Xylem pHotoFlex, pHotoFlex Turb User Manual

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Operating manual

pHotoFlex /

pHotoFlex Turb

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Handheld photometer

Accuracy when

going to press

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.

Firmware

Method data

Analysis specifications

Operating manual

Part of the process of consequently improving our products is the continuous further development of the range of photometric tests supplied and the meter firmware. All current data for the pHotoFlex /

pHotoFlex Turb can be found on the Internet under http://

www.WTW.com.

You can easily transfer new firmware to your instrument with the aid of the AK 540/B cable and a PC. More detailed information can be found in the appendix of the detailed operating manual on the CD-ROM provided.

Reprinting - even as excerpts - is only allowed with the explicit written authorization of WTW GmbH, Weilheim. Printed in Germany.

pHotoFlex / pHotoFlex Turb Contents

1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1.1 General features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1.2 Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

1.3 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

1.4 Socket field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

1.5 LabStation (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

2.1 Authorized use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

2.2 General safety instructions . . . . . . . . . . . . . . . . . . . . . . . 14

3 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

3.1 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

3.2 Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

3.3 Connecting the LabStation . . . . . . . . . . . . . . . . . . . . . . . 19

3.4 Initial commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

4 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

4.1 Switching on the meter . . . . . . . . . . . . . . . . . . . . . . . . . . 23

4.2 Inserting a cell . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

4.3 General operating principles . . . . . . . . . . . . . . . . . . . . . 27

4.3.1 Operating modes . . . . . . . . . . . . . . . . . . . . . . . . 27

4.3.2 Navigation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

4.3.3 Navigation example 1: Setting the language . . . 30

4.3.4 Navigation example 2: Setting the date and time 31

4.3.5 Menu overview . . . . . . . . . . . . . . . . . . . . . . . . . 33

4.4 System settings (System menu) . . . . . . . . . . . . . . . . . . 35

4.4.1 Measured value memory . . . . . . . . . . . . . . . . . . 36

4.4.2 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

4.4.3 Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

4.4.4 Date/time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

4.5 Photometry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

4.5.1 General information . . . . . . . . . . . . . . . . . . . . . . 40

4.5.2 Settings for photometric measurements . . . . . . 41

4.5.3 Measuring the concentration . . . . . . . . . . . . . . . 42

4.5.4 Blank value (reagent blank value) . . . . . . . . . . . 43

4.5.5 Measuring the absorbance/transmission . . . . . 45

4.5.6 Zero adjustment . . . . . . . . . . . . . . . . . . . . . . . . 46

4.5.7 Programs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

4.5.8 Analysis timer . . . . . . . . . . . . . . . . . . . . . . . . . . 49

4.5.9 Timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

4.5.10 Measuring diluted samples . . . . . . . . . . . . . . . . 50

4.6 pH value / ORP voltage . . . . . . . . . . . . . . . . . . . . . . . . . 51

4.6.1 General information . . . . . . . . . . . . . . . . . . . . . . 51

4.6.2 Measuring the pH value . . . . . . . . . . . . . . . . . . 52

4.6.3 Measuring the ORP voltage . . . . . . . . . . . . . . . 53

4.6.4 Settings for pH and ORP measurements . . . . . 53

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Contents pHotoFlex / pHotoFlex Turb

4.6.5 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

4.6.6 Carrying out the TEC and NIST/DIN calibration

procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

4.7 Turbidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

4.7.1 General information . . . . . . . . . . . . . . . . . . . . . . 62

4.7.2 Aligning and marking a cell . . . . . . . . . . . . . . . . 62

4.7.3 Measuring turbidity . . . . . . . . . . . . . . . . . . . . . . 63

4.7.4 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

4.8 Storing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

4.8.1 Storing measurement datsets . . . . . . . . . . . . . . 69

4.8.2 Filtering measurement datsets . . . . . . . . . . . . . 70

4.8.3 Displaying measurement datsets . . . . . . . . . . . . 71

4.8.4 Downloading the measurement datsets to the RS232

interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

4.8.5 Erasing stored measurement datasets . . . . . . . 72

4.9 Transmitting data (RS 232 interface) . . . . . . . . . . . . . . . 72

4.9.1 Connecting a PC/external printer . . . . . . . . . . . . 72

4.9.2 Configuring the RS232 interface . . . . . . . . . . . . 73

4.9.3 Selecting the output format of datasets . . . . . . . 73

4.9.4 Transmitting data . . . . . . . . . . . . . . . . . . . . . . . . 75

4.10 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

4.10.1 Resetting the system settings . . . . . . . . . . . . . . 76

4.10.2 Resetting the photometer settings . . . . . . . . . . . 77

4.10.3 Resetting the pH settings . . . . . . . . . . . . . . . . . . 77

4.11 Meter information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

4.12 Software update . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

4.13 Administrating user-defined methods . . . . . . . . . . . . . . . 79

4.13.1 Administrating user-defined programs with a

terminal program . . . . . . . . . . . . . . . . . . . . . . . . 80

5 Maintenance, cleaning, disposal . . . . . . . . . . . . . . . . . 83

5.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

5.1.1 Inserting/exchanging the batteries . . . . . . . . . . . 83

5.1.2 Retrofitting the accumulator pack . . . . . . . . . . . 84

5.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

5.2.1 Cleaning the cell shaft . . . . . . . . . . . . . . . . . . . . 85

5.2.2 Cleaning the cells . . . . . . . . . . . . . . . . . . . . . . . 85

5.3 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

6 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

6.1 General errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

6.2 Photometry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

6.3 pH value / ORP voltage . . . . . . . . . . . . . . . . . . . . . . . . . 88

6.4 Turbidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

7 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

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pHotoFlex / pHotoFlex Turb Contents

7.1 General data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

7.1.1 pHotoFlex (Turb) . . . . . . . . . . . . . . . . . . . . . . . . 91

7.1.2 LabStation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

7.2 Photometry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

7.3 pH value / ORP voltage . . . . . . . . . . . . . . . . . . . . . . . . . 94

7.4 Turbidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

8 Accessories, options . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

8.1 WTW accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

8.1.1 Connection cable: . . . . . . . . . . . . . . . . . . . . . . . 95

8.2 Optional extensions of the pHotoFlex (Turb) . . . . . . . . . 97

9 Lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99

10 Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

Appendix: Firmware update . . . . . . . . . . . . . . . . . . . . . . . 107

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Contents pHotoFlex / pHotoFlex Turb

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pHotoFlex / pHotoFlex Turb Overview

1Overview

1.1 General features

The compact pHotoFlex (Turb) handheld precision photometer enables you to carry out the following measurements quickly and reliably:

! Photometric measurements

– Concentration measurements

– Absorbance measurements

– Transmission measurements

! pH measurements

! Turbidity measurements (pHotoFlex Turb).

The pHotoFlex (Turb) handheld meter provides the maximum degree of operating comfort, reliability and measuring certainty for all applications.

The proven MultiCal

calibration procedure supports you when calibrating for pH measurements and the AutoRead function enables precise pH measurements.

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1 Keypad

2 Display

3 Cell shaft

(folded out for a 16 mm cell to be inserted)

4 Socket field

Overview pHotoFlex / pHotoFlex Turb

Note

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

! Application reports

! Primers

! Safety datasheets.

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

1.2 Keypad

Key functions

Select the measuring mode <M> (long keystroke):

– Photometry

– Turbidity

– pH & ORP

Select the measured parameter within a measuring mode <M> (short keystroke):

– pH & ORP: pH, ORP

– Photometry:

Concentration, Absorbance, % Transmission

– Turbidity: no measured parameters selectable

Start calibration (measuring modes, pH & ORP,

Turbidity)

Start zero adjustment or blank value measurement using the Photometry \ Adjustment menu (measuring mode, Photometry)

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pHotoFlex / pHotoFlex Turb Overview

In the Photometry measuring mode: Select a pro-

gram for concentration measurement

<PROG>

Open menus / confirm entries / start measurement

Call up the Configuration menu (all settings are made here)

<MENU>

In the Photometry measuring mode, measured parameter, Concentration

switch over between available citation forms

<FORM>

In the Photometry measuring mode, measured parameter, Concentration

Switch over between available units <UNIT>

Switch the measuring instrument on/off

PRT

Output display contents to RS232 interface (e.g. print)

<PRT>

Open the Store menu <STO>, Quick storing <STO> <STO>

Highlight menu items or selection Set values <▲>, <▼>

Switch to the next higher menu level / cancel input

<ESC>

Note

Keys with an additional number printed on are assigned doubly. This enables to directly enter numbers in special menus. Thus, you can, for example, conveniently enter the date and time via the number keys.

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Overview pHotoFlex / pHotoFlex Turb

1.3 Display

The graphic display shows all information of the current measurement in the measured value display. The illumination enables to read the display even in the darkness.

Example

Photometry \ Concentration

1.29

2: A5/25 MC NH4

16 mm 0.20 - 8.00 mg/l

01.02.05 15:12

mg/l

1.4 Socket field

-N

Measuring mode \ measured parameter

Measured value (with unit)

Program and citation form Diameter of the cell and measuring range Status line with date and time

Identifying the

connectors

12345

1 pH electrode

2 pH temperature sensor

3 Power pack

4 Contacts for operation on the LabStation

5 RS232 serial interface

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pHotoFlex / pHotoFlex Turb Overview

1.5 LabStation (optional)

With the LabStation, which is available as an accessory, you can conveniently use the pHotoFlex (Turb) in the laboratory. Laboratory operation with the LabStation enables the following additional functions: ! With photometric measurements, the zero measurement is retained

even after switching the pHotoFlex (Turb) off and on again

! You can connect a barcode reader for the simplified calling up of

programs

! The LSdata software serves to easily enter user-defined programs

! Line power operation is possible to save the batteries or accumula-

tor pack

! The accumulator pack in the pHotoFlex (Turb) is automatically

charged as soon as the meter is placed in the LabStation.

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LabStation

Fig. 1-1 LabStation

Overview pHotoFlex / pHotoFlex Turb

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pHotoFlex / pHotoFlex Turb Safety

2 Safety

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

Target group The meter 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 the chemicals of photometric test sets.

The personnel responsible for the commissioning, operation and maintenance must have the necessary qualifications for this work. If the personnel do not have the required skills they have to be instructed. Furthermore, it must be ensured that the personnel read and completely understand the present operating manual.

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

ty instructions to indicate various types of danger:

Caution

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.

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Safety pHotoFlex / pHotoFlex Turb

2.1 Authorized use

This meter is authorized exclusively for carrying out the following measurements in the field and laboratory: ! Analysis of substances in water and aqueous solutions

using round cells

! Concentration measurement

! Absorbance and transmission measurement

! Measurement of pH value and ORP

! Turbidity measurement (pHotoFlex Turb only).

The technical specifications as given in chapter 7 T

ECHNICAL DATA must

be observed. Only the operation and running of the meter according to the instructions given in this operating manual is authorized. Any other use is considered to be unauthorized.

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.

Opening the photometer or adjustment, maintenance and repair work must only be performed by specialist personnel authorized by the manufacturer.

The only exceptions to this are the activities described in chapter 5M

AINTENANCE, CLEANING, DISPOSAL. Non-compliance results in the

loss of warranty claims.

Follow the points listed below when operating the photometer: ! Follow the local safety and accident prevention regulations

Function and operating

safety

! Observe the enclosed instructions of reagents and accessories

! Observe the regulations when dealing with dangerous substances

! Follow the operating instructions at the workplace

! Use only original spare parts.

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

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pHotoFlex / pHotoFlex Turb Safety

The smooth functioning and operational safety of the meter can only be guaranteed under the environmental conditions that are specified in chapter 7 T

ECHNICAL DATA.

If the instrument was transported from a cold environment to a warm environment, the formation of condensate can lead to the faulty functioning of the instrument. In this event, wait until the temperature of the instrument reaches room temperature before putting the instrument back into operation.

Safe operation It is the responsibility of the operator to continuously observe the over-

all technical condition (externally recognizable deficits and damage as well as alterations to the operational behavior) of the meter.

If safe operation is no longer possible, the instrument must be taken out of service and secured against inadvertent operation! Safe operation is no longer possible if the meter:

! has been damaged in transport

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

time

! is visibly damaged

Obligations of the

operator

! no longer operates as described in this manual.

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

Caution

Danger of eye damage by visible and invisible LED radiation. In the cell shaft there are light emitting diodes (LED) of the 1M class. Do not look at the radiation using optical instruments. With normal, authorized use there is no hazard.

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

! EEC directives for protective labor legislation

! National protective labor legislation

! Safety regulations

! Safety datasheets of the chemical manufacturers.

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Safety pHotoFlex / pHotoFlex Turb

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pHotoFlex / pHotoFlex Turb Commissioning

3 Commissioning

3.1 Scope of delivery

! Handheld photometer, pHotoFlex Turb or pHotoFlex

! 4 batteries, 1.5 V type AA (in the battery compartment)

! Optional: Accumulator pack and power pack with Euro plug

and exchange plugs for USA, UK, and Australia

! Optional: LabStation

! 1 empty cell 16 mm

! 2 empty cells 28 mm

with label to mark the cell for turbidity measurements

! AMCO

! Microfiber cloth to clean the meter

! Compact operating manual and short operating manual

! CD-ROM with

-Clear turbidity standard (pHotoFlex Turb only)

Charging time of the

accumulator pack

– detailed operating manual

– photometry analysis manual with analysis specifications

– software to program user-defined methods

Note

The optional parts of the scope of delivery are available as accessories (see section 8.1).

3.2 Power supply

You can operate the meter either with batteries, accumulator pack or a power pack. The power pack supplies the meter with low voltage (9 V DC). At the same time, the accumulator pack is charged. The accumulator pack is charged even while the meter is switched off.

The LoBat display indicator appears when the batteries or accumulator pack is nearly discharged.

approx. 36 hours.

Caution

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

TA).

ECHNICAL DA-

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Caution

Commissioning pHotoFlex / pHotoFlex Turb

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

Note

The accumulator pack should not be completely discharged. If you do not operate the instrument for a longer period of time you should charge the accumulator pack every six months.

Automatic switchoff The meter has an automatic switch-off function in order to save the bat-

teries or accumulator pack (see section 4.4).

Display illumination During operation with batteries or accumulator pack the meter automat-

ically switches off the display illumination if no key is pressed for 30 seconds. The illumination is switched on with the next keystroke again. The display illumination can also be switched off completely (see section 4.4.2).

Note

Power pack and accumulator pack are available as an accessory (see section 8.1).

Connecting the power

pack (optional)

1 If necessary, replace the Euro plug (1) on the power pack (2)

by the country-specific plug suitable for your country.

2 Connect the plug (3) to the socket (4) of the photometer.

3 Connect the power pack to an easily accessible power socket.

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pHotoFlex / pHotoFlex Turb Commissioning

3.3 Connecting the LabStation

Note

The LabStation is available as an accessory (see section 8.1).

In order to use the functions of the LabStation for operation in the laboratory, connect the LabStation and place the pHotoFlex (Turb) in the LabStation.

Connecting the LabSta-

tion (optional)

1 If necessary, replace the Euro plug (1) on the power pack (2)

by the country-specific plug suitable for your country.

2 Connect the plug (3) to the socket (4) of the LabStation.

3 Connect a PC, printer or barcode reader to the socket (5) of the

LabStation as necessary.

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Note

When the pHotoFlex (Turb) is operated in the LabStation, a barcode reader can be connected. A barcode reader enables to select program numbers in a simplified manner. Recommended barcode readers can be found in section 8.2. For the interface of your meter, set the same baud rate that is set for the barcode reader (see section 4.4.3). The baud rate of the barcode reader is given in the operating manual of your barcode reader.

Commissioning pHotoFlex / pHotoFlex Turb

4 Connect the power pack to an easily accessible power socket.

5 Place the pHotoFlex (Turb) in the LabStation.

LabStation

6 Connect a pH electrode to the socket on the pHotoFlex (Turb)

through the cut-out (6) as necessary.

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pHotoFlex / pHotoFlex Turb Commissioning

3.4 Initial commissioning

Perform the following activities:

! For

– accumulator operation: insert the accumulator pack (see

section 5.1.2)

– line power operation and charging the accumulator pack: connect

the power pack (see section 3.2)

– operation with LabStation: connect the LabStation and place the

pHotoFlex (Turb) in the LabStation (see section 3.3)

! Switch on the meter (see section 4.1)

! Set the language as necessary (see section 4.3.3)

! Set the date and time as necessary (see section 4.3.4)

Note

When you set the language, date and time according to the mentioned sections of this operating manual you will quickly become familiar with the simple operation of the pHotoFlex (Turb).

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Commissioning pHotoFlex / pHotoFlex Turb

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pHotoFlex / pHotoFlex Turb Operation

4 Operation

4.1 Switching on the meter

Switching on Press the <ON/OFF> key.

For 30 seconds, Start menu appears with a selection of the measuring modes. The measuring mode last selected is highlighted. The status line indicates the meter designation and the version number of the software.

Start

Photometry

Turbidity

pH & ORP

i pHotoFlex V 0.24

After a few seconds, the meter automatically switches to the measuring mode and measured parameter used last. The measured value display appears (here, e.g. measuring mode Pho-

tometry).

Photometry \ Concentration

i Select program with <PROG>

01.02.05 15:12

With <M> (long pressure) change the measuring mode. With <M> (short pressure) toggle between the different measured parameters in the selected measuring mode.

Switching off Press the <ON/OFF> key.

Automatic switchoff The meter has an automatic switchoff function in order to save the bat-

teries or accumulator pack (see section 4.4). The automatic switchoff switches the meter off if no key is pressed for an adjustable period.

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The automatic switchoff is not active

! if the power is supplied by the power pack (optional),

! if the power is supplied by the LabStation (optional),

! if the Timer or Analysis timer function is on.

Operation pHotoFlex / pHotoFlex Turb

Display illumination

with battery and accu-

mulator pack operation

During operation with batteries or accumulator pack the meter automatically switches off the display illumination if no key is pressed for 30 seconds. The illumination is switched on again with the next keystroke.

4.2 Inserting a cell

To be able to insert cells in the pHotoFlex (Turb), the cell shaft has to be prepared to take in a cell.

1 Push the dust cover (1) upward.

The cell shaft for 28 mm cells is open.

! Insert a 28 mm cell (see below)

! Insert a 16 mm cell (see page 25)

Inserting a 28 mm cell

2 Insert the cell so that it is positioned on the bottom of the cell

shaft. The cell is ready to be measured.

3 For turbidity measurement:

Align the cell (see section 4.7.2).

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pHotoFlex / pHotoFlex Turb Operation

Inserting a 16 mm cell

1 Put the fold-out cell shaft (2) in an upright position until it locks

into place.

2 Pull up the height adapter (3).

The cell shaft is extended.

3 Open the external light cover (4) of the cell shaft.

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Operation pHotoFlex / pHotoFlex Turb

4 Insert the 16 mm cell (marking points forward) so that it is po-

sitioned on the bottom of the cell shaft.

5 Close the external light cover (4).

The cell is ready to be measured.

Note

For optimum measurement results, the cell must always be covered by the external light cover. Otherwise, external light can falsify the measurement result.

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pHotoFlex / pHotoFlex Turb Operation

4.3 General operating principles

This section contains basic information on the operation of the pHotoFlex (Turb).

Operating elements,

display

Operating modes,

navigation

An overview of the operating elements and the display is given in section 1.2 and section 1.3.

An overview of the operating modes of the pHotoFlex (Turb) and the navigation through menus and functions can be found in section 4.3.1 and section 4.3.2.

4.3.1 Operating modes

The instrument has the following operating modes: ! Measurement

The display indicates measurement data in the measured value display

! Calibration

The display indicates a calibration process with calibration information, or a process to carry out a zero adjustment

! Data transmission

The meter transmits measuring datasets or calibration records to the serial interface

! Configuration

The display indicates a menu with further menus, settings and functions

4.3.2 Navigation

Measured value display In the measured value display, you can

! select a measuring mode with <M> (long pressure)

! select a measured parameter in the active measuring mode (e. g.

pH <−> mV) with <M> (short pressure)

! open the menu with <MENU>

! switch to the superordinate Start menu with <ESC>.

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

menus. The selection is made with the <▲><▼> keys. The current selection is displayed in reverse video.

! Menus

The name of the menu is displayed at the upper edge of the frame. Menus are opened by confirming with <START/ENTER>. Example:

Configuration

Photometry

Turbidity

pH & ORP

System

Info

! Settings

Settings are indicated by a colon. The current setting is displayed on the right-hand side. With <START/ENTER>, the selection of the possible settings is opened. Subsequently, the setting can be changed with <▲><▼> and <START/ENTER>. Example:

System

Language: Deutsch

Beep:

Illumination

Contrast

Temperature unit

Switchoff time

: On

Off

48 %

°C

30 min

! Functions

Functions are designated by the name of the function. They are immediately carried out by confirming with <START/ENTER>. Example: display the Calibration record function (in the pH & ORP / Calibration menu).

pH & ORP

Calibration record

Cal. type: AutoCal TEC

Calibration interval

Unit for slope

:i 2.00 4.01 7.00 10.01

007 d

mV/pH

! Messages

Information or instructions are marked by the i symbol. They can- not be selected.

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Example:

pH & ORP

i Buffer recognition TEC i Immerse sensor in buffer 1

The i symbol indicates info texts, e.g. messages, notes or instructions

Set temperature: 25 °C

Continue

Note

The principles of navigation are explained in the two following sections by reference of examples:

! Setting the language (section 4.3.3)

! Setting the date and time (section 4.3.4).

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4.3.3 Navigation example 1: Setting the language

Note

The following example describes in the language of the country how to set the language. On delivery, English is set as the language in the pHotoFlex (Turb). During initial commissioning, the language is set in the menu, Configuration / System / Language.

1 In the measured value display:

Open the Configuration menu with <MENU>. The instrument is in the configuration mode.

2 Select the System menu with <▲><▼>.

The current selection is displayed in reverse video.

3 Open the System menu with <START/ENTER>.

4 Select the Language menu with <▲><▼>.

The current selection is displayed in reverse video.

System

Language: Deutsch

Store

Display

Reset

Interface

Continue ...

5 Open the setting of the Language with <START/ENTER>.

System

Language:

Store

Display

Reset

Interface

Continue ...

Deutsch

6 Select the required language with <▲><▼>.

7 Confirm the setting with <START/ENTER>.

The setting is active. The menu is displayed in the selected language.

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

with <ESC>. or Switch to the measured value display with <M> (short pres-

sure). The instrument is in the measurement mode.

4.3.4 Navigation example 2: Setting the date and time

The meter has a clock with a date function. The date and time are indicated in the status line of the measured value display. When storing measured values and calibrating, the current date and time are automatically stored as well.

Numerals are generally entered via the number keys.

Setting the date, time

and date format

The correct setting of the date and time and date format is important for the following functions and displays:

! Current date and time

! Calibration date

! Identification of stored measured values.

Therefore, check the time at regular intervals.

Note

After a fall of the supply voltage (empty batteries or accumulator pack), the date and time are reset to 01.01.2003, 00:00 hours.

The data format can be switched from the display of day, month, year (dd.mm.yy) to the display of month, day, year (mm/dd/yy or mm.dd.yy).

1 In the measured value display:

Open the Configuration menu with <MENU>. The instrument is in the configuration mode.

2 Select and confirm the System / Continue ... / Date/time menu

with <▲><▼> and <START/ENTER>.

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Date/time

Time:

Date

Date format

14:53:40

30.10.03

: dd.mm.yy

Operation pHotoFlex / pHotoFlex Turb

3 Select and confirm the Time menu with <▲><▼> and

<START/ENTER>.

A display for the entry of numerals with the number keys opens up.

Time

14:53:40

4 Enter the time using the number keys.

The digit to be changed is displayed underlined.

Note

In the case of wrong entries, you can cancel the procedure with <ESC>. After canceling with <ESC>, it is possible to enter all digits once again. The new digits are only taken over by confirming with <START/EN- TER>.

5 Confirm the setting with <START/ENTER>.

The time is set.

6 Set the current Date as necessary. The setting is made similar-

ly to that of the time.

7 Change the date format as necessary.

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

with <ESC>. or Switch to the measured value display with <M> (short pres-

sure). The instrument is in the measurement mode.

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4.3.5 Menu overview

Photometry Measured parameter Concentration

% Transmission Absorbance

Programs

Dilution

Analysis timer On

Off

Reset

Turbidity i No settings required.

pH & ORP Measured parameter pH

ORP

Timer

Calibration Calibration

record

Cal. type TEC

Calibration interval

Unit for slope mV/pH

Man. temperature -20 ... +130 °C

Temperature unit °C, °F

Reset

NIST/DIN

1 ... 999 d

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System Language Deutsch

English Français Español

Measured value

Display

memory

RS232 download

Data filter Filter

ID PROG Date

Delete

i 4 of 1000 occupied

i Filter: No filter

Display Illumination Auto off

On Off

Contrast 0 ... 100 %

Brightness 0 ... 100 %

Reset

Interface Baud rate 1200, 2400, 4800,

9600, 19200

Info

Continue ... /

Date/time

Continue ... /

Switchoff time

Continue ... /

Beep

Output format ASCII

CSV

Time hh:mm:ss

Date

Date format dd.mm.yy

mm.dd.yy mm/dd/yy

10, 20, 30, 40, 50 min, 1, 2, 3, 4, 5, 10, 15, 20, 24 h

On Off

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4.4 System settings (System menu)

The following instrument features and general functions can be found in the Configuration / System menu:

! Language selection (Language)

! Memory and database functions (Store)

! Display settings (Display)

! Restore basic settings (Reset)

! Configuration of the interface for PC/printer (Interface)

! Setting the date/time (Date/time)

! Setting the switch-off time (Switchoff time)

! Setting the keyboard sound (Beep)

Settings/functions The settings can be found in the Configuration / System menu.

To switch to the Configuration menu, press the <MENU> key.

Menu item Setting Description

Language Deutsch

English

Select the language (see section 4.3.3)

Français Español

Store Display

RS232 download

Memory and database functions (see section 4.8.2)

Data filter Delete

Display Illumination

Contrast Brightness

Switch on/off the display illumination (see section 4.4.2)

Reset - Resets all system settings

to default (see section 4.10.1)

Interface Baud rate

Output format

Baud rate of the data interface (see section 4.4.3)

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Continue ... /

Date/time

Time Date Date format

Settings of time and date (see section 4.3.4)

Operation pHotoFlex / pHotoFlex Turb

Menu item Setting Description

Continue ... /

Switchoff time

10, 20, 30, 40, 50 min, 1, 2, 3, 4, 5, 10, 15, 20, 24 h

The automatic switchoff switches the meter off if no entry is made for a specified period of time (Switchoff time). This saves the batteries or accumulator pack.

Continue ... /

Beep

On Off

Switch on/off the beep on keystroke

4.4.1 Measured value memory

In the Measured value memory menu, you find functions to display and edit the stored measurement datasets:

! Display the measurement datsets on the screen (Display)

! Download the measurement datsets to the RS232 interface (RS232

download)

! Set up filter rules for the stored measurement datsets (Data filter)

! Erase all stored measurement datsets (Delete)

Settings/functions

! Information on the number of occupied memory locations

The settings can be found in the Configuration / System / Measured val- ue memory menu. To switch to the Configuration menu, press the <MENU> key.

Menu item Setting/func-

Description

tion

Display - Displays in pages all mea-

surement datasets that correspond to the filter settings.

Further options: ! Scroll through the

datasets with <▲><▼>.

! Output the displayed

dataset to the interface with <PRT>.

! Quit the display with

<ESC>.

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Menu item Setting/func-

Description

tion

RS232 download - Downloads to the interface

all measurement datasets that correspond to the filter settings. The download is ordered according to the date and time.

The process can take several minutes. To terminate the process prematurely, press <ESC>.

Data filter see

section 4.8.2

Allows to set filter criteria in order to display and download datasets to the interface.

Delete - Erases the entire contents

of the measuring data memory, independent of the filter settings.

Note: All calibration data remains

stored when performing this action.

All details on the subjects of memory and stored data is found in section 4.8.2.

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4.4.2 Display

In the Configuration / System / Display menu, you set the display fea- tures:

! Switching on/off the display illumination (Illumination)

! Display contrast (Contrast)

The settings can be found in the Configuration / System / Display menu. To switch to the Configuration menu, press the <MENU> key.

Settings

Menu item Setting Description

Illumination Auto off The display illumination is

automatically switched off if no key has been pressed for 30 seconds.

On Off

Switches the display illumination on or off permanently (see section 4.5.8)

Contrast 0 ... 100 % Changes the display con-

trast

Brightness 0 ... 100 % Changes the display bright-

ness

4.4.3 Interface

In the Interface menu, you set the features of the interface:

! Transmission speed (Baud rate)

! Output format (Output format)

Settings

The settings can be found in the Configuration / System / Interface menu. To switch to the Configuration menu, press the <MENU> key.

Menu item Setting Description

Baud rate 1200, 2400,

4800, 9600,

Baud rate of the data interface

19200

Output format ASCII

CSV

Output format for data transmission

For details, see section 4.9

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4.4.4 Date/time

In the Configuration / System / Continue ... / Date/time menu, you set the system clock:

! Current time (Time)

! Current date (Date)

! Format of the date display (Date format)

The settings can be found in the Configuration / System / Continue ... Date/time menu.

To switch to the Configuration menu, press the <MENU> key.

Settings

Menu item Setting Description

Time hh:mm:ss Enter the time with the

number keys

Date Enter the date with the

number keys

Date format dd.mm.yy

Settings of time and date.

mm.dd.yy mm/dd/yy

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4.5 Photometry

4.5.1 General information

Photometric measurements serve to determine chemical substances in liquid samples. For this determination, the substance to be determined has to be present in a form that is suitable for photometric measurement. At the same time, possible disturbing factors have to be excluded.

Before measurement, the sample has to be pretreated in order to bring the substance to be determined into the form that is suitable for measurement and at the same time exclude disturbing factors. Pretreatment of the sample is described in the analysis specification.

In a simple case, pretreatment can be to dissolve a solid substance in water; it can, however, also include chemical conversions, e. g. a digestion.

The chemicals required in the analysis specification are available as test sets.

Note

Suitable analysis specifications for test sets can be found in the photometry analysis manual (on CD-ROM). There you will also find further instructions on handling chemicals and on how to proceed when applying the analysis specifications.

Methods and the corresponding method data for many test sets are stored as programs

in the pHotoFlex (Turb). A program number is as-

signed to each program.

By entering the program number or by using a barcode reader the stored method data is loaded.

You can look up an overview of the available methods in the photometry analysis manual and display it on the screen of the pHotoFlex (Turb) (see section 4.5.7).

You can measure the following parameters with the pHotoFlex (Turb):

! Concentration [mg/l]

! % Transmission []

! Absorbance []

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

1 Clean the cells before filling them with sample and also before

measuring as necessary (see section 5.2.2). The cells must be absolutely clean and free of scratches.

2 For measurement, place the pHotoFlex (Turb) on a horizontal

surface.

4.5.2 Settings for photometric measurements

For photometric measurements, the following settings are available in the Configuration / Photometry menu:

! Setting the measured parameter

! Displaying a list of all programs

! Setting the dilution factor

Settings

! Switching on or off the analysis timer

! Resetting the settings for photometric measurements

The settings can be found in the Configuration / Photometry menu. To switch to the Configuration menu, press the <MENU> key.

Menu item Setting Description

Measured parameter

Concentration % Transmission Absorbance

Measured parameters in the Photometry measuring mode

Programs Display all programs with

the corresponding program data (see section 4.5.7).

Dilution Set the dilution factor (see

section 4.5.10)

Analysis timer On

Off

Switch on/off the analysis timer (see section 4.5.8)

Reset Reset all settings for the

Photometry measuring

mode (see section 4.10.3)

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4.5.3 Measuring the concentration

1 Press the <M> key (long pressure) repeatedly until the Pho-

tometry measuring mode is selected.

2 Press the <M> key (short pressure) repeatedly until the mea-

sured variable, Konzentration is selected.

First concentration measurement with the pHotoFlex (Turb)

Photometry \ Concentration

i Select program with <PROG>

01.02.05 15:12

Second and all further concentration measurements

Photometry \ Concentration

i Select program with <PROG> or with ▲

1: A5/25 MC NH4-N

16 mm 0.20 - 6.51 mg/l

▼

01.02.05 15:12

Note

From the second concentration measurement, the data of the program last used is automatically displayed here. With <▲><▼> you can quickly switch between the ten programs last used.

To select a program, you can also read in the program number of an analysis specification with a barcode reader (see section 8.2). The following step 3 is then skipped. You can directly start measurement.

The program number of the test is given in the analysis specification, on the list of available programs and on the packing of some tests (under the barcode).

3 Open the Program number display with <PROG>,

enter the required program number with the number keys and confirm with <START/ENTER>.

or (from the second concentration measurement): Select a program out of the last ten programs with <▲><▼>.

The program data is displayed.

Note

If a program number is selected that requires a measured blank value, the menu automatically guides to the blank value measurement.

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Photometry \ Concentration

i Insert sample i Start measurement

with <START>

1: A5/25 MC NH4-N 16 mm 0.20 - 6.51 mg/l

01.02.05 15:12

4 Insert the cell (see section 4.2).

5 Start the measurement with <START/ENTER>.

Measurement is started. The result is displayed.

Photometry \ Concentration

[BV]

A blank value measured by the user is used

0.74 mg/l

1: A5/25 MC NH4-N 16 mm 0.20 - 6.51 mg/l

01.02.05 15:12

4.5.4 Blank value (reagent blank value)

A blank value is required for every concentration measurement. For some programs (methods) for concentration measurement, the blank values are already stored in the photometer. They are used automatically. For all other programs, the blank value has to be determined separately before the first measurement. Each stored reagent blank value can be replaced by a blank value determined by the user.

Note

You will find more information on blank values in the photometry analysis manual.

A blank value is always stored for the program that has just been called up. It remains stored until it is erased (menu item, Delete blank value) or overwritten. The Reset function erases all blank values measured by the user and restores the blank values stored in the factory.

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If a blank value measured by the user is stored for a program, this blank value is used for measurement. The usage of the blank value measured by the user is documented and also indicated in the measured value display.

Operation pHotoFlex / pHotoFlex Turb

Measuring the blank

value

1 Press the <M> key (long pressure) repeatedly until the Pho-

tometry measuring mode is selected.

2 Press the <M> key (short pressure) repeatedly until the mea-

sured variable, Concentration is selected.

3 Select a program with <PROG> as necessary.

Note

The following measurement of the blank value applies only to the selected program. If no program is selected, the message i No program selected. appears on the display.

4 Open the adjustment menu with <CAL/ZERO>.

Photometry \ Adjustment

Zero adjust.

Measure blank value

Delete blank value

5 Using <▲><▼> and <START/ENTER>, select and start the

Measure blank value function. The menu-guided blank value measurement starts.

Follow the instructions on the display.

Measure blank value

i 2: A5/25 MC

Cell = 16 mm

i i Insert blank sample

Start measurement

6 Insert a cell with blank sample (see section 4.2).

7 Start the measurement of the blank value with <START/EN-

TER>. After measuring, the result of the blank value measurement is

displayed and stored. The result is displayed as i Blank value measurement suc- cessful! or i Blank value measurement erroneous!

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Measure blank value

i 2: A5/25 MC i Cell = 16 mm i Absorbance = 0.301 i Blank value mea-

surement

successful!

8 Confirm the result with <START/ENTER>.

The blank value measurement is completed. The meter is ready to measure.

or: Discard the result with <ESC>.

Subsequently, carry out a new blank value measurement.

4.5.5 Measuring the absorbance/transmission

Note

The transmission measurement is not described separately in the following example as it operates in exactly the same way as the absorbance measurement. The result of the measurement is displayed in % Transmission.

1 Press the <M> key (long pressure) repeatedly until the Pho-

tometry measuring mode is selected.

2 Press the <M> key (short pressure) repeatedly until the mea-

sured variable, Absorbance or % Transmission is selected.

Photometry \ Absorbance

i Select cell with

16 mm 610 nm

▲ ▼

01.02.05 15:12

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3 Select the cell diameter with <▲><▼> and confirm with

<START/ENTER>.

4 Select the wavelength with <▲><▼> and confirm with

<START/ENTER>.

Operation pHotoFlex / pHotoFlex Turb

Photometry \ Absorbance

i Insert sample i Start measurement

with <START>

16 mm 610 nm

01.02.05 15:12

5 Clean the cell (see section 5.2.2).

6 Insert the cell (see section 4.2).

7 Start the measurement with <START/ENTER>.

The measurement result is displayed when the measurement is finished.

Photometry \ Absorbance

0.532

16 mm 610 nm

01.02.05 15:12

4.5.6 Zero adjustment

The zero adjustment, i. e. measuring and storing the absorbance of a cell filled with water, is necessary after the meter is switched on. Additionally, we recommend to carry out a zero adjustment if the ambient temperature has changed.

Only perform the zero adjustment against distilled water in an optically perfect cell. The zero adjustment must be performed separately for each cell type.

1 Press the <M> key (long pressure) repeatedly until the Pho-

tometry measuring mode is selected.

2 Press the <M> key (short pressure) repeatedly until the mea-

sured variable, Concentration is selected.

3 Press the <CAL/ZERO> key.

The menu for adjustment measurements opens up.

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Photometry \ Adjustment

Zero adjust.

Measure blank value

Delete blank value

4 Using <▲><▼> and <START/ENTER>, select and start the

Zero adjust. function. The menu-guided zero adjustment starts.

Follow the instructions on the display.

Zero adjust.

i Insert zero

cell (dist. water)

Cell 16 mm

Start measurement

5 Insert the cell (see section 4.2)

6 Set another cell with <▲><▼> and <START/ENTER> as nec-

essary.

7 Start the measurement of the zero adjustment with <START/

ENTER>. After measuring, the result of the zero adjustment is displayed

and stored.

i Zero adjust. successful! (successful zero adjustment) or i Calibration error! (zero adjustment not successful)

is displayed as the result. The zero adjustment is completed.

Note

If i Calibration error! was displayed as the calibration result, a note au- tomatically reminds you of another zero adjustment before the next measurement. Measuring is not possible without a valid zero adjustment.

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8 Confirm the result with <START/ENTER>.

The zero adjustment is completed. The meter is ready to measure.

Operation pHotoFlex / pHotoFlex Turb

4.5.7 Programs

Displaying program

data

You can view the most important data of all methods. The method data is ordered according to the program number.

1 Open the Configuration / Photometry / Programs menu.

The display shows the most important data of the selected program.

Programs

1: A5/25 MC

0.20 - 8.00 mg/l NH4-N 16 mm

i Scroll with

▲ ▼

Program number, test, code

Measuring range with unit

Citation form

Diameter of the cell

Note

This data is also to be found in the photometry analysis manual in the overview of the test sets and in the individual analysis specifications for the test sets.

Updating programs Under http://www.WTW.com on the Internet, you can always find the

latest software version with the newest programs and method data for your pHotoFlex (Turb) (see A

PPENDIX: FIRMWARE UPDATE).

User-defined programs User-defined programs (methods) can be stored under program num-

bers between 900 and 999. You can store up to 100 user-defined programs (see section 4.13).

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4.5.8 Analysis timer

Measuring according to analysis specifications often means there are waiting periods between the individual steps. These waiting periods (time intervals) are stored in the instrument with the program data for each program. The active Analysis timer function automatically reminds you to observe these time intervals by means of the menu guidance.

If you want to manually enter time intervals, use the Timer function (see section 4.5.9).

The Analysis timer with the required time interval is automatically displayed at the due point. Start the Analysis timer with the <START/ENTER> key. It is not possible to shorten the time intervall. An acoustic signal sounds when the adjusted time interval has expired.

The Analysis timer function is switched on or off in the Configuration / Photometry/Analysis timer menu. This setting generally applies to all measurements with methods according to analysis specification.

4.5.9 Timer

When measuring according to analysis specifications, waiting periods often have to be kept between individual steps of the method. With the Timer function you manually set a time interval.

If you want to be automatically reminded of the given time interval, use the Analysis timer function (see section 4.5.8).

The timer is displayed in the measured value display. It always displays the remaining time of the adjusted time interval. When the adjusted time interval has expired, the timer indicates 00:00:00 and an acoustic signal sounds.

The Timer function is started in the Configuration / Timer menu by en- tering a time interval.

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4.5.10 Measuring diluted samples

If the concentration of a test sample exceeds the measuring range of a method, you can dilute the sample by a factor 1 ... 99 so that the concentration of the diluted test sample is within the measuring range of the method (see photometry analysis manual). Thus a valid measurement is possible.

After entering the factor for the dilution the meter converts the concentration to that of the undiluted sample. The display then indicates the measured value of the undiluted sample.

Entering the factor of

the dilution

1 Select the program for which a dilution factor is to be entered.

2 Open the Configuration / Photometry / Dilution menu.

The current factor of the dilution is displayed.

Dilution

Water + sample 0 + 1

i PROG 1

3 Open the display for the entry of numerals with <START/EN-

TER>.

4 Enter the factor of the dilution with the number keys.

The factor has to be a whole number between 0 ... 99.

5 Confirm the factor with <START/ENTER>.

6 Exit the Dilution menu with <ESC>.

For the following measurements with the selected program, the concentration of the undiluted sampled is displayed as the measurement result.

The entered dilution factor is only valid for the selected program. The dilution factor is erased if:

! the photometer is switched off

! a different program number is selected

! the factor 0 is entered in the Dilution menu.

If a dilution factor is active, it is indicated on the display during measurement in the form [x + 1].

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4.6 pH value / ORP voltage

4.6.1 General information

You can measure the following variables:

! pH value [ ]

! ORP [mV]

Caution

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

measurement

For reproducible pH measurements, it is essential to measure the temperature of the test sample. You have the following possibilities for measuring the temperature: ! Automatic measurement of the temperature by a temperature sen-

sor (NTC30 or Pt 1000) integrated in electrode.

! Manual determination and input of the temperature.

The meter recognizes whether a suitable electrode is connected and automatically switches on the temperature measurement.

The display of the temperature indicates the active temperature measuring mode:

Temperature sensor

Resolution of the temp. display

Temperature of the test sample

yes 0.1 °C automatic measurement

-1°C manual measurement and entry

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

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1 Connect a pH or ORP electrode to the meter.

2 Press the <M> key (long pressure) repeatedly until the pH &

ORP measuring mode is selected.

3 Press the <M> key (short pressure) repeatedly until the mea-

sured parameter, pH or ORP is selected.

4 Adjust the temperature of the solutions and measure the cur-

rent temperature if the measurement is made without a temperature sensor.

5 Calibrate or check the meter with the electrode.

Operation pHotoFlex / pHotoFlex Turb

4.6.2 Measuring the pH value

1 Perform the preparatory activities according to section 4.6.1.

2 Immerse the pH electrode in the test sample.

AutoRead

(Drift control)

Criteria With identical measurement conditions, the following applies:

pH & ORP

6.94

25.0

[AR]

3 Press the <M> key (short pressure) repeatedly until the mea-

sured variable, pH is selected.

The AutoRead function (drift control) continually checks the stability of the measurement signal. The stability has a considerable impact on the reproducibility of measured values. The display of the measured parameter flashes until a stable measured value is available.

Measured parameter

pH value Better than 0.01 > 30 seconds

°C

01.02.05 15:12

Reproducibility Response time

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4.6.3 Measuring the ORP voltage

Note

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

1 Perform the preparatory activities according to section 4.6.1.

2 Submerse the ORP electrode in the sample.

pH & ORP

[AR]

AutoRead

(drift control)

Criteria With identical measurement conditions, the following applies:

Measured parameter

ORP voltage better than 1 mV > 30 seconds

ORP

157

25.0

3 Press the <M> key (short pressure) repeatedly until the mea-

sured parameter, ORP is selected.

mV °C

01.02.05 15:12

Reproducibility Response time

Overview For pH and ORP measurements, the following settings are available in

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4.6.4 Settings for pH and ORP measurements

the Configuration / pH & ORP menu:

! Measured parameter

! Calibration record (display, print)

! Selecting the calibration type

! Entering the Calibration interval

! Selecting the Unit for slope

! Selecting the Temperature unit

! Reset

Operation pHotoFlex / pHotoFlex Turb

Settings/functions The settings can be found in the Configuration / pH & ORP menu.

To switch to the Configuration menu, press the <MENU> key.

Menu item Possible

setting

Measured parameter pH & ORP

Calibration /

- Displays the calibration

Calibration record

Calibration /

Cal. type

Calibration /

TEC NIST/DIN

1 ... 999 d Calibration interval for the

Calibration interval

Calibration /

Unit for slope

mV/pH %

Description

record of the last calibration.

Buffer sets to be used for pH calibration.

For details, see section 4.6.5.

pH electrode (in days). The meter reminds you to

calibrate regularly by the flashing sensor symbol in the measured value display.

Unit of the slope. The % display refers to the

Nernst slope of

-59.16 mV/pH (100 x determined slope/Nernst slope).

Man. temperature -20 ... +130 °C Entry of the manually de-

termined temperature. For measurements without temperature sensor only.

Temperature unit °C, °F Degrees Celsius

Degrees Fahrenheit

Reset Reset all settings for the

pH & ORP measuring

mode (see section 4.10.3)

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4.6.5 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 meter. Thus, you should calibrate at regular intervals.

When to calibrate? ! After connecting another electrode

! When the sensor symbol flashes:

– after the calibration interval has expired

– after voltage interruption (e.g. empty batteries, empty

accumulator pack)

Buffer sets for

calibration

You can use the buffer sets quoted in the table for an automatic calibration. The pH values are valid for the specified temperature values. The temperature dependence of the pH values is taken into account during calibration.

Buffer set Name on the

display

pH values at 25 °C

Technical buffer solutions TEC 2.00

4.01

7.00

10.01

NIST/DIN buffer solutions NIST/DIN 1.679

4.006

6.865

9.180

12.454

Note

The buffers are selected in the Configuration / pH & ORP / Cal. type menu, see section 4.6.4).

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Calibration points Calibration can be performed using one, two or three buffer solutions in

any order (single-point-, two-point or three-point calibration). The meter determines the following values and calculates the calibration line as follows:

Determined val-

Displayed calibration data

ues

1-point Asy ! Asymmetry = Asy

! Slope = Nernst slope

(-59.16 mV/pH at 25 °C)

2-point Asy

Slp.

3-point Asy

Slp.

! Asymmetry = Asy

! Slope = Slp.

! Asymmetry = Asy

! Slope = Slp.

The calibration line is calculated by linear regression.

Note

You can display the slope in the unit, mV/pH or % (see section 4.6.4).

AutoRead The calibration procedure automatically activates the AutoRead func-

tion. The current AutoRead measurement can be terminated at any time (accepting the current value).

Calibration record When finishing a calibration, the new calibration values are displayed

Displaying and down-

loading calibration data

to interface

as an informative message (

i symbol) first. Then you can decide

whether you want to take over these values of the new calibration or whether you want to continue measuring with the old calibration data. After accepting the new calibration values the calibration record is displayed.

You can view the data of the last calibration on the display. Subsequently, you can download the displayed calibration data to the interface, e. g. to a printer or PC, with the <PRT> key.

The calibration record of the last calibration can be found under the Configuration / pH & ORP / Calibration / Calibration record menu item.

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Sample printout of a

record

31.10.03 16:13 pHotoFlex Ser. no. 12345678

Calibration pH & ORP Calibration date 31.10.03 16:13:33 Calibration interval 7 d

AutoCal TEC

Buffer 1 4.01 Buffer 2 7.00 Buffer 3 10.01 Voltage 1 184.0 mV 24.0 °C Voltage 2 3.0 mV 24.0 °C Voltage 3 -177.0 mV 24.0 °C Slope -60.2 mV/pH

Asymmetry 4.0 mV Sensor +++

Calibration evaluation After calibrating, the meter automatically evaluates the calibration. The

asymmetry and slope are evaluated separately. The worse evaluation of both is taken into account. The evaluation appears on the display and in the calibration record.

Sample display

Calibration record

Asymmetry [mV]

Slope [mV/pH]

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

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

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

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

Clean the electrode according to the electrode operating manual

---- ----

Eliminate the error according to chapter 6 W

HAT TO DO IF...

< -30 or > 30

-57 ... -56

-56 ... -50

... -62 or ... -50

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

1 Connect the pH electrode to the meter.

The pH measured value display is displayed on the screen.

2 Keep the buffer solutions ready. Adjust the temperature of the

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

4.6.6 Carrying out the TEC and NIST/DIN calibration procedures

The two calibration procedures only differ in the usage of different buffer sets (see section 4.6.5). Make sure the Cal. type is correctly set in the pH & ORP / Calibration menu (see section 4.6.4).

For this procedure, use any one, two or three WTW technical buffer solutions in ascending or descending order.

The TEC calibration is described below. With the NIST/DIN calibration, the NIST/DIN buffer recognition and different nominal buffer values are displayed. Apart from that, the procedure is identical.

Note

The TEC 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 on the Internet.

1 Press the <M> key (short pressure) repeatedly until the mea-

sured parameter, pH or ORP is selected.

2 Start the calibration with <CAL/ZERO>.

The calibration display appears.

pH & ORP \ Calibration

i Buffer recognition TEC i Immerse sensor in buffer 1

Continue

3 Immerse the electrode in buffer solution 1.

4 If the Set temperature menu item appears, measure and enter

the temperature of the buffer manually (measurement without temperature sensor).

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5 Using <▲><▼>, select Continue and press <START/EN-

TER>. The buffer is measured.

The measured value is checked for stability (AutoRead).

pH & ORP \ Calibration

i Buffer value = 7.00 i U = 3 mV i Temperature =

Terminate AutoRead

24.8 °C

6 Wait for the end of the AutoRead measurement or accept the

calibration value with <START/ENTER>. The calibration display for the next buffer appears.

pH & ORP \ Calibration

i Buffer recognition TEC i Immerse sensor in buffer 2

Exit with one point calibration

Continue

7 For single-point calibration, select Exit with one point calibra-

tion with <▲><▼> and confirm with <START/ENTER>.

The calibration is completed as a single-point calibration. The new calibration values are displayed as an informative

message (

i).

You have the following options: ! Accept the new calibration values with <START/ENTER>.

Subsequently, the calibration record is displayed and output to the interface at the same time.

! To switch to the measured value display without

accepting

the new calibration values, press <M> (short pressure) or

<ESC>.

Note

For single-point calibration, the instrument uses the Nernst slope (-59.16 mV/pH at 25 °C) and determines the asymmetry of the electrode.

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Continuing for two-point

calibration

(Cal. type TEC)

8 Thoroughly rinse the electrode with distilled water.

9 Immerse the electrode in buffer solution 2.

10 If the Set temperature menu item appears, measure and enter

the temperature of the buffer manually (measurement without temperature sensor).

11 Using <▲><▼ >, select Continue and press <START/EN-

TER>. The buffer is measured. The measured value is checked for stability (AutoRead).

pH & ORP \ Calibration

i Buffer value = 10.01 i U = -177 mV i Temperature = 24.8 °C

Terminate AutoRead

12 Wait for the end of the AutoRead measurement or Terminate

AutoRead with <START/ENTER> and take over the calibration

value. The calibration display for the next buffer appears.

pH & ORP \ Calibration

i Buffer recognition TEC i Immerse sensor in buffer 3

Exit with 2 point calibration

Continue

13 For two-point calibration, select Exit with 2 point calibration with

<▲><▼> and confirm with <START/ENTER>. The calibration is completed as a two-point calibration. The new calibration values are displayed as an informative

message (

i).

You have the following options: ! Accept the new calibration values with <START/ENTER>.

Subsequently, the calibration record is displayed and output to the interface at the same time.

! To switch to the measured value display without

accepting

the new calibration values, press <M> (short pressure) or

<ESC>.

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Continuing for three-

point calibration

(Cal. type TEC)

14 Thoroughly rinse the electrode with distilled water.

15 Immerse the electrode in buffer solution 3.

16 If necessary, measure the temperature of buffer 3 manually,

then enter and confirm it with <▲><▼> and <START/ENTER> in the Set temperature setting.

17 Using <▲><▼>, select Continue and press <START/EN-

TER>. The buffer is measured. The measured value is checked for stability (AutoRead).

pH & ORP \ Calibration

i Buffer value = 4.01 i U = 184 mV i Temperature = 24.8 °C

Terminate AutoRead

18 Wait for the end of the AutoRead measurement or Terminate

AutoRead with <START/ENTER> and take over the calibration

value. The new calibration values are displayed as an informative

message (

i).

You have the following options: ! Accept the new calibration values with <START/ENTER>.

Subsequently, the calibration record is displayed and output to the interface at the same time.

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! To switch to the measured value display without

accepting

the new calibration values, press <M> (short pressure) or

<ESC>.

Operation pHotoFlex / pHotoFlex Turb

4.7 Turbidity

4.7.1 General information

Venting the sample Air bubbles in the sample affect the measuring result to a massive ex-

tent because they have a large scattering effect on the incident light. Larger air bubbles cause sudden changes in the measured values whereas smaller air bubbles are recorded by the instrument as turbidity. Therefore, avoid or remove air bubbles:

Avoiding or removing

air bubbles

! During sampling, ensure all movement is kept to a minimum

! If necessary, vent the sample (ultrasonic baths, heating or adding a

surface-active substance to reduce the surface tension)

4.7.2 Aligning and marking a cell

Even completely clean quality cells exhibit tiny directional differences in their light transmittance. Therefore, if you want to achieve accurate and reproducible measurement results, it is necessary to always align the sample cells and cells for calibration standards in the same way (see section 2130 of the "Standard Methods for the Examination of Water and Wastewater", 19th edition). To do so, the optimum alignment of the cell is determined.

Aligning the cell

1 Press the <M> key (long pressure) repeatedly until the Turbid-

ity measuring mode is selected.

2 Clean the cell (see section 5.2.2).

3 Insert the cell (see section 4.2).

4 Align the cell:

! Press and hold the <START/ENTER> key.

! Slowly and in small steps turn the cell by one complete ro-

tation (by 360 °). After each step wait for a short time until the displayed measured value is stable.

! Turn the cell back to the position with the lowest measured

value.

Note

To keep the drift as low as possible, the time for aligning the cell while pressing and holding the <START/ENTER> key is limited to 30 sec- onds. After this time, the meter starts measuring automatically.

5 Release the <START/ENTER> key.

Measurement starts. The measured value is displayed.

Marking a cell To be able to quickly bring a cell into the optimum position, it is helpful

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to mark the optimum position of the cell once it is determined. This shortens each measurement or calibration procedure with this cell considerably.

The marking can, e. g., be done on a label on the cap of the cell.

6 Mark the optimum position of the cell.

The cell is prepared for the shortened measuring and calibration procedures.

4.7.3 Measuring turbidity

Caution

Never pour any liquids directly into the cell shaft. Always use a cell for measurement. The meter only measures precisely if the cell is closed with the black light protection cap (WTW cells).

Measuring

Note

The outside of the cell always has to be clean, dry, and free of fingerprints and scratches. Clean the cell before starting to measure (see section 5.2.2). Only hold the cells by the top or by the black light protection cap.

1 Press the <M> key (long pressure) repeatedly until the Turbid-

ity measuring mode is selected.

2 Rinse out a clean cell with the sample to be measured:

Pour approximately 10 ml sample into the cell. Close the cell and rotate it several times before throwing the sample away.

3 Repeat the rinsing procedure twice more.

4 Fill the cell with the sample to be measured (approx. 15 ml).

Close the cell with the black light protection cap.

5 Clean the cell (see section 5.2.2).

6 Insert the cell (see section 4.2).

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7 Align the cell:

! Marked cell

– Align the marking on the cell cap with the marking on the

cell shaft.

– Press and for a short time hold the <START/ENTER>

key until the measured value is displayed.

! Unmarked cell (see page 62)

– Press and hold the <START/ENTER> key.

– Slowly and in small steps turn the cell by one complete

rotation (by 360 °). After each step wait for a short time until the displayed measured value is stable.

– Turn the cell back to the position with the lowest mea-

sured value.

Note

To keep the drift as low as possible, the time for aligning the cell while pressing and holding the <START/ENTER> key is limited to 30 sec- onds. After this time, the meter automatically starts measuring or calibrating.

Display if the

measuring range is

exceeded

8 Release the <START/ENTER> key.

Measurement starts. The measured value is displayed.

Turbidity

157.0

9 Repeat the steps 2 to 8 for further samples.

If the measured value is outside the measuring range of the pHotoFlex Turb, it is indicated on the display:

Turbidity

> 1100

FNU NTU

01.02.05 15:12

FNU NTU

01.02.05 15:12

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4.7.4 Calibration

When to calibrate? ! Regularly every 90 days

! With a temperature change

Calibration procedures

and calibration

For the menu-guided three-point calibration you need the following three calibration standards in the mentioned order:

standards

Standard no. NTU/FNU

1 1000

2 10,0

30,02

Preparing calibration Perform the following preparatory activities when you want to calibrate:

1 Keep the cells with the required calibration standards ready

and mark them as necessary (see page 62).

2 Clean the cell (see section 5.2.2).

3 Insert the cell (see section 4.2).

Caution

Never open the cells with the calibration standards.

Carrying out calibration

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1 Press the <M> key (long pressure) repeatedly until the Turbid-

ity measuring mode is selected.

2 Press the <CAL/ZERO> key.

The menu-guided calibration begins. Follow the instructions on the display.

Turbidity \ Calibration

i Insert standard

1000 FNU/NTU

i Press and hold <START> i Align sample

3 Insert the cell with the displayed calibration standard (here e.g.

1000 NTU/FNU) in the cell shaft (see section 4.2).

Operation pHotoFlex / pHotoFlex Turb

4 Align the cell:

! Marked cell:

– Align the marking on the cell cap with the marking on the

cell shaft.

– Press and time hold the <START/ENTER> key until the

measured value is displayed.

! Unmarked cell (see page 62)

– Press and hold the <START/ENTER> key.

– Slowly and in small steps turn the cell by one complete

rotation (by 360 °).

– After each step wait for a short time until the displayed

measured value is stable.

– Turn the cell back to the position with the lowest mea-

sured value.

Turbidity \ Calibration

i Turb. = 1000 FNU/NTU i Start calibration

by releasing <START>

5 Release the <START/ENTER> key.

Measurement of the calibration standard begins.

Note

Before measuring the third calibration standard of 0.02 NTU/FNU you can exit the calibration with <ESC> at any time. The new calibration data is discarded. The old calibration data is further used.

6 Repeat the steps 4 - 6 with the calibration standards, 10.0 NTU/

FNU and 0.02 NTU/FNU. After measuring the 0.02 NTU/FNU calibration standard, the

calibration result (i Calibration successful! or i Calibration er- ror!) is displayed and stored. Calibration is completed.

7 Confirm the calibration result with <START/ENTER>.

The display shows instructions for the first measurement.

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Turbidity

i Insert sample i Press and hold <START> i Align sample

Note

If i Calibration error! was displayed as the calibration result, a note ap- pears on the display to recalibrate before measuring. Should a valid calibration not be possible the meter also offers to continue measuring with the last valid calibration data.

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4.8 Storing

The meter has 1000 storage locations for measurement datsets. You can transmit measured values (datasets) to the data storage with the <STO> key. Each storage process transmits the current dataset to the interface at the same time.

The number of storage locations that are still free is displayed in the Store menu. The number of storage locations that are occupied is displayed in the System \ Measured value memory menu.

Measurement dataset A complete dataset consists of:

! Date/time

! ID number (ID)

! and the following measurement data depending on the selected

measuring mode

Measuring

Measurement data

mode

Photometry: ! Program number

! Measured value

! Citation form

! Use of a blank value (BV)

! Dilution (x +1)

Turbidity: ! Measured value

pH & ORP: ! Measured value (pH/mV)

! Measured temperature value (°C/°F)

! AutoRead info (AR)

AR appears with the measured value if the AutoRead criterion was met while storing (stable measured value). Otherwise, the AR display is missing.

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4.8.1 Storing measurement datsets

Proceed as follows to transmit to the data storage and simultaneously output to the interface a measurement dataset:

1 Press the <STO> key.

The Store display appears.

Store (996 free)s

i 02.02.2005 11:24:16

0.00 mg/l PO4-P BV

PROG 1

ID:

Store (ID: 1:

2 Using <▲><▼>, <START/ENTER> and the number keys,

change and confirm the ID number (ID) as necessary (0 ...

999).

3 Using <START/ENTER> or <STO>, confirm Store.

The dataset is stored. The instrument switches to the measured value display.

Note

A measurement dataset is stored quickly by twice pressing <STO>. It is stored with the ID last set.

If the storage is full You can erase the entire storage (see section 4.8.5), or overwrite the

oldest dataset with the next storing procedure. A security prompt appears before a dataset is overwritten.

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4.8.2 Filtering measurement datsets

The functions to display and download stored measurement datsets (see section 4.4.1) refer to all stored measurement datsets that correspond to the adjusted filter criteria.

The settings can be found in the Configuration / System / Measured val- ue memory /Data filter menu. To switch to the Configuration menu, press the <MENU> key.

Data filter

Menu item Setting/function Description

Filter Filter criteria:

No filter Data filter switched off

ID Selection according to ID

number

PROG Selection according to pro-

gram

Date Selection according to pe-

riod

ID + PROG Selection according to pro-

gram and ID number

ID + Date Selection according to pe-

riod and ID number

PROG + Date Selection according to pro-

gram and date

ID + PROG + Date Selection according to ID,

program and date

ID Entry of filter criteria

PROG

These menu items are made visible by selecting

Date

the filter criteria in the Filter menu.

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4.8.3 Displaying measurement datsets

You can read out stored datasets on the display. Only those datasets are displayed that correspond to the selected filter criteria (see section 4.8.2).

Start reading out the data on the display in the menu, Configuration / System / Measured value memory / Display.

Display of a dataset

02.02.2005 11:24:16 ID: 1

7.000 (pH) 24.8 °CAR

i Scroll with

▲ ▼

Further datasets that correspond to the filter criteria are displayed with the <▲><▼> keys.

Quitting the display To quit the display of stored measurement datasets, you have the fol-

lowing options: ! Switch directly to the measured value display with <M> (short pres-

sure).

! Leave the display and switch to the higher menu with <ESC> or

<START/ENTER>.

4.8.4 Downloading the measurement datsets to the RS232 interface

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You can download stored datasets to the RS232 interface. Only those datasets are downloaded that correspond to the selected filter criteria (see section 4.8.2).

The datasets are downloaded in the adjusted output format (see section 4.9.3).

The data download to the interface is started in the menu, Configura- tion / System / Measured value memory / RS232 download.

Operation pHotoFlex / pHotoFlex Turb

4.8.5 Erasing stored measurement datasets

You can erase the stored measurement datsets altogether if you do no longer need them.

Erasing all measurement datsets is done in the menu, Configuration / System / Measured value memory / Delete.

Note

Erasing individual datasets is not possible. If all storage locations are occupied, however, it is possible to overwrite the oldest dataset at a time. A security prompt appears before a dataset is overwritten.

4.9 Transmitting data (RS 232 interface)

Via the RS 232 interface, you can transmit data to a PC or an external printer.

4.9.1 Connecting a PC/external printer

Connect the interface to the devices via the AK540/B (PC) or AK540/S (external printer) cable.

Caution

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 can be selected from:

1200, 2400, 4800, 9600, 19200 The baud rate must agree with the baud rate set on the PC/printer.

Handshake RTS/CTS

PC only:

Parity none

Data bits 8

Stop bits 1s

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Socket assignment

1 RTS

2 RxD 3 TxD 4 DTR 5 SG

RS 232 REC

6 CTS

4.9.2 Configuring the RS232 interface

For an error-free data transmission, the RS232 interface should be set to the same transmission speed (Baud rate) on the pHotoFlex (Turb) and PC/printer.

You can set the following values for the baud rate on the pHotoFlex (Turb) : 1200, 2400, 4800, 9600, 19200.

The baud rate is selected in the menu, Configuration / System / Inter- face / Baud rate.

4.9.3 Selecting the output format of datasets

Output format, ASCII

For downloading data to the interface you can select the output format.

It is selected in the menu, Configuration / System / Interface / Output format.

The ASCII output format delivers formatted datasets. The CSV output format delivers datasets separated by ";".

pHotoFlex Ser. no. 12345678

31.10.04 09:56:20 ID: 1

10.01 (pH) AR 25 °C ________________________________________

pHotoFlex Ser. no. 12345678

31.10.04 15:48:08 ID 1 / PROG 2

1.1 mg/l Pb [BV][9 + 1] ________________________________________

etc...

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Output format, CSV

123456789

15.01.05;15:06:49;1;8;O2;[BW];[9 + 1];6.5;mmol/l;VALID;

15.01.05;15:09:52;0;;;[AR];;7.00;<pH>;VALID;25;°C;VALID

11 12 13

Data Description

1 Date Date of storing

2 Time Time of storing

3 ID adjusted ID

4 Program number only for the measured parameter,

Concentration

5 Citation form only for the measured parameter,

Concentration

6 AR/

! AutoRead (measuring mode, pH & ORP)

! Blank value (measured parameter,

Concentration)

7 Dilution only for the measured parameter,

Concentration

8 Measured value ! Measured value or

! Upper/lower measuring range limit

(only with measured value status, OFL/ UFL)

9 Unit of 8 ! Unit of the measured value or

! Designation of dimensionless measured

values, e.g. <pH>

10 Measured value

status of 8

! VALID: Measured value valid

! INVALID: Measured value invalid

! UFL: Measured value below the lower

measuring range limit

! OFL: Measured value above the upper

measuring range limit

11 Temperature val-

ue / wavelength of the measurement

! Temperature (measuring mode, pH &

ORP)

! Wavelength (measured parameter,

Absorbance / % Transmission)

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Data Description

12 Unit of 11 ! °C / °F

! nm

13 Measured value

VALID, INVALID, UFL, OFL

status of 11

4.9.4 Transmitting data

The following table shows which data are transmitted to the interface in which way:

Data Operation / description

Current measured value

! Press <PRT>.

! Simultaneously with every manual storage

process.

Stored measured values

! Display stored dataset and press <PRT>.

! All datasets according to the filter criteria via

the RS232 download function (see section 4.8.2).

Calibration record (pH electrode)

! Calibration record of a pH electrode with

<PRT> (after calling up from the storage or at the end of a calibration).

! Calibration record of a pH electrode at the

end of a calibration procedure is printed automatically.

Note

With the <PRT> key you output the data that is being shown on the display to the interface (displayed measured values, stored measurement datsets, calibration record).

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4.10 Reset

You can reset (initialize) all system and measurement settings.

Note

For turbidity measurement, there are no resettable settings.

4.10.1 Resetting the system settings

With the System / Reset function, all resettable settings are reset.

! Settings for pH & ORP (see section 4.10.3)

! Settings for Photometry (see section 4.10.2)

! System settings

System setting Default settings

Baud rate 4800 Baud

Output format ASCII

Illumination Auto off

Contrast 50 %

Brightness 50 %

Switchoff time 30 min

Beep On

Measuring mode Photometry

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4.10.2 Resetting the photometer settings

With the Photometry / Reset function, all photometer settings are reset.

Setting Default settings

PROG 0

Cell size 16 mm

Measured parameter Konzentration

Wavelength 436 nm

Blank values all erased

4.10.3 Resetting the pH settings

Note

The calibration data are reset to the default settings together with the measuring parameters. Recalibrate after performing a reset.

The following settings for pH measurements are reset to the default settings with the Reset function:

Setting Default settings

Cal. type TEC

Calibration interval 7 d

Measured parameter pH & ORP

Asymmetry (Asy)0 mV

Slope (Slp.) -59.16 mV/pH

Temperature, manual 25 °C

Temperature °C

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4.11 Meter information

The following meter information is listed in the Configuration / Info menu:

! Model designation

! Software version

! Version number(s) of the stored program data

! Series number of the meter

Info

i Model: pHotoFlex i Software: V 0.35 i Prog. i Ser. no.: 04280003

: V 0.07

4.12 Software update

With a software update you obtain the current software with all new programs and method data (see appendix).

A software update comprises

! new instrument software

! new programs (methods)

! revisions of existing methods

The current software version can be found on the Internet under www.WTW.com.

The proceeding for updating the software can be found in the appendix (see A

PPENDIX: FIRMWARE UPDATE).

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pHotoFlex / pHotoFlex Turb Operation

4.13 Administrating user-defined methods

User-defined programs can be

! entered

! read out

! erased.

To store user-defined programs (methods) in the meter, determine a calibration line for your method yourself and transmit the data of this calibration line to the pHotoFlex (Turb).

Administration of the method data can be carried out in the LSdata software (see operating manual LSdata) or with the aid of a terminal program (section 4.13.1).

You need the following data in any case:

Data Possible entries/examples

Program No: 900 ... 999

Model: Any name

(max. 5 characters)

Cuvette [mm]: 16 or 28

Wave length [nm]: 436, 517, 557, 594, 610 or 690

MRB:

e.g. 0.05

(measuring range beginning)

MRE:

e.g. 8.00

(measuring range end)

E0: (Offset) e.g. 0.0

Slope: e.g. 1.0

Resolution: 0.0001, 0.001, 0.01, 0.1, 1, 2, 5, 10

or 100

Formula: (citation form) e.g. PO4-P (max. 9 characters)

Unit e.g. mg/l (max. 7 characters)

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Operation pHotoFlex / pHotoFlex Turb

4.13.1 Administrating user-defined programs with a terminal program

Generally, a terminal program serves to establish a connection to a device on a data interface and to communicate with the device via a console on the display. Thus, it is also possible to send command lines. Terminal programs are available for different operating systems by different manufacturers. Windows (version 95 to XP) contains the "HyperTerminal" terminal program. It is in the program menu under accessories. For more detailed information please refer to the user information of the terminal program.

Note

The CD-ROM contains a configuration file for the HyperTerminal program. By double-clicking the configuration file (*.ht), the HyperTerminal with the required pre-settings for data exchange with the meter is opened. The pHotoFlex (Turb) can administrate the database of user-defined programs via command lines.

Storing user-defined

programs

1 With the aid of the AK 540/B interface cable, connect the

pHotoFlex (Turb) 540 to the serial interface (COM port) of the PC (see section 8.1.1).

2 Make sure the pHotoFlex (Turb) is switched on.

3 Start the terminal program on the PC.

4 Configure the connection settings for the COM interface as

necessary.

Enter a command line according to the following scheme in the terminal program: U.500#11,Program No,Model,Cuvette [mm],Wave length [nm],MRB, MRE,E0,Slope,Resolution,Formula,Unit

Example:

U.500#11,900,Test,16,436,0.0,2.0,0.0,1.0,0.01,test, mg/l

The individual data sections of the command line are separated by commas. The dot "." has to be used as a decimal separator within a data section.

5 Enter the command line.

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pHotoFlex / pHotoFlex Turb Operation

6 Finish the command line with Enter.

The data is transmitted to the pHotoFlex (Turb).

Note

If a program is already stored under the selected number, the programming procedure is canceled. To store the program under the selected number, first erase the program stored under the number.

After successful transmission, the terminal program writes "!>". If the transmission failed, the terminal program writes "!>".

Erasing user-defined

programs

To erase user-defined programs, enter a command line according to the following scheme in the terminal program:

Erase all user-defined programs

Erase one userdefined program

Command line U.520 U.521#1,Program No

Example U.520 U.521#1,900

7 Enter the command line.

8 Finish the command line with Enter.

The data is transmitted to the pHotoFlex (Turb). The requested data is displayed on the terminal as the result.

After successful transmission, the requested data is displayed on the terminal. If the transmission failed, the terminal program writes "!>".

Reading out user-

defined programs

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To read out user-defined programs, enter a command line according to the following scheme in the terminal program:

Read out all userdefined programs

Read out one userdefined program

Command line U.510 U.511#1,Program No

Example U.510 U.511#1,900

9 Enter the command line.

Operation pHotoFlex / pHotoFlex Turb

10 Finish the command line with Enter.

The data is transmitted to the pHotoFlex (Turb). The requested data is displayed on the terminal as the result.

After successful transmission, the terminal program writes "!>". If the transmission failed, the terminal program writes "!>".

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pHotoFlex / pHotoFlex Turb Maintenance, cleaning, disposal

5 Maintenance, cleaning, disposal

5.1 Maintenance

The meter is almost maintenance-free. The only maintenance task is replacing the batteries or accumulator pack.

5.1.1 Inserting/exchanging the batteries

Caution

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 battery compartment.

1 Open the battery compartment:

– Unscrew the two screws (1) on the underside of the meter,

– Remove the lid of the battery compartment (2).

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2 If necessary, take four old batteries out of the battery compart-

ment.

3 Insert four batteries (3) in the battery compartment.

4 Close the battery compartment and fix it with the screws.

Maintenance, cleaning, disposal pHotoFlex / pHotoFlex Turb

5.1.2 Retrofitting the accumulator pack

Caution

Use original WTW accumulator packs only.

Together with the power pack the accumulator pack is available as an accessory (see section 8.1).

1 Open the battery compartment:

– Unscrew the two screws (1) on the underside of the meter,

– Remove the lid of the battery compartment (2).

2 If necessary, take four old batteries out of the battery

compartment.

3 Connect the cable of the accumulator pack with the socket (3)

on the bottom of the battery compartment and insert the accumulator pack in the battery compartment.

4 Close the battery compartment and fix it with the screws.

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pHotoFlex / pHotoFlex Turb Maintenance, cleaning, disposal

5.2 Cleaning

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

Caution

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

5.2.1 Cleaning the cell shaft

If liquid is in the cell shaft (e.g. due to a spilled cell), clean the cell shaft as follows:

Caution

Cells can contain poisonous or corrosive substances. If the content is released follow the danger warnings on the cell. If necessary, take corresponding protective measures (protective goggles, protective gloves etc.).

1 Switch the pHotoFlex (Turb) off and pull out the power plug.

2 Rinse the cell shaft with distilled water.

5.2.2 Cleaning the cells

Cells have to be clean, dry, and free of fingerprints and scratches. Therefore, clean them regularly:

1 Clean the cells inside and out with hydrochloric acid or labora-

tory soap.

2 Rinse out several times with distilled water.

3 Let them dry in the air.

4 Only hold the cells by the top or by the light protection cap so

that the optical path is not impaired.

5 Before measuring, clean the cell with the enclosed cleaning

cloth.

Note

Scratches in the glass change the optical characteristics of the cell and falsify the measured value. For this reason, never use scratched cells!

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Maintenance, cleaning, disposal pHotoFlex / pHotoFlex Turb

5.3 Disposal

Packing This meter is sent out in a protective transport packing.

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

Batteries/accumulator

pack

NiMH

Meter Dispose of the meter without the batteries and accumulator pack as

Remove the batteries or accumulator pack from the meter (see section 5.1). Dispose of the batteries or accumulator pack at a suitable facility according to local legal requirements. It is illegal to dispose of the accumulator pack with household refuse.

electronic waste at an appropriate collection point.

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pHotoFlex / pHotoFlex Turb What to do if...

6 What to do if...

6.1 General errors

Display, LoBat

Instrument does not

react to keystroke

RS232 interface

does not react

Cause Remedy

– The batteries or accumulator

pack are largely depleted

Cause Remedy

– Software error

– Operating condition undefined

or EMC load unallowed

Cause Remedy

– Software error

– Operating condition undefined

or EMC load unallowed

– Insert new batteries

– Charge the accumulator pack

(see section 3.2)

– Processor reset:

Press the <START/ENTER> and <PRT> key simultaneously.

– Processor reset:

Press the <START/ENTER> and <PRT> key simultaneously.

Error message,

0, 8, 16, 16384

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Cause Remedy

Error

– Instrument error – Repeat measurement

– Meter defective,

send meter to WTW for repair and quote the error number

What to do if... pHotoFlex / pHotoFlex Turb

6.2 Photometry

Measuring range

undercut or exceeded

Obviously incorrect

measured values

Cause Remedy

– Program not suitable – Select program with suitable

measuring range

– Dilute the sample

Cause Remedy

– Measurement disturbed by

– Close the external light cover.

external light

– Cell not correctly inserted – Insert the cell so that it is

positioned on the bottom of the cell shaft.

– Cell contaminated – Clean the cell

– Cell shaft contaminated – Clean the cell shaft

– Dilution set incorrectly – Set the dilution

– Selected program unsuitable – Select other program

– Zero measurement incorrect – Perform zero measurement

Measuring range

undercut or exceeded

– Blank value incorrect – Remeasure the blank value

6.3 pH value / ORP voltage

Cause Remedy

Electrode:

– Air bubble in front of the

diaphragm

– Air in the diaphragm – Extract air or

– Gel electrolyte dried out – Replace electrode

Test sample

– The pH value lies outside the

measuring range

– Remove air bubble

moisten diaphragm

– not possible

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pHotoFlex / pHotoFlex Turb What to do if...

Measured value display

----

(calibration error)

Cause Remedy

Electrode:

– Diaphragm contaminated – Clean diaphragm

– Membrane contaminated – Clean membrane

– Moisture in the plug – Dry plug

– Not enough electrolyte – Top up electrolyte

– Electrode obsolete – Replace electrode

– Electrode broken – Replace electrode

– Socket damp – Dry socket

Calibration procedure:

– Incorrect solution temperature

– Set up correct temperature

(without temperature sensor)

– Incorrect buffer solutions – Select buffer solutions

suitable for the calibration procedure

No stable measured

value

– Buffer solutions too old – Use only once.

Note the shelf life

Cause Remedy

pH electrode:

– Diaphragm contaminated – Clean diaphragm

– Membrane contaminated – Clean membrane

Test sample

– pH value not stable – Measure with air excluded if

necessary

– Temperature not stable – Temper if necessary

Electrode + test sample:

– Conductivity too low

– Use suitable electrode

(e.g. in ultrapure water)

– Temperature too high – Use suitable electrode

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– Organic liquids – Use suitable electrode

What to do if... pHotoFlex / pHotoFlex Turb

Obviously incorrect

measured values

Sensor symbol flashes

Cause Remedy

pH electrode:

– Not connected – Connect electrode

– Cable broken – Replace cable or electrode

– pH electrode unsuitable – Use suitable electrode

– Temperature difference

between buffer and test

– Adjust temperature of buffer

or sample solutions

sample too high

– Measurement procedure not

– Follow special procedure

suitable

Cause Remedy

– Calibration interval expired – Recalibrate the measuring

system

Error message

Measured values

obviously incorrect

Measured value display

< 0.01 FNU

6.4 Turbidity

Cause Remedy

– Cell not correctly inserted – Lock cell into place

– Cell contaminated – Clean the cell

– Calibration too old – Carry out calibration

Cause Remedy

– Measured value outside the

measuring range

– not possible

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pHotoFlex / pHotoFlex Turb Technical data

7 Technical data

7.1 General data

7.1.1 pHotoFlex (Turb)

Dimensions approx. 236 x 86 x 117 mm

Weight approx. 0.6 kg (without batteries)

Mechanical structure Type of protection IP 67

Electrical safety Protective class III

Test certificates cETLus, CE, FCC

Storage - 25 °C ... + 65 °C

Ambient conditions

Operation 0 °C ... + 50 °C

Climatic class 2

Allowable relative

humidity

Power

supply

Yearly mean: 30 days /year: other days:

Batteries 4 x 1.5 V, type AA

Operating time with battery operation

Accumulator pack (optional)

Power pack Charging device (optional)

75 % 95 % 85%

approx. 5000 measurements

5 x 1.2 V nickel metal hydride (NiMH), type AA

FRIWO FW7555M/09, 15.1432.500-00 Friwo Part. No. 1883259 Input: 100 ... 240 V ~ / 50 ... 60 Hz / 400 mA Output: 9 V = / 1,5 A Connection max. overvoltage category II

Primary plugs contained in the scope of delivery: Euro, US, UK and Australian.

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Technical data pHotoFlex / pHotoFlex Turb

Serial

interface

Guidelines

and norms used

Connection of the cable AK 540/B or AK 540/S

Baud rate adjustable:

1200, 2400, 4800, 9600, 19200 Baud

Type RS232

Data bits 8

Stop bits 2

Parity None

Handshake RTS/CTS

Cable length max. 15 m

EMC EC guideline 89/336/EEC

EN 61326-1/A3:2003 FCC Class A

Instrument safety EEC guideline 73/23/EEC

EN 61010-1 :2001 UL3101-1 CAN/CSA-C22.2 No. 1010.1-92

Climatic class VDI/VDE 3540

IP 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.

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pHotoFlex / pHotoFlex Turb Technical data

7.1.2 LabStation

Dimensions approx. 236 x 82 x 170 mm

Weight approx. 0.6 kg

7.2 Photometry

Optical measuring prin-

LED photometer with filter

ciple

Interference filter 436 nm, 517 nm, 557 nm, 594 nm, 610 nm, 690 nm

Accuracy: ± 2 nm

Photometric

0.005 or better

reproducibility

Photometric resolution 0.001

Warm-up time none

Measuring time approx. 2s

Measured parameters Concentration (method dependent, selectable display form),

absorbance, transmission

Measuring range Absorbance: -0.200 ... +2.000

Transmission: 1 ... 150 %

User-defined programs 100

Resolution

1.00 ... 9.99 0,01 %

Transmission

10.0 ... 150 ± 0.1

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Technical data pHotoFlex / pHotoFlex Turb

7.3 pH value / ORP voltage

Measuring ranges,

resolution

Variable Measuring range Resolution

pH - 2.00 ... + 16.00 0.01

U [mV] - 1000 ... + 1000 1

T [°C] - 5.0 ... + 100.0 0.1

T [°F] - 23.0 ... + 212.0 0.1

Manual

temperature input

Variable Range Increment

[°C] - 20 ... + 100 1

manual

Accuracy (± 1 digit) Variable Accuracy Temperature of the test

sample

pH * ± 0.01 + 15 °C ... + 35 °C

U [mV] ± 1 + 15 °C ... + 35 °C

T [°C] ± 0.3 0 °C ... + 55 °C

T [°F] ± 0.54 0 °C ... + 55 °C

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

7.4 Turbidity

Measuring principle Nephelometric measurement according to DIN EN ISO 7027

Light source Infrared LED

Measuring range 0.01 ... 1100 NTU/FNU

Resolution in the range

0.01 ... 9.99

in the range

10.0 ... 99.9

in the range 100 ... 1100

Accuracy in the range

0 ... 1000 NTU/FNU

Measuring time 4 seconds

Calibration Automatic 3-point calibration

max 0.01 NTU/FNU

max 0.1 NTU/FNU

max 1 NTU/FNU

± 2% of the measured value or ± 0.01 NTU/FNU

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pHotoFlex / pHotoFlex Turb Accessories, options

8 Accessories, options

8.1 WTW accessories

Description Model Order no.

LabStation pHotoFlex LS 251 301

Accumulator with pHotoFlex

pHotoFlex BB 251 300

power pack

3 empty cuvettes, 28 x 60 mm LKS28-Set 251 302

Calibration standard kit for

Kal.Kit Turb 430 IR 600 560

Turb 430 IR/pHotoFlex Turb

Thermoprinter

Needle printer

P3001 250 045

LQ 300+ 250 046

16 mm empty cell RK 14/25 250 621

* a connection cable is required to connect the printer (see

section 8.1.1)

8.1.1 Connection cable:

PC You can connect a PC to the pHotoFlex (Turb) in one of the following

ways:

Description Model Order

no.

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! Connection PC - pHotoFlex (Turb)

– Cable AK 540/B 902 842

+ USB adapter

Ada USB 902 881

(for USB connection on PC)

! Connection PC - LabStation

– Zero modem cable AK Labor 902 758

+ USB adapter

Ada USB 902 881

(for USB connection on PC)

Accessories, options pHotoFlex / pHotoFlex Turb

Thermoprinter

You can connect the P3001 to the pHotoFlex (Turb) in the following ways:

Description Model Order

no.

! Connection P3001 - pHotoFlex (Turb)

– Cable AK 540/S 902 843

! Connection P3001 - LabStation

– Cable AK 3000 250 745

in conjunction with an adapter

Specialist shops

(socket - socket) [GenderChanger]

or:

– Cable, 2 x 9-pin (socket - plug) Specialist shops

Needle printer You can connect an LQ300 needle printer to the pHotoFlex (Turb) in

one of the following ways:

Description Model Order

no.

! Connection LQ300 - pHotoFlex (Turb)

– Cable AK 540/B 902 842

with adapter

Specialist shops

9-pin (plug) - 25-pin (plug)

! Connection LQ300 - LabStation

– Cable AK/LQ300 250 746

in conjunction with an adapter

Specialist shops

(socket - socket) [GenderChanger]

or:

– Zero modem cable,

Specialist shops

9-pin (socket) - 25-pin (plug)

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pHotoFlex / pHotoFlex Turb Accessories, options

8.2 Optional extensions of the pHotoFlex (Turb)

The following optional extensions are available in specialist shops:

Device/cable Model

Barcode reader

! Handscanner

Datalogic DLC6065-M1

! Handscanner

Datalogic Touch65

Connection cable

Datalogic CAB-350

Barcode reader - LabStation

* In addition to the barcode reader, a suitable connection cable is

required to operate the barcode reader

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Accessories, options pHotoFlex / pHotoFlex Turb

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pHotoFlex / pHotoFlex Turb Lists

9Lists

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.

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Lists pHotoFlex / pHotoFlex Turb

Abbreviations

°C Temperature unit, degrees Celsius

°F Temperature unit, degrees Fahrenheit

Asy Asymmetry

Cal Calibration

dDay

h Hour

j Year

K Temperature unit, Kelvin

LoBat Batteries almost empty (Low battery)

mMonth

mV Voltage unit

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

NIST/DIN Automatic pH calibration with buffer solutions pre-

pared according to NIST or DIN 19 266

pH pH value

s Second

S Slope (internat. k)

SELV Safety Extra Low Voltage

Slp. Slope determined with calibration

TEC Automatic pH calibration with WTW technical buff-

er solutions according to DIN 19267

U Voltage

100

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Xylem pHotoFlex, pHotoFlex Turb User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

1Overview

1.1 General features

1.2 Keypad

1.3 Display

1.4 Socket field

1.5 LabStation (optional)

2 Safety

2.1 Authorized use

2.2 General safety instructions

3 Commissioning

3.1 Scope of delivery

3.2 Power supply

3.3 Connecting the LabStation

3.4 Initial commissioning

4 Operation

4.1 Switching on the meter

4.2 Inserting a cell

4.3 General operating principles

4.3.1 Operating modes

4.3.2 Navigation

4.3.3 Navigation example 1: Setting the language

4.3.4 Navigation example 2: Setting the date and time

4.3.5 Menu overview

4.4 System settings (System menu)

4.4.1 Measured value memory

4.4.2 Display

4.4.3 Interface

4.4.4 Date/time

4.5 Photometry

4.5.1 General information

4.5.2 Settings for photometric measurements

4.5.3 Measuring the concentration

4.5.4 Blank value (reagent blank value)

4.5.5 Measuring the absorbance/transmission

4.5.6 Zero adjustment

4.5.7 Programs

4.5.8 Analysis timer

4.5.9 Timer

4.5.10 Measuring diluted samples

4.6 pH value / ORP voltage

4.6.1 General information

4.6.2 Measuring the pH value

4.6.3 Measuring the ORP voltage

4.6.4 Settings for pH and ORP measurements

4.6.5 Calibration

4.6.6 Carrying out the TEC and NIST/DIN calibration procedures

4.7 Turbidity

4.7.1 General information

4.7.2 Aligning and marking a cell

4.7.3 Measuring turbidity

4.7.4 Calibration

4.8 Storing

4.8.1 Storing measurement datsets

4.8.2 Filtering measurement datsets

4.8.3 Displaying measurement datsets

4.8.4 Downloading the measurement datsets to the RS232 interface

4.8.5 Erasing stored measurement datasets

4.9 Transmitting data (RS 232 interface)

4.9.1 Connecting a PC/external printer

4.9.2 Configuring the RS232 interface

4.9.3 Selecting the output format of datasets

4.9.4 Transmitting data

4.10 Reset

4.10.1 Resetting the system settings

4.10.2 Resetting the photometer settings

4.10.3 Resetting the pH settings

4.11 Meter information

4.12 Software update

4.13 Administrating user-defined methods

5 Maintenance, cleaning, disposal

5.1 Maintenance

5.1.1 Inserting/exchanging the batteries

5.1.2 Retrofitting the accumulator pack

5.2 Cleaning

5.2.1 Cleaning the cell shaft

5.2.2 Cleaning the cells