Metrohm 827pH User Manual

826 pH mobile / 827 pH lab

Manual

8.827.8001EN

Metrohm AG CH-9100 Herisau Switzerland

Phone [phone] Fax [phone] [e-mail] www.metrohm.com

826 pH mobile / 827 pH lab

Program version 5.826.0011 and 5.827.0011

Manual

8.827.8001EN

12.2010 jb/ebe

Teachware Metrohm AG CH-9100 Herisau

[e-mail]

This documentation is protected by copyright. All rights reserved.

Although all the information given in this documentation has been checked with great care, errors cannot be entirely excluded. Should you notice any mistakes please send us your comments using the address given above.

Documentation in additional languages can be found on

http://documents.metrohm.com.

				Contents
Table of contents
1	Introduction..........................................................			1
	1.1	Instrument description.................................................................................		1
	1.2	Parts and controls........................................................................................		2
	1.3	Information about these Instructions for Use .............................................		4
		1.3.1	Notation and pictograms .........................................................................	4
	1.4	Safety information ........................................................................................		5
		1.4.1	Electrical safety ........................................................................................	5
		1.4.2	General handling rules .............................................................................	5
2	Installation...........................................................			7
	2.1	Instrument setup ..........................................................................................		7
		2.1.1	Packaging .................................................................................................	7
		2.1.2	Checks ......................................................................................................	7
		2.1.3	Location ....................................................................................................	7
	2.2	Inserting the batteries at 826 pH mobile .....................................................		7
	2.3	Connecting the electrodes and sensors .....................................................		7
	2.4	Mains connection .........................................................................................		8
	2.5	Switch on......................................................................................................		8
	2.6	Connecting a printer ....................................................................................		9
	2.7	Initial configuration ......................................................................................		9
3	Operation ...........................................................			11
	3.1	Operating concept .....................................................................................		11
	3.2	All key functions at a glance......................................................................		12
	3.3	Operating principles ..................................................................................		14
		3.3.1 Configuration and method parameters .................................................		14
		3.3.2	Editing menu entries ..............................................................................	14
		3.3.3 Entering text and numbers .....................................................................		15
4	Short operating tutorial .....................................			17
	4.1	Requirements .............................................................................................		17
	4.2	pH calibration .............................................................................................		17
	4.3	pH measurement........................................................................................		19
5	Configuration .....................................................			21
	5.1	Report	.........................................................................................................	21
	5.2	Printing out measured values....................................................................		22
	5.3	Storing ...........................................................................measured values		25
	5.4	Auxiliaries...................................................................................................		26
6	Methods ......................................./ Parameters			29
	6.1	pH measurement .....................................................................(pH mode)		29
		6.1.1 ...........................................................................	Measuring parameters	29
		6.1.2 ...........................................................................	Calibration parameters	30
		6.1.3 ......................................................................................................	Limits	32
		6.1.4 .................................................................................	pH calibration data	33
826/827 pH meter, Instructions for Use				I

Contents

	6.2	Temperature measurement (T mode)........................................................		34
	6.3	Potential measurement (U mode)..............................................................		34
7	Various functions ...............................................			35
	7.1	Reports	.......................................................................................................	35
		7.1.1	Arrangement of a report .........................................................................	36
		7.1.2	Report identification ...............................................................................	36
		7.1.3 ...........................................................................	Measuring point report	37
		7.1.4 ...................................................................................	Calibration report	37
		7.1.5 ...............................................................................	Configuration report	37
		7.1.6 ....................................................................................	Parameter report	38
		7.1.7 ...........................................................	Measured values memory report	38
		7.1.8 .......................................................................................	PC/LIMS report	38
		7.1.9 ..................................................................................	System test report	39
	7.2	Measured ..........................................................................values memory		40
		7.2.1 ..........................................................................	Store measured values	40
		7.2.2 ...........................................................................	Print measured values	40
		7.2.3 ..........................................................................	Show measured values	40
	7.3	Setup ..........................................................................................................		42
		7.3.1 ...................................................................................................	Locking	42
8 Troubleshooting .....– Messages – Maintenance				43
	8.1	Troubleshooting.........................................................................................		43
	8.2	Messages ...................................................................................................		45
	8.3	Diagnosis ...................................................................................................		47
	8.4	Maintenance...............................................................................................		49
		8.4.1 .........................................................	Changing the batteries (826 only)	49
		8.4.2 .........................................................	Changing the batteries (827 only)	50
9	Appendix.............................................................			51
	9.1	Technical ............................................................................................data		51
		9.1.1 ..................................................................................	Measuring modes	51
		9.1.2 ....................................................................................	Measuring inputs	51
		9.1.3 ..............................................................	Measuring input specifications	52
		9.1.4 .....................................................................	Measured values memory	52
		9.1.5 ....................................................................................................	Display	52
		9.1.6 ................................................................................................	Interfaces	52
		9.1.7 ..........................................................................................	Power supply	52
		9.1.8 ...........................................................................	Housing specifications	52
		9.1.9 ..............................................................................	Safety specifications	53
		9.1.10 ....................................................	Electromagnetic compatibility (EMC)	53
		9.1.11 .............................................................................	Ambient temperature	53
		9.1.12 .............................................................................	Reference conditions	53
		9.1.13 ............................................................................................	Dimensions	53
	9.2	Menu structures .........................................................................................		55
		9.2.1 ........................................................................	Instrument configuration	55
		9.2.2 ...................................................................	Parameters in the pH mode	56
		9.2.3 ......................................................................	Parameters in the T mode	56
		9.2.4 .....................................................................	Parameters in the U mode	56
	9.3	Stored buffer ...................................................................................series		57

II	826/827 pH meter, Instructions for Use

			Contents
9.4	Scope of delivery .......................................................................................		62
	9.4.1	826 pH mobile ........................................................................................	62
	9.4.2	Optional accessories for 826 pH mobile ...............................................	65
	9.4.3	827 pH lab ..............................................................................................	65
	9.4.4	Optional accessories for 827 pH lab .....................................................	67
9.5	Warranty and conformity ...........................................................................		68
	9.5.1	Warranty..................................................................................................	68
	9.5.2	Declaration of Conformity ......................................................................	69
	9.5.3	Declaration of Conformity ......................................................................	70
	9.5.4	Quality Management Principles .............................................................	71
10 Index...................................................................			73

826/827 pH meter, Instructions for Use

III

Contents

List of illustrations
Fig. 1: pH meter 827 ..................................................................................................................	1
Fig. 2: Front view of the 827 pH lab...........................................................................................	2
Fig. 3: Rear view of the 827 pH lab ...........................................................................................	3
Fig. 4: Connecting sensors........................................................................................................	8
Fig. 5: Changing the batteries for the 826 pH mobile.............................................................	49
Fig. 6: Changing the batteries for the 827 pH lab...................................................................	50

IV	826/827 pH meter, Instructions for Use

1 Introduction

1 Introduction

These instructions provide you with a comprehensive overview of the installation, working principles and operation of the 826 pH mobile and

827 pH lab.

Additional theoretical principles can be found in the Metrohm Monograph 8.015.5013 "Electrodes in Potentiometry".

You can also request our descriptions of applications involving pH measurements in the form of Application Notes and Application Bulletins from your local Metrohm agency or download them from the Internet under www.metrohm.com.

Fig. 1: pH meter 827

1.1Instrument description

Both instrument versions, the portable 826 pH mobile and the laboratory device 827 pH lab, are used for measuring pH, temperature and potential reliably. The functional range is identical. The pH meter 826 pH mobile is operated with batteries whereas the 827 pH lab has got an external power supply.

Up to 200 values can be stored in the memory together with the most important additional data; these can be viewed and printed as a report.

All stored information (measured values, configuration, parameters, etc.) can be transmitted via the infrared interface to a printer or computer for output as a report.

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1

1.2 Parts and controls

Both instruments have the following features:

•Dot-matrix display for both the continuous display of the measured value and for showing the user dialog.

•High-impedance measuring input for pH, redox or ISE sensors, a connection for a separate reference electrode and an input for temperature sensors (NTC or Pt1000).

•Infrared interface for a infrared printer.

1.2Parts and controls

	Fig. 2: Front view of the 827 pH lab
1 LCD display			3 Input and navigation keys
			Menu selection, text and number input

2On/Off key

Key for switching the instrument on and off

2	826/827 pH meter, Instructions for Use

1 Introduction

Fig. 3: Rear view of the 827 pH lab

4Connection for potentiometric electrodes

pH, ISE, redox or silver electrodes with built-in or separate reference electrode; socket type F

5Connection for separate reference electrode

for connection with two 2 mm B-plugs; the adapter 6.2103.180 or 6.2103.190 is necessary with 4 mm banana plugs

6Connection for temperature sensor

Pt1000 or NTC, for connection with two 2 mm B-plugs; the adapters 6.2103.180 and 6.2103.190 are necessary with 4 mm banana plugs; red plug in socket "Temp."!

7Infrared interface

Connection for printer or PC with infrared interface

86 V power connection with 827 pH lab only

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3

1.3 Information about these Instructions for Use

1.3Information about these Instructions for Use

Attention!

Please study these instructions carefully before you start to use the instrument. The instructions contain information and warnings that must be observed by the user in order to guarantee the safe use of the instrument.

1.3.1Notation and pictograms

The following notations and pictograms (symbols) are used in these instructions:

Parameter Menu item, parameter or input value

<< config >>

Menu

<OK> Key

4Operating element

Danger

This symbol indicates a possible risk of death or injury if the given information is not properly observed.

Warning

This symbol indicates a possible risk of damage to the instrument or its components if the given information is not properly observed.

Attention

This symbol indicates important information.

Please read it carefully before you continue.

Information

This symbol indicates additional information and tips.

4	826/827 pH meter, Instructions for Use

1 Introduction

1.4Safety information

Warning!

This instrument should only be used in accordance with the information given in these installation instructions.

1.4.1Electrical safety

Please observe the following guidelines:

•Only qualified Metrohm technicians should carry out service work on electronic components.

•Open the housing only in order to change the batteries. There are no components inside the housing that the user can service or exchange. The changing of the batteries is described in Section 8.4.

Electrical safety when handling the pH meter is guaranteed within the framework of the IEC 61010-1 Standard. The following points must be observed:

Danger!

Please make sure that the external power supply is always kept dry.

Protect it against direct liquid contact.

Warning!

Electronic components are sensitive to electrostatic charges and can be destroyed by a discharge. Always switch off the pH meter before making or breaking electrical connections on the rear panel of the instrument.

1.4.2General handling rules

Handling solutions

Warning!

When working with water or other solutions in the immediate vicinity of the pH meter please avoid excessive liquid splashes on the instrument housing or power supply. Any such splashes must be removed as quickly as possible in order to prevent the liquid from entering the instrument or the power supply.

Do not clean the plexiglass display with organic solvents like e. g. acetone.

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1.4 Safety information

6	826/827 pH meter, Instructions for Use

2 Installation

2 Installation

2.1Instrument setup

2.1.1Packaging

The 826/827 pH meter and its specially packed accessories are supplied in very protective special packaging. Please store this packaging in a safe place; it is the only way in which the safe transport of the instrument can be guaranteed.

2.1.2Checks

Please check that the delivery is complete and undamaged immediately on receipt (compare with delivery note and list of accessories given in

Section 9.4).

2.1.3Location

Place the instrument on a suitable vibration-free laboratory bench, protected from corrosive atmospheres and contact with chemicals.

2.2Inserting the batteries at 826 pH mobile

The 826 pH mobile is delivered without inserted batteries. Inserting the batteries is described in Section 8.4.1.

2.3Connecting the electrodes and sensors

On its rear panel the 826/827 pH meter has connections for a potentiometric electrode 4, a separate reference electrode 5 and a temperature sensor 6.

Connect your electrodes and sensors according to the following diagram to the switched off pH meter:

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2.4 Mains connection

Fig. 4: Connecting sensors

4Connection for potentiometric electrodes

pH, ISE, redox or silver electrodes with built-in or separate reference electrode; plug F

5Connection for separate reference electrode

6Connection for temperature sensor

Pt1000 or NTC, connected via two 2 mm banana plugs, reducing adapters for 4 mm plug B may be necessary (6.2103.180 / 6.2103.190). Please observe: The red plug must be put in the socket "Temp." for shielding purposes!

2.4Mains connection

The 827 pH lab has an external power supply providing 6 V (DC). This is connected to 6 V mains connection 8.

The following power supply units are available:

•6.2161.010 power supply unit EU 230 V / 6 V DC

•6.2161.020 power supply unit US 115 V/ 6 V DC

•6.2161.030 power supply unit UK 230 V / 6 V DC

•6.2161.040 power supply unit AUS 240 V / 6 V DC

Attention!

Please make sure that the power supply is always kept dry. Protect it against direct liquid contact.

2.5Switch on

Switch on the pH meter with the <> key. The instrument will start in the last operating mode to have been used for measuring pH, temperature or potential.

During the switch-on process an instrument checking routine is carried out automatically. If an error message is displayed here ('Err x') then please contact your local Metrohm agency.

8	826/827 pH meter, Instructions for Use

2 Installation

2.6Connecting a printer

A printer with an infrared interface can be connected to the infrared interface for printing out reports.

Activate the infrared interface of the pH meter under configuration/auxil/IR interface: (see Section 5.4) No further transmission parameters need to be set.

Attention!

In order to guarantee a perfect transmission the distance between the pH meter and the printer should be 80 cm at the maximum. The infrared interfaces must face each other directly. Never expose the infrared interface to direct sunlight.

2.7Initial configuration

The pH meter is delivered with standard settings for the configuration. If it should ever be necessary to reset the configuration of the instrument to its original condition then this can be carried out by a re-initialization of the instrument memory (see Section 8.3).

Before you start to make measurements please change the following configuration settings. If you first want to make yourself familiar with the operation of the pH meter then please read Sections 3.1 to 3.3. More detailed explanations of the individual configuration settings are given in Section 5.

Date and time

configuration/auxil/date and /time

Please check that the date and time are correct.

Temperature sensor

configuration/auxil/temp.sens.

Enter the type of temperature sensor that is connected. If no temperature sensor is connected and you always want to enter the measuring temperature manually then you can ignore this setting.

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9

2.7 Initial configuration

10	826/827 pH meter, Instructions for Use

3 Operation

3 Operation

3.1Operating concept

The pH meter provides two types of display:

1.The measured value display.

This is the normal instrument display.

2.The menu display

This is used for editing various settings.

In the measured value display the current measured value is shown together with the method of the temperature measurement (only for mode pH) and the date and time (only for modes U and T) respectively. The measured value display changes when the operating mode of the pH meter is changed with <OK> in the menu << pH/°C/mV >>. You can easily see which mode is set from the measuring unit or the prefix "pH" shown in the display.

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11

3.2 All key functions at a glance

3.2All key functions at a glance

The functions of all the keys are described below both for the measured value display and the menu display:

Key	Measured value display		Menu display
	On/Off		On/Off
	•	The < > key switches the instru-	•	The < > key switches the instru-
		ment on and off.		ment off at any time.
	•	After switching-on the pH meter is in
		the initial state of the last mode to
		have been used.
	Starting calibration
	•	The <CAL> key starts the pH cali-
		bration (in mode pH only).
	Acknowledging messages		Canceling working step
	•	Displayed messages are normally	•	In menus <QUIT> causes a jump
		acknowledged with <QUIT> (Ex-		to the next higher level without ac-
		ceptions: see Section 8.2).		cepting the alterations.
	•	If the cause of the message has not
		been remedied, then it will appear
		again at the next check.
	Menu selection		Selecting predefined entries
	•	The menu is being changed with the	•	For menu parameters which offer a
		arrow keys <> and <>.		fixed choice of settings (recogniza-
				ble by the final colon) the selection
				list can be viewed with the arrow
				keys. The arrow determines the se-
				lection direction.
			Cursor control for text input
			•	The cursor is moved to that position
				which needs to be altered.

12	826/827 pH meter, Instructions for Use

					3 Operation
	Key	Measured value display		Menu display
		Altering display contrast		Controlling the menu bar
		•	The contrast of the LCD display can	•	In each menu display the <> und
			be altered with the arrow keys <>		<> keys can be used to move the
			and <> during the measured val-		selection bar up and down by one
			ue display.		line.
		• This setting is retained after the in-		Cursor control for text input
			strument has been switched off and	•	The character to be entered is se-
			on. The default value is only reset af-		lected with the arrow keys and en-
			ter the memory has been initialized.		tered with <OK>.
				Leafing through the measured value
				memory
				•	Leafing through between the entries
					in the measured value memory dis-
					play: starting from the last measured
					value having been stored you can
					access older entries with <> and
					vice versa.
		Calibration		Confirming entry
		•	The calibration sequence is contin-	•	The <OK> key is used to complete
			ued with <OK>.		each entry with the selection bar
		•	The calibration data are accepted		moving on to the next parameter. If
					an entry is exited without this confir-
			with <OK> in case they are out of
					mation then the entered value will be
			the defined limits.
					rejected.

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3.3 Operating principles

3.3Operating principles

3.3.1Configuration and method parameters

Instrument configuration and parameters for the pH mode (no adjustable parameters are required for the measuring modes U (mV) and T (°C)) are each contained in menus with a tree structure. These menu structures are shown in the appendix in Section 9.2.

The instrument configuration of the pH meter is described in the menu

<<config >>. This contains the basic settings that apply for all measuring modes. The parameters for the pH mode are stored in the menu

<<param >>.

The change from the measured value display to the menu display is made by selecting the corresponding menu and confirming with the <OK> key. The title of the submenu appears first, and is shown with an '>' (e. g. >report). You can now move the selection bar up and down with the <> and <> arrow keys. Each underlying level in the menu structure is opened with <OK> and exited with <QUIT>. Alterations to individual entries must be confirmed with <OK>. If such alterations are exited with <QUIT> then they remain ineffective.

If an entry is confirmed with <OK> then the selection bar will move to the next entry. At the end of a submenu it will finally change to the next point of the superior menu selection.

In this way you can run through the complete menu structure for the configuration and parameters by repeatedly pressing the <OK> key. This can be helpful when carrying out checks.

Not all parts of the menu structure described below are visible in the display at all times. Only the specific possible settings of the option which is currently activated are shown. For example, the various settings for printing under configuration/print/print crit. are not visible when printing has been deactivated completely (off). If one of the other printing criteria is selected then the particular settings it requires will appear in the display.

3.3.2Editing menu entries

A basic differentiation is made between two types of menu entry.

Entries with a fixed selection are indicated by a colon:

print crit.: immed., time, drift, change, off

The selection is then made with the arrow keys and confirmed with

<OK>.

Entries which can be edited are altered by entering a new value and confirming it with <OK>.

14	826/827 pH meter, Instructions for Use

3 Operation

3.3.3Entering text and numbers

The editing of text and number inputs is activated with the <> or <> key. The first digit of the entry field will be displayed inverted for text entries whereas it is the last digit for number entries. The cursor can be moved to the position to be changed with the <> or <> key.

The desired character can be selected from a cylinder with the <> or <> keys. The cursor movement can be accelerated by keeping the arrow keys pressed down.

The following characters can be selected:

•For ASCII entry fields:

a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, ., –, empty

•For number entry fields:

0, 1, 2, 3, 4, 5, 6, 7, 8, 9, ., –, empty

The entry is checked for validity and accepted if it is valid. Otherwise the entered value is blinking and it can be corrected. If a space has been entered between two numbers of a number entry, the display is blinking as well. The value can be corrected then or the original value is entered by pressing <QUIT>. The editing can be exited with <QUIT> without storing the setting.

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15

3.3 Operating principles

16	826/827 pH meter, Instructions for Use

4 Short operating tutorial

4 Short operating tutorial

In this section the necessary steps for carrying out a simple pH and ion measurement with calibration are described. The instructions are limited to those steps that are absolutely necessary and will enable you to carry out your first measurements with the pH meter directly. The operating principles are described in Section 3.3.

4.1Requirements

The following instruments, accessories and solutions are required for carrying out the pH calibration and measurement described below:

•826 pH mobile (2.826.0XX0) or 827 pH lab (2.827.011X,

2.827.021X)

•pH electrode

•Calibration buffers

Metrohm buffer solutions pH 4.00 and pH 7.00

The calibration parameters for the pH mode are set for a calibration using two Metrohm buffers as default (see Section 6.1.2). If you want to use other buffers then the corresponding buffer type must be entered.

4.2pH calibration

1Start calibration with first buffer

•Start calibration with <CAL>

•Immerse pH electrode in buffer solution pH 7 and confirm with

<OK>

•If a temperature sensor is connected, the calibration temperature is being determined

•If no temperature sensor is connected:

enter the temperature with the arrow keys and confirm with

<OK>

•The first buffer is being measured

•The following message is displayed after successful measurement:

change buffer <OK>

2Continue calibration with second buffer

•Remove pH electrode from first buffer and rinse with water

•Immerse pH electrode in second buffer solution pH 4 and continue calibration sequence with <OK>

•The second buffer is being measured

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