Xylem Lab 850 User Manual

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Lab 850

Operating manual

Lab 850

Laboratory pH meter

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DRAFT:February 6, 2006

Lab 850

Accuracy when

going to press

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

The use of advanced technology and the high quality standard of our instruments are the result of continuous development. This may result in differences between this operating manual and your instrument. Also, we cannot guarantee that there are absolutely no errors in this manual. Therefore, we are sure you will understand that we cannot accept any legal claims resulting from the data, figures or descriptions.

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

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

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

Reprinting - even in the form of excerpts - is only allowed with the explicit written authorization of SCHOTT Instruments. Printed in Germany.

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Lab 850

KONFORMITÄTSERKLÄRUNG DECLARATION OF CONFORMITY DÉCLARATION DE CONFORMITÉ

Wir erklären in alleiniger

Verantwortung, dass das

Produkt

pH-Meter

Lab 850

auf das sich diese Erklärung

bezieht, übereinstimmt mit

den Angaben im Kapitel

We declare under our sole

responsibility that the

product

pH meter

Lab 850

to which this declaration

relates is in conformity with

the specifications in the

chapter

Technische Daten

pH-Meter

30. Oktober 2005

Lab 850

Nous déclarons sous notre seule responsabilité que le

produit

pH-mètre

Lab 850

auquel se réfère cette

déclaration est conforme aux

indications du chapitre

30. Oktober, October 30, 30 octobre 2005 AGQSF 0000-A100-00/051030

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SCHOTT Instruments GmbH

Hattenbergstr. 10

D-55122 Mainz

Deutschland, Germany, Allemagne

Lab 850

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Lab 850 Contents

Lab 850 - Contents

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

1.1 Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

1.2 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

1.3 Socket field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

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

2.1 Authorized use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

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

3 Commissioning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

3.1 Scope of delivery. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

3.2 Initial commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

3.2.1 Z865 stand (S4D). . . . . . . . . . . . . . . . . . . . . . . . 16

4 Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

4.1 Switching on the meter . . . . . . . . . . . . . . . . . . . . . . . . . . 17

4.2 General operating principles . . . . . . . . . . . . . . . . . . . . . . 18

4.2.1 Operating modes . . . . . . . . . . . . . . . . . . . . . . . . 18

4.2.2 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

4.3 Measuring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

4.3.1 Measuring the pH value . . . . . . . . . . . . . . . . . . . 20

4.3.2 Measuring the ORP . . . . . . . . . . . . . . . . . . . . . . 21

4.4 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

4.4.1 Calibration interval (Int.C) . . . . . . . . . . . . . . . . . 26

4.4.2 Automatic calibration (AutoCal) . . . . . . . . . . . . . 27

4.4.3 Downloading calibration data . . . . . . . . . . . . . . . 30

4.5 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

4.5.1 System settings . . . . . . . . . . . . . . . . . . . . . . . . . 32

4.5.2 Measurement settings . . . . . . . . . . . . . . . . . . . . 34

4.6 Reset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

4.6.1 Resetting calibration values . . . . . . . . . . . . . . . . 38

4.6.2 Resetting all meter settings . . . . . . . . . . . . . . . . 39

5 Maintenance, cleaning, disposal. . . . . . . . . . . . . . . . . 41

5.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

5.1.1 Replacing the batteries . . . . . . . . . . . . . . . . . . . 41

5.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

5.3 Packing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

5.4 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

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Contents Lab 850

6 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

7 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

7.1 General data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

7.2 Measuring ranges, resolution, accuracy . . . . . . . . . . . . . 49

8 Lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

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Lab 850 Overview

1Overview

The compact Lab 850 precision pH meter enables you to perform pH measurements rapidly and reliably. The Lab 850 provides the maximum degree of operating comfort, reliability and measuring certainty for all applications. The proven calibration procedures and special stability control function (SC) support your work with the pH meter.

1 Keypad

2 Display

3 Socket field

Note

The meter is also available as part of individual Sets of equipment. You will find information on this and other accessories in the SCHOTT Instruments laboratory catalog or via the Internet.

Note

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

! Application reports

! pH primers

! Safety datasheets.

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Overview Lab 850

1.1 Keypad

In this operating manual, keys are indicated by brackets <..> . The key symbol (e.g. <OK>) indicates a keystroke in this operating manual.

MODE

CAL

<On/Off>: <On/Off

<MODE>: <MODE

<CAL>: <CAL

<SC>: Activate / deactivate stability control

<▲>: Increment values, scroll

<▼>: Decrement values, scroll

_>:

Switch meter on / off Reset calibration values

Select measured parameter Open setting menu for calibration and measurement

Call up calibration procedure Display calibration data

<OK>:

_>:

<OK

Confirm entries Open setting menu for system settings

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Lab 850 Overview

1.2 Display

Status display indicator

CalClock (calibration interval and sensor evaluation)

Measured value display

Function and temperature display indicator

Time

Day.Month

Year

LoBat

SET

AutoCal

U pH

Baud

No.

Ident

Auto

BUFFER

Store

CalError

% mV/pH

°F

RCL

Function display

indicators

SET During calibration: number of the buffer set

BUFFER During calibration: number of the buffer

AutoCal Calibration with automatic buffer recognition

CalError An error occurred during calibration

LoBat With battery operation: batteries almost empty

SC Stability control is active

TP Temperature measurement active

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Overview Lab 850

1.3 Socket field

Connectors:

1 pH electrode

2 Reference electrode

3 Temperature sensor

4 Power pack

5 Service interface

Caution

Only connect sensors to the meter that cannot return any voltages or currents that are not allowed (> SELV and > current circuit with current limiting). Almost all sensors - in particular SCHOTT Instruments sensors fulfill these conditions.

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Lab 850 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 before working with the meter. The operating manual must always be available within the vicinity of the instrument.

Target group The meter was developed for work in the laboratory.

Thus, we assume that, as a result of their professional training and experience, the operators will know the necessary safety precautions to take when handling chemicals.

Safety instructions Safety instructions in this operating manual are indicated by the

warning symbol (triangle) in the left column. The signal word (e.g. "Caution") indicates the level of danger:

Further notes

Warning

indicates instructions that must be followed precisely in order to avoid possibly great dangers to personnel.

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.

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 Lab 850

2.1 Authorized use

This meter is authorized exclusively for pH and ORP measurements in the laboratory. The technical specifications as given in chapter 7 T

ECHNICAL DATA

(page 47) 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 unauthorized.

2.2 General safety instructions

This instrument is constructed and tested in compliance with the IEC 1010 safety regulations for electronic measuring instruments. It left the factory in a safe and secure technical condition.

Function and

operational safety

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.

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 (page 47).

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.

Caution

The meter is only allowed to be opened by personnel authorized by SCHOTT Instruments.

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Lab 850 Safety

Safe operation 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

! no longer operates as described in this manual.

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

Obligations of the

purchaser

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 Lab 850

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Lab 850 Commissioning

3 Commissioning

3.1 Scope of delivery

! Lab 850 laboratory meter

! Power pack

! 4 batteries 1.5 V Mignon type AA

! Transparent cover

! Stand with stand base (S4D)

! Operating manual

! CD-ROM

3.2 Initial commissioning

Switching on the meter

Setting the date and

time

Connecting the power

pack

Perform the following activities:

! Switch on the meter

! Set the date and time

! Connect the power pack (for line power operation only).

1 Switch on the meter with <On/Off>.

A display test is briefly displayed.

2 See page 32.

Caution

The line voltage at the operating site must lie within the input voltage range of the original power pack (see page 47).

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Caution

Use original power packs only (see page 47).

3 Insert the plug into the socket of the pH meter.

4 Connect the original power pack to an easily accessible power

outlet.

Commissioning Lab 850

Note

You can carry out measurements without the power pack.

3.2.1 Z865 stand (S4D)

The meter can be inserted in the stand base on the right or left side of the electrode holder.

1 Insert the stand rod in the stand base.

2 Insert the meter in the stand base.

An arrangement of meter with stand looks, for example, as follows:

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Lab 850 Operation

4 Operation

4.1 Switching on the meter

1 Place the meter on a flat surface and protect it from intense

light and heat.

2 Press the <On/Off>

A display test is briefly displayed. Subsequently, the meter switches to the measuring mode (measured value display).

Note

The meter has an energy saving feature to avoid unnecessary battery depletion during battery operation. The energy saving feature switches off the meter if no key was pressed during the specified interval (setting the switch-off interval, see page 32).

key.

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Operation Lab 850

4.2 General operating principles

This section contains basic information on the operation of the Lab 850.

4.2.1 Operating modes

The instrument has the following operating modes:

! Measurement

The display indicates the measurement data in the measured value display

! Calibration

The display guides you thru a calibration procedure with calibration information

! Configuration

The system menu or a sensor menu with submenus, settings and functions is displayed

4.2.2 Operation

Keys The meter is operated via keys. The keys can have different functions

with long or short keystrokes.

Functions Generally, with a short keystroke a function is carried out. A long

keystroke opens a setting menu.

In a setting menu, settings are selected with the <▲><▼> keys. A setting is confirmed with <OK>. With confirming, the setting is finished and the next setting is displayed.

Representation In this operating manual, keys are indicated by brackets <..> .

The key symbol (e.g. <OK>) generally indicates a short keystroke (under 2 sec) in this operating manual. A long keystroke (approx. 2 sec) is indicated by the underscore behind the key symbol (e.g.

<OK

_>).

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Lab 850 Operation

4.3 Measuring

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

1 Connect an electrode to the meter.

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

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

3 Calibrate or check the meter with the electrode.

4 Select the measured parameter with <MODE>.

Note

Incorrect calibration of pH electrodes leads to incorrect measured values. Calibrate regularly before measuring.

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 sensor You can measure with or without a temperature sensor. If a

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

Note

The pH meter automatically recognizes the type of the temperature sensor used. Therefore, you can connect electrodes with an NTC30 or Pt1000.

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

1 Measure the current temperature using a thermometer.

2 Set the temperature value with <▲><▼>.

Note

When calibrating without temperature sensor, also set the current temperature of each buffer solution manually (see <▲><▼>).

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Operation Lab 850

4.3.1 Measuring the pH value

1 Perform the preparatory activities according to page 19.

2 Immerse the pH electrode in the test sample.

3 Using <MODE>, scroll as necessary until the measured

parameter pH is displayed.

Stability control SC

(drift control)

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

For identical measurement conditions, the following criteria apply:

Drift within 15 sec < 0.02 pH units.

1 If necessary, call up the measured variable pH with <MODE>.

2With <SC>, activate the stability control function.

The SC function display indicator appears. The current measured value is frozen (hold function).

3 Start measurement with stability control with <OK>.

SC flashes until a stable measured value is reached. This measured value is downloaded to the interface.

4 If necessary, start the next measurement with stability control

with <OK>.

5 To terminate the stability control function: Press the <MODE>

or <SC>

Note

The current measurement with stability control can be terminated at any time (accepting the current value) by pressing <OK>.

key.

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Lab 850 Operation

4.3.2 Measuring the ORP

The meter can, in conjunction with an ORP electrode, measure the ORP (mV) of a solution.

1 Perform the preparatory activities according to page 19.

2 Immerse the ORP electrode in the test sample.

3 If necessary, call up the measured parameter U with <MODE>.

4 Wait for a stable measured value.

Note

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

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Operation Lab 850

4.4 Calibration

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

of the pH electrode. As a result, an inexact measured value is displayed. Calibration determines the current values of the zero point and slope of the electrode and stores them. Thus, you should calibrate at regular intervals. The calibration data is stored in the meter.

When do you have to

calibrate?

Buffer sets for

calibration

! After connecting another electrode

! When the CalClock on the display flashes:

– after the calibration interval has expired

– after a voltage interruption (empty batteries)

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.

No. Buffer set* pH values at

1 SCHOTT Instruments DIN buffers

according to DIN 19266/NBS

1.679

4.006

25 °C

6.865

9.180

12.454

2 SCHOTT Instruments Technical

buffers according to DIN 19267

2.000

4.010

25 °C

7.000

10.011

3 Merck1* 4.000

7.000

9.000

4 Merck2 * 1.000

6.000

8.000

13.000

5 Merck3 * 4.660

6.880

9.220

6 DIN 19267 * 1.090

4.650

6.790

9.230

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20°C

25 °C

Lab 850 Operation

No. Buffer set* pH values at

7 Mettler Toledo USA * 1.679

4.003

7.002

10.013

8 Mettler Toledo TEC * 1.995

4.005

7.002

9.208

9 Fisher * 2.007

4.002

7.004

10.002

10 Fluka BS * 4.006

6.984

8.957

11 Radiometer * 1.678

4.005

7.000

9.180

12 Baker * 4.006

6.991

10.008

25 °C

13 Metrohm * 3.996

25 °C

7.003

8.999

14 Beckman * 4.005

25 °C

7.005

10.013

15 Hamilton Duracal * 4.005

25 °C

7.002

10.013

16 Precisa * 3.996

25 °C

7.003

8.999

* Brand names or trade names are trademarks of their respective

owners protected by law (see page 55).

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Operation Lab 850

Note

The buffer set is selected in the menu for measurement settings (see page 34).

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

Displayed calibration data

values

1-point ASY ! Zero point = ASY

! Slope = Nernst slope

(-59.16 mV/pH at 25 °C)

2-point ASY

SLO

3-point ASY

SLO

! Zero point = ASY

! Slope = SLO

! Zero point = ASY

! Slope = SLO

The calibration line is calculated by linear regression.

Note

You can display the slope in the units, mV/pH or %. You can display the zero point in the units, mV or pH.

AutoCal is adapted to the permanently programmed buffer solutions as a fully

automatic two-point or three-point calibration. The buffer solutions are automatically recognized by the meter.

Stability control The calibration procedure automatically activates the stability control

function. The current measurement with stability control can be terminated at any time (accepting the current value) by pressing <OK>.

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

displayed as an informative message and stored. )

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Lab 850 Operation

Displaying the

You can display the data of the last calibration (see page 30).

calibration data

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

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

CalClock Zero point

[mV]

Slope [mV/pH]

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

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

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

-57 ... -56

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

-56 ... -50

Preparatory activities

Clean the electrode according to the sensor operating manual

CalError

< -30 or > 30

... -62 or ... -50

Eliminate the error according to chapter 6 W

HAT TO DO IF...

(page 43)

1 Switch on the meter with <On/Off>.

2 Connect a pH electrode to the meter.

3 Keep the buffer solutions ready.

4 Adjust the temperature of the solutions and measure the

current temperature if the measurement is made without temperature sensor.

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5 Set the buffer set to be used for calibration as necessary.

Operation Lab 850

4.4.1 Calibration interval (Int.C)

The calibration interval and calibration evaluation are indicated on the display as the CalClock.

CalClock

The remaining time of the calibration interval is indicated by the segmented ring around the calibration evaluation. This segmented ring reminds you to calibrate regularly.

After the specified calibration interval (Int.C) has expired, the outer ring of the CalClock flashes. It is still possible to measure.

Note

To ensure the high measuring accuracy of the meter, calibrate after the calibration interval has expired.

Setting the calibration

interval

The calibration interval (Int.C) is set to 7 days (d7) in the factory. You can change the interval (1 ... 999 days):

1 Open the menu for measurement settings with <MODE_>.

2 Confirm all settings with <OK> until Int.C is displayed.

Time

3 Set the calibration interval with <▲><▼>.

4 Confirm the setting with <OK>.

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Lab 850 Operation

4.4.2 Automatic calibration (AutoCal)

For this procedure, use two or three buffer solutions of the selected buffer set in any order.

Note

The steps 2, 6 and 10 are not necessary if you use a temperature sensor.

1 Start the calibration with <CAL>.

The number of the specified buffer set is displayed (SET 1 ...

16). The first buffer (BUFFER 1) of the buffer set (SET_x) is requested.

BUFFER

SET

AutoCal

2 If necessary, set the temperature of the buffer solution with

<▲><▼>.

3 Immerse the pH electrode in the first buffer solution.

4 Start the measurement with <OK>.

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Operation Lab 850

Continue with two-point

calibration

BUFFER

SET

AutoCal

Note

Here you can cancel the calibration procedure with <MODE>. This corresponds to a single-point calibration. The value of the zero point (Asy) is displayed for 10 seconds, then the value of the slope (Slo) is displayed for 10 seconds. After this the meter switches to the measuring mode.

5 Thoroughly rinse the electrode with distilled water.

6 If necessary, set the temperature of the second buffer solution

with <▲><▼>.

7 Immerse the pH electrode in the second buffer solution.

8 Start the measurement with <OK>.

Buffer

SET

AutoCal

DIN

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Lab 850 Operation

Note

Here you can cancel the calibration procedure with <MODE>. This corresponds to a two-point calibration. The value of the zero point (Asy) is displayed for 10 seconds, then the value of the slope (Slo) is displayed for 10 seconds. After this the meter switches to the measuring mode.

Continue with three-

point calibration

9 Thoroughly rinse the electrode with distilled water.

10 If necessary, set the temperature of the third buffer solution

with <▲><▼>.

11 Immerse the pH electrode in the third buffer solution.

12 Press the <OK>

The SC display indicator flashes. Depending on the setting, the display shows the nominal pH value for the recognized buffer or the electrode voltage (mV). As soon as a stable value is recognized, the value of the zero point (ASY) is displayed for 10 seconds, then the value of the slope (SLO) is displayed for 10 seconds. After this the meter switches to the measuring mode.

Note

While the zero point (ASY) is being displayed, you can change the unit of the zero point with

While the slope (SLO) is being displayed, you can change the unit of the slope with The % display refers to the Nernst slope of 59.2 mV/pH at 25° C (100 x determined slope/Nernst slope).

<▲><▼> .

key.

<▲><▼> .

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The unit of zero point and slope can be permanently changed in the measurement settings (see page 34).

Operation Lab 850

4.4.3 Downloading calibration data

1 Press <CAL_> to display the calibration data.

The following data is displayed consecutively for 10 seconds each: date, zero point, slope.

While the calibration data is being displayed, you can:

! press <OK> to display further calibration data

(date, zero point, slope)

! press

<▲><▼>

! press

<▲><▼>

to switch over the unit of the zero point (Asy) (while the zero point is being displayed)

to switch over the unit of the slope (Slo) (while the slope is being displayed)

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Lab 850 Operation

4.5 Settings

You can adapt the meter to your individual requirements. The settings are done in the following menus:

! System settings (<OK

– Switch-off interval (t.Off)

– Date (Day.Month)

– Date (Year)

– Time (Time)

! Settings for calibration and measurement (<MODE

– Number of the buffer set for pH calibration (Set 1 ... 16)

– Display of the buffer during calibration

(pH nominal value or measured voltage value in mV)

– Unit of the value for the slope (mV/pH or %)

– Unit of the value for the zero point (mV, pH)

– Resolution (Hi, Lo)

– Temperature unit (°C / °F)

– Calibration interval (Int.C [0 ... 999])

Note

You can exit the setting menu at any time by pressing <MODE>. Settings already modified and confirmed with <OK> are stored.

_>)

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Operation Lab 850

4.5.1 System settings

The default setting is printed in bold.

Switch-off interval (t.Off) 10, 20, 30, 40, 50 min,

1, 2, 3, 4, 5, 10, 15, 20, 24 h

Date (Day.Month)Any

Date (Year) Any

Time (Time)Any

1 Open the menu for system settings with <OK_>.

The first system setting is displayed.

Switch-off interval

(t.OFF)

Date and time

Time

2 Set the switch-off interval with <▲><▼>.

3 Confirm with <OK>.

Day.Month, the setting of the date is displayed. The day display flashes.

Day.Month

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Lab 850 Operation

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

5 Confirm with <OK>.

The month display flashes.

6 Set the current month with <▲><▼> .

7 Confirm with <OK>.

Year, the setting of the year is displayed.

8 Set the year with <▲><▼> .

9 Confirm with <OK>.

The setting of the time is displayed. The hour display flashes.

10 Set the current hour with <▲><▼> .

11 Confirm with <OK>.

The minute display flashes.

12 Set the current minute with <▲><▼> .

13 Confirm with <OK>.

The system settings are completed. The meter switches to the measuring mode.

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Operation Lab 850

4.5.2 Measurement settings

These settings apply to calibration and measurement (the default setting is printed in bold).

Number of the buffer set for pH calibration (SET)

Display during calibration (BUFFER) pH (buffer nominal value),

1 ... 16

U (electrode voltage)

Buffer set for pH

calibration

(SET)

Unit of the value for the zero point (ASY)

Unit of the value for the slope (SLO) %, mV/pH

Temperature unit (UnIt) °C, °F

Calibration interval (Int.C) 0 ... 7 ... 999 d

1 Open the menu for measurement settings with <MODE_>.

Set 1 ... 16, the specified buffer set is displayed.

SET

pH, mV

AutoCal

2 Using <▲><▼>, select a buffer set Set 1 ... 16.

3 Confirm with <OK>.

bUFF, the setting of the display during calibration is displayed.

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Lab 850 Operation

Display during

calibration

(bUFF)

Unit of the value for the

slope (SLO)

mV/pH

AutoCal

4 Using <▲><▼>, select the display during calibration pH or U.

5 Confirm with <OK>.

SLO, the unit of the value for the slope (mV/pH or %) is displayed.

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6 Using <▲><▼>, select the unit for the slope.

7 Confirm with <OK>.

ASY, the unit of the value for the zero point (mV or pH) is displayed.

Operation Lab 850

Unit of the value for the

zero point (ASY)

8 Using <▲><▼>, select the unit for the zero point.

9 Confirm with <OK>.

rES, the setting of the resolution is displayed.

Resolution

(rES)

10 Using <▲><▼>, toggle between Hi and Lo.

11 Confirm with <OK>.

Unit, the setting of the unit of the temperature value is displayed.

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Lab 850 Operation

Temperature unit (Unit)

Calibration

interval

(Int.C)

12 Using <▲><▼>, toggle between °C and °F.

13 Confirm with <OK>.

Int.C, the setting of the calibration interval is displayed.

Time

AutoCal

14 Set the interval with <▲><▼>.

15 Confirm with <OK>.

The measurement settings are completed. The meter switches to the measuring mode.

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Operation Lab 850

4.6 Reset

4.6.1 Resetting calibration values

This function resets the calibration values to the default condition. All other meter settings are retained.

Calibration values in the

default condition

Resetting calibration

values

Zero point pH 7.000 (0 mV)

Slope 100 % (-59.16 mV/pH)

Note

The measuring system is not calibrated after a reset. Before measuring recalibrate the meter.

1 Press <On/Off_> to open the menu for the reset of the

calibration data. Ini.C is displayed.

2 Press <▲><▼> to display no or YES.

YES: Reset the calibration values. no: Retain the calibration values.

3 Confirm with <OK>.

The menu is finished. The meter switches to the measuring mode.

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Lab 850 Operation

4.6.2 Resetting all meter settings

This function resets to the default condition all meter settings including the calibration values. The corresponding values are given on the following pages:

Calibration values page 38

System settings page 32

Measurement settings page 34

Resetting the meter

settings

1 Switch on the meter with <On/Off>.

The display test appears briefly on the display.

2 During the display test, press <MODE> to open the menu for

the reset of the meter settings. Init is displayed.

3 Press <▲><▼> to display no or YES.

YES: Reset the meter settings. no: Retain the meter settings.

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4 Confirm with <OK>.

The menu is finished. The meter switches to the measuring mode.

Note

The measuring system is not calibrated after a reset. Before measuring recalibrate the meter.

Operation Lab 850

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Lab 850 Maintenance, cleaning, disposal

5 Maintenance, cleaning, disposal

5.1 Maintenance

The only maintenance activity required is replacing the batteries.

Note

For maintenance of the electrodes refer to the relevant operating manuals.

5.1.1 Replacing the batteries

1 Open the battery compartment (1) on the underside of the

meter.

2 Remove the four batteries from the battery compartment.

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

compartment.

4 Close the battery compartment (1).

The date (day) flashes in the display.

5 Set the date and time according to page 32.

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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. Only use leakproof alkaline manganese batteries.

Maintenance, cleaning, disposal Lab 850

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 is made of synthetic material (ABS). Thus, avoid contact with acetone or similar detergents that contain solvents. Remove any splashes immediately.

5.3 Packing

This meter is sent out in a protective transport packing. We recommend: Keep the packing material. The original packing protects the instrument against damage during transport.

5.4 Disposal

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

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

Note

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

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Lab 850 What to do if...

6 What to do if...

Error message

Err1

Error message

Err2

Cause Remedy

pH electrode:

– Measured value outside the

measuring range

– Air bubble in front of the

junction

– Air in the junction – Extract air or moisten

– Cable broken – Replace the electrode

– Gel electrolyte dried out – Replace the electrode

Cause Remedy

– No electrode connected – Connect the electrode

– Setting time during calibration

too long

– Use a suitable electrode

– Remove air bubble

junction

– Adjust temperature if

necessary

– Recalibrate

Error message

Err4

Error message

CalError

Cause Remedy

– Temperature not stable during

calibration.

Cause Remedy

pH electrode:

– The values determined for zero

point and slope of the electrode are outside the allowed limits.

– Junction contaminated – Clean junction

– Electrode broken – Replace the electrode

Buffer solutions:

– Adjust temperature if

necessary

– Recalibrate

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What to do if... Lab 850

Cause Remedy

– Incorrect buffer solutions – Change calibration

procedure

– Buffer solutions too old – Use only once.

Note the shelf life

– Buffer solutions depleted – Change solutions

No stable measured

Cause Remedy

value

pH electrode:

– Junction contaminated – Clean junction

– Membrane contaminated – Clean membrane

CalClock expired

Test sample:

– pH value not stable – Measure with air excluded if

necessary

– Temperature not stable – Adjust temperature if

necessary

Electrode + test sample:

– Conductivity too low – Use a suitable electrode

– Temperature too high – Use a suitable electrode

– Organic liquids – Use a suitable electrode

Cause Remedy

– Calibration interval expired – Recalibrate the measuring

system

Display,

LoBat

Cause Remedy

– Batteries almost empty – Replace the batteries (see

page 41)

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Lab 850 What to do if...

Cause Remedy

Obviously incorrect

measured values

pH electrode:

– pH electrode unsuitable – Use a suitable electrode

Instrument does not

react to keystroke

You want to know which

software

version is in the

instrument

– Temperature difference

between buffer and test sample

– Adjust temperature of buffer

or sample solutions

too high

– Measurement procedure not

– Follow special procedure

suitable

Cause Remedy

– Operating condition undefined

or EMC load unallowed

– Processor reset:

Press and hold the <SC> key and switch the meter on

Cause Remedy

– E. g., a question by the service

department

– Switch on the meter.

During the display test, display the software version with <OK>.

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What to do if... Lab 850

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Lab 850 Technical data

Stand October 10, 2005Translation of the legally binding German version

7 Technical data

7.1 General data

Dimensions approx. 240 x 190 x 80 mm

Weight approx. 1.0 kg (without power pack, without stand)

Mechanical structure Type of protection IP 43

Electrical safety Protective class III Test certificates cETLus

Ambient

conditions

Power

supply

Service

interface

Storage - 25 °C ... + 65 °C

Operation 0 °C ... + 55 °C

Climatic class 2

Batteries 4 x 1.5 V alkali-manganese batteries, Type

Operational life Approx. 1000 operating hours

Power pack (charging device)

This interface can be used for service purposes only.

Baud rate 4800 baud

Type RS232, bidirectional

Data bits 8

Stop bits 2

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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Parity None

Handshake RTS/CTS+Xon/Xoff

Technical data Lab 850

Stand October 10, 2005Translation of the legally binding German version

Guidelines

and norms used

EMC EC guideline 89/336/EEC

EN 61326 EN 61000-3-2 EN 61000-3-3 FCC Class A

Instrument safety EC guideline 73/23/EEC

EN 61010-1 ANSI/UL 61010-1 CAN/CSA-C22.2 No. 61010-1

Climatic class VDI/VDE 3540

IP protection EN 60529

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Lab 850 Technical data

Stand October 10, 2005Translation of the legally binding German version

7.2 Measuring ranges, resolution, accuracy

Measuring ranges,

resolution

Variable Measuring range Resolution

pH - 2.000 ... + 19.999

- 2.00 ... + 19.99

U [mV] - 999.9 ... + 999.9

- 2000 ... + 2000

0.001

0.01

0.1 1

T [°C] - 5.0 ... + 120.0 0.1

T [°F] + 23.0 ... + 248.0 0.1

Manual

temperature input

Variable Range Increment

[°C] - 25 ... + 125 1

manual

[°F] - 13 ... + 257 1

manual

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

sample

pH / range *

- 2.000 ... + 19.999 ± 0.005 + 15 °C ... + 35 °C

- 2.00 ... + 19.99 ± 0.01 + 15 °C ... + 35 °C

U [mV] / range

- 999.9 ... + 999.9 ± 0.3 + 15 °C ... + 35 °C

- 2000 ... + 2000 ± 1 + 15 °C ... + 35 °C

T [°C] / temperature sensor

NTC 30 ± 0.1

PT 1000 ± 0.3

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

Note

The accuracy values specified here apply exclusively to the meter. The accuracy of the electrodes and buffer solutions has to be taken into account additionally.

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Technical data Lab 850

Stand October 10, 2005Translation of the legally binding German version

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Lab 850 Lists

8Lists

This chapter provides additional information and orientation aids.

Abbreviations The list of abbreviations explains abbreviations that appear on the

display or when dealing with the instrument.

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

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

Trademarks used The list comprises the trademarks used in the present document and

their owners.

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

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Lists Lab 850

Abbreviations

°C Temperature unit °Celsius

°F Temperature unit, °Fahrenheit

ASY Zero point (asymmetry)

AutoCal Automatic calibration using a selected buffer set

Cal Calibration

CalError Error message (see W

HAT TO DO IF...)

Err1 Overflow

Display range exceeded

Err2, Err4 Error message (see W

HAT TO DO IF...)

InI Initialization

Resets individual basic functions to the status they had on delivery

LoBat Low Battery (batteries almost empty)

mV Voltage unit

mV/pH Unit of the electrode slope

pH pH value

S Slope value

SC Stability control (drift control)

SELV Safety Extra Low Voltage

SLO Slope (slope on calibration)

TP Temperature Probe

Temperature measurement active

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Lab 850 Lists

Glossary

Asymmetry see zero point

Resolution Smallest difference between two measured values that can be

displayed by a meter.

AutoRange Name of the automatic selection of the measuring range.

Junction The junction is a porous body in the housing wall of reference

electrodes or electrolyte bridges. It arranges the electrical contact between two solutions and makes the electrolyte exchange more difficult. The expression, junction, is also used for ground or junctionless transitions.

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

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

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

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

Electromotive force of

an electrode

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

Measured variable The measured parameter is the physical dimension determined by

measuring, e. g. pH, conductivity or DO concentration.

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

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

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

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

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

solvent.

Zero point The zero point of a pH electrode is the pH value at which the

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

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

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

Lists Lab 850

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

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

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

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

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

Stability control Function to control the measured value stability.

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

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

Slope The slope of a linear calibration function.

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Lab 850 Lists

Trademarks used

Trademark Owner of the trademark

Merck Merck KGaA

Mettler Toledo Mettler Toledo

Fisher Fisher Scientific Company

Fluka Fluka AG

Radiometer Radiometer

Baker Mallinckrodt Baker, Inc.

Metrohm Metrohm AG

Beckman Beckman Instruments, Inc.

Hamilton Hamilton Company Corporation

Precisa Precisa Instruments AG

Windows Microsoft Corporation

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Lists Lab 850

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Lab 850 Lists

Index

Authorized use . . . . . . . . . . . . . . . . . . . . . . 12

AutoCal . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

AutoRead . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Battery compartment . . . . . . . . . . . . . . . . . 41

Baud rate setting . . . . . . . . . . . . . . . . . . . . 32

Calibration . . . . . . . . . . . . . . . . . . . . . . . . . 22

Calibration evaluation pH . . . . . . . . . . . . . . 25

Calibration interval . . . . . . . . . . . . . . . . . . . 26

Calibration points pH . . . . . . . . . . . . . . . . . 24

Connect the plug-in power supply unit . . . . 15

Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Drift control . . . . . . . . . . . . . . . . . . . . . . . . . 20

Energy saving feature . . . . . . . . . . . . . . . . 17

Error message . . . . . . . . . . . . . . . . . . . . . . 43

Firmware update . . . . . . . . . . . . . . . . . . . . 59

ORP electrode . . . . . . . . . . . . . . . . . . . . . . 21

ORP voltage . . . . . . . . . . . . . . . . . . . . . . . 21

pH buffer sets . . . . . . . . . . . . . . . . . . . . . . 22

Precautions . . . . . . . . . . . . . . . . . . . . . . . . 11

Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

all meter settings . . . . . . . . . . . . . . . . . 39

Calibration values . . . . . . . . . . . . . . . . 38

Resolution setting . . . . . . . . . . . . . 34, 35, 36

Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Scope of delivery . . . . . . . . . . . . . . . . . . . . 15

Setting the date . . . . . . . . . . . . . . . . . . 15, 32

Setting the time . . . . . . . . . . . . . . . . . . 15, 32

Single-point calibration . . . . . . . . . . . . . . . 28

Slope pH . . . . . . . . . . . . . . . . . . . . . . . 22, 29

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

Temperature sensor . . . . . . . . . . . . . . . . . 19

Three-point calibration . . . . . . . . . . . . . . . . 24

Two-point calibration . . . . . . . . . . . . . . . . . 29

Initial commissioning . . . . . . . . . . . . . . . . . 15

Interval Calibration . . . . . . . . . . . . . . . . . . . 26

Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

LoBat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Measurement accuracy . . . . . . . . . . . . . . . 26

Operation location . . . . . . . . . . . . . . . . . . . 17

Operational safety . . . . . . . . . . . . . . . . . . . 12

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Zero point of the pH electrode . . . . . . . 22, 29

Lists Lab 850

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Lab 850

Appendix: Firmware update

General information With the Update_Labxxx_MxxxP program and a PC you can update

the firmware of the Lab 850 to the newest version.

For the update you need:

! a free RS232 interface on your PC

! the RS232 cable, Z390.

Program installation With the installation program,

"Install_Update_Labxxx_MxxxP_Vx_yy_English.exe", install the firmware update program on your PC.

Program start Start the "Update_Labxxx_MxxxP" program from the Windows start

menu.

You can change the language via the language menu.

Firmware update Proceed as follows:

1 Connect the Lab 850 to a serial interface (COM port) of the PC

with the aid of the interface cable Z390.

2 Make sure the Lab 850 is switched on.

3 To start the update process click the OK button.

The program automatically recognizes the used interface.

4 To go on, follow the instructions of the program.

During the programming process, a corresponding message and a progress bar (in %) appear. The programming process takes approx. two minutes. A terminatory message is displayed after a successful programming process. The firmware update is now completed.

5 Disconnect the meter from the PC.

The instrument is ready for operation.

After switching the meter off and on you can check whether the meter has taken over the new software version (see page 45).

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Lab 850

ba75553e03 01/2006

SCHOTT Instruments GmbH Postfach 2443 D-55014 Mainz Hattenbergstr. 10 D-55122 Mainz

Telefon +49 (0) 61 31/66 5111 Telefax +49 (0) 61 31/66 5001 Internet: www.schottinstruments.com

Xylem Lab 850 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

1Overview

1.1 Keypad

1.2 Display

1.3 Socket field

2 Safety

2.1 Authorized use

2.2 General safety instructions

3 Commissioning

3.1 Scope of delivery

3.2 Initial commissioning

3.2.1 Z865 stand (S4D)

4 Operation

4.1 Switching on the meter

4.2 General operating principles

4.2.1 Operating modes

4.2.2 Operation

4.3 Measuring

4.3.1 Measuring the pH value

4.3.2 Measuring the ORP

4.4 Calibration

4.4.1 Calibration interval (Int.C)

4.4.2 Automatic calibration (AutoCal)

4.4.3 Downloading calibration data

4.5 Settings

4.5.1 System settings

4.5.2 Measurement settings

4.6 Reset

4.6.1 Resetting calibration values

4.6.2 Resetting all meter settings

5 Maintenance, cleaning, disposal

5.1 Maintenance

5.1.1 Replacing the batteries

5.2 Cleaning

5.3 Packing

5.4 Disposal

6 What to do if...

7 Technical data

7.1 General data

7.2 Measuring ranges, resolution, accuracy

8Lists

Appendix: Firmware update