

power supply unit

2

1

3

Setting the date and

time

1 Connect the plug (1) to the socket (2) of the measuring instru-

ment.

2 Connect the original WTW plug-in power supply (3) to an easily

accessible mains socket.

3.3 Initial commissioning

Perform the following activities:

z For mains operation and charging the battery: Connect the plug-in

power supply (see section 3.2 P

z Set the date and time.

1 Press the <M> key and hold it down.

2 Press the <ON/OFF> key.

The display test appears briefly on the display.

3 Press the <RUN/ENTER> key repeatedly until the date flashes

on the display (Day.Month display indicator).

OWER SUPPLY).

12

Multi 1970i Commissioning

m

%

1/

°

mg/l

S/

cm

%

C

REL1

AR

pH/mV

cm

Sal

K

/

REL2

TP

RCL

pH

O

Sal

Time

Day.Month

Year

LoBat

S

I

Baud

No.

Ident

0 9 0 4

Tref25

Tref20

nLF

Lin

5t2

Auto

Store

Cal

Oxi

TEC

ARng

4 Set the date of the current day with <▲> <▼>.

5 Confirm with <RUN/ENTER>.

The date (month) flashes in the display.

6 Set the current month with <▲> <▼>.

7 Confirm with <RUN/ENTER>.

The year appears on the display.

8 Set the current year with <▲> <▼>.

9 Confirm with <RUN/ENTER>.

The hours flash on the display.

10 Set the current time with <▲> <▼>.

11 Confirm with <RUN/ENTER>.

The minutes flash on the display.

12 Set the current time with <▲> <▼>.

13 Confirm with <RUN/ENTER>.

The instrument switches to the measuring mode.

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Commissioning Multi 1970i

3.4 Sensor quiver

To store the sensors during field operation and to keep the sensor element moist, the quiver tip contains a sponge rubber insert that can be moistened with deionized water.

Note

For further details on proper storage, refer to the operating manual of the sensor.

Moistening the

quiver insert

1 Press the quiver out of the holder from the back side of the in-

strument and pull it out completely.

2 Pull off the quiver tip and moisten the sponge rubber with

deionized water.

Warning

Do not store pH electrodes in the quiver for more than 10 hours. To store them for a longer period of time, use the watering cap filled with potassium chloride (3 mol/l) of the electrode.

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Multi 1970i Operation

4 Operation

4.1 Operating structure

Active and inactive REL

socket

In addition to the pH/ORP sensor, the sensor on the REL1 or REL2 socket can be actuated (switched "active"). The other socket is not actuated ("inactive"). This switching over inside the instrument is made with the aid of a relay. The active REL socket is shown on the display.

The measured variable on the display can be selected as follows using the <M> key:

z Press <M> shortly

z Press <M> for a longer

period of time:

Several measuring modes are available within a measured variable. Switch over between the measured variables with the <▲> or <▼> key.

The options are summarized in the following diagram:

: Switch between the pH/ORP sensor and

the sensor at the active REL socket

Change the active Rel socket

15

Operation Multi 1970i

Note

When a sensor is connected to the active REL socket, the measuring instrument recognizes the sensor or the measuring cell and automatically switches to the measuring mode that was last active. As soon as the sensor is disconnected from the active REL socket, the instrument switches to the pH (mV) measuring mode again.

4.2 Switching on the measuring instrument

1 Press the <ON/OFF> key.

The display test appears briefly on the display. After this, the measuring instrument automatically switches to the measuring mode.

Measuring mode when

switching on

Sensors on the socket Measuring mode

pH REL

(active)

REL

(inactive)

:

pH or ORP measurement - depending on the last selected setting

:

::

:

::

:::

Note

The measuring instrument has an energy saving feature to avoid unnecessary battery depletion. The energy saving feature switches the measuring instrument off if no key has been pressed for an hour.

Last selected measuring mode. Only the last active REL socket is taken into account

16

The energy saving feature is not active

z if the power is supplied by the plug-in power supply,

z if the AutoStore function is active,

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

program are connected,

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

Multi 1970i Operation

4.3 pH value / ORP voltage

4.3.1 General information

Preparatory activities Perform the following preparatory activities when you want to measure:

1 Connect the pH depth armature or the pH electrode to the mea-

suring instrument. If necessary, press the <M> key repeatedly until the pH (pH measurement) or U (measurement of the ORP voltage) display appears.

2 Adjust the temperature of the buffer solutions or test solutions,

or measure the current temperature, if you measure without a temperature sensor.

3 Calibrate or check the measuring instrument with the elec-

trode.

4 Using <▲ > <▼>, toggle between the pH or mV measuring

modes.

Note

Incorrect calibration of pH electrodes leads to incorrect measured values. Calibrate regularly before measuring. You can only connect electrodes of the NTC30 type or without temperature sensor.

Warning

When connecting an earthed PC/printer, measurements cannot be performed in earthed media as incorrect values would result. The RS232 interface is not galvanically isolated.

17

Operation Multi 1970i

Temperature measure-

ment in pH measure-

ments

You can perform pH measurements with or without a temperature sensor as well as with the temperature sensor of an oxygen sensor or a conductivity measuring cell. The measuring instrument recognizes which sensors are connected and switches automatically to the correct mode for the temperature measurement.

The following cases are distinguishable.

Temperature sensor Display Mode

pH Cond or

Oxi

yes - TP Automatic with

pH temperature sensor

yes yes TP

- - Manual

-yesTP flashes

The temperature value of the second sensor (Cond or Oxi) in the same sample is taken over for the pH measurement*

* If you do not wish that, you can:

– either disconnect the 2nd sensor and use the manual temperature

input or

– use an electrode with a temperature sensor.

If a temperature sensor is connected, it is indicated on the display by TP.

Note

When calibrating without a temperature sensor (no TP display indicator displayed), enter the current temperature of the respective buffer solution manually using the <▲> <▼> keys while keeping the <RUN/EN-

TER> key depressed.

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Multi 1970i Operation

4.3.2 Measuring the pH value

1 Perform the preparatory activities according to section 4.3.1.

2 Immerse the pH electrode in the test sample.

3 Press the <▲> <▼> keys repeatedly until pH appears on the

status display. The pH value appears on the display.

AutoRead AR

(Drift control) and hold

function

m

%

1/

°

mg/l

S/

cm

%

C

REL1

AR

pH/mV

Sal

TP

K

/

REL2

RCL

pH

S

O

Sal

Time

Day.Month

Year

LoBat nLF

4 When measuring without a connected temperature sensor:

The AutoRead function (drift control) checks the stability of the measurement signal. The stability has a considerable impact on the reproducibility of the measured values. With the aid of the hold function the measured value display is frozen.

6

1

Baud

No.

Ident

Tref25 Tref20

Options:

z Determine the current temperature using a thermometer

z TP display indicator not displayed, socket for the second

99

8

2 4 8

Auto

Store

Lin

Oxi

Cal

TEC

ARng

and, while keeping the <RUN/ENTER> key depressed, enter this temperature value with <▲> <▼>.

sensor is free: Connect the second sensor (Oxi or Cond) and immerse it in the same sample. TP flashes, the temperature is automatically measured using the second sensor.

With identical measurement conditions, the following criterion is valid for the AutoRead function:

Reproducibility Response time

Better than 0.02 > 30 seconds

For D. O. measurements, use the AutoRead function and hold function like this:

1 Call up the pH measuring mode with <▲> <▼>.

19

Operation Multi 1970i

2 Activate the AutoRead function with <AUTO READ>.

The current measured value is frozen (hold function).

3 Start AutoRead with <RUN/ENTER>.

AR flashes until a stable measured value is reached. This measured value is transmitted to the interface.

4 If necessary, start the next AutoRead measurement with

<RUN/ENTER>.

5 To terminate the AutoRead function: Press the

<AUTO READ> key.

Note

The current AutoRead measurement can be terminated at any time (accepting the current value) by pressing <RUN/ENTER>.

4.3.3 Measuring the ORP voltage

In conjunction with an ORP electrode, e.g. SenTix ORP, the measuring instrument can measure the ORP voltage (U) of a solution.

1 Perform the preparatory activities according to section 4.3.1.

2 Submerse the ORP electrode in the sample.

3 Press the <▲> <▼> key until the U status display appears. The

ORP voltage (mV) of the test sample appears on the display.

4 Wait for a stable measured value.

pH/

Store

TEC

ARng

mV

%

m

1/

°

mg/l

S/

cm

%

C

REL1

AR

cm

K

/

REL2

Sal

TP

RCL

pH

S

O

Sal

Time

Day.Month

Year

LoBat nLF

Note

ORP electrodes are not calibrated. However, you can check ORP electrodes using a test solution.

1

Baud

Ident

Tref25

No.

6

8

Tref20

Lin

Oxi

23

2 4 8

Auto

Cal

20

Multi 1970i Operation

4.3.4 pH calibration

Why calibrate? pH electrodes age. This changes the asymmetry (zero point) and slope

of the pH electrode. As a result, an inexact measured value is displayed. Calibration determines the current values of the asymmetry and slope of the electrode and stores them in the measuring instrument. Thus, you should calibrate at regular intervals.

When to calibrate? z After connecting another electrode

z When the sensor symbol flashes, i.e. after the calibration interval

has expired

Calibration points Calibration can be made with one or two buffer solutions (single-point

or two-point calibration). The measuring instrument determines the following values and calculates the calibration lines as follows:

Determined values Values of the calibration lines

1-point ASY z Asymmetry = ASY

z Slope = Nernst slope (59.16 mV/

pH at 25 °C)

2-point ASY

SLO

z Asymmetry = ASY

z Slope = SLO

AutoCal TEC is specially matched to the WTW technical buffer solutions as a fully au-

tomatic two-point calibration. The buffer solutions are automatically recognized by the measuring instrument. Depending on the instrument setting (see section 4.9 C

ONFIGURATION), the instrument displays the

relevant buffer nominal value or the current electrode voltage in mV. The calibration can be terminated after the first buffer solution. This corresponds to a single-point calibration. To do this, the instrument uses the Nernst slope (-59.2 mV/pH at 25 °C) and determines the asymmetry of the electrode.

AutoRead The calibration procedure automatically activates the AutoRead func-

tion. The current AutoRead measurement can be terminated at any time (accepting the current value) by pressing <RUN/ENTER>.

Displaying the calibra-

tion data

Printing the

calibration protocol

You can view the data of the last calibration on the display. The proceeding is described on page 50.

The calibration protocol contains the calibration data of the current calibration. You can transmit the calibration protocol to a printer via the serial interface (see O

INTERFACE, page 53).

UTPUTTING THE CALIBRATION PROTOCOL ON THE

21

Operation Multi 1970i

Note

You can automatically print a calibration protocol after the calibration. To do so, connect a printer to the interface according to section 4.8.2 before calibrating. After a valid calibration, the record is printed.

Sample printout:

CALIBRATION PROTOCOL

02.03.02 14:19 Device No.: 12345678 Calibration pH Cal time: 01.03.01 / 15:20 Cal interval: 7d AutoCal TEC Tauto Buffer 1 2.00 Buffer 2 4.01 Buffer 3 7.00 * Buffer 4 10.01 C1 184.1 mV 25.0°C C2 3.0 mV 25.0°C S1 -59.4 mV/pH ASY1 - 4 mV Probe: +++

22

Multi 1970i Operation

Calibration evaluation After calibrating, the measuring instrument automatically evaluates the

calibration. The asymmetry and slope are evaluated separately. The worst evaluation appears on the display.

Display Asymmetry

[mV]

-15 ... +15 -60.5 ... -58

-20 ... +20 -58 ... -57

-25 ... +25 -61 ... -60.5

-30 ... +30 -62 ... -61

Clean the electrode according to the electrode operating manual

Slope [mV/pH]

or

-57 ... -56

or

-56 ... -50

Preparatory activities

E3

Perform error elimination according to chapter 6 W

DO IF...

HAT TO

< -30 or > 30

< -62 or > -50

1 Connect the pH electrode to the measuring instrument.

If necessary, press the <M> key repeatedly until the status display pH (pH measurement) or U (measurement of the ORP voltage) appears.

2 Keep the buffer solutions ready.

3 Adjust the temperature of the solution and measure the current

temperature if the measurement is made without the use of a temperature sensor (the TP display indicator is missing from the display).

23

Operation Multi 1970i

AutoCal TEC For this procedure, use any two WTW technical buffer solutions (pH

values at 25 °C: 2.00 / 4.01 / 7.00 / 10.01).

Note

The calibration for pH 10.01 is optimized for the WTW technical buffer solution TEP 10 Trace or TPL 10 Trace. Other buffer solutions can lead to an erroneous calibration. The correct buffer solutions are given in the WTW catalog or in the Internet.

Note

The buffer solutions are automatically recognized by the measuring instrument. Depending on the instrument setting (see section 4.9 C er nominal value or the current electrode voltage in mV.

Note

Skip the steps 2 and 7 if you use a pH electrode with temperature sensor or the temperature sensor of a conductivity measuring cell or a D. O. sensor.

ONFIGURATION), the instrument displays the relevant buff-

Starting the calibration

1 Press the <CAL> key. The Ct1 display and the function display

AutoCal TEC appears. The sensor symbol displays the evalu-

ation of the last calibration (or no sensor symbol in the delivery state or after the measurement parameters have been reset).

m

%

1/

°

mg/l

S/

cm

%

C

REL1

AR

pH/mV

cm

K

/

Sal

TP

REL2

RCL

pH

S

O

Sal

Time

Day.Month

Year

LoBat nLF

2 If required, enter the temperature of the first buffer solution with

3 Immerse the pH electrode in the first buffer solution.

4 Press the <RUN/ENTER> key.

C

Lin

8

Oxi

T1

2 4 8

Store

Auto

TEC

ARng

Cal

1

Baud

No.

Ident

Tref25 Tref20

<▲> <▼> while keeping the <RUN/ENTER> key depressed.

The AR display indicator flashes. The electrode voltage (mV) or the buffer nominal value appears on the display. Example:

24

Multi 1970i Operation

mVS/

m

%

1/

°

mg/l

S/

cm

%

C

REL1

AR

pH

cm

K

/

REL2

Sal

TP

RCL

/

pH

3

TEC

ARng

mV

%

m

1/

°

mg/l

S/

cm

%

C

REL1

AR

cm

/

pH

S

O

Sal

Time

Day.Month

Year

LoBat nLF

5 When the measured value is stable, Ct2 appears.

1

Baud

No.

Ident

Tref25 Tref20

Lin

69

8

2 4 8

Auto

Oxi

Cal

K

Sal

TP

REL2

RCL

pH

O

Sal

1

Time

Day.Month

Year

LoBat nLF

700

Baud

No.

Ident

8

Lin

Oxi

2 4 8

Auto

Cal

Tref25 Tref20

TEC

ARng

m

%

1/

°

mg/l

S/

cm

%

C

REL1

AR

pH/mV

cm

Sal

K

/

REL2

TP

RCL

pH

S

O

Sal

Time

Day.Month

Year

LoBat nLF

Note

At this point, the AutoCal TEC calibration can be terminated with <M>. This corresponds to a single-point calibration. To do this, the instru- ment uses the Nernst slope (-59.2 mV/pH at 25 °C) and determines the asymmetry of the electrode.

6 Thoroughly rinse the electrode with distilled water.

7 If required, enter the temperature of the second buffer solution

8 Immerse the pH electrode into the second buffer solution.

9 Press the <RUN/ENTER> key.

C

Lin

8

Oxi

T2

2 4 8

Store

Auto

TEC

ARng

Cal

1

Baud

No.

Ident

Tref25 Tref20

with <▲> <▼> while keeping the <RUN/ENTER> key depressed.

The AR display indicator flashes. The electrode voltage (mV) or the buffer nominal value appears on the display. Example:

25

Operation Multi 1970i

mVS/

m

%

1/

°

mg/l

S/

cm

%

C

REL1

AR

pH

cm

K

/

REL2

Sal

TP

RCL

pH

O

Sal

1

Time

Day.Month

Year

LoBat nLF

S

Baud

No.

Ident

Tref25 Tref20

Lin

8

2 4 8

Auto

Oxi

Cal

TEC

ARng

mV

%

m

1/

°

/

mg/l

S/

cm

%

C

REL1

AR

pH

cm

K

/

REL2

Sal

TP

RCL

pH

O

Sal

1

Time

Day.Month

Year

LoBat nLF

401184

Baud

No.

Ident

8

Tref25 Tref20

Lin

Oxi

2 4 8

Auto

TEC

ARng

Cal

10 When the measured value is stable, AR disappears. The value

of the slope (mV/pH) appears on the display. The sensor symbol shows the evaluation of the current calibration.

%

m

1/

°

S/

C

pH/mV

mg/l

cm

%

/

REL1

AR

K

Sal

TP

REL2

RCL

pH

S

O

Sal

1

Time

Day.Month

Year

LoBat nLF

594

Baud

No.

Ident

Tref25 Tref20

Lin

8

Oxi

2 4 8

Auto

Cal

Store

TEC

ARng

11 Press the <RUN/ENTER> key. The value of the asymmetry

(mV) appears on the display.

pH/

2

Store

TEC

ARng

mV

%

m

1/

°

mg/l

S/

cm

%

C

REL1

AR

cm

K

/

REL2

Sal

TP

RCL

pH

S

O

Sal

1

Time

Day.Month

Year

LoBat nLF

59

Baud

No.

Ident

8

Tref25 Tref20

Lin

2 4 8

Auto

Oxi

Cal

12 Switch to the measuring mode with <M>.

26

Multi 1970i Operation

4.4 Dissolved oxygen

4.4.1 General information

Note

D. O. measurements with the Multi 1970i can only be carried out using a CellOx 325 or StirrOx G D. O. sensor. The stirrer of the StirrOx G D. O. sensor has to be supplied with voltage separately using the NT/pH Mix 540 power supply.

You can measure the following variables:

z D. O. concentration

z Oxygen saturation

The measuring instrument is supplied with the following functions:

z AutoRange (automatic switchover of the measurement range). If a

measuring range is exceeded, AutoRange causes the measuring instrument to change automatically to the next higher measuring range and back again. Therefore, the instrument always measures in the measuring range with the highest possible resolution.

z The AutoRead function (drift control) for checking the stability of the

measurement signal. This ensures the reproducibility of the measuring signal. For details of how to switch the AutoRead function on/off, see page 31.

Warning

When connecting an earthed PC/printer, measurements cannot be performed in earthed media as incorrect values would result. The RS232 interface is not galvanically isolated.

Preparatory activities Perform the following preparatory activities when you want to measure:

1 Connect the D. O. sensor to the measuring instrument. If the D.

O. sensor is connected to the active REL socket, press the <M> repeatedly if necessary until the O

status display indica-

2

tor appears. If the D. O. sensor is connected to the inactive REL socket, press the <M> key for 2 s, until the O

status dis-

2

play indicator appears.

2 Calibrate or check the measuring instrument with the sensor.

How to calibrate is described in section 4.4.5 from page 21.

3 Use <▲> <▼> to toggle between the measuring modes, D. O.

concentration (mg/L) and D. O. saturation (%).

27

Operation Multi 1970i

Note

Incorrect calibration of D. O. probes will result in incorrect measured values. Calibrate at regular intervals.

Temperature sensor The D. O. sensor has an integrated temperature sensor that always

measures the current temperature of the test sample.

28

Multi 1970i Operation

4.4.2 Measuring the D. O. concentration

When measuring the concentration of test samples with a salt content of more than 1 g/l, a salinity correction is required.

Note

How to enter the current salt content is described in section 4.4.6 E Switching the salt content correction on or off, see below.

To measure the D. O. concentration with and without salt content correction, proceed as follows:

1 Perform the preparatory activities according to section 4.4.1.

2 Immerse the D. O. sensor in the test sample.

3 Press the <▲> <▼> key repeatedly until the D. O. concentra-

tion in mg/l appears on the display.

NTERING THE SALT CONTENT (SALINITY) on page 35.

Switching on/off the salt

content correction

m

%

1/

°

mg/l

S/

cm

%

C

REL1

AR

pH/mV

cm

Sal

K

/

REL2

TP

RCL

pH

S

O

Sal

Time

Day.Month

Year

LoBat nLF

Proceed as follows to switch on the salt content correction:

1 Perform the preparatory activities according to section 4.4.1.

2 Immerse the D. O. sensor in the test sample.

3 While pressing the <RUN/ENTER> key, switch on the salt con-

7

Lin

8

Oxi

92

1 7 6

Auto

Store

Cal

TEC

ARng

1

Baud

No.

Ident

Tref25 Tref20

tent correction with <▲> . The SAL display indicator appears on the display. The specified salt content is taken into consideration during the measurement.

29

Operation Multi 1970i

%

m

1/

°

S/

C

pH/mV

mg/l

cm

%

/

REL1

AR

K

Sal

TP

REL2

RCL

pH

S

O

Sal

Time

Day.Month

Year

LoBat nLF

4 While pressing the <RUN/ENTER> key, switch off the salt con-

4.4.3 Measuring the D. O. saturation

You can measure the D. O. saturation as follows:

1 Perform the preparatory activities according to section 4.4.1.

2 Immerse the D. O. sensor in the test sample.

5

Lin

8

Oxi

42

1 7 6

Auto

Store

Cal

TEC

ARng

1

Baud

No.

Ident

Tref25 Tref20

tent correction with <▼>. The SAL display indicator is no longer displayed.

3 Press the <▲> <▼> key repeatedly until the D. O. saturation in

% appears on the display.

/mV

%

m

1/

°

S/

C

pH

mg/l

cm

%

/

REL1

AR

K

Sal

TP

REL2

RCL

pH

S

O

Sal

1

Time

Day.Month

Year

LoBat nLF

8

Baud

No.

Ident

8

Tref25 Tref20

Lin

92

1 7 6

Auto

Oxi

Cal

Store

TEC

ARng

30

Multi 1970i Operation

4.4.4 AutoRead AR (Drift control) and hold function

The AutoRead function (drift control) checks the stability of the measurement signal. The stability has a considerable impact on the reproducibility of the measured values. With the aid of the hold function the measured value display is frozen.

Criteria With identical measurement conditions, the following criteria are valid

for the AutoRead function:

Measuring mode Reproducibility Response time

D. O. concentration

Oxygen saturation index

For D. O. measurements, use the AutoRead function and hold function like this:

1 Call up the measuring mode with <M> and/or <▲> <▼> .

2 Activate the AutoRead function with <AUTO READ>. The cur-

rent measured value is frozen (hold function).

3 Start AutoRead with <RUN/ENTER>.

AR flashes until a stable measured value is reached. This measured value is transmitted to the interface.

pH

S

O

Sal

Time

Day.Month

Year

LoBat nLF

1

Baud

No.

Ident

Tref25 Tref20

Lin

7

8

1 7 6

Oxi

08

Auto

better than 0.05 mg/l > 10 seconds

better than 0.6 % > 10 seconds

pH/mV

mg/l

%

m

S/

cm

1/

cm

Sal

TP

K

%

°

/

ARng

C

REL1

AR

REL2

RCL

Store

Cal

TEC

4 If necessary, start the next AutoRead measurement with

<RUN/ENTER>.

5 To terminate the AutoRead function: Press the

<AUTO READ> key.

31

Operation Multi 1970i

4.4.5 D. O. calibration

Why calibrate? D. O. probes age. This changes the slope of the D. O. sensor. Calibra-

tion determines the current slope of the sensor and stores this value in the instrument.

When to calibrate? z After connecting another D. O. sensor

z When the sensor symbol flashes (after the calibration interval has

expired).

Calibration procedure The calibration is performed in water vapor-saturated air. Use the

®

OxiCal

-SL air calibration vessel (accessory) for the calibration.

AutoRead The calibration procedure automatically activates the AutoRead func-

tion. The AR display indicator flashes. The calibration process is finished when AR stops flashing.

Displaying the calibra-

tion data

Printing the

calibration protocol

You can view the data of the last calibration on the display. The proceeding is described on page 50.

The calibration protocol contains the calibration data of the current calibration. You can transmit the calibration protocol to a printer via the serial interface (see page 53).

Note

You can automatically print a calibration protocol after the calibration. To do so, connect a printer to the interface according to section 4.8.2 before calibrating. After a valid calibration, the record is printed.

Sample printout:

CALIBRATION PROTOCOL

02.03.02 14:19 Device No.: 12345678 CALIBRATION 02 Cal time: 02.03.01 / 14:19 Cal interval: 14d OxiCal Tauto AR Relative Slope: 0,88 Probe: +++

32

Multi 1970i Operation

Sensor evaluation After the calibration, the measuring instrument evaluates the current

status of the sensor against the relative slope. The evaluation appears on the display. The relative slope has no effect on the measuring accuracy. Low values indicate that the electrolyte will soon be depleted and the sensor will have to be regenerated.

Display Relative slope

S = 0.8 ... 1.25

S = 0.7 ... 0.8

S = 0.6 ... 0.7

E3

S < 0.6 or S > 1.25

Perform error elimination according to chapter 6 W

HAT TO DO IF...

Starting the calibration Proceed as follows to calibrate the instrument:

1 Perform the preparatory activities according to section 4.4.1.

®

2 Keep the OxiCal

-SL air calibration vessel ready.

Note

The sponge in the air calibration vessel must be moist (not wet). Observe the instructions in the OxiCal

®

-SL operating manual.

3 Put the D. O. sensor into the air calibration vessel.

4 Press the <CAL> key repeatedly until the calibration mode ap-

pears. The sensor symbol displays the evaluation of the last calibration (or no sensor symbol in the delivery state or after the measuring parameters have been reset).

33

Operation Multi 1970i

m

%

1/

°

%

1/

°

mg/l

S/

cm

%

C

REL1

AR

mg/l

S/

cm

%

C

REL1

AR

pH/mV

cm

K

/

REL2

pH/mV

cm

K

/

REL2

Sal

TP

RCL

Sal

TP

RCL

pH

S

O

Sal

Time Baud

Day.Month

Year

LoBat

5 Press the <RUN/ENTER> key. AutoRead is active, AR flashes.

pH

1

No.

Ident

Tref25 Tref20

Lin

nLF

S

C

8

1 7 6

Oxi

AL

Auto

Store

ARng

TEC

Cal

O

Sal

Time Baud

Day.Month

Year

LoBat

6 As soon as a stable value is achieved the AR display stops

0

Lin

8

Oxi

88

1 7 6

Auto

Store

ARng

TEC

Cal

1

No.

Ident

Tref25 Tref20

nLF

flashing. The calibration is finished then. The value of the relative slope appears on the display. The sensor symbol shows the sensor evaluation (see page 33).

%

m

1/

°

S/

C

pH/mV

mg/l

cm

%

/

REL1

AR

K

Sal

TP

REL2

RCL

pH

S

O

Sal

Time Baud

Day.Month

Year

LoBat

7 Switch to the measuring mode with <M>.

Note

In chapter 6 W to take for error elimination.

1

No.

Ident

Tref25 Tref20

Lin

nLF

0

88

8

1 7 6

Auto

Store

ARng

Oxi

TEC

Cal

HAT TO DO IF... from page 67, you will find the measures

34

Multi 1970i Operation

4.4.6 Entering the salt content (salinity)

A salt content correction is required in the oxygen concentration measurement of samples with a salt content of more than 1 g/l. To do this, you have to enter the salinity equivalent (the measured salinity) of the test sample (range 0.0 - 70.0) and to switch on the salinity correction.

Note

With the Multi 1970i, you can measure the salinity. How to proceed is described in section 4.5.3 M

EASURING THE SALINITY on page 38.

Entering the

salt content

1 Determine the salinity of the test sample (any method, see also

section 4.5.3 M

2 Press the <CAL> key repeatedly until Sal appears on the dis-

play.

pH

S

O

Sal

Time Baud

Day.Month

Year

LoBat

3 Enter the salt content with <▲> <▼>.

4 Switch to the measuring mode with <M>.

Note

How to switch on the salt content correction is described on page 29.

1

No.

Ident

Tref25 Tref20

Lin

nLF

5

8

6 9 6

Oxi

50

Auto

Cal

EASURING THE SALINITY on page 38).

pH/mV

mg/l

%

m

S/

cm

1/

cm

Sal

TP

K

%

°

/

ARng

C

REL1

AR

REL2

RCL

Store

TEC

35

Operation Multi 1970i

4.5 Conductivity

4.5.1 General information

Note

Conductivity measurements with the Multi 1970i can only be carried out using the TetraCon 325 measuring cell.

Warning

When connecting an earthed PC/printer, measurements cannot be performed in earthed media as incorrect values would result. The RS232 interface is not galvanically isolated.

The measuring instrument is supplied with the following functions:

z AutoRange (automatic switchover of the measurement range). If a

measuring range is exceeded, AutoRange causes the measuring instrument to change automatically to the next higher measuring range and back again. Therefore, the instrument always measures in the measuring range with the highest possible resolution.

z The AutoRead function (drift control) for checking the stability of the

measurement signal. This ensures the reproducibility of the measuring signal. For details of how to switch the AutoRead function on/off, see page 39.

Preparatory activities Perform the following preparatory activities when you want to measure:

1 Connect a conductivity measuring cell to the measuring instru-

ment. If the conductivity measuring cell is connected to the active REL socket, press the <M> key repeatedly (if necessary) until the status display appears. If the conductivity measuring cell is connected to the inactive REL socket, press the <M> key for 2 s until the status display appears.

2 Check the selected cell constant or calibrate the measuring in-

strument with the measuring cell (see below).

3 Check the selected cell constant (see below) or calibrate the

measuring instrument with the measuring cell (see section 4.5.5 on page 40).

4Using <▲ > <▼>, toggle between the measuring modes, con-

ductivity ( in µS/cm) or salinity (SAL).

Temperature sensor The TetraCon 325 conductivity measuring cell has a temperature sen-

sor integrated in it. The temperature sensor is shown on the display by TP.

36

Multi 1970i Operation

Temperature

compensation

Reference temperature,

Tref

Checking the

cell constant

The nonlinear temperature compensation is set fixed and is shown on the display by nLF.

The reference temperature (Tref) can be switched between 20 °C and 25 °C. It appears on the display as Tref20 or Tref25. To switch over the reference temperature, see S

TURE, page 60.

1 Press the <RCL> key repeatedly until CAL disp appears on the

display.

pH

S

O

Sal

Time Baud

Day.Month

Year

LoBat

C

No.

Ident

Tref25 Tref20

Lin

nLF

C

I S P

d

Oxi

AL

Auto

Store

TEC

ARng

Cal

WITCHING OVER THE REFERENCE TEMPERA-

pH/mV

mg/l

%

m

S/

cm

1/

cm

Sal

TP

K

%

°

/

C

REL2

REL1

AR

RCL

2 Press the <RUN/ENTER> repeatedly until the last calibrated

cell constant is displayed, e. g. 0.472 1/cm.

pH

S

O

Sal

C

Time Baud

Day.Month

LoBat

No.

Year

Ident

0

Tref20

Tref25

Oxi

Lin

nLF

3 To return to the measuring mode: Press the <M> key when the

correct cell constant is displayed.

4 If you want to recalibrate the cell constant, proceed according

to section 4.5.5 D

IN THE CONTROL STANDARD) .

LC

C

4 7 5

Auto

Store

ARng

TEC

Cal

pH/mV

mg/l

%

m

S/

cm

1/

cm

Sal

TP

K

%

°

/

C

REL1

REL2

AR

RCL

ETERMINING THE CELL CONSTANT (CALIBRATION

37

Operation Multi 1970i

4.5.2 Measuring the conductivity

You can carry out the conductivity measurements as follows:

1 Perform the preparatory activities according to section 4.5.1

page 36.

2 Immerse the conductivity measuring cell in the test sample.

3 Press the < ▲> <▼> keys until in the status display, and the

unit µS/cm appears. The conductivity value appears on the display.

%

m

1/

°

S/

C

pH/mV

mg/l

cm

%

/

REL1

AR

K

Sal

TP

REL2

RCL

pH

S

O

Sal

C

Time Baud

Day.Month

Year

LoBat

Ident

Tref25

nLF

05 3

No.

0

2 4 0

Tref20

Auto

Store

Cal

Oxi

Lin

TEC

ARng

4.5.3 Measuring the salinity

You can carry out the salinity measurements as follows:

1 Perform the preparatory activities according to section 4.5.1

page 36.

2 Immerse the conductivity measuring cell in the test sample.

3 Press the <▲> <▼> keys repeatedly until the Sal status display

appears. The salinity value appears on the display.

%

m

1/

°

S/

C

pH/mV

mg/l

cm

%

/

REL1

AR

K

Sal

TP

REL2

RCL

pH

S

O

Sal

C

Time Baud

Day.Month

Year

LoBat

Ident

Tref25

nLF

332

No.

0

2 1 2

Tref20

Auto

Store

TEC

ARng

Cal

Oxi

Lin

38

Multi 1970i Operation

4.5.4 AutoRead AR (Drift control) and hold function

The AutoRead function (drift control) checks the stability of the measurement signal. The stability has a considerable impact on the reproducibility of the measured values. With the aid of the hold function the measured value display is frozen.

For conductivity measurements, use the AutoRead function and hold function like this:

1 Call up the measuring mode or SAL with <M> and/or <▲ >

<▼>.

2 Immerse the conductivity measuring cell in the test sample.

3 Activate the AutoRead function with <AUTO READ>. The cur-

rent measured value is frozen (hold function).

4 Start AutoRead with <RUN/ENTER>.

AR flashes until a stable measured value is reached. This measured value is transmitted to the interface.

m

%

1/

°

mg/l

S/

cm

%

C

REL1

pH/mV

cm

Sal

K

/

REL2

RCL

pH

S

O

Sal

C

Time Baud

Day.Month

Year

LoBat

Ident

Tref25

nLF

05 3

No.

0

2 5 0

Tref20

Auto

Store

Cal

Oxi

Lin

TEC

ARngTPAR

5 If necessary, start the next AutoRead measurement with

<RUN/ENTER>.

6 To terminate AutoRead: Press the <AUTO READ> key.

Note

The current AutoRead measurement can be terminated at any time (accepting the current value) by pressing <RUN/ENTER>. You can only change to another measuring mode after completion of AutoRead.

39

Operation Multi 1970i

4.5.5 Determining the cell constant (Calibration in the control standard)

Why determine the cell

constant?

AutoRead In calibration, the AutoRead function is automatically activated. The AR

Displaying the

calibration data

Printing the

calibration protocol

Aging slightly changes the cell constant, e. g. by coatings. As a result, an inexact measured value is displayed. The original characteristics of the cell can often be restored by cleaning the cell. Calibration determines the current value of the cell constant and stores this value in the instrument. Thus, you should calibrate at regular intervals.

In the delivery condition, the cell constant of the measuring instrument is set to 0.475 cm

-1

(conductivity measuring cell TetraCon 325).

display indicator flashes. The calibration process is finished when AR stops flashing.

You can view the data of the last calibration on the display. The proceeding is described on page 50.

The calibration protocol contains the calibration data of the current calibration. You can transmit the calibration protocol to a printer via the serial interface (see page 53).

Note

You can automatically print a calibration protocol after the calibration. To do so, connect a printer to the interface according to section 4.8.2 before calibrating. After a valid calibration, the record is printed.

Sample printout:

CALIBRATION PROTOCOL

14.04.02 11:37 Device No.: 99990000 Calibration Conductivity Cal time: 14.04.01 / 11:37 Cal interval: 180d Cal Std.: 0.01 mol/l KCL

40.0 °C Conduct./Tref25: 1413µS/cm Cell Const : 0.478 1/cm Probe : +++

40

Multi 1970i Operation

Calibration evaluation After the calibration, the measuring instrument automatically evaluates

the current status of the calibration. The evaluation appears on the display.

-1

Display Cell constant [cm

0.450 ... 0.500 cm

]

-1

Determining the

cell constant

E3

Perform error elimination according to chapter 6 W

IF...

HAT TO DO

Outside the range

0.450 ... 0.500 cm

-1

You can determine the cell constant (conductivity measuring cell TetraCon 325) as follows:

1 Press the <CAL> key repeatedly until the status display

CAL appears.

2 Press the <RUN/ENTER> key. The CAL display appears, as

well as – the current, calibrated cell constant (with sensor symbol on

the display) or

– the fixed cell constant 0.475 1/cm (without sensor symbol

on the display). In this case, the measurement parameters are initialized. See “Reset” on page 62..

/pH

pH

S

O

Sal

1

Time

Day.Month

Year

LoBat nLF

Baud

No.

Ident

0 4 7 2

Tref20

Tref25

Lin

Oxi

AC

Auto

Cal

L

TEC

ARng

mV

%

m

1/

°

mg/l

S/

cm

%

C

REL1

AR

pH

O

Sal

Time

Sal

REL2

RCL

Day.Month

Year

LoBat nLF

K

/

CAL

1

Baud

No.

Ident

0

Tref20

Tref25

Lin

Oxi

4 7 5

Auto

Cal

TEC

ARng

mVS/

%

m

1/

°

mg/l

S/

cm

%

C

REL1

AR

pH

cm

K

/

Sal

TPTP

REL2

RCL

3 Immerse the conductivity measuring cell in the control standard

solution, 0.01 mol/l KCI.

41

Operation Multi 1970i

4 Press the <RUN/ENTER> key.

The AutoRead measurement to determine the cell constant starts. The AR display indicator flashes until a stable signal is reached. The cell constant determined is displayed. The measuring instrument automatically stores the cell constant.

%

m

1/

°

S/

C

pH/mV

mg/l

cm

%

/

REL1

AR

K

Sal

TP

REL2

RCL

pH

S

O

Sal

C

Time Baud

Day.Month

Year

LoBat

Ident

Tref25

nLF

LCA

No.

4 7 3

0

Tref20

Auto

Store

Oxi

Lin

Cal

TEC

ARng

5 To return to the measuring mode: Press the <M> key. The de-

termined cell constant is taken over for the measurement.

Note

If error message

appears refer to chapter 6 W

E3

E3E3

HAT TO DO IF...

42

Multi 1970i Operation

4.6 Calibration intervals (Int 3, Int 4, Int 5)

For each measured variable, a time interval is stored. When it has expired, you will be reminded to calibrate. After a calibration interval has expired, the sensor symbol of the relevant measured variable flashes. It is still possible to measure. By calibrating the relevant sensor, the function is reset and the interval starts anew.

The following calibration intervals are set in the factory:

Setting the calibration

interval

Measured

Designation Default setting

parameter

pH/ORP Int 3 7 days

Dissolved

Int 4 14 days

oxygen

Conductivity Int 5 180 days

You can change each of these intervals (1 ... 999 days):

1 Switch off the measuring instrument.

2 Press the <M> key and hold it down.

3 Press the <ON/OFF> key.

The display test appears briefly on the display. After this, the measuring instrument automatically switches over to configuration.

4 Press the <RUN/ENTER> key repeatedly, until Int 3 ... 5 to-

gether with the required measured variable (pH, O

or ) ap-

2

pears. Example:

m

%

1/

°

mg/l

S/

cm

%

C

REL1

AR

pH/mV

cm

Sal

K

/

REL2

TP

RCL

pH

O

Sal

Time

Day.Month

Year

LoBat

S

I

Baud

Ident

Tref25

nLF

4nt

No.

4

1 4

Auto

Store

Oxi

Cal

TEC

ARng

Lin

d

Tref20

5 Set the required interval until the next calibration with <▲>

<▼>.

6 Confirm with <RUN/ENTER>.

7 Switch to the measuring mode with <M>.

43

Operation Multi 1970i

4.7 Saving data

The portable Multi 1970i multiparameter measuring instrument has an internal data storage. It can store up to 500 datasets. A complete data record consists of:

z Number of the storage location

z Date/time

z Measured values of the connected and active sensors

z Temperature values of the connected and active sensors

z Temperature measuring procedure

z ID number

You can transmit measured values (data records) to the data storage in two ways:

z Save manually

z Switch on AutoStore (Int 1), see page 46

4.7.1 Saving manually

You can transmit a measured value to the data storage as follows:

1 Press the <STO> key.

The current number (location number No.) of the next free storage location appears under the current measured value on the display.

%

m

1/

°

S/

C

pH/mV

mg/l

cm

%

/

REL1

AR

K

Sal

TP

REL2

RCL

pH

O

Sal

Time

Day.Month

Year

LoBat

S

I

Baud

Ident

Tref25

nLF

No.

d 1

4

Tref20

Oxi

Lin

Auto

Cal

Store

TEC

969

4

ARng

2 Confirm with <RUN/ENTER>.

The display switches to entering the ID number.

44

Multi 1970i Operation

Message StoFull

StoFull This message appears when all of the 500 storage locations are occu-

StoFullStoFull

m

%

1/

°

mg/l

S/

cm

%

C

REL1

AR

pH/mV

cm

Sal

K

/

REL2

TP

RCL

pH

O

Sal

Time

Day.Month

Year

LoBat

S

I

Baud

No.

Ident

Tref25

nLF

d 1

4

Tref20

Auto

Cal

Oxi

Lin

Store

TEC

969

2

ARng

3 Using <▲> <▼>, enter the required ID number

(1 ... 999).

4 Confirm with <RUN/ENTER>.

The measured values are stored. The instrument changes to the measuring mode.

pied.

You have the following options:

Saving the current measured value. The oldest measured value (storage location 1) will be overwritten by this

Press

Returning to the measuring mode without saving press any key

Outputting the data storage see

section 4.7.3

Clearing the memory see

section 4.7.4

45

Operation Multi 1970i

4.7.2 Switching on AutoStore (Int 1)

The save interval (Int 1) determines the chronological interval between automatic save processes. After the fixed interval has expired, the current data record is transmitted to the internal storage and to the interface.

Switching on AutoStore

1 Press the <RUN/ENTER> key and hold it down.

2 Press the <STO> key. Int 1 appears on the display.

%

m

1/

°

S/

C

pH/mV

mg/l

cm

%

/

REL1

AR

K

Sal

TP

REL2

RCL

pH

O

Sal

Time

Day.Month

Year

LoBat

S

I

Baud

Ident

Tref25

nLF

1nt

No.

Lin

d

Tref20

Auto

Cal

Oxi

F

FO

Store

ARng

TEC

3 Set the required interval between the saving procedures with

<▲> <▼> (selection: 5 s, 10 s, 30 s, 1 min, 5 min, 10 min, 15 min, 30 min, 60 min).

4 Confirm with <RUN/ENTER>.

The number of free memory locations appears on the display.

%

m

1/

°

S/

C

pH/mV

mg/l

cm

%

/

REL1

AR

K

Sal

TP

REL2

RCL

pH

O

Sal

Time

Day.Month

Year

LoBat

S

I

Baud

Ident

Tref25

nLF

949

No.

E

ER

Store

Auto

Cal

Oxi

TEC

ARng

Lin

F

Tref20

46

5 Confirm with <RUN/ENTER>.

The prompt for the ID number appears on the display.

Multi 1970i Operation

m

%

1/

°

mg/l

S/

cm

%

C

REL1

AR

pH/mV

cm

Sal

K

/

REL2

TP

RCL

pH

O

Sal

Time

Day.Month

Year

LoBat

S

I

Baud

Ident

Tref25

nLF

949

No.

ERF

Store

TEC

1

ARng

Lin

Tref20

Auto

Cal

Oxi

6 Set the required ID number with <▲> <▼>.

7 Confirm with <RUN/ENTER>.

The measuring instrument switches to the last active measuring mode and start the measuring and saving procedure. Au- toStore flashes on the display.

As soon as all of the 500 storage locations are occupied, AutoStore is terminated (Int 1 = OFF). If there are not enough storage locations available for your measurements:

z Output and backup the data storage (see page 48) and

z clear the memory (see page 54).

Note

The AutoStore function is interrupted if you start other functions, e.g. output the data storage. After the other function is finished, the AutoStore function is continued. By this, however, temporal gaps in the recording of the measured values will occur.

Switching off AutoStore Switch AutoStore off by:

z setting the save interval (Int 1) to OFF, or

z switching the measuring instrument off and then on again.

47

Operation Multi 1970i

4.7.3 Outputting the data storage

You can output the contents of the data storage:

z Stored data on the display

z Calibration data on the display

z Stored data on the serial interface

z Calibration protocol on the interface

Outputting stored data

on the display

1 Press the <RCL> key repeatedly until StO dISP appears on the

display.

%

m

1/

°

S/

C

pH/mV

mg/l

cm

%

/

REL1

AR

K

Sal

TP

REL2

RCL

pH

O

Sal

Time

Day.Month

Year

LoBat

S

I

Baud

Ident

Tref25

nLF

oST

No.

SID

P

Store

Auto

Tref20

Cal

Oxi

Lin

TEC

ARng

2 Press the <RUN/ENTER> key.

A measured value appears on the display. The storage location of the data record is displayed for approx. 2 s, then the respective temperature appears.

m

%

1/

°

mg/l

S/

cm

%

C

REL1

AR

pH/mV

cm

K

/

REL2

Sal

TP

RCL

pH

S

O

Sal

1

Time

Day.Month

Year

LoBat nLF

6

Baud

No.

Ident

8

Tref25 Tref20

Lin

03

2 5 0

Auto

Store

Oxi

Cal

TEC

ARng

48

You can perform the following activities:

Display further data of the data record

Press <RUN/ENTER>

(ID number, date, time, storage location)

Toggle between two saved measured variables

Press <RUN/EN-

TER> + <M>

Advance one data record (storage location) Press <▲>

Go back one data record (storage location) Press <▼>

Multi 1970i Operation

Note

If you want to search for a certain element of the data record (e.g. date), proceed as follows:

1 Using <RUN/ENTER>, select the element (e.g. date).

2 Press <▲> or <▼> repeatedly until the required element ap-

pears on the display. After approx. 2 s the temperature of the displayed measured value appears.

Outputting stored data

to the interface

1 Press the <RCL> key repeatedly until Sto SEr appears on the

display.

m

%

1/

°

mg/l

S/

cm

%

C

REL1

AR

pH/mV

cm

Sal

K

/

REL2

TP

RCL

pH

O

Sal

Time

Day.Month

Year

LoBat

S

I

Baud

Ident

Tref25

nLF

oST

No.

Lin

D

Tref20

ES

r

Store

Auto

Cal

Oxi

TEC

ARng

2 Press the <RUN/ENTER> key.

The complete contents of the storage are transmitted to the interface. During the data transmission the instrument increments the storage numbers. After the data transmission, the instrument automatically switches to the last active measurement mode.

The transmitted data contains the entire contents of the storage in incrementing order of the location numbers.

Note You can cancel the transmission with <M> or <RUN/ENTER>.

49

Operation Multi 1970i

Sample printout:

No. 1:

09.03.02 17:10 pH 10.01 25 °C Tauto AR Ident : 47

No. 2:

09.03.02 17:12 305 mV Tauto Ident : 6

No. 3:

09.03.02 17:24

7.88 mg/l 17.6° C Tauto Ident : 81

No. 4:

09.03.02 17:46

7.11 mg/l 17.8° C Tauto SAL = 17.9 Ident : 4

Outputting the calibra-

tion data

on the display

No. 5:

10.03.02 19:09

2.40 mS/cm 25.3 °C Tauto nLF Tref25 C = 0.475 1/cm Ident : 10

No. 6:

10.03.02 20:48

2.46 mS/cm 25.6 °C Tauto nLF Tref25 C = 0.475 1/cm Ident : 1

...

1 Press the <RCL> key repeatedly until CAL disp appears on

the display.

%

m

1/

°

S/

C

pH/mV

mg/l

cm

%

/

REL1

AR

K

Sal

TP

REL2

RCL

pH

S

O

Sal

C

Time Baud

Day.Month

Year

LoBat

C

No.

Ident

d

Tref25 Tref20

Lin

nLF

AL

I S P

Auto

Oxi

Cal

Store

TEC

ARng

50

Multi 1970i Operation

2 Press the <RUN/ENTER> key.

The data of the last calibration of all measured variables appears in the following sequence:

z pH: Slope SLO and asymmetry ASY

z Oxygen: Relative slope SLO

z Cond: Cell constant C

Information concerning the calibration procedure is output as well.

pH/

Store

TEC

ARng

mV

%

m

1/

°

mg/l

S/

cm

%

C

REL1

AR

cm

Sal

K

/

REL2

TP

RCL

pH

S

O

Sal

1

Time

Day.Month

Year

LoBat nLF

594

Baud

No.

Ident

8

Lin

Oxi

S L O

Auto

Cal

Tref25 Tref20

3 Press <RUN/ENTER> to display the value of the asymmetry

(mV).

pH/

Store

TEC

Store

TEC

ARng

0

ARng

mV

%

m

1/

°

mV

%

m

1/

°

mg/l

S/

cm

%

C

REL1

AR

mg/l

S/

cm

%

C

REL1

AR

cm

Sal

K

/

REL2

pH/

cm

Sal

K

/

REL2

TP

RCL

TP

RCL

pH

S

O

Sal

Time

Day.Month

Year

LoBat nLF

4 Press <RUN/ENTER> to display the relative slope of the D. O.

pH

1

Baud

No.

Ident

Tref25 Tref20

Lin

sensor.

S

5

8

A S Y

Oxi

01

Auto

Cal

O

Sal

1

Time

Day.Month

Year

Tref25 Tref20

LoBat nLF

Baud

No.

Ident

0

8

Lin

Oxi

88

S L

Auto

Cal

51

Operation Multi 1970i

5 Press <RUN/ENTER> to display the cell constant. The dis-

played value is: z the current, calibrated cell constant (with sensor symbol on

the display) or

z the fixed cell constant 0.475 1/cm (without sensor symbol

on the display). In this case, the measuring parameters are

pH

S

O

Sal

1

Time

Day.Month

Year

LoBat nLF

initialized (see section 4.10 R

/pH

mV

mg/l

%

m

S/

Baud

No.

Ident

0 4 7 2

Tref20

Tref25

Lin

Oxi

LCLC

C

Auto

ARng

TEC

Cal

1/

°

cm

%

C

AR

cm

/

Sal

K

REL2

RCL RCL

ESET).

pH

O

Sal

1

Time

Day.Month

Year

LoBat nLF

Baud

Ident

Tref25

mVS/

pH

mg/l

%

m

S/

ARng

1/

°

cm

%

C

REL1REL1

AR

cm

K

/

Sal

TPTP

REL2

C

No.

4 7 5

0

Auto

Tref20

Lin

Oxi

TEC

Cal

6 With <M> you can switch back to the last active measuring

mode.

52

Multi 1970i Operation

Outputting the calibra-

tion protocol on the

interface

1 Press the <RCL> key repeatedly until CAL SEr appears on the

display.

m

%

1/

°

mg/l

S/

cm

%

C

REL1

AR

pH/mV

cm

Sal

K

/

REL2

TP

RCL

pH

S

O

Sal

C

Time Baud

Day.Month

Year

LoBat

C

No.

Ident

d

Tref25 Tref20

Lin

nLF

AL

S E R

Auto

Oxi

Cal

Store

TEC

ARng

2 Press the <RUN/ENTER> key.

The calibration protocol for all measured variables is transmitted to the interface. After the data transmission, the instrument automatically switches to the last active measurement mode.

Sample printout:

CALIBRATION PROTOCOL

02.03.02 14:19 Device No.: 12345678

Calibration pH Cal time: 01.03.02 / 15:20 Cal interval: 7d AutoCal TEC Tauto Buffer 1 2.00 Buffer 2 4.01 Buffer 3 7.00 * Buffer 4 10.01 C1 174.1 mV 25.0°C C2 -133.3 mV 25.0°C S1 -59.4 mV/pH ASY1 - 4 mV Probe: +++

CALIBRATION 02 Cal time: 02.03.02 / 14:19 Cal interval: 14d OxiCal Tauto AR Relative Slope: 0,88 Probe: +++

Calibration Conductivity Cal time: 14.01.02 / 11:37 Cal interval: 180d Cal Std.: 0.01 mol/l KCL

40.0 °C Conduct./Tref25: 1413µS/cm Cell Const : 0.478 1/cm Probe : +++

53

Operation Multi 1970i

4.7.4 Clearing the memory

With this function, you can delete the stored data records. 500 storage locations will then be available again.

Note

The Clear memory function only appears when there are data records stored in the memory. Otherwise, the measuring instrument automatically switches to the last active measuring mode.

Proceed as follows to clear all data records:

1 Switch off the measuring instrument.

2 Press the <STO> key and hold it down.

3 Press the <ON/OFF> key.

The display test appears briefly on the display.

m

%

1/

°

mg/l

S/

cm

%

C

REL1

AR

pH/mV

cm

K

/

REL2

Sal

TP

RCL

pH

S

O

Sal

Time Baud

Day.Month

Year

LoBat

4 Confirm the clearing process with <RUN/ENTER>.

Note

The calibration data remain stored and can be called up.

S

Lin

d

Oxi

To

C L R

Auto

Store

TEC

ARng

Cal

C

No.

Ident

Tref25 Tref20

nLF

Pressing any other key prevents the clearing, the data records will remain stored.

54

Multi 1970i Operation

4.8 Transmitting data

You have the following possibilities of transmitting data:

z One of the following options:

– With the AutoStore function (page 46), the measured values of all

connected and active sensors are stored periodically and output to the interface (save interval Int 1).

– With the Data transmission interval (Int 2), the measured values

of all connected and active sensors are periodically output to the interface (see below).

– AutoStore (Int 1) covers the Data transmission interval

(Int 2).

z Press the <RUN/ENTER> key

This manually triggers a data transmission of the current measured value to the serial interface at any time - independently of the selected intervals.

Setting the

Data transmission

interval

z With the Output data storage function (page 48), calibration data or

saved measured values are output on the interface.

4.8.1 Data transmission interval (Int 2)

The interval for the data transmission (Int 2) determines the chronological interval between automatic data transmissions. After the selected interval expires, the current data record is transmitted to the interface.

The default setting for the interval is OFF. To start the data transmission, set an interval (5 s, 10 s, 30 s, 1 min, 5 min, 10 min, 15 min, 30 min, 60 min):

1 Press the <RUN/ENTER> key and hold it down.

2 Press the <RCL> key. Int 2 appears on the display.

m

%

1/

°

mg/l

S/

cm

%

C

REL1

AR

pH/mV

cm

Sal

K

/

REL2

TP

RCL

pH

S

O

Sal

I

Time Baud

Day.Month

Year

LoBat

n

No.

Ident

d

Tref25 Tref20

Lin

nLF

T2

O F F

Store

Auto

Oxi

Cal

TEC

ARng

3 Set the required interval between the saving procedures with

<▲> <▼>.

55

Operation Multi 1970i

4 Confirm with <RUN/ENTER>.

The measuring instrument switches to the last active measuring mode.

Note

When the AutoStore function is active at the same time, the data transmission is performed according to the setting of the save interval (Int 1). Set the save interval (Int 1) to OFF to activate the Data transmission in- terval (Int 2).

56

Multi 1970i Operation

S

4.8.2 PC/external printer (RS232 interface)

Via the RS 232 interface, you can transmit the data to a PC or an external printer. Use the AK340/B (PC) or AK325/S (ext. printer) cable to connect the interface to the devices.

Warning

The RS232 interface is not galvanically isolated. When connecting an earthed PC/printer, measurements cannot be performed in earthed media as incorrect values would result.

Set up the following transmission data at the PC/printer:

Baud rate selectable between: 1200, 2400, 4800, 9600

Handshake RTS/CTS + Xon/Xoff

PC only:

Socket assignment

Parity none

Data bits 8

Stop bits 2

1 CT 2 RxD

2

1

4

3

RS 232

REC

4.8.3 Remote control

The measuring instrument can be remotely controlled from a PC. This requires the KOM pilot communication kit. It is available as an accessory. The instrument is then controlled via commands that simulate keystrokes and request the current display contents.

3 Ground 4TxD

Note

A more detailed description is provided within the scope of delivery of the communication kit.

57

Operation Multi 1970i

4.9 Configuration

You can adapt the measuring instrument to your individual requirements. To do this, the following parameters can be changed (the status on delivery is marked in bold):

Baud rate 1200, 2400, 4800, 9600

Air pressure display Current value in mbar

(no input possible)

Baudrate

Calibration intervals

– pH: 1 ... 7 ... 999 dInt 3

1 ... 14 ... 999 dInt 4

– O

2

– : 1 ... 180 ... 999 dInt 5

Date/time Any

Note

You can leave the configuration menu at any time with <M> . The parameters that have already been changed are stored.

1 Switch off the measuring instrument.

2 Press the <M> key and hold it down.

3 Press the <ON/OFF> key.

The display test appears briefly on the display. The measuring instrument then switches automatically to the setting of the baud rate.

m

%

1/

°

mg/l

S/

cm

%

C

REL1

AR

pH/mV

cm

K

/

REL2

Sal

TP

RCL

pH

O

Sal

Time

Day.Month

Year

LoBat

S

Baud

No.

Ident

Tref25 Tref20

Lin

nLF

8 0 0

4

Auto

Oxi

Cal

Store

TEC

ARng

58

4 Select the required baud rate with <▲> <▼>.

5 Confirm with <RUN/ENTER>. CAL dISP appears on the dis-

play.

Multi 1970i Operation

Display during the

pH calibration

Displaying the

air pressure

mV

%

m

1/

°

mV

%

m

1/

°

mg/l

S/

cm

%

C

REL1

AR

mg/l

S/

cm

%

C

REL1

AR

pH/

cm

Sal

K

/

REL2

pH/

cm

Sal

K

/

REL2

TP

RCL

TP

RCL

pH

S

O

Sal

Time Baud

Day.Month

Year

LoBat

6 Select the required display during the pH calibration with

7 Confirm with <RUN/ENTER>. P appears on the display.

The air pressure in mbar is only displayed if a D. O. sensor is connected to the active REL socket. Otherwise, "---" appears.

pH

C

Lin

d

Oxi

AL

I S P

Store

Auto

TEC

ARng

Cal

C

No.

Ident

Tref25 Tref20

nLF

<▲> <▼>.

mV: Display of the current electrode voltage /pH: Display of the buffer nominal value.

S

O

Sal

Time Baud

Day.Month

Year

LoBat

C

No.

Ident

Tref25 Tref20

Lin

nLF

CA

d

9 4 9

Auto

Store

Cal

Oxi

TEC

P

ARng

pH calibration interval

8 Confirm with <RUN/ENTER>. Int 3 and the measured variable

pH appear on the display.

m

%

1/

°

mg/l

S/

cm

%

C

REL1

AR

pH/mV

cm

Sal

K

/

REL2

TP

RCL

pH

S

O

Sal

I

Baud

Time

Day.Month

LoBat

10 Confirm with <RUN/ENTER>. Int 4 and the measured variable

No.

Year

Ident

d

Tref25

Tref20

nLF

Oxi

Lin

9 Set the required interval in days (d) with <▲> <▼>.

appear on the display.

O

2

4

Auto

3nt

1

7

Store

ARng

TEC

Cal

59

Operation Multi 1970i

Dissolved oxygen

calibration interval

Conductivity

calibration interval

m

%

1/

°

mg/l

S/

cm

%

C

REL1

AR

pH/mV

cm

K

/

REL2

Sal

TP

RCL

pH

O

Sal

Time

Day.Month

Year

LoBat

S

I

Baud

Ident

Tref25

nLF

4nt

No.

4

1 4

Auto

Store

Oxi

Cal

TEC

ARng

Lin

d

Tref20

11 Set the required interval in days (d) with <▲> <▼>.

12 Confirm with <RUN/ENTER>. Int 5 and the measured variable

appears on the display.

m

%

1/

°

mg/l

S/

cm

%

C

REL1

AR

pH/mV

cm

K

/

REL2

Sal

TP

RCL

pH

O

Sal

Time

Day.Month

Year

LoBat

S

I

Baud

Ident

Tref25

nLF

5nt

No.

8 0

1

Auto

Store

Oxi

Cal

TEC

ARng

Lin

d

Tref20

Switching over the

reference temperature

13 Set the required interval in days (d) with <▲> <▼>.

14 Confirm with <RUN/ENTER>. The reference temperature set

for conductivity measurements appears on the display.

m

%

1/

°

mg/l

S/

cm

%

C

REL1

AR

pH/mV

cm

K

/

REL2

Sal

TP

RCL

pH

O

Sal

Time

Day.Month

Year

LoBat

S

I

Baud

Ident

Tref25

nLF

5t2

No.

Tref20

Lin

8 0d 1

Auto

Store

Cal

Oxi

TEC

ARng

15 Using <▲> <▼>, toggle between 25 °C (Tref25) and 20 °C

(Tref20).

16 Confirm with <RUN/ENTER>.

The date flashes on the display.

60

Multi 1970i Operation

Date and time

m

%

1/

°

mg/l

S/

cm

%

C

REL1

AR

pH/mV

cm

Sal

K

/

REL2

TP

RCL

pH

O

Sal

Time

Day.Month

Year

LoBat

S

I

Baud

No.

Ident

0 9 0 4

Tref25

Tref20

nLF

Lin

5t2

Auto

Store

Cal

Oxi

TEC

ARng

17 Set the date of the current day with <▲> <▼>.

18 Confirm with <RUN/ENTER>.

The date (month) flashes in the display.

19 Set the current month with <▲> <▼>.

20 Confirm with <RUN/ENTER>.

The year appears on the display.

21 Set the current year with <▲> <▼>.

22 Confirm with <RUN/ENTER>.

The hours flash on the display.

23 Set the current time with <▲> <▼>.

24 Confirm with <RUN/ENTER>.

The minutes flash on the display.

25 Set the current time with <▲> <▼>.

26 Confirm with <RUN/ENTER>.

The measuring instrument switches to the last active measuring mode.

61

Operation Multi 1970i

4.10 Reset

You can reset (initialize) the measurement parameters and the configuration parameters separately from one another.

Measurement

parameters

pH

O

The following measurement parameters (pH/O

/ InI) can be reset to

2

the delivery status:

Measuring mode pH

Asymmetry 0 mV

Slope -59.16 mV

2

Measuring mode D. O. concentration

Relative slope 1.00

Salinity (value) 0.0

Salinity (function) Off

Measuring mode

-1

Cell constant 0.475 cm

(fixed)

Configuration

parameters

Note

The calibration data gets lost when the measuring parameters are reset. Recalibrate after performing a reset.

The following configuration parameters (InI) are reset to the delivery status:

Baud rate 4800

Display during the

Buffer nominal value

pH calibration

Interval 1 (automatically saved) OFF

Interval 2 (for data transmission) OFF

62

Multi 1970i Operation

Resetting the

measuring parameters

1 Press the <RUN/ENTER> key and hold it down.

2 Press the <CAL> key. The setting to reset the pH measuring

parameters appears on the display.

m

%

1/

°

mg/l

S/

cm

%

C

REL1

AR

pH/mV

cm

Sal

K

/

REL2

TP

RCL

pH

O

Sal

Time

Day.Month

Year

LoBat

S

I

Baud

Ident

Tref25

nLF

No.

0 9

Tref20

Lin

iin

n o

Auto

Store

Cal

Oxi

TEC

ARng

3 Using <▲> <▼>, switch between no and YES.

YES: Resetting the pH measuring parameters no: Retaining settings.

4 Confirm with <RUN/ENTER>.

The measuring instrument switches to the setting to reset the O

measuring parameters.

2

m

%

1/

°

mg/l

S/

cm

%

C

REL1

AR

pH/mV

cm

Sal

K

/

REL2

TP

RCL

pH

O

Sal

Time

Day.Month

Year

LoBat

S

I

Baud

Ident

Tref25

nLF

No.

0 9

Tref20

Lin

iin

n o

Auto

Store

Cal

Oxi

TEC

ARng

5 Using <▲> <▼>, switch between no and YES.

YES: Resetting the O

measuring parameters.

2

no: Retaining settings.

6 Confirm with <RUN/ENTER>. The measuring instrument

switches to the setting to reset the Cond measuring parameters.

63

Operation Multi 1970i

%

m

1/

°

S/

C

pH/mV

mg/l

cm

%

/

REL1

AR

K

Sal

TP

REL2

RCL

pH

O

Sal

Time

Day.Month

Year

LoBat

S

I

Baud

Ident

Tref25

nLF

No.

0 9

Lin

Tref20

iin

n o

Auto

Store

Cal

Oxi

TEC

ARng

7 Using <▲> <▼>, switch between no and YES.

YES: Resetting the Cond measuring parameters. no: Retaining settings.

8 Confirm with <RUN/ENTER>.

The measuring instrument switches to the configuration parameters.

m

%

1/

°

mg/l

S/

cm

%

C

REL1

AR

pH/mV

cm

K

/

REL2

Sal

TP

RCL

pH

O

Sal

Time

Day.Month

Year

LoBat

S

I

Baud

Ident

Tref25

nLF

No.

0 9

Tref20

Lin

iin

n o

Auto

Store

Cal

Oxi

TEC

ARng

Resetting the

configuration parame-

ters

9 Using <▲> <▼>, switch between no and YES.

YES: Resetting the configuration parameters no: Retaining settings.

10 Confirm with <RUN/ENTER>.

The measuring instrument switches to the last active measuring mode.

64

Multi 1970i Maintenance, cleaning, disposal

5 Maintenance, cleaning, disposal

5.1 Maintenance

The measuring instrument is maintenance-free.

5.2 Cleaning

Occasionally wipe the outside of the measuring instrument with a damp, lint-free cloth. Disinfect the housing with isopropanol as required.

Warning

The housing components are made out of synthetic materials (polyurethane, ABS and PMMA). Thus, avoid contact with acetone and similar detergents that contain solvents. Remove any splashes immediately.

5.3 Disposal

Packing This measuring instrument is sent out in a protective transport packing.

We recommend: Keep the packing material. The original packing protects the measuring instrument from transport damages.

Rechargeable battery Remove the rechargeable battery from the instrument and dispose of it

at a suitable facility according to local legal requirements. It is illegal to dispose of the rechargeable battery with household refuse. Proceed as follows to disassemble the rechargeable battery:

1

Ni-Cd Cd

1

1 Remove the carrying and positioning handle or the carrying

strap.

2

2 Unscrew the fixing elements (1) using a hexagon key.

3 Remove the instrument from the enclosure by vigorously

pressing against the socket field.

4 Take out the rechargeable battery (2) and cut off the battery ca-

ble.

65

Maintenance, cleaning, disposal Multi 1970i

Measuring instrument Dispose of the measuring instrument without the rechargeable battery

as electronic waste at an appropriate collection point.

66

Multi 1970i What to do if...

6 What to do if...

6.1 pH system messages

Error message 0FL

0FL

0FL0FL

Cause Remedy

pH electrode:

– Not connected – Connect electrode

Error message E3

E3

E3E3

– Air bubble in front of the

– Remove air bubble

diaphragm

– Air in the diaphragm – Extract air or

moisten diaphragm

– Cable broken – Replace electrode

– Gel electrolyte dried out – Replace electrode

Cause Remedy

Electrode

– Diaphragm contaminated – Clean diaphragm

– Membrane contaminated – Clean membrane

– Moisture in the plug – Dry plug

– Electrolyte obsolete – Replenish electrolyte or

replace electrode

– Electrode obsolete – Replace electrode

– Electrode broken – Replace electrode

Measuring instrument:

– Incorrect calibration procedure – Select correct procedure

– Incorrect solution temperature

– Set up correct temperature

(without temperature sensor)

– Socket damp – Dry socket

67

What to do if... Multi 1970i

Buffer solutions

– Incorrect buffer solutions – Change calibration procedure

– Buffer solutions too old – Use only once.

Note the shelf life

– Buffer solutions depleted – Change solutions

No stable measured

Cause Remedy

value

pH electrode:

– Diaphragm contaminated – Clean diaphragm

– Membrane contaminated – Clean membrane

Obviously incorrect

measured values

Test sample:

– pH value not stable – Measure with air excluded if

necessary

– Temperature not stable – Adjust temperature if

necessary

Electrode + test sample:

– Conductivity too low – Use suitable electrode

– Temperature too high – Use suitable electrode

– Organic liquids – Use suitable electrode

Cause Remedy

pH electrode:

– pH electrode unsuitable – Use suitable electrode

– Temperature difference

between buffer and test

– Adjust temperature of buffers

or sample

sample too high

68

– Measurement procedure not

suitable

– Follow special procedure

Multi 1970i What to do if...

6.2 Oxi system messages

Error message 0FL

Error message E3

0FL

0FL0FL

E3

E3E3

Cause Remedy

Display range exceeded

Oxygen sensor

– Not connected – Connect the sensor

– Cable broken – Replace sensor

– Depleted – Replace sensor

– Short-circuit between gold and

lead electrode

– Clean sensor and replace it if

necessary

Cause Remedy

Invalid calibration

Oxygen sensor

– Electrolyte solution depleted – Regenerate sensor

– Membrane contaminated – Clean membrane

Error message E7

E7

E7E7

AR flashes

continuously

– Electrode system poisoned – Regenerate sensor

– Obsolete – Replace sensor

– Broken – Replace sensor

Cause Remedy

Membrane damaged

– Membrane damaged – Regenerate sensor

– Membrane head screwed on

– Screw membrane head tight

not tight enough

Cause Remedy

No stable measured value

– Membrane contaminated – Clean membrane

69

What to do if... Multi 1970i

Measured value too low

Measured value too

high

Error message OFL

OFL

OFLOFL

Cause Remedy

– Insufficient flow – Provide flow to the sensor

Cause Remedy

– High amount of dissolved

substances

– Air bubbles bump on the

membrane with high velocity

– The carbon dioxide pressure is

– Correct solubility function

using the salinity equivalent

– Avoid direct flow to the

membrane

– Measuring not possible

too high (> 1 bar)

6.3 Conductivity system messages

Cause Remedy

Error message E3

E3

E3E3

The measured value lies outside the measuring range

– Measuring cell not connected – Connect measuring cell

– Cable broken – Replace measuring cell

Cause Remedy

– Measuring cell contaminated – Clean cell and replace it if

necessary

– Unsuitable calibration

– Check calibration solutions

solution

70

Multi 1970i What to do if...

6.4 General errors

Display LoBat

Instrument does not

react

to keystroke

Display to

to

toto

Cause Remedy

– Battery almost empty – Charge the battery (see

section 3.2)

Cause Remedy

– Operating condition undefined

or EMC load unallowed

– Processor reset:

Switch the instrument on while pressing the <RCL> key

Cause Remedy

Sensor symbol flashes

Message StoFull

StoFull

StoFullStoFull

You want to know which

software version is in

the instrument

– Time-out of the interface – Check the instrument

connected

Cause Remedy

– Calibration interval expired – Recalibrate the measuring

system

Cause Remedy

– All memory locations are full – Output data storage and clear

data storage

Cause Remedy

– E. g., a question by the WTW

service department

– Simultaneously press the

<CAL> and <ON/OFF> keys and release them again. The software version is displayed.

71

What to do if... Multi 1970i

72

Multi 1970i Technical data

7 Technical data

7.1 General data

Dimensions approx. 90 x 200 x 190 mm

Weight approx. 1.5 kg (without plug-in power supply)

Mechanical structure Type of protection IP 67

Electrical safety Protective class III

Test certificates CE

Ambient conditions Storage - 25 °C ... + 65 °C

Operation -10 °C ... + 55 °C

Climatic class 2

Power

supply

Rechargeable battery Nickel-cadmium(NiCad) rechargeable bat-

tery

Operational life approx. 600 hours with one charging

Plug-in power supply unit (charging device)

The following applies to all plug-in power supplies:Connection max. Overvoltage category II

Plug-in power supply unit (Euro, US , UK, Australian plug) FRIWO FW7555M/09, 15.1432 Friwo Part. No. 1883259 Input: 100 ... 240 V ~ / 50 ... 60 Hz / 400 mA Output: 9 V = / 1,5 A

73

Technical data Multi 1970i

Serial

interface

Guidelines

and norms used

Connection of the cable AK 340/B or AK 325/S

Baud rate adjustable: 1200, 2400, 4800, 9600 Baud

Type RS232, data output

Data bits 8

Stop bits 2

Parity None

Handshake RTS/CTS + Xon/Xoff

Cable length Max. 15m

EMC EC guideline 89/336/EEC

EN 61326-1:1998 EN 61000-3-2 A14:2000 EN 61000-3-3:1995 FCC Class A

Instrument safety E.C. guideline 73/23/EEC

EN 61010-1 A2:1995

Manual

temperature input

Climatic class VDI/VDE 3540

IP protection EN 60529:1991

7.2 Measuring ranges, resolutions, accuracies

7.2.1 pH/ORP

Variable Measuring

range

pH - 2.00 ... + 19.99 0.01 ± 0.01 *

U [mV] - 1999 ... + 1999 1 ± 1

T [°C] - 5.0 ... + 105.0 0.1 ± 0.1

* when measuring in a range of ± 2 pH around a calibration point

Variable Range Increment

T

[°C] - 20 ... + 130 1

manual

Resolution Accuracy

(± 1 Digit)

74

Multi 1970i Technical data

7.2.2 Dissolved oxygen

Measuring ranges

and resolutions

Accuracies Variable Accuracy (± 1 Digit)

Correction

functions

Variable Measuring range Resolution

Concentration [mg/l] 0 ... 19.99

0 ... 90.0

Saturation [%] 0 ... 199.9

0 ... 600

0.01

0.1

0.1 1

T [°C] 0 ... 50.0 0.1

Concentration [mg/l] ± 0.5 % of measured value

at ambient temperature of 5 °C ... 30 °C

Saturation [%] ± 0.5 % of measured value

when measuring in the range of ± 10 K around the calibration temperature

T [°C] ± 0.1

Temperature com-

Accuracy better than 2 % at 0 ... 40 °C

pensation

Salinity correction 0 ... 70.0 SAL

Air pressure correction

Automatic through integrated pressure sensor in the range of 500 ... 1100 mbar

75

Technical data Multi 1970i

7.2.3 Conductivity

Measuring ranges

and resolutions

Accuracies Variable Accuracy (± 1 Digit)

Variable Measuring range Resolution

[µS/cm] 0 ... 1999 1

[mS/cm] 0.00 ... 19.99

0.0 ... 199.9 0 ... 500

SAL 0.0 ... 70.0

0.01

0.1 1

0.1 according to the IOT table

T [°C] − 5.0 ... + 105.0 0.1

[µS/cm] / [mS/cm]

Accuracy Sample temperature ± 0.5 % 0 °C ... 35 °C

(nonlinear compensation)

± 0.5 % 35 °C ... 50 °C

according to EN 27 888;

extended nLF function according to WTW measurements

Cell constant,

calibrating

Reference

temperature

SAL

Accuracy Sample temperature ± 0.1 5 °C ... 25 °C

(range 0.0 ... 42.0)

± 0.2 25 °C ... 30 °C

T [°C] ± 0.1

C [cm-1] 0.450 ... 0.500

Tref Can be set to 20 °C or 25 °C

76

Multi 1970i Lists

8Lists

This chapter provides additional information and orientation aids.

Abbreviations The list of abbreviations explains the indicators and the abbreviations

that appear on the display and in the manual.

Specialist terms The glossary briefly explains the meaning of the specialist terms. How-

ever, terms that should already be familiar to the target group are not described here.

Index The index helps you to find the topics that you are looking for.

77

Lists Multi 1970i

Abbreviations

Conductivity value (international γ)

AR AutoRead (drift control)

ARng Automatic range switching

Measuring instrument measures with highest resolution

ASY Asymmetry

AutoCal DIN Automatic pH calibration with buffer solutions pre-

pared according to DIN 19 266

AutoCal TEC Automatic pH calibration with WTW technical buff-

er solutions according to DIN 19267

-1

C Cell constant [cm

] (internat. k)

°C Temperature unit, degrees Celsius

Cal Calibration

Cd... Display indicator during calibration for pH mea-

surements. Indicates the selection of the buffer data record for buffer solutions prepared according to DIN 19 266

Cm... Display indicator during calibration for pH mea-

surements. Indicates the selection of buffer data records for buffer solutions of the Merck company

ConCal Conventional single-point or two-point calibration

for pH measurements

Ct... Display indicator during calibration for pH mea-

surements. Indicates the selection of the buffer data records for WTW technical buffer solutions

E3 Error message

see chapter 6 W

HAT TO DO IF...

InI Initialization

Resets individual basic functions to the status they had on delivery

78

LoBat Battery nearly empty (Low Battery)

mV Voltage unit

mV/pH Unit of the electrode slope (internat. mV)

Multi 1970i Lists

nLF Nonlinear temperature compensation

OFL Display range exceeded (Overflow)

OxiCal Automatic calibration for D. O. measurements

pH pH value

S Slope (internat. k)

SAL Salinity

SELV Safety Extra Low Voltage

SLO Slope setting on calibration

TC Temperature coefficient (internat. α)

TP Temperature measurement active (temperature

sensor)

25/T25 Reference temperature of 25 °C

T

Ref

U

ASY

Asymmetry

79

Lists Multi 1970i

Glossary

Adjusting To manipulate a measuring system so that the relevant value (e. g. the

displayed value) differs as little as possible from the correct value or a value that is regarded as correct, or that the difference remains within the tolerance.

Asymmetry Designation for the offset potential of a pH electrode. It is the measur-

able potential of a symmetrical electrode, the membrane of which is immersed in a solution with the pH of the nominal electrode zero point (WTW electrodes: pH = 7).

AutoRange Name of the automatic selection of the measuring range.

AutoRead WTW name for a function to check the stability of the measured value.

Calibration Comparing the value from a measuring system (e. g. the displayed

value) to the correct value or a value that is regarded as correct. Often, this expression is also used when the measuring system is adjusted at the same time (see adjusting).

Cell constant, k Characteristic quantity of a conductivity measuring cell, depending on

the geometry.

Conductivity Short form of the expression, specific electrical conductivity. It is a

measured value of the ability of a substance to conduct an electric current. In water analysis, the electrical conductivity is a dimension for the ionized substances in a solution.

D. O. partial pressure Pressure caused by the oxygen in a gas mixture or liquid.

Diaphragm The junction is a porous body in the housing wall of reference elec-

trodes or electrolyte bridges. It forms the electrical contact between two solutions and makes electrolyte exchange more difficult. The expression, junction, is also used for ground or junction-less transitions.

Electrode zero point The zero point of a pH electrode is the pH value at which the electro-

motive force of the pH electrode at a specified temperature is zero. Normally, this is at 25 °C.

Electromotive force of

an electrode

The electromotive force U of the electrode is the measurable electromotive force of an electrode in a solution. It equals the sum of all the galvanic voltages of the electrode. Its dependency on the pH results in the electrode function which is characterized by the parameters, slope and zero point.

Measured parameter The measured parameter is the physical dimension determined by

measuring, e. g. pH, conductivity or D. O. concentration.

Measured value The measured value is the special value of a measured parameter to

be determined. It is given as a combination of the numerical value and unit (e. g. 3 m; 0.5 s; 5.2 A; 373.15 K).

80

Multi 1970i Lists

Measuring system The measuring system comprises all the devices used for measuring,

e. g. measuring instrument and sensor. In addition, there is the cable and possibly an amplifier, terminal strip and armature.

Molality Molality is the quantity (in Mol) of a dissolved substance in 1000 g sol-

vent.

MultiCal

®

WTW name stating that a measuring instrument provides several calibration procedures.

Offset potential The measurable potential of a symmetrical electrode, the membrane

of which is immersed in a solution with the pH of the nominal electrode zero point. The asymmetry is part of the offset potential.

OxiCal

®

WTW name for a procedure to calibrate D. O. measuring systems in water vapor saturated air.

Oxygen saturation Short name for the relative D. O. saturation.

Note: The D. O. saturation value of air-saturated water and the D. O. saturation value of oxygen-saturated water are different.

pH value The pH is a measure of the acidic or basic effect of an aqueous solu-

tion. It corresponds to the negative decadic logarithm of the molal hydrogen ions activity divided by the unit of the molality. The practical pH value is the value of a pH measurement.

Potentiometry Name of a measuring technique. The signal (depending on the mea-

sured parameter) of the electrode is the electrical potential. The electrical current remains constant.

ORP voltage The ORP is caused by oxidizing or reducing substances dissolved in

water if these substances become effective on an electrode surface (e. g. a gold or platinum surface).

Reference

temperature

Fixed temperature value to compare temperature-dependent measured values. For conductivity measurements, the measured value is converted to a conductivity value at a reference temperature of 20 °C or 25 °C.

Reset Restoring the original condition of all settings of a measuring system.

Resistance Short name for the specific electrolytic resistance. It corresponds to

the reciprocal value of the electrical conductivity.

Resolution Smallest difference between two measured values that can be dis-

played by a measuring instrument.

Salinity The absolute salinity S

of the mass of dissolved salts to the mass of the solution (in g/Kg). In practice, this dimension cannot be measured directly. Therefore, the practical salinity is used for oceanographic monitoring. It is determined by measuring the electrical conductivity.

of seawater corresponds to the relationship

A

81

Lists Multi 1970i

Salt content General designation for the quantity of salt dissolved in water.

Sample Designation of the sample ready to be measured. Normally, a test

sample is made by processing the original sample. The test sample and original sample are identical if the test sample was not processed.

Setting the

temperature

compensation

Name of a function that considers the temperature influence on the measurement and converts it accordingly. Depending on the measured parameter to be determined, the temperature compensation functions in different ways. For conductimetric measurements, the measured value is converted to a defined reference temperature. For potentiometric measurements, the slope value is adjusted to the temperature of the test sample but the measured value is not converted.

Slope The slope of a linear calibration function.

Slope (relative) Designation used by WTW in the D. O. measuring technique. It ex-

presses the relationship of the slope value to the value of a theoretical reference sensor of the same type of construction.

Standard solution The standard solution is a solution where the measured value is

known by definition. It is used to calibrate a measuring system.

TDS Total dissolved solids

Temperature

Value of the slope of a linear temperature function.

coefficient

Temperature function Name of a mathematical function expressing the temperature behav-

ior of a test sample, a sensor or part of a sensor.

82

Multi 1970i Index

A

Air pressure display 59 Asymmetry 21 Authorized use 9 AutoCal TEC 21, 24 AutoRead

Conductivity Criteria 31 Oxygen 31 pH 19

39

B

Batteries

Charging Charging time 11

11

C

Calibration

Conductivity D. O. 32 pH 21

Calibration evaluation

D. O.

33

Dissolved oxygen 33

Calibration interval 43

conductivity 60 Dissolved oxygen 60 pH 59

Calibration protocol 21

conductivity 40 D. O. 32

Cell constant 37, 40 Conductivity calibration evaluation

41

Configuration parameters 62 Connecting a printer 57

40

D

D. O.

Measuring the concentra-

tion

29

Measuring the saturation

30

Data record 44 Delivery status 62 Display 4 Drift control

Conductivity Oxygen 31 pH 19

39

E

Energy saving feature 16 Error messages 69, 70

I

Initial commissioning 12, 14 Initialization 62 Interval

Calibration (Int 3) save 46

43

J

Jack field 5

K

Keys 5

M

Mains operation 11 Measuring 36

conductivity 38 D. O. concentration 29 D. O. saturation 30 ORP voltage 20 pH value 19 Salinity 38

Measuring mode when switching on Measuring ranges

Conductivity

Measuring the conductivity

16

76

38

Measuring the salinity 38

O

Operating 15 Operating safety 10 ORP electrode 20 ORP voltage 20

P

pH calibration evaluation 23 pH value 19 Plug-in power supply 11 Precautions 9

R

Reference temperature (conductivity) Remote control 57 Reset 62 Resetting the measuring parameters RS232 interface 57 RS232 socket assignment

37

63

57

S

Safety 9 Salt content correction

entering the salinity

switching on 29 Save interval 46 Saving data 44 Scope of delivery 11 Setting the baud rate 58 Setting the date 12, 14, 61 Setting the reference temperature

60

Setting the time 12, 61 Single-point calibration 21 Single-point calibration (pH)

35

21, 25

Slope 21, 32

T

Temperature compensation (conductivity) Temperature probe

Conductivity Temperature sensor

D. O.

pH 18 Transmitting data 55 Transmitting measured val-

37

36

28

83

Index Multi 1970i

ues 55 Two-point calibration 21 Two-point calibration (pH)

21, 25

84

Wissenschaftlich-Technische Werkstätten GmbH

Dr.-Karl-Slevogt-Straße 1 D-82362 Weilheim

Germany

Tel: +49 (0) 881 183-0

+49 (0) 881 183-100 Fax: +49 (0) 881 183-420 E-Mail: Info@WTW.com Internet: http://www.WTW.com

Xylem MULTI-1970I User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

1Overview

1.1 General features

1.2 Display

1.3 Keypad

1.4 Jack field

2 Safety

2.1 Authorized use

2.2 General safety instructions

3 Commissioning

3.1 Scope of delivery

3.2 Power supply

3.3 Initial commissioning

3.4 Sensor quiver

4 Operation

4.1 Operating structure

4.2 Switching on the measuring instrument

4.3 pH value / ORP voltage

4.3.1 General information

4.3.2 Measuring the pH value

4.3.3 Measuring the ORP voltage

4.3.4 pH calibration

4.4 Dissolved oxygen

4.4.1 General information

4.4.2 Measuring the D. O. concentration

4.4.3 Measuring the D. O. saturation

4.4.4 AutoRead AR (Drift control) and hold function

4.4.5 D. O. calibration

4.4.6 Entering the salt content (salinity)

4.5 Conductivity

4.5.1 General information

4.5.2 Measuring the conductivity

4.5.3 Measuring the salinity

4.5.4 AutoRead AR (Drift control) and hold function

4.5.5 Determining the cell constant (Calibration in the control standard)

4.7 Saving data

4.7.1 Saving manually

4.7.2 Switching on AutoStore (Int 1)

4.7.3 Outputting the data storage

4.7.4 Clearing the memory

4.8 Transmitting data

4.8.1 Data transmission interval (Int 2)

4.8.3 Remote control

4.9 Configuration

4.10 Reset

5 Maintenance, cleaning, disposal

5.1 Maintenance

5.2 Cleaning

5.3 Disposal

6 What to do if...

6.1 pH system messages

6.2 Oxi system messages

6.3 Conductivity system messages

6.4 General errors

7 Technical data

7.1 General data

7.2 Measuring ranges, resolutions, accuracies

7.2.1 pH/ORP

7.2.2 Dissolved oxygen

7.2.3 Conductivity

8Lists