Xylem pH-ION 3400i User Manual

pH/ION 3400i

Operating manual

°C

pH/Ion meter

ba75685e01 01/2007

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.

pH/ION 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 . . . . . . . . . . . . . . . . . . 17

4.2.3 Measuring the ORP voltage . . . . . . . . . . . . . . . 19

4.3 pH calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

4.3.1 AutoCal TEC . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

4.3.2 AutoCal DIN . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

4.3.3 ConCal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

4.4 Ion concentration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

4.4.1 General information . . . . . . . . . . . . . . . . . . . . . . 32

4.4.2 Measuring the ion concentration . . . . . . . . . . . . 33

4.4.3 Calibration for ion selective measurements . . . 34

4.5 Calibration interval (Int 3) . . . . . . . . . . . . . . . . . . . . . . . 41

4.6 Saving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

4.6.1 Saving manually . . . . . . . . . . . . . . . . . . . . . . . . 42

4.6.2 Switching on AutoStore (Int 1) . . . . . . . . . . . . . 44

4.6.3 Outputting the data storage . . . . . . . . . . . . . . . . 46

4.6.4 Clearing the memory . . . . . . . . . . . . . . . . . . . . . 52

4.7 Transmitting data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

4.7.1 Data transmission interval (Int 2) . . . . . . . . . . . 53

4.7.2 PC/external printer (RS232 interface) . . . . . . . . 54

4.7.3 Remote control . . . . . . . . . . . . . . . . . . . . . . . . . 55

4.8 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

4.9 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

5 Maintenance, cleaning, disposal. . . . . . . . . . . . . . . . . 63

5.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

Contents pH/ION 3400i

5.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

5.3 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

6 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

6.1 pH system messages . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

6.2 ISE system messages . . . . . . . . . . . . . . . . . . . . . . . . . . 67

6.3 General errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

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

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

pH/ION 3400i Overview

1Overview

1.1 General features

This compact precision handheld meter enables you to carry out pH / ORP measurements and concentration measurements using ion selective electrodes 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 and the special AutoRead

function support you in your work with the handheld meter.

°C

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.

Overview pH/ION 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.

pH/ION 3400i Overview

Set (sample configuration):

1 pH/ION 3400i measuring instrument

2 Stand

3 Measuring beaker,50 ml

4 50 ml pH buffer solution, STP 4

5 50 ml pH buffer solution, STP 7

6 Storing solution for pH electrodes

7 pH combination electrode

8 Plug-in power supply (optional)

Overview pH/ION 3400i

1.3 Keypad

STOM

ARRCLCAL

RUN/ENTER

Key functions

STO

CAL

RCL

Select the measured variable <M>:

– pH value / ORP voltage

– Ion concentration

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

pH/ION 3400i Overview

1.4 Display

Status display

ISE

UpH

Baud

Time

Day.Month No.

Year

Ident

AutoCal DIN

LoBat

AutoCal TEC

1.5 Jack field

Auto

ConCal

Store

°F °C

CalError

ARng

mol/L mV/pH % ppm

mg/l

Tem pEr ro r

RCL

Probe symbol

Meas. value display

Function and temperature display

5 4

123

1 pH electrode or ISE (combination) electrode

2 Reference electrode

3 Plug-in power supply (optional)

4 pH temperature sensor

5 Serial interface RS 232 / analog output (recorder)

Overview pH/ION 3400i

1.6 Operating structure

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

pH/ 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 ion concentration 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

Safety pH/ 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.

pH/ 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 <▲> <▼>.

Commissioning pH/ 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.

pH/ 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.

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).

Operation pH/ 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.

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.

Temperature sensor You can measure with or without a temperature sensor. If a tempera-

ture sensor is connected, it is indicated on the display by TP.

Note

The measuring instrument automatically recognizes the type of the temperature sensor used. Therefore, you can connect temperature sensors of the NTC30 or Pt1000 type.

The temperature measurement is absolutely essential for a reproducible pH measurement. If the measurement is made without a temperature sensor, proceed as follows:

1 Measure the current temperature of the test sample using a

thermometer.

2 Enter the temperature on the instrument: While pressing the

<RUN/ENTER> key, enter the temperature value of the test sample with <▲ > <▼>.

pH/ 3400i Operation

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 If required, enter the temperature of the test sample with <▲>

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

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

The pH value appears on the display.

ISE

°F °C

CalError

ARng

mol/L mV/pH % ppm

mg/L

TempError

RCL

Time

Day.Month No.

Year

AutoCal DIN

LoBat

AutoCal TEC

Baud

Ident

Auto

ConCal

Store

Setting the resolution

AutoRead AR

(drift control)

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

2 Press the <M> key. The measured values are displayed with a

high resolution, e.g. pH = 4.012.

3 Press the <RUN/ENTER> and <M> key once more.

The measured values are displayed with a low resolution, e.g. pH = 4.01.

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).

Operation pH/ 3400i

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>.

pH/ 3400i Operation

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.

ISE

Baud

Time

Day.Month No.

Year

Ident

AutoCal DIN

LoBat

AutoCal TEC

Note

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

Auto

ConCal

Store

CalError

ARng

mol/L mV/pH

mV % ppm

mg/L

°F

°C

TempError

RCL

Operation pH/ 3400i

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 (-59,16 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 48.

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 51).

pH/ 3400i Operation

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

Operation pH/ 3400i

Preparatory activities

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 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.

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).

pH/ 3400i Operation

Lin

Tref20

Cal

Auto

ConCal

AutoCal DIN

AutoCal TEC

Store

Sal

mbar

Auto

ARng

°F °C

CalError

ARng

/pH

mg/l

Store

mol/L mV/pH

mV % ppm

mg/L

TempError

Sal

RCL

Baud

Time

Day.Month No.

Year

Ident

AutoCal DIN

LoBat

AutoCal TEC

ISE

Auto

ConCal

Store

CalError

ARng

mol/L mV

mV/pH % ppm

mg/L

°F

°C

TempError

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:

ISE

Baud

Time

Day.Month No.

Year

Ident

AutoCal DIN

LoBat

AutoCal TEC

RCL

5 When the measured value is stable, Ct2 appears.

ISE

°F °C

CalError

ARng

mol/L mV/pH % ppm

mg/L

TempError

RCL

Baud

Time

Day.Month No.

Year

Ident

AutoCal DIN

LoBat

AutoCal TEC

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-

Auto

ConCal

Store

Operation pH/ 3400i

strument uses the Nernst slope (-59,16 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:

ISE

mV/pH

mV % ppm

°F °C

CalError

ARng

°F

°C

CalError

ARng

mol/L

mg/L

TempError

RCL

mol/L mV/pH % ppm

mg/L

TempError

RCL

1 4

Baud

Time

Day.Month No.

Year

Ident

AutoCal DIN AutoCal DIN

LoBat

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.

ISE

Auto

ConCal

Store

Time Day.Month No.

Year

AutoCal DIN

LoBat

AutoCal TEC

Baud

Ident

Auto

ConCal

Store

ISE

Baud

Time

Day.Month No.

Year

Ident

LoBat

AutoCal TECAutoCal TEC

Auto

ConCal

Store

CalError

ARng

mol/L

mV/pH % ppm

mg/L

°F

°C

TempError

RCL

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

(mV) appears on the display.

pH/ 3400i Operation

ISE

CalError

ARng

mol/L mV/pH

mV % ppm

mg/L

°F

°C

TempError

RCL

Baud

Time

Day.Month No.

Year

Ident

AutoCal DIN

LoBat

AutoCal TEC

12 Switch to the measuring mode with <M>.

Auto

ConCal

Store

+ 58 hidden pages