Xylem MULTI-3400i User Manual

Download

Page 1

pH/Cond 3400i

Tref25

nLF

Operating manual

ba75687e01 01/2007

pH/Conductivity measuring instrument

Page 2

Accuracy when

going to press

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

The use of advanced technology and the high quality standard of our instruments are the result of 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.

purchase. The instrument warranty covers manufacturing faults that are discovered within the warranty period. The warranty does not cover components that are replaced during maintenance work, e.g. batteries.

The warranty claim extends to restoring the instrument to readiness for use but not, however, to any further claim for damages. Improper handling or unauthorized opening of the instrument invalidates any warranty claim.

To ascertain the warranty liability, return the instrument and proof of purchase together with the date of purchase freight paid or prepaid.

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

Page 3

pH/Cond 3400i Contents

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

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

1.2 SETs of equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.3 Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

1.4 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

1.5 Jack field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

1.6 Operating structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2.1 Authorized use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2.2 General safety instructions . . . . . . . . . . . . . . . . . . . . . . . 12

3 Commissioning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

3.1 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

3.2 Initial commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

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

4.1 Switching on the measuring instrument . . . . . . . . . . . . . 15

4.2 pH value / ORP voltage . . . . . . . . . . . . . . . . . . . . . . . . . 16

4.2.1 General information . . . . . . . . . . . . . . . . . . . . . . 16

4.2.2 Measuring the pH value . . . . . . . . . . . . . . . . . . 18

4.2.3 Measuring the ORP voltage . . . . . . . . . . . . . . . 20

4.3 pH calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

4.3.1 AutoCal TEC . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

4.3.2 AutoCal DIN . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

4.3.3 ConCal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

4.4 Conductivity/Salinity . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

4.4.1 General information . . . . . . . . . . . . . . . . . . . . . . 33

4.4.2 Measuring the conductivity . . . . . . . . . . . . . . . . 35

4.4.3 Measuring the salinity . . . . . . . . . . . . . . . . . . . . 35

4.4.4 AutoRead AR (drift control) . . . . . . . . . . . . . . . . 36

4.4.5 Determining the cell constant (Calibration in the

control standard) . . . . . . . . . . . . . . . . . . . . . . . . 37

4.4.6 Setting the temperature compensation . . . . . . . 40

4.5 Calibration intervals (Int 3, Int 5) . . . . . . . . . . . . . . . . . . 44

4.6 Saving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

4.6.1 Saving manually . . . . . . . . . . . . . . . . . . . . . . . . 45

4.6.2 Switching on AutoStore (Int 1) . . . . . . . . . . . . . 47

4.6.3 Outputting the data storage . . . . . . . . . . . . . . . . 49

4.6.4 Clearing the memory . . . . . . . . . . . . . . . . . . . . . 54

4.7 Transmitting data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

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

4.7.2 PC/external printer (RS232 interface) . . . . . . . . 56

4.7.3 Remote control . . . . . . . . . . . . . . . . . . . . . . . . . 57

4.8 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

4.9 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

Page 4

Contents pH/Cond 3400i

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

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

5.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

5.3 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

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

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

6.2 Conductivity system messages . . . . . . . . . . . . . . . . . . . 69

6.3 General errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

7 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

8 Lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

Page 5

pH/Cond 3400i Overview

1Overview

1.1 General features

This compact precision handheld meter enables you to carry out pH / ORP measurements and conductivity measurements rapidly and reliably. The handheld meter provides the maximum degree of operating comfort, reliability and measuring certainty for all applications.

The proven MultiCal

calibration procedures or the proven procedure for adjusting or setting the cell constant and the special AutoRead function support you in your work with the handheld meter.

Tref25

nLF

1 Keypad

2 Sample display

3 Jack field

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.

Page 6

Overview pH/Cond 3400i

1.2 SETs of equipment

The measuring instrument is also available as part of individual SETs of equipment. You will find additional information on this and other accessories in the WTW catalog or via the Internet.

Page 7

pH/Cond 3400i Overview

Set (sample configuration):

1 pH/Cond 3400i measuring instrument

2 Beaker, 50 ml

3 Stand

4 Calibration and control standard for conductivity measuring

cells, 50 ml

5 50 ml pH buffer solution, STP 4

6 50 ml pH buffer solution, STP 7

7 Storing solution for pH electrodes

8 Conductivity measuring cell

9 pH combination electrode

10 Plug-in power supply (optional)

Page 8

Overview pH/Cond 3400i

1.3 Keypad

STOM

ARRCLCAL

RUN/ENTER

Key functions

STO

CAL

RCL

Select the measured variable <M>:

– pH value / ORP voltage

– Conductivity / salinity

Save a measured value

<STO>

Switch measuring instrument on/off

Calibrate the currently set measured variable

<CAL>

Display/transmit measured values

<RCL>

Activate/deactivate the AutoRead function

<AR>

Select the measuring mode, increase values, scroll <▲ >

Select the measuring mode, decrease values, scroll <▼ >

RUN/ENTER

Confirm entries, start AutoRead

Page 9

pH/Cond 3400i Overview

1.4 Display

Status display

TDS

UpH

Baud

Time

Day.Month No.

Year

Ident

Tref25

LoBat

nLF

1.5 Jack field

AutoCal DIN

Tref20

Lin

Cal

AutoCal TEC

Sal

mV/pH

mbar

Auto

ARng

mg/l

Store

Sal

RCL

Probe symbol

Meas. value display

Function and temperature display

123

1 TetraCon 325 conductivity measuring cell

2 pH electrode

3 pH temperature sensor

4 Plug-in power supply (optional)

5 Serial interface RS 232

Page 10

Overview pH/Cond 3400i

1.6 Operating structure

The following overview diagram shows which keys you have to press to select between the different measuring modes:

Note

When connecting a conductivity measuring cell with temperature sensor, the measuring instrument recognizes the probe and automatically switches to the last selected conductivity measuring mode. As soon as the probe is disconnected, the instrument switches to the pH or ORP measuring mode.

Page 11

pH/Cond 3400i 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. 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 labels 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 pH and ORP measurement or the measurement of the conductivity and salinity 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

Page 12

Safety pH/Cond 3400i

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 6 W

HAT TO DO IF....

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.

Page 13

pH/Cond 3400i Commissioning

3 Commissioning

3.1 Scope of delivery

z 3400i handheld meter

z Plug-in power supply (optional)

z Operating manual and short operating manual

z 4 batteries, 1.5 V Mignon type AA (in the instrument)

Setting the date and

time

For details of scope of delivery of SETs, see chapter 1.2 SET

EQUIPMENT and WTW catalog.

3.2 Initial commissioning

Perform the following activities:

z Set the date and time

z Connect the plug-in power supply (optional)

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 ap-

pears on the display.

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

5 Confirm with <RUN/ENTER>.

The date (month) flashes in the display.

S OF

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 <▲> <▼>.

Page 14

Commissioning pH/Cond 3400i

13 Confirm with <RUN/ENTER>.

The instrument switches to a measuring mode.

14 Switch the instrument off using <ON/OFF>.

Connecting the original

plug-in power supply

unit

You can either operate the measuring instrument with batteries or with the plug-in power supply. The plug-in power supply supplies the measuring instrument with low voltage (12 VDC). This saves the batteries.

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).

1 Plug the jack (1) into the socket (2) of the measuring instru-

ment.

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

accessible mains socket.

Page 15

pH/Cond 3400i Operation

4 Operation

4.1 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

Connected sensor Measuring mode

No sensor or pH/ORP electrode pH or ORP measurement (de-

pending on the last setting)

Conductivity measuring cell Last selected measuring mode

2 sensors Last selected measuring mode

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.

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).

Page 16

Operation pH/Cond 3400i

4.2 pH value / ORP voltage

4.2.1 General information

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

1 Connect the pH electrode to the measuring instrument.

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

4Using <▲ > <▼>, 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.

Page 17

pH/Cond 3400i Operation

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 a conductivity measuring cell. The measuring instrument recognizes which sensors are connected and automatically switches to the correct mode for the temperature measurement.

The following cases are distinguishable.

Temperature sensor Display Mode

pH Cond

yes - TP Automatic with

pH temperature sensor

yes yes TP

- - Manual

-yesTP flashes

The temperature value of the 2nd sensor (Cond) in the same test sample is used 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.

Page 18

Operation pH/Cond 3400i

4.2.2 Measuring the pH value

1 Perform the preparatory activities according to section 4.2.1.

2 Immerse the pH electrode in the test sample.

3 Press the <▲> <▼> keys until pH appears in the status display.

The pH value appears on the display.

TDS

Baud

Time

Day.Month No.

Year

Ident

Tref25

LoBat

nLF

4 When measuring without a connected temperature sensor:

Options:

z Determine the current temperature using a thermometer

z TP display indicator not displayed, socket for the second

AutoCal DIN

Tref20

Lin

Cal

AutoCal TEC

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

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

SalOU

mV/pH

mbar

Auto

ARng

mg/l

Store

Sal

RCL

AutoRead AR

(drift control)

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.

For identical measurement conditions, the following criteria apply:

Reproducibility Response time

Better than 0.02 > 30 seconds

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

2 Activate the AutoRead function with <AR>.

The current measured value is frozen (hold function).

Page 19

pH/Cond 3400i Operation

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 <AR> key.

Note

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

Page 20

Operation pH/Cond 3400i

4.2.3 Measuring the ORP voltage

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

1 Perform the preparatory activities according to section 4.2.1.

2 Submerse the ORP electrode in the sample.

3 Press the <▲> <▼> keys 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.

Lin

Tref20

Cal

AutoCal DIN AutoCal TEC

SalO

mbar

Auto

ARng

/pH

mg/l

Store

Sal

RCL

TDS

Baud

Time

Day.Month No.

Year

Ident

Tref25

LoBat

nLF

Note

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

Page 21

pH/Cond 3400i Operation

4.3 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

– (after the calibration interval has expired)

– after a voltage interruption, e. g. after changing the batteries

You can select one of 3 calibration procedures:

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 4.8 C 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. When doing so, the instrument uses the Nernst slope (-59,2 mV/pH at 25 °C) and determines the asymmetry of the electrode.

ONFIGURATION), the instrument displays the

AutoCal DIN is specially adapted to the permanently programmed buffer solutions in

ConCal This function is a conventional two-point calibration using two buffer

AutoRead When calibrating with AutoCal TEC and AutoCal DIN, the AutoRead

Displaying the calibra-

tion data

Printing the calibration

record

accordance with DIN 19266 as a fully automatic two-point calibration. The operating sequence of the AutoCal DIN calibration corresponds to that of the AutoCal TEC calibration. The calibration can only be terminated after the first buffer solution (single point calibration).

solutions (pH 7.0 ± 0.5 and any other buffer solution) or a single-point calibration using any buffer solution, which is used as a high-speed method.

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

You can view the data of the last calibration on the display. The proceeding is described on page 51.

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).

Page 22

Operation pH/Cond 3400i

Note

You can automatically print a calibration protocol after the calibration. To do so, connect a printer to the interface according to section 4.7.2 before calibrating. After a valid calibration, the record is printed.

Sample printout:

CALIBRATION PROTOCOL

02.03.01 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 10.00 C1 184.1 mV 25.0°C C2 3.0 mV 25.0°C S1 -59.4 mV/pH ASY1 - 4 mV Probe: +++

Calibration evaluation After the calibration, the measuring instrument automatically evaluates

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

Display Asymmetry

[mV]

Slope [mV/pH]

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

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

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

-57 ... -56

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

-56 ... -50

Clean the electrode according to the electrode operating manual

Eliminate the error according to chapter 6 W

HAT TO DO IF...

< -30 or > 30

... -62 or ... -50

Page 23

pH/Cond 3400i Operation

Preparatory activities

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).

4.3.1 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 4.8 C

ONFIGURATION ), the instrument displays the relevant buff-

er nominal value or the current electrode voltage in mV.

Note

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

1 Press the <CAL> key repeatedly until the Ct1 display indicator

and the function display AutoCal TEC appears. The sensor symbol displays the evaluation of the last calibration (or no sensor symbol in the delivery state or after the measurement parameters have been reset).

Page 24

Operation pH/Cond 3400i

TDS

Baud

Time

Day.Month No.

Year

Ident

Tref25

LoBat

nLF

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

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

3 Immerse the pH electrode in the first buffer solution.

4 Press the <RUN/ENTER> key.

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

Baud

Time

Day.Month No.

Year

Ident

Tref25

LoBat

nLF

Sal

/pH

mg/l

AutoCal DIN

Tref20

Cal

Lin

AutoCal TEC

AutoCal DIN

Tref20

Cal

Lin

AutoCal TEC

mbar

Sal

Store

Auto

ARng

RCL

TDSTDS

Store

Auto

ARng

RCL

Time

Day.Month No.

Year

Tref25

LoBat

nLF

Baud

Ident

Lin

Tref20

Cal

pHpH

OO UpHUpH SalSal

AutoCal DIN AutoCal TEC

mbarmbar

mV/pHmV/pH

1/1/

Auto

ARng

mg/lmg/l

S/S/

cmcm

Store

ARAR

SalSal

RCL

5 When the measured value is stable, Ct2 appears.

Lin

Tref20

Cal

AutoCal DIN AutoCal TEC

Sal

mbar

Auto

ARng

/pH

mg/l

Store

Sal

RCL

TDS

Baud

Time

Day.Month No.

Year

Ident

Tref25

LoBat

nLF

Note

At this point, the AutoCal TEC calibration can be terminated with <M>. This corresponds to a single-point calibration. When doing so, the in-

Page 25

pH/Cond 3400i Operation

strument uses the Nernst slope (-59,2 mV/pH at 25 °C) and determines the asymmetry of the electrode.

6 Thoroughly rinse the electrode with deionized water.

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

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

8 Immerse the pH electrode in the second buffer solution.

9 Press the <RUN/ENTER> key.

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

TDS

Baud

Time

Day.Month No.

Year

Ident

Tref25

LoBat

nLF

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

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

TDS

Tref20

Lin

AutoCal DIN

Cal

AutoCal TEC

Time

Day.Month

Year

LoBat

Baud

No.

Ident

Tref25 nLF

Tref20

Lin

Cal

AutoCal DIN AutoCal TEC

Store

Auto

ARng

RCL

Sal

mV/pH

mg/l

mbar

Sal

Store

Auto

ARng

RCL

TDS

Time

Day.Month No.

Year

Tref25

LoBat

nLF

Baud

Ident

Lin

Tref20

Cal

pHpH

OO UpHUpH SalSal

AutoCal DIN AutoCal TEC

mbarmbar

ARng

mV/pHmV/pH

Auto

1/1/

mg/lmg/l

S/S/

Store

ARAR

cmcm

SalSal

RCL

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

(mV) appears on the display.

Page 26

Operation pH/Cond 3400i

Lin

Tref20

Cal

AutoCal DIN AutoCal TEC

Sal

mbar

Auto

ARng

mg/l

Store

Sal

RCL

TDS

Baud

Time

Day.Month

12 Switch to the measuring mode with <M>.

Year

LoBat

No.

Ident

Tref25 nLF

Page 27

pH/Cond 3400i Operation

4.3.2 AutoCal DIN

For this procedure, use two different standard buffer solutions according to DIN 19266 (type A, C, D or F with pH values at 25 °C of: 1.679 /

4.006 / 6.865 / 9.180).

Note

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

1 Press the <CAL> key repeatedly until the display Cd1 and the

function display AutoCal DIN appear. The sensor symbol displays the evaluation of the last calibration (or no sensor symbol in the delivery state or after the measurement parameter has been reset).

TDS

Baud

Time

Day.Month No.

Year

Ident

Tref25

LoBat

nLF

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

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

3 Immerse the pH electrode in the first buffer solution.

4 Press the <RUN/ENTER> key.

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

Baud

Time

Day.Month No.

Year

Ident

Tref25

LoBat

nLF

Sal

/pH

mg/l

AutoCal DIN

Tref20

Cal

Lin

AutoCal TEC

AutoCal DIN AutoCal DIN

Tref20

Cal

Lin

AutoCal TEC

mbar

Sal

Store

Auto

ARng

RCL

TDSTDS

Baud

Store

Auto

ARng

RCL

Time

Day.Month No.

Year

Ident

Tref25

LoBat

nLF

Lin

Tref20

Cal

pHpH

OO UpHUpH SalSal

AutoCal TEC

mbarmbar

Auto

ARng

mV/pHmV/pH

mg/lmg/l

S/S/

cmcm

SalSal

1/1/

Store

ARAR

cmcm

RCL

Page 28

Operation pH/Cond 3400i

5 When the measured value is stable, Cd2 appears.

Lin

Tref20

Cal

AutoCal DIN AutoCal TEC

Sal

mbar

Auto

ARng

/pH

mg/l

Store

Sal

RCL

TDS

Baud

Time

Day.Month No.

Year

Ident

Tref25

LoBat

nLF

Note

At this point, the AutoCal DIN calibration can be terminated with <M>. This corresponds to a single-point calibration. When doing so, the in- strument uses the Nernst slope (-59,2 mV/pH at 25 °C) and determines the asymmetry of the electrode.

6 Thoroughly rinse the electrode with deionized water.

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

with <▲> <▼> while keeping the <RUN/ENTER> key de- pressed.

8 Immerse the pH electrode in the second buffer solution.

9 Press the <RUN/ENTER> key.

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

Baud

Time

Day.Month No.

Year

Ident

Tref25

LoBat

nLF

TDSTDS

AutoCal DIN

Tref20

Cal

Lin

AutoCal TEC

Auto

ARng

Store

RCL

Time

Day.Month No.

Year

Tref25

LoBat

nLF

Baud

Ident

Lin

Tref20

Cal

pHpH

OO UpHUpH SalSal

AutoCal DIN AutoCal TEC

mbarmbar

mV/pHmV/pH

1/1/

Auto

ARng

mg/lmg/l

S/S/

Store

ARAR

cmcm

SalSal

RCL

Page 29

pH/Cond 3400i Operation

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

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

No.

Lin

Tref20

Cal

Tref20

Cal

AutoCal DIN AutoCal TEC

Sal

mV/pH

mbar

Auto

ARng

Sal

mbar

Auto

ARng

mg/l

Store

mg/l

Store

Sal

RCL

Sal

RCL

TDS

Baud

Time

Day.Month

Year

Ident

Tref25

LoBat

nLF

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

(mV) appears on the display.

TDS

Baud

Time

Day.Month

Year

Ident

Tref25

LoBat

nLF

12 Switch to the measuring mode with <M>.

Page 30

Operation pH/Cond 3400i

4.3.3 ConCal

Two-point calibration For this procedure, use two buffer solutions:

z pH 7.0 ± 0.5

z any other buffer solution

Note

Skip the steps 2 and 8 if you use a pH electrode with a temperature sensor or the temperature sensor of a conductivity measuring cell.

1 Press the <CAL> key repeatedly until the ASY display and the

Cal function display appears. The sensor symbol displays the evaluation of the last calibration (or no sensor symbol in the delivery state or after the measurement parameter has been reset).

TDS

Baud

Time

Day.Month No.

Year

Ident

Tref20

Tref25

LoBat

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

3 Immerse the pH electrode in the first buffer solution (pH 7.0 ±

4 Press the <RUN/ENTER> key.

5 Set the measured value to the nominal pH value of the buffer

6 When the measured value is stable, press the <RUN/ENTER>

Lin

nLF

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

0.5 in two-point calibration).

The measured pH value appears on the display.

solution (at the current temperature) with <▲> <▼>.

key. The value of the asymmetry appears.

Cal

AutoCal DIN AutoCal TEC

Sal

mV/pH

mbar

Auto

ARng

mg/l

Store

Sal

RCL

7 Press the <RUN/ENTER> key. SLO appears.

Note

At this point, the ConCal calibration can be broken off with <M>. This corresponds to a single-point calibration. When doing so, the instru- ment uses the Nernst slope (-59,2 mV/pH at 25 °C) and the fixed asymmetry of the electrode.

Page 31

pH/Cond 3400i Operation

TDS

Baud

Time

Day.Month No.

Year

Ident

Tref20

Tref25

LoBat

8 Thoroughly rinse the electrode with deionized water.

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

10 Immerse the pH electrode in the second buffer solution.

11 Press the <RUN/ENTER> key.

12 Set the measured value to the nominal pH value of the buffer

Lin

nLF

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

solution (at the current temperature) with <▲> <▼>.

Cal

AutoCal DIN AutoCal TEC

Sal

mV/pH

mbar

Auto

ARng

mg/l

Store

Sal

RCL

13 When the measured value is stable, press the <RUN/ENTER>

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

Lin

Tref20

Cal

AutoCal DIN AutoCal TEC

Sal

mV/pH

mbar

Auto

ARng

mg/l

Store

Sal

RCL

TDS

Baud

Time

Day.Month

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

No.

Year

Ident

Tref25

LoBat

nLF

(mV) appears on the display.

Page 32

Operation pH/Cond 3400i

Lin

Tref20

Cal

AutoCal DIN AutoCal TEC

Sal

mbar

Auto

ARng

mg/l

Store

Sal

RCL

TDS

Baud

Time

Day.Month

No.

Year

Ident

Tref25

LoBat

nLF

15 Switch to the measuring mode with <M>.

Page 33

pH/Cond 3400i Operation

4.4 Conductivity/Salinity

4.4.1 General information

Note

Conductivity measurements with the pH/Cond 340 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.

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

1 Connect a conductivity measuring cell to the measuring instru-

ment. The instrument automatically switches over to conductivity measurement (status display or SAL). If the conductivity measuring cell is already connected, press the <M> key repeatedly until the status display or SAL ap- pears.

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

measuring instrument with the measuring cell (see section 4.4.5).

3 Using <▲ > <▼>, 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.

Temperature

compensation

Reference temperature,

Tref

Selectable linear or nonlinear temperature compensation, can be switched off (see section 4.8 C

ONFIGURATION).

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.

WITCHING OVER THE REFERENCE TEMPERA-

Page 34

Operation pH/Cond 3400i

Checking the cell con-

stant

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

display.

TDS

Baud

Time

Day.Month No.

Year

Ident

Tref20

Tref25

LoBat

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

Lin

nLF

cell constant is displayed, e. g. 0.472 cm

TDS

Baud

Time

Day.Month No.

Year

Ident

Tref20

Tref25

LoBat

nLF

Lin

AutoCal DIN

Cal

AutoCal DIN

Cal

OUpH Sal

AutoCal TEC

OUpH

AutoCal TEC

mV/pH

mbar

Auto

ARng

Sal

mV/pH

mbar

Auto

ARng

mg/l

Store

mg/l

Store

Sal

RCL

Sal

RCL

-1

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 4.4.5 D

IN THE CONTROL STANDARD).

ETERMINING THE CELL CONSTANT (CALIBRATION

Page 35

pH/Cond 3400i Operation

4.4.2 Measuring the conductivity

You can meaure the conductivity as follows:

1 Perform the preparatory activities according to section 4.4.1.

2 Immerse the conductivity measuring cell in the test sample.

3 Press the < ▲> <▼> keys until and the unit µS/cm appears

in the status display. The conductivity value appears on the display.

TDS

Baud

Time

Day.Month No.

Year

Ident

Tref25

LoBat

nLF

4.4.3 Measuring the salinity

You can measure the salinity as follows:

1 Perform the preparatory activities according to section 4.4.1.

2 Immerse the conductivity measuring cell in the test sample.

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

The salinity value appears on the display.

Lin

Tref20

Cal

AutoCal DIN AutoCal TEC

OUpH

Sal

mV/pH

mbar

Auto

ARng

mg/l

Store

Sal

RCL

TDS

Time

Day.Month No.

Year

Tref25

LoBat

nLF

Baud

Ident

Lin

Tref20

Cal

OUpH

AutoCal DIN AutoCal TEC

Sal

mV/pH

mbar

Auto

ARng

mg/l

Store

Sal

RCL

Page 36

Operation pH/Cond 3400i

4.4.4 AutoRead AR (drift control)

The AutoRead function (drift control) checks the stability of the measurement signal. The stability has a considerable effect on the reproducibility of the measured value.

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

<▼>.

2 Immerse the conductivity measuring cell in the test sample.

3 Activate the AutoRead function with <AR>. The current mea-

sured 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.

TDS

Baud

Time

Day.Month No.

Year

Ident

Tref25

LoBat

nLF

5 If necessary, start the next AutoRead measurement with

<RUN/ENTER>.

6 To terminate AutoRead: Press the <AR> 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.

Lin

Tref20

Cal

AutoCal DIN AutoCal TEC

OUpH

Sal

mV/pH

mbar

Auto

ARng

mg/l

Store

Sal

RCL

Page 37

pH/Cond 3400i Operation

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

Why determine the cell

constant?

AutoRead The calibration procedure automatically activates the AutoRead func-

Displaying 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 instruments is set to 0.475 cm

-1

(TetraCon 325 conductivity measuring cell).

tion. The AR 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 51.

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

Sample printout:

CALIBRATION PROTOCOL

14.04.01 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 : +++

Page 38

Operation pH/Cond 3400i

Calibration evaluation After the calibration, the measuring instrument automatically evaluates

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

Determining the cell

constant

Display Cell constant [cm

0.450 ... 0.500 cm

Eliminate the error according to chapter 6 W

HAT TO DO IF...

Outside the range

0.450 ... 0.500 cm

-1

]

-1

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

1 Press the <CAL> key repeatedly until the and CELL status

displays appear.

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.

TDSTDS

OO UpHUpH SalSal

mV/pHmV/pH

Baud

Time

Day.Month No.

Year

Ident

Tref25

LoBat

nLF

Lin

Tref20

Cal

AutoCal DIN AutoCal TEC

ARng

Store

RCL

Time

Day.Month No.

Year

Tref25

LoBat

nLF

Baud

Ident

Lin

0077

Tref20

Cal

AutoCal DIN AutoCal TEC

mg/lmg/l

S/S/

cmcm

mbarmbar

SalSal

cmcm

1/1/

°°

Store

AutoAuto

ARng

RCL

3 Immerse the conductivity measuring cell in the control standard

solution, 0.01 mol/l KCI.

Page 39

pH/Cond 3400i Operation

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.

TDS

Baud

Time

Day.Month No.

Year

Ident

Tref25

LoBat

nLF

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

termined cell constant is taken over for the measurement.

Note

If the error message

AutoCal DIN

Tref20

Lin

Cal

AutoCal TEC

Sal

OUpH

mV/pH

mg/l

mbar

Sal

Store

Auto

ARng

RCL

appears, refer to chapter 6 W

E3E3

HAT TO DO IF...

Page 40

Operation pH/Cond 3400i

4.4.6 Setting the temperature compensation

The calculation of the temperature compensation is based on the preset reference temperature, Tref 20 or Tref 25 (see section 4.8 C

You can select one of the following temperature compensations:

z Nonlinear temperature compensation (nLF)

according to EN 27 888

z Linear temperature compensation (Lin) with adjustable coeffi-

cient in the range 0.001 ... 3.000 %

z No temperature compensation (----)

Note

ips Select the following temperature compensations given in the table ac-

cording to the respective test sample:

ONFIGURATION).

Application tips

Test sample Temperature compensation Display in-

dicator

Natural water (ground water, surface water and drinking water)

Ultrapure water nLF

4.6 Saving

The measuring instrument has an internal data memory. It can store up to 500 data records. A complete data record consists of:

z Number of the storage location

z Date/time

z Measured values of the probes connected

z Temperature

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 47).

4.6.1 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.

TDS

Baud

Time

Day.Month

No.

Year

Ident

Tref20

Tref25

LoBat

2 Confirm with <RUN/ENTER>.

Lin

nLF

The display switches to entering the ID number.

AutoCal DIN

Cal

AutoCal TEC

Sal

mV/pH

mbar

Auto

ARng

mg/l

Store

Sal

RCL

Page 46

Operation pH/Cond 3400i

Message StoFull

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

StoFullStoFull

TDS

Baud

Time

Day.Month

pied.

You have the following options:

No.

Year

Ident

Tref20

Tref25

LoBat

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

4 Confirm with <RUN/ENTER>.

Lin

nLF

(1 ... 999).

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

Cal

AutoCal DIN AutoCal TEC

Sal

mV/pH

mbar

Auto

ARng

mg/l

Store

Sal

RCL

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

Returning to the measuring mode without saving press any key

Outputting the data storage see

Clearing the memory see

Press

section 4.6.3

section 4.6.4

Page 47

pH/Cond 3400i Operation

4.6.2 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.

Setting the

save interval

The default setting for the save interval (Int 1) is OFF. By this, the AutoStore function is switched off. To switch the function on, 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 <STO> key. Int 1 appears on the display.

TDS

Baud

Time

Day.Month No.

Year

Ident

Tref25

LoBat

nLF

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).

Lin

Tref20

Cal

AutoCal DIN AutoCal TEC

OUpH

Sal

mV/pH

mbar

Auto

ARng

mg/l

Store

Sal

RCL

4 Confirm with <RUN/ENTER>.

The number of free memory locations appears on the display.

TDS

Baud

Time

Day.Month No.

Year

Ident

Tref25

LoBat

nLF

5 Confirm with <RUN/ENTER>.

The prompt for the ID number appears on the display.

Lin

Tref20

Cal

AutoCal DIN AutoCal TEC

OUpH

Sal

mV/pH

mbar

Auto

ARng

mg/l

Store

Sal

RCL

Page 48

Operation pH/Cond 3400i

TDS

Baud

Time

Day.Month No.

Year

Ident

Tref25

LoBat

nLF

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

7 Confirm with <RUN/ENTER>.

The measuring instrument switches to the last active measuring mode and starts the measuring and saving procedure. AutoStore 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 49) and

Lin

Tref20

Cal

AutoCal DIN AutoCal TEC

OUpH

Sal

mV/pH

mbar

Auto

ARng

mg/l

Store

Sal

RCL

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 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.

Page 49

pH/Cond 3400i Operation

4.6.3 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 to the interface

Outputting stored data

on the display

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

display.

ISE

UpH

°F °C

CalError

ARng

Sal

mV/pH

mbar

Auto

ARng

mol/L mV/pH % ppm

mg/L

TempError

mg/l

Sal

Store

RCL

Baud

Time

Day.Month

LoBat

2 Press the <RUN/ENTER> key.

No.

Year

Ident

AutoCal DIN

AutoCal TEC

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.

TDS

Auto

ConCal

Store

Time

Year

LoBat

Baud

No.Day.Month

Ident

Tref25 nLF

Tref20

Lin

Cal

AutoCal DIN

AutoCal TEC

You can perform the following activities:

Display further data of the data record (ID number, date, time, storage location)

Toggle between two saved measured variables

Advance one data record (storage location)

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

Press <RUN/ENTER>

+ <M>

Press <▲>

Page 50

Operation pH/Cond 3400i

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).

2Press <▲> 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.

ISE

UpH

°F

°C

CalError

ARng

mol/L mV/pH % ppm

mg/L

TempError

RCL

Baud

Time

No.

Day.Month

Year

Ident

AutoCal DIN

LoBat

AutoCal TEC

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.

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

Auto

ConCal

Store

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

Page 51

pH/Cond 3400i Operation

Sample printout:

No. 1:

09.03.99 17:10 pH 10.01 25 °C Tman AR Ident : 1

No. 2:

09.03.99 17:11 pH 10.01 24.7 °C Tauto AR Ident : 1

No. 3:

09.03.99 17:12

305.2 mV Tauto Ident : 13

...

Outputting the

calibration data

on the display

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

display.

TDS

Baud

Time

Day.Month No.

Year

Ident

Tref25

LoBat

nLF

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 Cond: Cell constant C

Information concerning the calibration procedure is output as well.

Lin

Tref20

Cal

AutoCal DIN AutoCal TEC

OUpH

Sal

mV/pH

mbar

Auto

ARng

mg/l

Store

Sal

RCL

Page 52

Operation pH/Cond 3400i

Lin

Tref20

Cal

Tref20

Cal

AutoCal DIN AutoCal TEC

Sal

mV/pH

mbar

Auto

ARng

Sal

mbar

Auto

ARng

mg/l

Store

mg/l

Store

Sal

RCL

Sal

RCL

TDS

Baud

Time

Day.Month

No.

Year

Ident

Tref25

LoBat

nLF

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

(mV).

TDS

Baud

Time

Day.Month

Year

LoBat

No.

Ident

Tref25 nLF

4 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 initialized (see section 4.9 R

TDS

Baud

Time

Day.Month No.

Year

Ident

Tref25

LoBat

nLF

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

mode.

AutoCal DIN

Tref20

Lin

Cal

AutoCal TEC

OUpH

Sal

mV/pH

mbar

Auto

ARng

mg/l

Store

Sal

RCL

ESET).

Page 53

pH/Cond 3400i Operation

Outputting the calibra-

tion protocol on the

interface

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

display.

TDS

Sal

OUpH

mV/pH

Baud

Time

Day.Month No.

Year

Ident

Tref25

LoBat

nLF

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:

Lin

Tref20

Cal

AutoCal DIN AutoCal TEC

mbar

Auto

ARng

mg/l

Store

Sal

RCL

CALIBRATION PROTOCOL

02.03.01 14:19 Device No.: 12345678

Calibration pH Cal time: 01.10.01 / 15:20 Cal interval: 7d AutoCal TEC Tauto Buffer 1 2.00 Buffer 2 4.01 Buffer 3 7.00 * Buffer 4 10.00 C1 174.1 mV 25.0°C C2 -133.3 mV 25.0°C S1 -59.4 mV/pH ASY1 - 4 mV Probe: +++

Calibration Conductivity Cal time: 14.12.00 / 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 : +++ CALIBRATION ISE Cal time: 01.10.01 / 15:30 Std 1 10,00 mg/l

Page 54

Operation pH/Cond 3400i

4.6.4 Clearing the memory

With this function, you can delete 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.

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

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

Note

The calibration data remain stored and can be called up.

Page 55

pH/Cond 3400i Operation

4.7 Transmitting data

You have the following possibilities of transmitting data:

z One of the following options:

– With the AutoStore function (page 47), measured values are

periodically saved internally (save interval Int 1) and output on the interface.

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

values are periodically output on the interface (see below).

z With the Output data storage function (page 49), calibration data or

saved measured values are output on the interface.

4.7.1 Data transmission interval (Int 2)

The interval to 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.

Setting the

Data transmission

interval

Note

The setting of the interval (Int 2) is only effective if the save interval (AutoStore function) is switched off!

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.

TDS

Baud

Time

Day.Month No.

Year

Ident

Tref25

LoBat

nLF

Lin

Tref20

Cal

AutoCal DIN

AutoCal TEC

OUpH

Sal

mV/pH

mbar

Auto

ARng

mg/l

Store

Sal

RCL

3 Set the required interval between the saving procedures with

<▲> <▼>.

Page 56

Operation pH/Cond 3400i

CTS

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).

4.7.2 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 instruments. The data output automatically switches to the RS232 interface.

Socket assignment

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 on the PC/printer:

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

Handshake RTS/CTS + Xon/Xoff

Parity none

Data bits 8

Stop bits 2

Cable length Max. 15 m

1 2 RxD

RS 232

REC

3 Ground 4TxD

Page 57

pH/Cond 3400i Operation

4.7.3 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.

Note

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

Page 58

Operation pH/Cond 3400i

4.8 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

Display during the pH calibration

Intervals Calibration (Int 3) in days (d)

Reference temperature – 25 °C (TREF25)t25

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.

Buffer nominal value, or current electrode voltage

– pH: 1 ... 7 ... 999 d Int 3

– : 1 ... 180 ... 999 d Int 5

– 20 °C (TREF20)t20

Baudrate

TDS

Baud

Time Day.Month No.

Year

Ident

Tref25

LoBat

nLF

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

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

play.

Lin

Tref20

Cal

AutoCal DIN AutoCal TEC

OUpH

Sal

mV/pH

mbar

Auto

ARng

mg/l

Store

Sal

RCL

Page 59

pH/Cond 3400i Operation

Calibration

intervals pH

TDS

Baud

Time

Day.Month No.

Year

Ident

Tref20

Tref25

LoBat

6 Select the required display during the pH calibration with

7 Confirm with <RUN/ENTER>. On the display, Int 3 appears.

Lin

nLF

<▲> <▼>.

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

TDS

Baud

Time

Day.Month No.

Year

Ident

Tref20

Tref25

LoBat

nLF

Lin

AutoCal DIN

Cal

AutoCal DIN

Cal

AutoCal TEC

Sal

mV/pH

mbar

Auto

ARng

Sal

mV/pH

mbar

Auto

ARng

/pH

mg/l

Store

mg/l

Store

Sal

RCL

Sal

RCL

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

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

appears on the display.

TDS

Baud

Time

Day.Month No.

Year

Ident

Tref20

Tref25

LoBat

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

nLF

Lin

UpH Sal

mbar

Cal

AutoCal DIN

AutoCal TEC

mV/pH

mg/l

Store

Auto

ARng

Sal

RCL

Page 60

Operation pH/Cond 3400i

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

for conductivity measurements appears on the display.

Switching over the

reference temperature

Date and time

TDS

UpH

Baud

Time

Day.Month No.

Year

Ident

Tref25

LoBat

nLF

12 Using <▲> <▼>, toggle between t20 and t25.

13 Confirm with <RUN/ENTER>.

The date flashes on the display.

TDS

Lin

Tref20

Cal

AutoCal DIN AutoCal TEC

Baud

Time

Year

LoBat

No.

Ident

Tref25 nLF

Lin

Tref20

Cal

AutoCal DIN AutoCal TEC

Day.Month

OUpH

SalO

mV/pH

mbar

Auto

ARng

Sal

mV/pH

mbar

Auto

ARng

mg/l

Store

mg/l

Store

Sal

RCL

Sal

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

15 Confirm with <RUN/ENTER>.

The date (month) flashes on the display.

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

17 Confirm with <RUN/ENTER>.

The year appears on the display.

18 Set the current year with <▲> <▼>.

19 Confirm with <RUN/ENTER>.

The hours flash on the display.

20 Set the current time with <▲> <▼>.

Page 61

pH/Cond 3400i Operation

21 Confirm with <RUN/ENTER>.

The minutes flash on the display.

22 Set the current time with <▲> <▼>.

23 Confirm with <RUN/ENTER>.

The measuring instrument switches to the last active measuring mode.

Page 62

Operation pH/Cond 3400i

4.9 Reset

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

Measurement

parameters

Cond

The following measuring parameters are reset to the delivery status:

Measuring mode pH

Slope -59.16 mV/pH

Asymmetry 0 mV

Manual temperature input 25 °C

Measuring mode

-1

Cell constant 0.475 cm

0.475 cm

(calibrated)

-1

(set up)

Temperature compensation nLF

Reference temperature

Temperature coefficient of the lin-

2.000 %/K

ear temperature compensation

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 (automatic save) OFF

Interval 2 (for data transmission) OFF

Page 63

pH/Cond 3400i 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.

TDS

Baud

Time

Day.Month No.

Year

Ident

Tref20

Tref25

LoBat

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

4 Confirm with <RUN/ENTER>.

Lin

nLF

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

The measuring instrument switches to the setting to reset the Cond measuring parameters.

Cal

AutoCal DIN AutoCal TEC

Sal

mV/pH

mbar

Auto

ARng

mg/l

Store

Sal

RCL

TDS

Baud

Time

Day.Month No.

Year

Ident

Tref20

Tref25

LoBat

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

6 Confirm with <RUN/ENTER>.

Lin

nLF

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

The measuring instrument switches to the configuration parameters.

Cal

OpH

AutoCal DIN AutoCal TEC

Sal

mV/pH

mbar

Auto

ARng

mg/l

Store

Sal

RCL

Page 64

Operation pH/Cond 3400i

Resetting the

configuration parame-

ters

TDS

Baud

Time

Day.Month No.

Year

Ident

Tref20

Tref25

LoBat

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

8 Confirm with <RUN/ENTER>.

Lin

nLF

YES: Resetting the configuration parameters no: Retaining settings.

The measuring instrument automatically switches to the last active measuring mode.

Cal

OpH

AutoCal DIN AutoCal TEC

Sal

mV/pH

mbar

Auto

ARng

mg/l

Store

Sal

RCL

Page 65

pH/Cond 3400i Maintenance, cleaning, disposal

5 Maintenance, cleaning, disposal

5.1 Maintenance

The measuring instrument is almost maintenance-free.

The only maintenance task is replacing the batteries.

LoBat on the display indicates that the batteries should be changed.

The batteries are then largely depleted.

Replacing the batteries

1 Open the housing after the instrument has been switched off:

– Undo the four screws on the underside of the instrument

– Pull down the lower cover (1).

2 If necessary, take the four depleted batteries (2) out of the bat-

tery compartment.

3 Place four new batteries (type Mignon AA) in the battery com-

partment.

4 Close the lower cover (1).

Warning

Make sure that the poles of the batteries are the right way round.

The

± signs on the batteries must correspond to the ± signs in the bat-

tery compartment. Only use leakproof alkaline manganese batteries.

Page 66

Maintenance, cleaning, disposal pH/Cond 3400i

Note

For maintenance of electrodes and measuring cells, follow the corresponding operating manual.

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 is made of a synthetic material (ABS). 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 instrument against damage during transport.

Batteries This note refers to the battery regulation that applies in the Federal Re-

public of Germany. We would ask end-consumers in other countries to follow their local statutory provisions.

Note

This instrument contains batteries. Batteries that have been removed must only be disposed of at the recycling facility set up for this purpose or via the retail outlet. It is illegal to dispose of them in household refuse.

Measuring instrument Dispose of the measuring instrument as electronic waste at an appro-

priate collection point. It is illegal to dispose of the instrument in household refuse.

Page 67

pH/Cond 3400i 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

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 out of date – Replenish electrolyte or

replace electrode

– Electrode worn out – 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

Page 68

What to do if... pH/Cond 3400i

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 test samples

sample too high

– Measurement procedure not

suitable

– Follow special procedure

Page 69

pH/Cond 3400i What to do if...

6.2 Conductivity system messages

Error message OFL

Error message E3

OFL

OFLOFL

E3E3

Cause Remedy

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

Display LoBat

Instrument does not

react

to keystroke

Display to

toto

– Unsuitable calibration

– Check calibration solutions

solution

6.3 General errors

Cause Remedy

– Batteries almost empty – Exchange the batteries (see

section 5.1 M

Cause Remedy

– Operating condition undefined

or EMC load unallowed

– Processor reset:

Switch the instrument on while pressing the <CAL> key

Cause Remedy

AINTENANCE)

Probe symbol flashes

– Time-out of the interface – Check the instrument that is

connected

Cause Remedy

– Calibration interval expired – Recalibrate the measuring

system

Page 70

What to do if... pH/Cond 3400i

Message StoFull

StoFull

StoFullStoFull

Cause Remedy

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

data storage

Page 71

pH/Cond 3400i Technical data

7 Technical data

Dimensions and weight

Length [mm] 172

Width [mm] 80

Height [mm] 37

Weight [kg] Approx. 0.3

Mechanical structure

Electrical safety

Ambient

conditions

pH/ORP measuring

ranges

Precision of pH/ORP

(± 1 digit)

Type of protection IP 66

Protective class III

Storage - 25 °C ... + 65 °C

Operation -10 °C ... + 55 °C

Climatic class 2

Measuring range Resolution

pH - 2.00 ... + 19.99 0.01

U [mV] - 1999 ... + 1999 1

T [°C] - 5.0 ... + 105.0 0.1

pH (after calibration) ± 0.01

U [mV] ± 1

pH temperature input:

T [°C] ± 0.1

- 20 °C ... + 130 °C

Page 72

Technical data pH/Cond 3400i

Cond measuring ranges

Measuring range Resolution

Precision of

Cond (± 1 digit)

[µS/cm]

[mS/cm]

SAL 0.0 ... 70.0 accord-

0 ... 1999

0.00 ... 19.99

0.0 ... 199.9 0 ... 500

0.01

0.1 1

0.1

ing to the IOT table

T [°C] − 5.0 ... + 105.0 0.1

No compensation:

Accuracy ± 0.5 %

Nonlinear compensation : Accuracy Sample temperature ± 0.5 % 0 °C ... 35 °C

according to EN 27 888;

± 0.5 % 35 °C ... 50 °C

extended nLF function acc. to WTW measurements

Cell constant,

calibration

Cond reference temper-

ature

Linear compensation : Accuracy Sample temperature ± 0.5 % 10 °C ... 75 °C (The accuracy percentage always refers to the measured value.)

SAL Range 0.0 ... 42.0

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

Page 73

pH/Cond 3400i Technical data

Serial

interface

Type RS232, data output

Baud rate Selectable 1200, 2400, 4800, 9600 baud

Data bits 8

Stop bit 2

Parity None

Handshake RTS/CTS + Xon/Xoff

Cable length Max. 15m

Power supply

Batteries 4 x 1.5 V alkali-manganese batteries, type

Operational life Approx. 3000 operating hours

Mains (optional) The following specifications apply to all

plug-in power supplies: Max. overvoltage connection category II

Plug-in power supply unit (Euro, US , UK, Australian plug) FRIWO FW7555M/09, 15.1432 Friwo Part. No. 1822089 Input: 100 ... 240 V ~ / 50 ... 60 Hz / 400 mA Output: 9 V = / 1,5 A

Plug-in power supply with Euro plug: FRIWO FW1199, 11.7864 Friwo Part. No. 1762613 Input: 230 V ~ / 50 Hz / 5.6 VA Output: 12 V = / 130 mA / 1.56 VA

Plug-in power supply with US plug: FRIWO FW1199, 11.7880 Friwo Part. No. 1794043 Input: 120 V ~ / 60 Hz / 6 VA Output: 12 V = / 150 mA

Plug-in power supply with UK plug: FRIWO FW1199, 11.7872 Friwo Part No. 1816491 Input: 230V ~ / 50 Hz / 5.6 VA Output: 12 V = / 130 mA / 1.56 VA

Page 74

Technical data pH/Cond 3400i

Guidelines

and norms used

EMC E.C. guideline 89/336/EEC

EN 61326-1:1997 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

Climatic class VDI/VDE 3540

Type of protection EN 60529:1991

FCC Class A Equipment Statement

Note: This equipment has been tested and found to comply with

the limits for a Class A digital device, pursuant to Part 15 of the

FCC Rules. These limits are designed to provide reasonable

protection against harmful interference when the equipment is

operated in a commercial environment. This equipment

generates, uses, and can radiate radio frequency energy and, if

not installed and used in accordance with the instruction manual,

may cause harmful interference to radio communications.

Operation of this equipment in a residential area is likely to cause

harmful interference in which case the user will be required to

correct the interference at his own expense.

Test certificates

cETLus, CE

Page 75

pH/Cond 3400i 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 will help you to find the topics that you are looking for.

Page 76

Lists pH/Cond 3400i

Abbreviations

Conductivity value (international γ)

AR AutoRead (drift control)

ARng Automatic range switching

Measuring instrument measures with highest resolution

ASY Asymmetry

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

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

Lin Linear temperature compensation

LoBat Batteries almost empty(Low Battery)

mV Voltage unit

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

nLF Nonlinear temperature compensation

OFL Display range exceeded (Overflow)

pH pH value

S Slope (internat. k)

SAL Salinity

Page 77

pH/Cond 3400i Lists

SELV Safety Extra Low Voltage

SLO Slope setting on calibration

TC Temperature coefficient (internat. α)

TP Temperature measurement active (Temperature

Probe)

20/T20 Reference temperature of 20 °C

Ref

25/T25 Reference temperature of 25 °C

Ref

ASY

Asymmetry

Page 78

Lists pH/Cond 3400i

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.

Conductometry Name of the conductivity measuring technique.

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).

Page 79

pH/Cond 3400i Lists

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

e. g. measuring instrument and probe. 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 cal-

ibration 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.

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).

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 hy-

drogen 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 elec-

trical current remains constant.

Reference

temperature

Fixed temperature value to compare temperature-dependent mea-

sured 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 seawater corresponds to the relationship

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 deter-

mined by measuring the electrical conductivity.

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

Slope The slope of a linear calibration function.

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

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

Page 80

Lists pH/Cond 3400i

Temperature

Value of the slope of a linear temperature function.

coefficient

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 conductometric 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.

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

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

Test 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.

Page 81

pH/Cond 3400i Index

Asymmetry 21 Auslieferzustand 62 Authorized use 11 AutoCal DIN 21, 27 AutoCal TEC 21, 23 AutoRead 18, 36

Calibration

Conductivity

Calibration evaluation 22, 38 Calibration interval 44 Calibration procedures 21 Calibration protocol 21

D. O. 37 Cell constant 34, 37 ConCal 21, 30 Conductivity 35 Connecting a printer 56 Connecting the original plugin power supply unit

Data record 45 Data transmission (interval)

Display 9 Displaying calibration data

Drift control 18, 36

Energy saving feature 15 Error messages 69

Initial commissioning 13 Initialization 62 Interval

calibration

data transmission 55

save 47

Kalibrieren 37

Keys 8

Linear

Temperature compensa-

tion

temperature compensa-

tion

Measuring 33 Measuring mode when switching on

Nonlinear

Temperature compensa-

tion

temperature compensa-

tion

Operating 10 Operating safety 12 ORP electrode 20 ORP voltage 20

Printing

calibration protocol

Reference temperature (conductivity) Remote control 57 Replacing the batteries 65 Reset 62 Resetting the measuring parameters RS232 interface 56

Safety 11 safety precautions 11

Salinity 35 Save interval 47 Scope of delivery 13 Setting the baud rate 58 Setting the date 13, 60 Setting the reference temperature

Setting the time 13, 60 single-point calibration 21 Single-point calibration (pH)

21, 25, 28, 30

Slope 21

Temperature compensation

40, 43

linear 40 nonlinear 40

Temperature compensation (conductivity) Temperature sensor

Conductivity pH 17

Two-point calibration

ConCal

two-point calibration 21 Two-point calibration (pH)

21, 25, 28, 30

Page 82

Index pH/Cond 3400i

Page 83

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-3400i User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

1Overview

1.1 General features

1.2 SETs of equipment

1.3 Keypad

1.4 Display

1.5 Jack field

1.6 Operating structure

2 Safety

2.1 Authorized use

2.2 General safety instructions

3 Commissioning

3.1 Scope of delivery

3.2 Initial commissioning

4 Operation

4.1 Switching on the measuring instrument

4.2 pH value / ORP voltage

4.2.1 General information

4.2.2 Measuring the pH value

4.2.3 Measuring the ORP voltage

4.3 pH calibration

4.3.1 AutoCal TEC

4.3.2 AutoCal DIN

4.3.3 ConCal

4.4 Conductivity/Salinity

4.4.1 General information

4.4.2 Measuring the conductivity

4.4.3 Measuring the salinity

4.4.4 AutoRead AR (drift control)

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

4.4.6 Setting the temperature compensation

4.6 Saving

4.6.1 Saving manually

4.6.2 Switching on AutoStore (Int 1)

4.6.3 Outputting the data storage

4.6.4 Clearing the memory

4.7 Transmitting data

4.7.1 Data transmission interval (Int 2)

4.7.3 Remote control

4.8 Configuration

4.9 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 Conductivity system messages

6.3 General errors

7 Technical data

8Lists