Nova Analytics M 545P Operating manual

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M545P

Operating manual

Pinnacle series

M 545P

Laboratory pH meter

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M 545P

Accuracy when

going to press

Warranty We guarantee the meter described for 3 years from the date of purchase.

The use of advanced technology and the high quality standard of our meters are the result of a continuous development. This may result in differences between this operating manual and your meter. 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.

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

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

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M545P

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M545P

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M 545P Contents

M 545P - 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

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) . . . . . . . . . . . . . . . . . 27

4.4.2 Automatic calibration Automatic Calibration

(AutoCal) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

4.4.3 Conventional calibration (ConCal) . . . . . . . . . . . 31

4.5 Storage in memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

4.5.1 Manual storage . . . . . . . . . . . . . . . . . . . . . . . . . 33

4.5.2 Automatic storage at intervals . . . . . . . . . . . . . . 35

4.5.3 Downloading the data memory . . . . . . . . . . . . . 37

4.5.4 Erasing the data memory . . . . . . . . . . . . . . . . . . 38

4.5.5 Downloading calibration data . . . . . . . . . . . . . . . 38

4.6 Transmitting data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

4.6.1 Options for data transmission . . . . . . . . . . . . . . 41

4.6.2 Automatically downloading measurement datasets

at intervals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

4.6.3 Downloading stored measurement datasets . . . 42

4.6.4 Downloading calibration data . . . . . . . . . . . . . . . 42

4.6.5 RS232 interface . . . . . . . . . . . . . . . . . . . . . . . . . 42

4.7 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

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Contents M 545P

4.7.1 System settings . . . . . . . . . . . . . . . . . . . . . . . . . 45

4.7.2 Measurement settings . . . . . . . . . . . . . . . . . . . . 47

4.7.3 Interval for automatic storing (AutoStore) . . . 51

4.7.4 Interval for automatic data transmission . . . . . . . 52

4.8 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

4.8.1 Resetting calibration values . . . . . . . . . . . . . . . . 53

4.8.2 Resetting meter settings. . . . . . . . . . . . . . . . . . . 54

5 Maintenance, cleaning, disposal . . . . . . . . . . . . . . . . . 55

5.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

5.1.1 Replacing the batteries. . . . . . . . . . . . . . . . . . . . 55

5.2 Cleaning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

5.3 Packing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

6 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

7 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

7.1 General data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

7.2 Measuring ranges, resolution, accuracy . . . . . . . . . . . . . 63

8 Lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

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M 545P Overview

1Overview

The compact M 545P precision pH meter enables you to perform pH measurements rapidly and reliably. The M 545P provides the maximum degree of operating comfort, reliability and measuring certainty for all applications. The proven calibration procedures and special AutoRead function (AR) support your work with the pH meter.

Pinnacle series

1 Keypad

2 Display

3 Socket field

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Overview M 545P

STO

1.1 Keypad

Pinnacle series

_>:

CAL

RCL

Switch the measuring instrument on/off Call up calibration data

Select measured parameter Open setting menu for calibration and measurement

Call up calibration procedure Call up initialization

MODE AR

STO

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

_>).

<On/Off>: <On/ Off

_>:

<MODE>:

MODE

CAL

<MODE >:

<CAL>: <CAL

<AR>:

_>:

STO

RCL

<AR

<STO>:

_>:

<STO

<RCL>:

<RCL

_>:

<▲>: Increment values, scroll

Activate / deactivate AutoRead Set the interval for data transmission

Store measured value Set the interval for automatic storing processes

Display / transmit measured values and calibration records Erase stored measured values

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M 545P Overview

<▼>: Decrement values, scroll

Function display

indicators

<OK>:

_>:

<OK

1.2 Display

SET

Time

Day.Month

Year

AutoCal

LoBat

DIN

SET During calibration: number of the buffer set

BUFFER During calibration: number of the buffer

U pH

Baud

No.

Ident

Auto

BUFFER

Store

Confirm entries Open setting menu for system settings

Status display

Sensor symbol

CalError

ARConCal

% mV/pH

°F

RCL

Measured value display

Function and temperature display indicators

AutoCal Calibration with automatic buffer recognition

AutoStore Automatic storing is switched on

CalError An error occurred during calibration

LoBat With battery operation: batteries almost empty

AR AutoRead is active

RCL Memory display / memory download

TP Temperature measurement active

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Overview M 545P

1.3 Socket field

Connectors:

1 pH electrode

2 Reference electrode

3 Temperature sensor

4 Power pack

5 RS 232 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 customary sensors fulfill these conditions.

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M 545P 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 meter.

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 meter 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 M 545P

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 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 meter 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.

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

Caution

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

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M 545P Safety

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

service and secured against inadvertent operation! Safe operation is no longer possible if the meter:

z has been damaged in transport

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

time

z is visibly damaged

z no longer operates as described in this manual.

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

Obligations of the

purchaser

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

z EEC directives for protective labor legislation

z National protective labor legislation

z Safety regulations

z Safety datasheets of the chemical manufacturers.

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Safety M 545P

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M 545P Commissioning

3 Commissioning

3.1 Scope of delivery

z M 545P laboratory meter

z Power pack

z 4 batteries 1.5 V Mignon type AA

z Stand with stand base

z Operating manual

3.2 Initial commissioning

Perform the following activities:

z Switch on the meter

Switching on the meter

Setting the date and

time

Connecting the power

pack

z Set the date and time

z 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 section 4.7.1

Caution

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

DATA).

ECHNICAL

Caution

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

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

4 Connect the original power pack to an easily accessible power

outlet.

Note

You can carry out measurements without the power pack.

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Commissioning M 545P

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M 545P 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 section

4.7.1). The energy saving feature is not active:

z if the power is supplied by the power pack

z if the AutoStore function is active (see section 4.5.2)

z if a PC is connected (with communication cable to RS232 interface)

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

key.

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Operation M 545P

4.2 General operating principles

This section contains basic information on the operation of the M 545P.

4.2.1 Operating modes

The meter has the following operating modes:

z Measurement

The display indicates the measurement data in the measured value display

z Calibration

The display guides you thru a calibration procedure with calibration information

z Storage in memory

The meter stores measuring data automatically or manually

z Data transmission

The meter transmits measuring data and calibration records to a serial interface automatically or manually.

z 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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M 545P 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 with the <▲><▼>

keys.

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Operation M 545P

4.3.1 Measuring the pH value

1 Perform the preparatory activities according to section 4.3.

2 Immerse the pH electrode in the test sample.

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

parameter pH is displayed.

AutoRead AR

(drift control)

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

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 <AR>, activate the AutoRead function.

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

3 Start measurement with AutoRead with <OK>.

The AR display indicator flashes until a stable value is measured. This measured value is downloaded to the interface.

4 If necessary, start the next measurement with AutoRead with

<OK>.

5 To terminate the AutoRead function: press the <MODE> or

<AR>

key.

Note

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

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M 545P 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 section 4.3.

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 M 545P

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 in the meter. Thus, you should calibrate at regular intervals.

When do you have to

calibrate?

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

Buffer sets for

calibration

z After connecting another electrode

z When the sensor symbol flashes on the display:

– after the calibration interval has expired

– after a voltage interruption (empty batteries)

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

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 consideration during the calibration.

No. Buffer set * pH values at

1 Buffers according to DIN 19266 and

NIST Retraceable Buffers

1.679

4.006

25 °C

6.865

9.180

12.454

2 Technical buffers 2.000

4.010

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

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25 °C

20°C

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M 545P Operation

No. Buffer set * pH values at

6 DIN 19267 1 1.090

4.650

6.790

9.230

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

25 °C

12 Baker * 4.006

25 °C

6.991

10.008

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 69).

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Operation M 545P

Note

The buffer set is selected in the menu for measurement settings (see section 4.7.2). A list of the stored buffer sets can be downloaded to the interface (Set 1 ... 16) with <CAL measurement settings.

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:

_> while selecting the buffer set in the menu for

Determined values

1-point ASY z Zero point = ASY

2-point ASY

SLO

3-point ASY

SLO

Note

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

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

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

Displayed calibration data

z Slope = Nernst slope

(-59.16 mV/pH at 25 °C)

z Zero point = ASY

z Slope = SLO

z Zero point = ASY

z Slope = SLO

The calibration line is calculated by linear regression.

AutoRead The calibration procedure automatically activates the AutoRead

function. The current measurement with AutoRead 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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M 545P Operation

Displaying the

calibration data

You can display the data of the last calibration (see ). Subsequently, you can transmit the displayed calibration data to the interface, e. g. to a printer or PC, with the <CAL

_> key.

Note

The calibration record is automatically transmitted to the interface after calibrating.

Sample record:

16.09.2005 08:53:54 M 545P 02320025

Calibration pH Cal time: 16.09.2005 08:22:14 Cal interval: 14d

Buffer 1 2.000 Buffer 2 4.010 Buffer 3 7.000 Buffer 4 10.011 b1 -177.0 mV 25.0 °C b2 177.0 mV 25.0 °C b3 0.0 mV 25.0 °C Slope : -58.99 mV/pH Asymmetry : 0.4 mV Sensor : +++

AutoCal

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 sensor symbol and in the calibration record.

Sensor symbol Calibration

record

Zero point [mV]

Slope [mV/pH]

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

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

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

-57 ... -56

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Operation M 545P

Preparatory activities

Sensor symbol Calibration

record

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

Clean the electrode according to the sensor operating manual

CalError CalError

Eliminate the error according to chapter 6 W

HAT TO DO IF...

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

2 Connect a pH electrode to the meter.

Zero point [mV]

< -30 or > 30

Slope [mV/pH]

-56 ... -50

... -62 or ... -50

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.

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

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M 545P Operation

4.4.1 Calibration interval (Int.C)

The calibration interval reminds you to calibrate regularly. When the adjusted calibration interval (Int.C) has expired, the sensor symbol flashes. It is still possible to measure.

Note

To ensure the high measuring accuracy of the measuring system, 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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Operation M 545P

4.4.2 Automatic calibration 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

DIN

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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M 545P Operation

Continuing with two-

point calibration

Buffer

SET

AutoCal

DIN

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 electrode in the second buffer solution.

8 Start the measurement with <OK>.

Buffer

SET

AutoCal

DIN

Note

Here you can cancel the calibration procedure with <MODE>. This corresponds to a two-point calibration. The value of the zero point

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Operation M 545P

(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.

Continuing 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 AR 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.

<▲><▼>.

The unit of zero point and slope can also be changed permanently in the measurement settings (see section 4.7.2).

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M 545P Operation

4.4.3 Conventional calibration (ConCal)

Single-point calibration Use any buffer solution for this rapid method.

The calibration will be the more exact the nearer the pH value of the buffer solution is to that of the test sample.

Two-point calibration Use two buffer solutions for this procedure:

z pH 7.0 ± 0.5

z any other buffer solution

Note

The steps 2 and 9 are not necessary if you use a pH electrode with a temperature sensor.

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

and the ConCal function indicator appear. The sensor symbol displays the evaluation of the last calibration (or no sensor symbol in the delivery state or after the measurement parameters have been reset).

ConCal

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

<▲><▼>.

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

0.5 for two-point calibration).

4 Press the <OK> key.

The measured pH value appears on the display.

5 Using <▲><▼>, set the measured value to the nominal pH

value of the buffer solution (at the current temperature).

6 Press the <OK> key. The value of the zero point (mV) and the

sensor symbol appear on the display.

7 Press the <OK> key. SLO appears on the display.

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Operation M 545P

Note

ConCal

8 To continue the two-point calibration, thoroughly rinse the

electrode with deionized water.

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

with <▲><▼>.

10 Immerse the pH electrode in the second buffer solution.

11 Press the <OK> key. The second pH value appears on the

display.

12 Using <▲><▼>, set the measured value to the nominal pH

value of the buffer solution (at the current temperature).

13 When the measured value is stable, press the <OK> key.

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.

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M 545P Operation

4.5 Storage in memory

The pH meter has an internal data memory. It can store up to 800 datasets.

A complete dataset consists of:

z Date/time

z Memory location

z ID number

z Measured value

z Temperature

z Temperature measuring procedure (manual or automatic)

You can transmit measured values (datasets) to the data memory in two ways:

z Store manually (<STO>)

z Switch on AutoStore (Int.1) (<STO

4.5.1 Manual storage

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

1 Store the measurement dataset with <STO>.

The consecutive number of the next free memory location is shown on the display.

No.

Store

_>).

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2 Confirm with <OK>.

The display switches to the entry of the ID number.

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Operation M 545P

Message StoFull

StoFull This message appears when all of the 800 memory locations are

StoFullStoFull

Ident

3 Using <▲><▼>, enter the required ID number (1 ... 9999).

4 Confirm with <OK>.

The dataset is stored. The meter switches to the measuring mode.

occupied.

When the memory is full, you can:

z press <OK> to store the current measured value.

Store

The oldest measured value (memory location

1) will be overwritten by this

z press <MODE> to switch to the measured value display

without storing

z download the data memory (see section 4.5.3)

z clear the memory (see section 4.5.4).

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M 545P Operation

4.5.2 Automatic storage at intervals

In order to store measured values automatically at certain time intervals, set the memory interval (Int.1).

Setting the save interval The default setting for the storage interval (Int 1) is OFF.

By this, the AutoStore function is switched off. To switch the function on, set an interval (5 s, 10 s, 30 s, 1 min, 5 min, 10 min, 15 min, 30 min, 60 min):

Note

When the AutoStore function is active, the automatic switchoff function is off.

1 Using <STO_>, call up the setting menu for automatic storing

(Int.1) .

Time

Auto

Store

2 Set the required interval with <▲><▼>.

3 Confirm with <OK>.

FrEE, the number of free memory locations is displayed.

Auto

Store

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Operation M 545P

4 Confirm with <OK>.

Ident, the entry of the ID number is displayed.

Ident

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

6 Confirm with <OK>.

The meter switches to the measured value display and starts the measuring and storing procedure. AutoStore flashes on the display.

7 As soon as all of the 800 memory locations are occupied,

AutoStore is terminated (Int.1 = OFF). If there are not enough memory locations available for your measurements:

– Output and backup the data memory (see section 4.5.3)

– clear the memory (see section 4.5.4).

and

Switching off the

automatic storing

function

You can terminate the automatic storing function in the following ways:

z set the storage interval (Int.1) to OFF, or

z switch the meter off and then on again.

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M 545P Operation

4.5.3 Downloading the data memory

You can download stored measurement datasets:

z to the display

z to the interface (section 4.6.1)

Download to the display

1 Open the memory menu with <RCL>.

2 If necessary, scroll with <RCL> until Sto disp (measurement

datasets) is displayed.

3 Press <OK> to display the dataset that was last stored.

The memory location of the dataset is displayed for approx. 2 s, then the respective temperature appears.

RCL

While the memory is displayed you can:

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z press <OK> to display further data of the dataset (ID number,

date, time, memory location, temperature)

z press <▲> to display the next dataset

z press <▼> to display the previous dataset

Note

In order to search for certain data of the dataset, e.g. for the date, proceed as follows:

1 Use <OK> to scroll on until the required data, e. g. the date, is

displayed.

2Use <▲> or <▼> to scroll until the required date is displayed.

After approx. 2 s the display shows the respective temperature value.

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Operation M 545P

4.5.4 Erasing the data memory

You can erase all stored measurement datasets.

1 Open the memory menu with <RCL>.

2 If necessary, scroll with <RCL> until Sto disp or Sto prt is

displayed.

3 Press <RCL_> to display the Clr All function.

4Press <OK> to erase the entire contents of the memory.

or Return to the measured value display with <MODE>. The stored data is retained.

4.5.5 Downloading calibration data

Download to display via

memory menu

You can download calibration data:

z to the display

– via the memory menu

– via the calibration menu

z to the interface (see section 4.6.1)

1 Open the memory menu with <RCL>.

2 If necessary, scroll with <RCL> until CAL diSP is displayed.

3 Press <OK> to display the calibration data.

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

Download to display

(during display test)

Alternatively, you can also display the calibration data during the display test:

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

The display test appears briefly on the display.

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M 545P Operation

2 During the display test, display the calibration data with <CAL>.

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

Day.Month

AutoCal

While the calibration data is being displayed you can:

z press <OK> to display further calibration data

z press <▲><▼> to switch over the unit of the zero point (ASY)

z press <▲><▼> to switch over the unit of the slope (SLO)

z press <CAL

_> to download the calibration record to the

(date, zero point, slope)

(while the zero point is being displayed)

(while the slope is being displayed)

interface

Download to display via

calibration menu

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1 Press <CAL>.

2 Press <CAL

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

_> to display the calibration data.

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Operation M 545P

While the calibration data is being displayed you can:

z press <OK> to display further calibration data

(date, zero point, slope)

z press <▲><▼> to switch over the unit of the zero point (ASY)

(while the zero point is being displayed)

z press <▲><▼> to switch over the unit of the slope (SLO)

(while the slope is being displayed)

z press <CAL

_> to download the calibration record to the

interface

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M 545P Operation

4.6 Transmitting data

The meter has an RS232 interface (serial interface). Via the interface, you can transmit data to a PC or printer and update the meter software.

Note

The relevant interface cable has to be connected if you want to download data to the interface (RS232).

Caution

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

4.6.1 Options for data transmission

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

Data Control Operation / description

Current measured values

Stored measured values

Calibration records manual z Without display indication

manual z With <OK>.

automatic, at intervals

automatic z After each measurement

manual z All datasets

z With <AR

can set the transmission interval (Int.2) (section

4.6.2).

z Simultaneously with every

automatic storage process (Int.1) (see section 4.6.2).

with AutoRead.

(see section 4.6.3)

(see section 4.5.5).

z During display indication

with <CAL (see section 4.5.5).

_>. Then you

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automatic z At the end of a calibration

procedure.

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Operation M 545P

4.6.2 Automatically downloading measurement datasets at intervals

In order to automatically download to the interface measured values at certain time intervals, set the download interval (Int.2).

Setting the download

interval

The default setting for the download interval (Int 2) is OFF. To switch the function on, set an interval (5 s, 10 s, 30 s, 1 min, 5 min, 10 min, 15 min, 30 min, 60 min):

1 Press <AR_> to open the setting of the Int.2 interval.

2 If necessary, set an interval with <▲><▼>.

3 Close the setting with <OK>.

The download to the interface takes place at the specified interval.

4.6.3 Downloading stored measurement datasets

1 Open the memory menu with <RCL>.

2 If necessary, scroll with <RCL> until Sto Prt is displayed.

3 Press <OK> to download the calibration data to the interface.

4.6.4 Downloading calibration data

1 Open the memory menu with <RCL>.

2 If necessary, scroll with <RCL> until CAL Prt is displayed.

3 Press <OK> to download the calibration data to the interface.

4.6.5 RS232 interface

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M 545P Operation

1 Connect the interface to the PC or printer via a suitable cable.

2 Set up the following transmission data on the PC/printer:

– Baud rate: selectable from 1200, 2400, 4800, 9600,

– Handshake: RTS/CTS + Xon/Xoff

– PC only:

– Parity: none

– Data bits: 8

– Stop bits: 1

Socket assignment

(RS232)

RS 232

2 RxD 3 TxD 4 not used 5 SGnd 6 CTS

1 not used

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Operation M 545P

4.7 Settings

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

z System settings (<OK

– Baud rate (Baud)

– Switch-off interval (t.Off)

– Date (Day.Month)

– Date (Year)

– Time (Time)

z Calibration and measurement settings (<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])

z Setting for automatic storage (<STO

– AutoStore interval (Int.1)

_>)

z Setting for data download (<AR

– Data download interval (Int.2)

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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M 545P Operation

4.7.1 System settings

The default setting is printed in bold.

Baud rate (Baud) 1200, 2400, 4800, 9600

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.

Baud rate (Baud)

Switch-off interval (t.Off)

Baud

2 Set the required baud rate with <▲><▼> .

3 Confirm with <OK>.

t.OFF, the setting of the switch-off interval is displayed.

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Time

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Operation M 545P

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

5 Confirm with <OK>.

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

Date and time

Day.Month

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

7 Confirm with <OK>.

The month display flashes.

8 Set the current month with <▲><▼> .

9 Confirm with <OK>.

Ident, the setting of the year is displayed.

10 Set the year with <▲><▼> .

11 Confirm with <OK>.

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

12 Set the current hour with <▲><▼> .

13 Confirm with <OK>.

The minute display flashes.

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

15 Confirm with <OK>.

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

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M 545P Operation

4.7.2 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),

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

1 ... 16

U (electrode voltage)

Buffer set for pH

calibration

(SET)

Unit of the value for the zero point (ASY)

Resolution (pH display) Hi (high), Lo (low)

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

mV, pH

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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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Operation M 545P

Display during

calibration

(bUFF)

Unit of the value for the

slope

(SLO)

mV/pH

AutoCal

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

5 Confirm with <OK>.

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

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.

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M 545P Operation

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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Operation M 545P

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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M 545P Operation

4.7.3 Interval for automatic storing (AutoStore)

After setting the interval for automatic storing the current measurement dataset is stored at the specified interval.

AutoStore interval (Int.1) OFF, 5 s, 10 s, 30 s, 1 min,

5 min, 10 min, 15 min, 30 min, 60 min

1 Press <STO_> to open the setting for the storage interval.

Int.1, the setting of the storage interval is displayed.

AutoStore

interval

Time

Auto

Store

2 Press <▲><▼> to select an interval.

3 Confirm with <OK>.

The setting of the storage interval is completed. The meter switches to the measuring mode.

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Operation M 545P

4.7.4 Interval for automatic data transmission

The interval for automatic data transmission serves to transmit the current measurement dataset to the interface at the specified interval.

Data transmission

interval

Data transmission interval (Int.2)

1 Press <AR_> to open the setting for the transmission interval.

Int.2, the setting of the transmission interval is displayed.

2 Press <▲><▼> to select an interval.

OFF, 5 s, 10 s, 30 s, 1 min,

5 min, 10 min, 15 min, 30 min, 60 min

3 Confirm with <OK>.

The setting of the interval for data transmission to the interface is completed. The meter switches to the measuring mode.

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M 545P Operation

4.8 Reset

4.8.1 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.

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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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Operation M 545P

4.8.2 Resetting meter settings

This function resets to the default condition all meter settings. The relevant values are given in the following sections:

System settings section 4.7.1

Measurement settings section 4.7.2

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.

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.

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M 545P 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 on the display.

5 Set the date and time according to section 4.7.1.

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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.

Page 56

Maintenance, cleaning, disposal M 545P

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 meter against damage during transport.

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M 545P 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

diaphragm

– Air in the diaphragm – Extract air or moisten

– Cable broken – Replace electrode

– Gel electrolyte dried out – Replace electrode

Cause Remedy

– No electrode connected – Connect electrode

– Setting time during calibration

too long

– Use a suitable electrode

– Remove air bubble

diaphragm

– 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.

– Diaphragm contaminated – Clean diaphragm

– Electrode broken – Replace electrode

– Adjust temperature if

necessary

– Recalibrate

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What to do if... M 545P

Cause Remedy

Buffer solutions

– Incorrect buffer solutions – Change calibration

procedure

– Buffer solutions too old – Use only once.

Note the shelf life

– Buffer solutions depleted – Change solutions

No stable measured

Cause Remedy

value

pH electrode:

– Diaphragm contaminated – Clean diaphragm

– Membrane contaminated – Clean membrane

Sensor symbol flashes

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

section 5.1 M

AINTENANCE)

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M 545P What to do if...

Display

Obviously incorrect

measured values

Meter does not react to

keystroke

Cause Remedy

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

connected

Cause Remedy

pH electrode:

– pH electrode unsuitable – Use a suitable electrode

– 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 <AR> key and switch the meter on

You want to know which

software

version is in the

instrument

Message StoFull

Cause Remedy

– E. g., a question by the service

department

– Switch on the meter.

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

Cause Remedy

– All 800 memory locations are

full

– Output data memory and

clear data memory

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What to do if... M 545P

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M 545P Technical data

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

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

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)

Type RS232, bidirectional

Data bits 8

Stop bits 2

Parity None

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.

Guidelines

and norms used

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Handshake RTS/CTS+Xon/Xoff

EMC EC guideline 89/336/EEC

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

Page 62

Technical data M 545P

Meter safety EEC guideline 73/23/EEC

EN 61010-1 ANSI/UL 61010-1; Issued 2004/07/12 Ed: 2, Rev.: 2005/07/22 CAN/CSA-C22.2 No. 61010-1

Climatic class VDI/VDE 3540

IP protection EN 60529

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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M 545P Technical data

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 ... + 105.0 0.1

T [°F] 23.0 ... + 221.0 0.1

Manual

temperature input

Variable Range Increment

[°C] - 5 ... + 125 1

manual

[°F] 23 ... + 257 1

manual

Accuracy (± 1 digit) Variable Accuracy Test sample temperature

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 M 545P

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M 545P 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 meter.

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 helps you to find the topics that you are looking for.

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Lists M 545P

Abbreviations

°C Temperature unit °Celsius

°F Temperature unit, °Fahrenheit

AR AutoRead (drift control)

ASY Zero point (asymmetry)

AutoCal Automatic calibration using a selected buffer set

Cal Calibration

CalError Error message (see W

HAT TO DO IF...)

disp Display

Data memory is displayed

Err1 Overflow

Display range exceeded

Err2 Overflow

Display range exceeded

Err4 Display range exceeded

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

RCL Recall (memory download)

S Slope value

SELV Safety Extra Low Voltage

SEr Serial interface

Download of the data memory to the RS 232

SLO Slope (slope on calibration)

Sto Store (memory)

TP Temperature Probe

Temperature measurement active

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M 545P Lists

Glossary

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

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

Asymmetry see zero point

AutoRange Name of the automatic selection of the measuring range.

AutoRead Function to control the measured value stability.

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.

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.

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).

Measured variable The measured parameter is the physical dimension determined by

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

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

solvent.

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

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

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

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

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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.

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

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

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Lists M 545P

Resolution Smallest difference between two measured values that can be

displayed by a measuring instrument.

Slope The slope of a linear calibration function.

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

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

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.

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

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

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M 545P 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 M 545P

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M 545P Lists

Index

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

AutoCal . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

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

Battery compartment . . . . . . . . . . . . . . . . . 55

Baud rate setting . . . . . . . . . . . . . . . . . . . . 45

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

Calibration evaluation

pH . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Calibration interval . . . . . . . . . . . . . . . . . . . 27

Calibration points

pH . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

ConCal . . . . . . . . . . . . . . . . . . . . . . . . . 24, 31

Connect the power pack . . . . . . . . . . . . . . 15

Dataset . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

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

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

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

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

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

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

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

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

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

Print . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

All meter settings . . . . . . . . . . . . . . . . . 54

Calibration values . . . . . . . . . . . . . . . . 53

Resolution setting . . . . . . . . . . . . . 47, 48, 49

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

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

Setting the date . . . . . . . . . . . . . . . . . . 15, 46

Setting the time . . . . . . . . . . . . . . . . . . 15, 46

Single-point calibration . . . . . . . . . 24, 29, 32

Slope

pH . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

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

Storage interval . . . . . . . . . . . . . . . . . . . . . 35

Firmware update . . . . . . . . . . . . . . . . . . . . 73

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

Interval

Calibration . . . . . . . . . . . . . . . . . . . . . . 27

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

LoBat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Measurement accuracy . . . . . . . . . . . . . . . 27

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

Two-point calibration . . . . . . . . . . . . . . 24, 29

ConCal . . . . . . . . . . . . . . . . . . . . . . . . . 31

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

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M 545P

Appendix: Firmware update

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

firmware of the M 545P to the newest version.

For the update, you can connect the meter to a PC via the RS232 interface.

For the update via the RS232 interface, the following is required:

z a free RS232 interface on your PC

z an RS232 cable (interface cable).

Program installation Install the firmware update program on your PC with the

"Install_Update_Labxxx_MxxxP_Vx_yy_English.exe" installation program.

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

menu. The selected interface is displayed on the left side of the status bar at the lower edge of the window.

You can change the language via the language menu.

Firmware update Proceed as follows:

1 Using the interface cable, connect the M 545P to the serial

interface (COM port) of the PC.

2 Make sure the M 545P 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 instruction 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 meter 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 59).

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M 545P

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Nova Analytics Corp. Woburn, MA USA 01801 866 664 6682

www.nova-ph.com