Metrohm 760 User Manual

760 Sample Changer760 Sample Changer

Instructions for Use

8.760.1013

CH-9101 Herisau/Switzerland
Phone [phone]
Fax [phone]
E-Mail [e-mail]
Internet www.metrohm.ch

760 Sample Changer

Instructions for Use

8.760.1013

2000.07 up/dm

Table of Contents

Page

1 OVERVIEW .................................................................1

1.1 Side View .................................................................... 1

1.2 Rear View ....................................................................2

1.3 Sensors ......................................................................3

2 INSTALLATION ............................................................4

2.1 Setting up the Instrument ...........................................4

2.2 Safety Considerations ................................................6

2.3 Arranging the Accessories .........................................7

2.3.1 Connecting the Keyboard ...................................7

2.3.2 Magnetic Stirrer ................................................. 7

2.3.3 Racks ............................................................... 7

2.3.4 Mounting and Setting up the Titration Heads ........ 8

2.3.5 Use of the sample beaker for Karl Fischer

Titration ........................................................... 10

2.4 Remote Connections ............................................... 11

2.4.1 Typical Combinations of Instruments ................ 12

2.5 Racks ........................................................................ 14

3 INTRODUCTION .........................................................15

3.1 Important Features ................................................... 15

3.2 Key Functions ........................................................... 16

3.3 Memory Initialization ................................................ 17

3.4 Configuration Procedure .......................................... 17

3.4 The Methods ............................................................. 20

4 APPENDIX ................................................................23

4.1 Error Messages ......................................................... 23

4.2 Method Listings ........................................................ 25

4.3 Technical Specifications ........................................... 29

4.4 Servicing and Maintenance ....................................... 30

4.4.1 Servicing ......................................................... 30

4.4.2 Maintenance / Attendance ................................ 30

4.5 Warranty and Conformity ......................................... 31

4.5.1 Warranty ......................................................... 31

4.5.2 Certificate of Conformity .................................. 32

4.6 Accessories .............................................................. 34

5 INDEX......................................................................37

1.1 Side View

Plug cover

Rack

Line sleeve

Line frame

Tower

Connectors

Stirrer rail

1 Overview

1.1 Side View

Splash protection

Lift

760 Sample Changer, Overview

Safety note:
Never operate the 760 Sample Changer without splash protection
and plug cover being mounted. The plug cover prevents any con­tamination of the connectors, caused by spilled solvents or chemi­cals.

1

1.2 Rear View

Remote socket

Line sleeve

Plug cover

Keyboard connector

Line frame

The Connectors (side view):

Stirrer sockets

The remote socket serves the connection of Metrohm- or other
measuring instruments that communicate via a parallel cable
(see p. 11).

1.2 Rear View

Type 1.760.0010 Nr. 0010/01104

Keyboard

Made by Metrohm Herisau Switzerland

Mounting srew
for splash protection

760 Sample Changer, Overview

2

1.3 Sensors

Keyboard connector

Splash protection

Beaker indicator

Rack

Magnetic indicator

Manufacturing number

Magnet holder

Keyboard Connector (rear):

Type 1.760.0010 Nr. 0010/01104

Keyboard

1.3 Sensors

Beaker test

Made by Metrohm Herisau Switzerland

Each tower of the 760 Sample
Changer is equipped with a
beaker indicator to detect the
presence of a beaker in front
of the tower. This infrared
sensor detects many different
materials, if any object is
placed in correct position. This
beaker test is carried out after
each MOVE operation.

Front view

Magnetic rack code indicator

The magnetic sensor for the
detection of the individual rack
codes is mounted below the
sample changer's turntable.
The magnetic binary code of
the racks can only be read, if
the rack is in initial position
and therefore the magnet
holder is in accurate position
right above the rack code in­dicator. For this reason the
760 Sample Changer should
be initialized by <RESET> or
turned off and on right after
every rack change.

760 Sample Changer, Overview

3

2.1 Setting up the Instrument

2 Installation

2.1 Setting up the Instrument

Packaging

The 760 Sample Changer is supplied with the accessories in sepa­rate special packages designed to ensure maximum protection.
These contain shock-absorbing foam linings. As only these special
packages guarantee damage-free transport of the instrument, it is
essential you store them in a safe place.

Control
Immediately following delivery, check that the consignment is
complete and undamaged (compare with delivery note and acces­sories list in the Instructions for Use, page 34). In case of damage
see "Warranty", page 31.

Setting up
The 760 Sample Changer is a rugged instrument and may be used
in rough environments such as laboratories and manufacturing
plants. It must not be exposed to a corrosive atmosphere. If the
sample changer is operated in a rough environment, regular main­tenance is strongly recommended.

Power Supply

Follow these instructions to connect the 760 Sample Changer to
the power supply. Ensure that the instrument is never operated
with incorrect voltage ratings and/or with fuses of an incorrect rat­ing, otherwise there is a fire hazard!

Setting the instrument supply voltage

Before switching on the 760 Sample Changer for the first time,
check that the line voltage set on the instrument (see next page)
matches the local power supply voltage. If this is not the case,
change the voltage setting as follows:

760 Sample Changer, Installation

4

0 Power Supply

100 – 120 V

220 – 240 V

Fuse holder

• Disconnect line cable
Unplug the 760 Sample Changer.

• Remove fuse holder

Using a screw driver, loosen the fuse holder and pull it out.

• Checking and replacing fuse
Carefully remove the built-in fuse and check its specifications.
(The position of the fuse in the fuse holder is marked by the
white arrow printed next to the supply voltage):

100……120 V 0.5 A (slow) ord. no. U.600.0014
220……240 V 0.25 A (slow) ord. no. U.600.0011

• Replace fuse
Replace fuse if necessary and reinsert it in the fuse holder.

• Insert the fuse holder
Insert the fuse holder according to the appropriate supply volt­age. The white arrow besides the desired voltage has to point
towards the white block mark printed on the fuse holder's panel
(see below).

100

-

-

120 V

240 V

-

-

220

220

-

-

240 V

120 V

-

-

100

Power switch

Power plug

760 Sample Changer, Installation

5

2.2 Safety Considerations

2.2 Safety Considerations

Safety note:
Never operate the 760 Sample Changer without splash protection
and plug cover being mounted. The plug cover prevents any con­tamination of the connectors, caused by spilled solvents or chemi­cals.

If failure or malfunctioning occurs during operation of the 760 Sam­ple Changer, the Metrohm Service Department should be
consulted.

If opening the instrument is unavoidable, the following safety pre­cautions are to be strictly adhered to:

Before opening the instrument disconnect it from all electri­cal sources. Make sure that the power plug has been pulled
out.

Electronic components are sensitive to static electricity and can be
destroyed by discharge. Before touching any components inside
the instrument, both the person and his tools should be grounded
by grasping a grounded object (for example: a metallic part of the
casing of the instrument or a radiator) in order to eliminate any
static electricity.

Only in exceptional cases should the instrument be opened while it
is switched on. Because parts that conduct current are exposed in
this case, this should only be undertaken by an expert who is ac­quainted with the associated dangers.

When peripheral instruments are connected to the 760 Sample
Changer, the sample changer and the instruments to be connected
have to be switched off, otherwise all instruments could suffer
damage.

If it becomes apparent that the instrument can no longer be oper­ated safely, it must be put out of operation.

760 Sample Changer, Installation

6

2.3 Arranging the Accessories

Rack

Magnet holder

Magnetic sensor

Rack

2.3 Arranging the Accessories

2.3.1 Connecting the Keyboard

Type 1.760.0010 Nr. 0010/01104

Keyboard

Made by Metrohm Herisau Switzerland

The keyboard is to be con­nected to the keyboard
socket on the rear side of the
sample changer.

To disconnect press the plug
together slightly on both
sides.

2.3.2 Magnetic Stirrer

Stirrer rail

2.3.3 Racks

Magnetic stirrers 2.741.0010
may be placed in any position
on the stirrer rail beneath the
rack.

After placing the rack on the
turntable, the sample
changer must be initialized by
pressing the <RESET> key
or turning the sampler
changer off and on. This
enables the safe reading of
the magnetic rack code and
can only be done if rack
position 1 is directed to
tower 1. Before a rack is
used for the first time, the lift
positions have to be set (s.
Chapter. 3.4).

760 Sample Changer, Installation

7

2.3 Arranging the Accessories

2.3.4 Mounting and Setting up the Titration Heads

Macro Titration head

6.1458.010

Micro Titration head

Mounting screws

M8 Aspiration tip

(also for Macro Titration head)

6.1543.170

Electrode

Rotating nozzle

6.2740.000

Burette tip

6.1543.200

Rod stirrer

2.722.0020

M6 Spray nozzles

(also for Macro-Titration head)

6.2740.020

SGJ14 sleeve

6.1236.020

M8 Thread stopper

4.658.0180

SGJ9 Guide sleeve

6.2709.070

Stirrer propeller

6.1909.020

6.1458.020

Use only the designated
Micro electrodes with the
Micro Titration head, see

accessory list, page 34.

Note on Macro Titration head
The arrow sign marks the slightly sloped SGJ14 boring, which enables to center a rod
stirrer or an electrode in a narrow titration vessel.

760 Sample Changer, Installation

8

2.3 Arranging the Accessories

Mounting and Setting up the Titration head KFT

Titration head KFT

6.1458.030

Mounting screws

Double-Pt-Electrode

Burette tips

6.0340.000

6.1543.200

M10 Thread connectors

6.1543.200

O-Rings

E.301.0022

O-Ring (bottom side)

E.301.0080

Note:
For an optimal sealing of the titration vessel, the M10 thread con-

nectors should be mounted together with the O-rings.
All tubing and cables connected to the titration head should be

guided through the line frame to ensure full motility for the lift.
Note that there is enough line reserve for a complete down
movement of the lift.

760 Sample Changer, Installation

9

2.3 Arranging the Accessories

Al foil

2.3.5 Use of the Sample Beaker for Karl Fischer Titration

For Karl Fischer titration the

Foil holder

6.2037.040

Sample beaker

During the method run the lift is moved down to the working
position. Thereby, the electrode and burette tips break through the
Al foil. Using Al foil 6.2820.000 this means no risk for the
instruments. This step can be facilitated by binding together all three
devices approx. 2 cm above the bottom of electrode and
burette tips using an O-ring E.301.0022. Thus, the impulse is
focused on a small area of the Al foil.

weighted sample is dosed into
the sample beaker together with
a stirring bar 6.1903.010.
The beaker is sealed with a
centered aluminium foil

6.2820.000 using the foil holder.

760 Sample Changer, Installation

10

2.4 Remote Connections

2.4 Remote Connections

Remote

Dosimat

Titrino
Family

765
776

702
716

718
719
720
736
751
758
784
785

Valves

760 Sample Changer

Relay Box 731

Pumps,
e.g. 772

Connecting peripheral instruments to the 760 Sample Changer re­quires Metrohm cables. Otherwise a safe data transmission may
not be guaranteed.

The required cables are listed in the following table. Details about
the control commands are given in the Instructions for Use of the
corresponding instrument.

Connection of: Cable ordering no.
Titrino or 692/712/713 pH-Meter/Ionmeter/Conductometer 6.2141.020

Titrino and 765 or 776 Dosimat 6.2141.040
691 pH-Meter 6.2141.060
692 Ionmeter and 765 Dosimat 6.2141.070
678/682/686/672 Titroprocessors 3.980.3640
678/682/686/672 Titroprocessors and 671 Switch Box 3.980.3650

All instruments have to be switched off, before they are connected.
Otherwise the instruments could suffer from damage.

760 Sample Changer, Installation

11

2.4 Remote Connections

Cable 6.2141.020

Inputs

Outputs

14 lines (Output 0–13) are available for the emission of signals.
For receiving signals 8 lines are provided (Input 0–7). The
assignment of these lines is fixed for the 760 Sample Changer.

Pin assignment of the Remote socket:

0 Volt

+5 Volt
Output 5
Output 3
Output 1

Output 12
Output 13

Input 0

Input 2

Input 4

Input 6

0 Volt

Output 6
Output 7
Output 4
Output 2
Output 0
Output 8
Output 9
Output 10
Input 1
Input 3
Input 5
Input 7
Output 11

The +5 V supply line may by charged with 20 mA maximally.

2.4.1 Typical Combinations of Instruments

760 Sample Changer — Titrino

with standard cable

+5V

active = low
inactive = high

active = low
inactive = high

760 Sample Changer, Installation

12

B

A

Titrino

C

D

Remote control commands:
Output 0: *************1 starts Titrino

Input 3: ****1*** awaits end of titration (EOD pulse)

2.4 Remote Connections

760 Sample Changer — Titrino — Dosimat 765/776

B

A

Titrino

A

765

C

D

Cable 6.2141.040

D

B

C

Remote control commands:
Output 0: *************1 starts Titrino

Output 6: *******1****** starts Dosimat
Input 3: ****1*** awaits end of titration (EOD pulse)

Pump Control via Remote Lines

Using methods 3 and 4, external pumps can be controlled via the
remote interface. To start a pump, an inverted pulse of duration of
at least 200 ms is sent to pin 7 (Output 9) of the remote socket.
To continue with the method the pump must indicate its readiness
by setting the input line 1 (pin 9) to low level for at least 20 ms.
Ask your pump distributor or Metrohm for customized connecting
cables.

Pin 9 Input

t

p

t

>20 ms

p

+5V

active = low
inactive = high

Pin 7 Output

V

t

p

CEO

t

>200 ms

p

= 40 V

active = low
inactive = high

IC = 20 mA

760 Sample Changer, Installation

13

2.5 Racks

2.5 Racks

A sample rack is a sort of turntable for the positioning of beakers
which are to be placed on the Sample Changer. Because for titra­tion, various sizes of beakers are common or required, many kinds
of racks can be used and are easily interchangeable. The rack of­fers space for various numbers of samples depending on the
diameter of the beakers. Metrohm delivers the following predefined
types of standard racks:

Type Number of

beakers

M12-0 12 250 mL Metrohm glass beaker 000001 6.2041.310
M12-0 12 150 mL glass beaker or

M14-0 14 200 mL disposable beaker (Euro) 000011 6.2041.370
M14-0 14 8 oz disposable beaker (US) 000101 6.2041.380
M16-0 16 150 mL glass beaker 000010 6.2041.320
M16-0 16 120 mL disposable beaker (US) 100001 6.2041.390
M24-0 24 75 mL Metrohm glass beaker 001000 6.2041.340

Type of beaker Predefined

Code

100000 6.2041.360

200 mL disposable beaker (Euro)

Every single rack can be identified by a unique magnetic code.
Rod magnets which are attached to the bottom of the rack can be
combined to form a 6-place binary code. The sample changer can
then automatically recognize the mounted rack. This is possible
when the rack is positioned with the first rack position under lift 1.
After changing a rack, the sample changer should first be initial­ized by pressing the <RESET> key or turning the instrument off
and on. This way the save recognition of a rack and therefore the
correct beaker positioning is made possible.

Order Number

760 Sample Changer, Installation

14

3.1 Important Features

3 Introduction

3.1 Important Features

Overview

The 760 Sample Changer provides most of the important features
of the 730 Sample Changer:

• Interchangeable Metrohm standard sample racks

• Working, rinsing and shift heights can be specifically defined

• Automatic rack recognition by means of standard rack codes

• Optical beaker test

• Two stirrers (magnetic or rod stirrer) can be connected

• Operation with most Metrohm instruments via Remote I/O lines

LimitationsLimitations

• 4 fixed procedures that cannot be edited

• No RS 232 interface, no built-in pumps

• Simple keyboard with 3 keys and 2 LEDs (green and red)

• The turning speed of the rack cannot be varied

• No special rack types can be defined

Basic Settings

• Working, rinsing and shift heights can be defined for each rack
type

• Stirrer speed can be defined for both stirrers together

• One of 4 methods can be selected as the standard method

760 Sample Changer, Introduction

15

3.2 Key Functions

3.2 Key Functions

The 760 Sample Changer operates in two different modes where
the keys provide different functions:

The Basic Mode starts when the instrument is turned on. The
ready-to-operate status is indicated by the green LED.

Basic Mode:
(after Power on, green LED on)

START

RESET

STOP

Starts processing of a sample series.

Stops processing of a sample series or initializes the
760 Sample Changer.

Interrupts processing of a sample series, green LED

HOLD

blinks.

START

Continues processing of a sample series.

The Configuration Procedure starts when the instrument is
switched on with pressing <HOLD> simultaneously. The green
LED blinks once. Now, the method can be selected and working,
rinsing and shift heights as well as the stirrer speed can be de­fined.

Configuration Procedure:
(after Power on with <HOLD> pressed, green LED blinks once)

Accepts the setting of a value and moves on to the

START

next value.

Learning mode, manual execution of a changer func-

HOLD

tion for setting a configuration.

RESET

STOP

760 Sample Changer, Introduction

16

Cancels a configuration setting and initializes the 760
when <STOP> is pressed twice. Switches back to
basic condition.

3.3 Memory Initialization

3.3 Memory Initialization

The system memory can be initialized to set default parameters
when required (e.g. in the case of mal-functions). For this purpose
press all keys while the sample changer is switched on.

It is recommended to execute an initialization before the first instal­lation of the sample changer.

RESET

START HOLD STOP

3.4 Configuration Procedure

The Configuration Procedure starts when the instrument is
switched on with pressing <HOLD> simultaneously. The method is
being selected and working, rinsing and shift heights are defined
and assigned to the selected rack type. Additionally, the stirrer
speed can be defined.

If the 760 Sample Changer is used for the first time, the lift posi­tions have to be adapted to the selected rack type. This applies
also if a new rack type is inserted for the first time.

Empty beakers with a stirrer bar if necessary should be used for
the definition of the lift positions. Additionally, the foil holder has to
be used without Al foil if the Sample Changer is being set up for
Karl Fischer titration.

The working position should be defined in such a way that the
connected electrode tip stands in the center of the sample. The
shift position should allow a free rotation of the sample rack. In the
rinsing position, the aspiration tip should touch the bottom of the
sample beaker. If no rinsing step is necessary (method 1 and 2),
no rinsing position has to be defined.

In order to proceed to the next point in the configuration procedure,
<START> must be pressed. This accepts the current setting.
<STOP> is pressed in order to cancel a setting. The configuration
procedure is terminated by pressing <STOP> again.

The LEDs show either the status of the sample changer or the cur­rent step in the configuration procedure.

and "Power on"

760 Sample Changer, Introduction

17

3.4 Configuration Procedure

The Configuration Procedure

Key LEDs Explanation

HOLD

+

"Power ON"

HOLD

START

HOLD

START

green 1∗

red 1-4∗

green 1∗

green 2∗

red blinks

green 2∗

green 3∗

In order to start the configuration procedure the <HOLD> key
must be pressed while the sample changer is switched on.

The green LED lights up once to show that the configuration
procedure is active. The method can now be selected.

When the <HOLD> key is pressed the red LED blinks once
for the first method. Each time <HOLD> is pressed again the
next method is selected up to method 4, then method 1
again.

<START> accepts the setting. The green LED blinks twice.
The working position of the lift can now be set.

When the <HOLD> key is pressed the lift can be moved
manually. Each further time the <HOLD> key is pressed the
direction in which the lift moves is altered. In this way the
working position can be set accurately.

<START> accepts the setting. The working position is stored
specifically for the type of rack inserted. The green LED
blinks three times. The rinsing position of the lift can now

be set.

HOLD

START

HOLD

START

red blinks

When the <HOLD> key is pressed the lift can be moved ma­nually. Each further time the <HOLD> key is pressed the
direction in which the lift moves is altered.

green 3∗

green 4∗

red blinks

<START> accepts the settings. The rinsing position is stored
specifically for the type of rack inserted. The green LED
blinks four times. The shift position of the lift can now be
set.

When the <HOLD> key is pressed the lift can be moved ma­nually. Each further time the <HOLD> key is pressed the

direction in which the lift moves is altered.

green 4∗

<START> accepts the setting. The shift position is stored
specifically for the type of rack inserted. The green LED
blinks five times. The stirrer speed can now be set.

green 5∗

760 Sample Changer, Introduction

18

3.4 Configuration Procedure

HOLD

START

RESET

STOP

red blinks

The <HOLD> key switches on the stirrer(s). If the <HOLD>
key is kept pressed down the speed increases continuously.
If the <HOLD> key is pressed again the stirrer speed is re­duced in a similar manner. In this way the stirrer speed can

green 5∗

be set accurately.
<START> accepts the setting. The configuration procedure

is now complete. It can be restarted by pressing <HOLD> in
order to select the method.

blinks

lights up

The configuration procedure is terminated with <STOP>.
When the green LED is illuminated the sample changer is in
the basic condition and is ready to process a series of sam­ples.

The individual steps of the configuration procedure:

1∗ Method selection
2∗ Setting the working position

3∗ Setting the rinsing position

4∗ Setting the shift position
5∗ Setting the stirrer speed

760 Sample Changer, Introduction

19

3.5 The Methods

3.5 The Methods

All methods enable the dosing of auxiliary solutions before the ti­tration if a 765 or a 776 Dosimat is used. The dosing volume is to
be defined in the Dosimat. The Sample Changer will start the dis­tribution via a remote line.

The following titration instruments can be used with the 760 Sam­ple Changer: all of the Titrino models (701, 702, 716, 718, 719,
720, 736, 751, 758, 784, and 785) and the Titroprocessors. Simple
measuring series may be performed as well instead of titrations.
The supported Metrohm meters are: 691 and 713 pH-Meter, 692
pH/Ion Meter, 712 Conductometer.

In each method all rack positions will be processed. After the
treatment of the last sample the special beaker (highest rack posi­tion) is moved to the tower and the lift will be lowered to work posi­tion immersing the electrode for rinsing or conditioning.

Method 1 (for exact sequence, see Appendix, p. 25)
Plain working procedure without rinsing
Procedure:

1. move the sample beaker to the tower

2. run lift to work position

3. switch on stirrer

4. start dosing device

5. wait 10 seconds

6. start titrator

7. await end of determination

8. switch off stirrer

9. run lift to shift position

760 Sample Changer, Introduction

20

3.5 The Methods

Method 2 (for exact sequence, see Appendix, p. 26)

Working procedure with sensor conditioning by dipping. The spe­cial beaker (highest rack position) must be filled before with sol­vent or water.

Procedure:

1. move the sample beaker to the tower

2. run lift to work position

3. switch on stirrer

4. start dosing device

5. wait 10 seconds

6. start titrator

7. await end of determination

8. switch off stirrer

9. run lift to shift position

10. get special beaker

11. run lift to work position

12. switch on the stirrer for 5 seconds

13. run lift to shift position

Method 3 (for exact sequence, see Appendix, p. 27)

Working procedure with sensor rinsing in a special beaker using
an external pump.

Procedure:

1. move the sample beaker to the tower

2. run lift to work position

3. switch on stirrer

4. start dosing device

5. wait 10 seconds

6. start titrator

7. await end of determination

8. switch off stirrer

9. run lift to shift position

10. get special beaker

11. run lift to work position

12. switch on the external pump

13. await readiness of the pump

14. run lift to shift position

760 Sample Changer, Introduction

21

3.5 The Methods

Method 4 (for exact sequence, see Appendix, p. 28)

Working procedure with sensor rinsing in the sample beaker using
an external pump.

Procedure:

1. move the sample beaker to the tower

2. run lift to work position

3. switch on stirrer

4. start dosing device

5. wait 10 seconds

6. start titrator

7. await end of determination

8. switch off stirrer

9. run lift to rinse position

10. switch on the external pump

11. await readiness of the pump

12. run lift to shift position

760 Sample Changer, Introduction

22

4.1 Error Messages

4 Appendix

4.1 Error Messages

An error occurring during a sample series is displayed by a blink­ing red LED. The number of flashes indicates the error number.
This must be acknowledged with any key. If an error occurs during
processing of a sample series, the changer will then be switched
into the 'HOLD' state.

After the cause of the error has been rectified, the sample series
can be continued with the next command in the active sequence
by pressing the <START> key. If the error cannot be eliminated,
the method running can also be halted with <STOP>.

The list of possible error messages and their causes:

1* RAM defect Call Metrohm-Service.
3* battery low The battery for the permanent storage of user meth-

ods must be replaced.

4* manual stop The Sample Changer has been stopped manually.

No acknowledgement needed.

6* changer low power The power supply cannot deliver enough power for

the simultaneous operation of all components cur­rently in use (stirrer, pumps, lifts).

7* rack data missing No sample rack is in position or no rack data can be

found for the sample rack that is in place.

8* invalid rack code The rack code read by the changer could not be

found in the internal position tables.

760 Sample Changer, Appendix

23

4.1 Error Messages

9* missing beaker After a MOVE command no beaker could be found at

the selected position.

10* raise lift first Turning of a rack could not be carried out because a

lift was below the defined shift position.

12* changer overload Load or resistance too large to carry out the chosen

action.

14* changer not ready The changer cannot execute the command chosen

because it is busy carrying out another action.

760 Sample Changer, Appendix

24

4.2 Method Listings

4.2 Method Listings

All four methods of the 760 Sample Changer are briefly described in chapter 3.5 on
pages 20 to 22. The present chapter contains the exact program listings of these meth­ods together with more detailed explanations.

Method 1

760 Sample Changer 760.0012
parameters
method 760_1
number of samples: rack
>start sequence
1 CTL:Rm: INIT
2 SAMPLE: - 1
3 SAMPLE: + 1
>sample sequence
1 MOVE 1 : sample
2 LIFT: 1 : work mm
3 STIR: * : ON s
4 CTL:Rm: START dos*
5 WAIT 10 s
6 CTL:Rm: START device1
7 SCN:Rm : End1
8 STIR: * : OFF s
9 LIFT: 1 : shift mm
10 WAIT 3 s
>final sequence
1 MOVE 1 : spec.1
2 LIFT: 1 : work mm
>changer settings
rack number 0
lift rate 25 mm/s
shift rate 20
shift direction: auto.
beaker test mode: single
on beaker error: MOVE
>stirring rates
stirrer 1 3
stirrer 2 3
>dosing unit def.
>manual stop
CTL Rmt: STOP device1
CTL RS232:

------------

¬ report header with program version

¬ method name
¬ number of samples (here full rack)

¬ initialize remote line
¬ initialize

sample position

¬ move next sample beaker to tower
¬ run lift with titration head to working position
¬ switch on stirrer
¬ start dosing device
¬ wait for 10 seconds
¬ start titrator
¬ wait for end of titration [EOD]
¬ switch off stirrer
¬ run lift with titration head to shift position
¬ wait for 3 seconds

¬ move special beaker to tower for conditioning
¬ run lift to work position to immerse sensor

------ settings of sampler functions --------------------

¬ on missing sample beaker, the next one is
selected automatically

------ stirring rates ----------------------------------------­¬ cannot be selected independently

------ settings for dosing devices ------------------------

------ action after manual stop ------------------------­¬ stop device 1

760 Sample Changer, Appendix

25

4.2 Method Listings

Method 2

760 Sample Changer 760.0012
parameters
method 760_2
number of samples: rack
>start sequence
1 CTL:Rm: INIT
2 SAMPLE: - 1
3 SAMPLE: + 1
>sample sequence
1 SHIFTRATE: + 20
2 MOVE 1 : sample
3 LIFT: 1 : work mm
4 STIR: * : ON s
5 CTL:Rm: START dos*
6 WAIT 10 s
7 CTL:Rm: START device1
8 SCN:Rm : End1
9 STIR: * : OFF s
10 LIFT: 1 : shift mm
11 WAIT 3 s
12 SHIFTRATE: - 20
13 MOVE 1 : spec.1
14 LIFT: 1 : work mm
15 STIR: * : ON s
16 WAIT 5 s
17 STIR: * : OFF s
18 LIFT: 1 : shift mm
19 WAIT 3 s
>final sequence
1 MOVE 1 : spec.1
2 LIFT: 1 : work mm
>changer settings
rack number 0
lift rate 25 mm/s
shift rate 20
shift direction: auto.
beaker test mode: single
on beaker error: MOVE
>stirring rates
stirrer 1 3
stirrer 2 3
>dosing unit def.
>manual stop
CTL Rmt: STOP device1
CTL RS232:

------------

¬ report header with program version

¬ method name
¬ number of samples (here full rack)

¬ initialize remote line
¬ initialize

sample position

¬ shift direction to increasing numbers
¬ move next sample beaker to tower
¬ run lift with titration head to working position
¬ switch on stirrer
¬ start dosing device
¬ wait for 10 seconds
¬ start titrator
¬ wait for end of titration [EOD]
¬ switch off stirrer
¬ run lift with titration head to shift position
¬ wait for 3 seconds
¬ shift direction to decreasing numbers
¬ move special beaker to tower
¬ run lift to work position to immerse sensor
¬ switch on stirrer
¬ wait for 5 seconds
¬ switch off stirrer
¬ run lift to shift position
¬ wait for 3 seconds

¬ move special beaker to tower for conditioning
¬ run lift to work position to immerse sensor

------ settings of sampler functions --------------------

¬ on missing sample beaker, the next one is
selected automatically

------ stirring rates ----------------------------------------­¬ cannot be selected independently

------ settings for dosing devices ------------------------

------ action after manual stop ------------------------­¬ stop device 1

760 Sample Changer, Appendix

26

4.2 Method Listings

Methode 3

760 Sample Changer 760.0012
parameters
method 760_3
number of samples: rack
>start sequence
1 CTL:Rm: INIT
2 SAMPLE: - 1
3 SAMPLE: + 1
>sample sequence
1 SHIFTRATE: + 20
2 MOVE 1 : sample
3 LIFT: 1 : work mm
4 STIR: * : ON s
5 CTL:Rm: START dos*
6 WAIT 10 s
7 CTL:Rm: START device1
8 SCN:Rm : End1
9 STIR: * : OFF s
10 LIFT: 1 : shift mm
11 WAIT 3 s
12 SHIFTRATE: - 20
13 MOVE 1 : spec.1
14 LIFT: 1 : work mm
15 CTL:Rm: ****1*********
16 CTL:Rm: ****0*********
17 SCN:Rm : ******1*
18 LIFT: 1 : shift mm
19 WAIT 3 s
>final sequence
1 MOVE 1 : spec.1
2 LIFT: 1 : work mm
>changer settings
rack number 0
lift rate 25 mm/s
shift rate 20
shift direction: auto.
Beaker test mode: single
on beaker error: MOVE
>stirring rates
stirrer 1 3
stirrer 2 3
>dosing unit def.
>manual stop
CTL Rmt: STOP device1
CTL RS232:

------------

report header with program version

¬ method name
¬ number of samples (here full rack)

¬ initialize remote line
¬ initialize

sample position

¬ shift direction to increasing numbers
¬ move next sample beaker to tower
¬ run lift with titration head to working position
¬ switch on stirrer
¬ start dosing device
¬ wait for 10 seconds
¬ start titrator
¬ wait for end of titration [EOD]
¬ switch off stirrer
¬ run lift with titration head to shift position
¬ wait for 3 seconds
¬ shift direction to decreasing numbers
¬ move special beaker to tower
¬ run lift to work position to immerse sensor
¬ switch on external pump
¬ reset remote line
¬ wait for ready signal of pump
¬ run lift to shift position
¬ wait for 3 seconds

¬ move special beaker to tower for conditioning
¬ run lift to work position to immerse sensor

------ settings of sampler functions --------------------

¬ on missing sample beaker, the next one is
selected automatically

------ stirring rates ----------------------------------------­¬ cannot be selected independently

------ settings for dosing devices ------------------------

------ action after manual stop ------------------------­¬ stop device 1

760 Sample Changer, Appendix

27

4.2 Method Listings

Methode 4

760 Sample Changer 760.0012
parameters
method 760_4
number of samples: rack
>start sequence
1 CTL:Rm: INIT
2 SAMPLE: - 1
3 SAMPLE: + 1
>sample sequence
1 MOVE 1 : sample
2 LIFT: 1 : work mm
3 STIR: * : ON s
4 CTL:Rm: START dos*
5 WAIT 10 s
6 CTL:Rm: START device1
7 SCN:Rm : End1
8 STIR: * : OFF s
9 LIFT: 1 : rinse mm
10 CTL:Rm: ****1*********
11 CTL:Rm: ****0*********
12 SCN:Rm : ******1*
13 LIFT: 1 : shift mm
14 WAIT 3 s
>final sequence
1 MOVE 1 : spec.1
2 LIFT: 1 : work mm
>changer settings
rack number 0
lift rate 1 25 mm/s
shift rate 20
shift direction: auto.
beaker test mode: single
on beaker error: MOVE
>stirring rates
stirrer 1 3
stirrer 2 3
>dosing unit def.
>manual stop
CTL Rmt: STOP device1
CTL RS232:

------------

¬ report header with program version

¬ method name
¬ number of samples (here full rack)

¬ initialize remote line
¬ initialize

sample position

¬ move next sample beaker to tower
¬ run lift with titration head to working position
¬ switch on stirrer
¬ start dosing device
¬ wait for 10 seconds
¬ start titrator
¬ wait for end of titration [EOD]
¬ switch off stirrer
¬ run lift with titration head to shift position
¬ switch on external pump
¬ reset remote line
¬ wait for ready signal of pump
¬ run lift to shift position
¬ wait for 3 seconds

¬ move special beaker to tower for conditioning
¬ run lift to work position to immerse sensor

------ settings of sampler functions --------------------

¬ on missing sample beaker, the next one is
selected automatically

------ stirring rates ----------------------------------------­¬ cannot be selected independently

------ settings for dosing devices ------------------------

------ action after manual stop ------------------------­¬ stop device 1

760 Sample Changer, Appendix

28

4.3 Technical Specifications

4.3 Technical Specifications

Dimensions Height: 0.79 m, Width: 0.28 m, Depth: 0.48 m
Weight 12.5 kg
Material Sample Changer case: metal case, multiple enamelling

Splash protection: Polymethylene methacrylate (PMMA)
Sample rack: Acrylnitrile butadiene styrene (ABS)
or Polypropylene (PP)

Lift path 235 mm
Lift Load: approx. 10 N

Stroke speed: adjustable, 3...25 mm/s

Turntable Turning speed: 20 angular degrees/s
Stirrer Stirring rate: adjustable to 15 levels

- magnet stirrer 180/min...2600/min

- rod stirrer 180/min...3000/min
Remote Interface Programmable parallel interface for controlling external

instruments

t

p

Input:

t

>20 ms

p

t

Output:

V

p

CEO

t

>200 ms

p

= 40 V

IC = 20 mA
+5 V: maximum load = 20 mA

Temperatures Nominal functional range 5...40 °C at 20…80% rel. humidity
Transport und storage –20...+60 °C
60 °C rel. humidity < 50%
50 °C rel. humidity < 85%
40 °C rel. humidity <95%

Power connection Voltage 100...120 V, 220...240 V
Frequency 50...60 Hz
Power input 40 VA
Fuses 0.5 AT (110 V), 0.25 AT (220 V)

+5V

active = low
inactive = high

active = low
inactive = high

All data are typical values with the exception of those specially marked.

Safety Specifications

Constructed and tested according to IEC 1010 / EN 61010 /
UL 3101-1, Safety Class III
Degree of protection IP 22

The instruction manual contains information and warnings which
the user should follow to guarantee the safe operation of the in­strument.

760 Sample Changer, Appendix

29

4.4 Servicing and Maintenance

Electromagnetic Compatibility (EMC)

Emitted Interference: The instrument complies with the basic specifications

EN 50081-1/2 1992, EN 55011 (class B), EN 55022 (class B).

Interference immunity: The basic specifications EN 50082-1 1997, and IEC 801-2 to

IEC 801-4 are adhered to.

4.4 Servicing and Maintenance

4.4.1 Servicing

The maintenance of the 760 Sample Changer should include a
yearly service check carried out by a specialist from Metrohm. If
caustic or corrosive chemicals are frequently used, shorter time in­tervals between service checks can be necessary.

The Metrohm Service Department can offer technical advice
regarding servicing and maintenance of all Metrohm instruments at
any time.

4.4.2 Maintenance / Attendance

Not only highly sensitive measuring instruments do require proper
care, a sample changer also requires this. Serious contaminations
can lead to functional disorders and a shortened life-span of the
rugged mechanics and electronics of the sample changer.

Heavy soiling of the titration heads can influence the results of
measurements. Regular cleaning of exposed parts can prevent
this for the most part.

Chemical or solvent spills should be cleaned up immediately. The
connectors (in particular the power supply) should be protected
from contamination. The sample changer should never be oper­ated without the covering foreseen for this purpose.

If corrosive media has entered the inside of the instrument, the
power plug has to be disconnected immediately to avoid massive
damage to the instruments electronic components. In case of such
damage, the Metrohm service personnel should be notified.

The instrument should not be opened by untrained personnel.

760 Sample Changer, Appendix

30

4.5 Warranty and Conformity

4.5 Warranty and ConformityWarranty and Conformity

4.5.1 Warranty

The warranty on our products is limited to defects that are trace­able to material, construction or manufacturing error which occur
within 12 months from the day of delivery. In this case, the defects
will be rectified in our workshops free of charge. Transport costs
are to be paid by the customer.

For day and night operation, the warranty is limited to 6 months.
Glass breakage in the case of electrodes or other parts is not cov-

ered by the warranty. Checks which are not a result of material or
manufacturing faults are also charged during the warranty period.
For parts of outside manufacture insofar as these constitute an
appreciable part of our instrument, the warranty stipulations of the
manufacturer in question apply.

With the regard to the guarantee of accuracy, the technical specifi­cations in the instruction manual are authoritative.

Concerning defects in material, construction or design as well as
the absence of guaranteed features, the orderer has no rights or
claims except those mentioned above.

If damage of the packaging is evident on receipt of a consignment
or if the goods show signs of transport damage after unpacking,
the carrier must be informed immediately and a written damage
report demanded. lack of an official damage report releases
Metrohm from any liability to pay compensation.

If any instruments and parts have to be returned, the original pack­aging should be used if at all possible. This applies above all to in­struments, electrodes, burette cylinders and PTFE pistons. Before
embedment in wood shavings or similar material, the parts must
be packed in a dustproof package (for instruments, use of a plastic
bag is imperative). If open assemblies are enclosed in the scope of
delivery that are sensitive to electromagnetic voltages (e.g. data
interfaces etc.) these must be returned in the associated original
protective packaging (e.g. conductive protective bag). (Exception:
assemblies with built-in voltage source belong in a non-conductive
protective packaging).

For damage which arises as a result of non-compliance with these
instructions, no warranty responsibility whatsoever will be ac­cepted by Metrohm.

760 Sample Changer, Appendix

31

4.5 Warranty and Conformity

4.5.2 Certificate of Conformity and System Validation for the
760 Sample Changer

This is to certify the conformity to the standard specifications for electrical
appliances and accessories, as well as to the standard specifications for
security and to system validation issued by the manufacturing company.

Name of commodity: 760 Sample Changer
System software: Stored in ROMs
Name of manufacturer: Metrohm Ltd., Herisau, Switzerland
Principal technical information: Voltages: 100…120, 220…240 V
Frequency: 50…60 Hz

This Metrohm instrument has been built and has undergone final type testing
according to the standards:

Electromagnetic compatibility

IEC 801-2 (level 3), IEC 801-3 (level 2), IEC 801-4 (level 3),
EN 55011 / class B, EN 55022 / class B, EN 50081-1/2 1992,
EN 50082-1 1997

Security specifications

IEC 1010, EN 61010, UL 3101-1

It has also been certified by the Swiss Electronical Association (SEV), which is
member of the International Certification Body (CB / IEC).
The technical specifications are documented in the instruction manual.

The system software, stored in Read Only Memories (ROMs) has been vali­dated in connection with standard operating procedures in respect to function­ality and performance. The features of the system software are documented in
the instruction manual.

Metrohm Ltd. is holder of the SQS certificate of the quality system ISO 9001
for quality assurance in design/development, production, installation and ser­vicing.

Herisau, March 5th, 1998

Dr. J. Frank Ch. Buchmann

Development Manager Production and
Quality Assurance Manager

760 Sample Changer, Appendix

32

4.5 Warranty and Conformity

Ionenanalytik • Analyse des ions • Ion analysis • Análisis iónico

760 Sample Changer

EU Declaration of Conformity

The Metrohm AG company, Herisau, Switzerland hereby certifies that the instrument:

760 Sample Changer

meets the requirements of EU Directives 89/336/EWG and 73/23/EWG.

Source of specifications:

EN 50081 Electromagnetic compatibility, basic specification Emitted Interference
EN 50082-1 Electromagnetic compatibility, basic specification Interference Immunity
EN 61010 Safety requirements for electrical laboratory measurement and control

equipment

Description of the instrument:

Sample changer for the automation of batch processing of larger sample series, apply­ing titration, dosing and measuring methods in laboratory and industry.

Herisau, March 5th, 1998

Dr. J. Frank Ch. Buchmann

Development Manager Production and
Quality Assurance Manager

760 Sample Changer, Appendix

33

4.6 Accessories

4.6 Accessories

760 Sample Changer 2.760.0010
includes the following accessories: Number

of pieces
SGJ14 sleeve 2 6.1236.020
FEP tubing connector M6 80cm 6.1805.110
Spiral band 7x0,75 0,5m 6.1815.010
Keyboard for 760 6.2142.100
Guiding sleeve 3 6.2709.070
Splash protection 6.2751.010
Plug cover 6.2752.010
Instructions for use 8.760.1013

760 Sample Changer KFT 2.760.0020
includes the following accessories: Number

of pieces
Magnetic stirrer 1.741.0010
Double Pt electrode 6.0340.000
Sample beaker 24 6.1432.210
Titration head for FKT 6.1458.030
FEP tubing connector M6 80cm 2 6.1805.110
Spiral band 7x0,75 0,5m 6.1815.010
Aspirating tube for 676 (Behr) 6.1821.000
Stirring bar 12mm 24 6.1903.010
Foil holder for beaker 6.1432.210 24 6.2037.040
Sample rack 24x75ml M24-0 6.2041.340
Cable 760-Titrino-765/776 6.2141.040
Keyboard for 760 6.2142.100
Splash protection 6.2751.010
Plug cover 6.2752.010
Al foil 0,010/80mm 1000 sheets 6.2820.000
O-ring 5,28/1,78 4 E.301.0022
O-ring 30/5 E.301.0080
Instructions for use 8.760.1013

760 Sample Changer, Appendix

34

4.6 Accessories

Options

Accessories to separate order at additional charge:

722 Propeller Rod Stirrer for Sample Changer

Propeller rod stirrer 2.722.0020
Stirring propeller PP (104 mm) (incl.) 6.1909.020

741 Magnetic Stirrer

Magnetic stirrer 2.741.0010
Macro titration head (6 x SGJ 14, 3 x SGJ 9) 6.1458.010

Micro titration head (4 x M10) for rack 6.2041.340 6.1458.020

Sample Racks and Beakers

Sample Rack 12 x 250 mL M12-0 6.2041.310

Metrohm sample beaker glass 250 mL 6.1432.320
Metrohm sample beaker PP 200 mL 6.1453.220
Metrohm sample beaker PP 250 mL 6.1453.250
Sample Rack 12 x 150 mL M12-0 6.2041.360
for 150 mL standard beaker (high form) or
200 mL disposable beaker (Euro) PP 1000 pcs. 6.1459.310
Sample Rack 14 x 200 mL M14-0 6.2041.370
for 200 mL disposable beaker (Euro) PP 6.1459.310
Sample Rack 14 x 8 oz M14-0 6.2041.380
for disposable beaker (US) PP 8 oz
Sample Rack 16 x 150 mL M16-0 6.2041.320
for standard beaker (high form)
Sample Rack 16 x 120 mL M16-0 6.2041.390
for disposable beaker (US) 120 mL
Sample Rack 24 x 75 mL M24-0 6.2041.340
for Metrohm glass beaker 75 mL 6.1432.210
(Micro titration head necessary)

760 Sample Changer, Appendix

35

4.6 Accessories

Electrodes for sample changer

For titrations with the macro titration head it is advisable to use
long life LL electrodes. Titrodes without standard ground joint
should be used with the SGJ sleeve 6.1236.040 made of silicone
rubber.

For direct titrations using the micro titration head, the following
special micro electrodes can be used:

LL Combined pH micro-electrode 16 cm 6.0234.110
Micro reference electrode Ag/AgCl 16 cm 6.0736.110
Micro pH glass electrode 16 cm 6.0134.110
Micro Ag-titrode 16 cm 6.0433.110
Micro-Pt-titrode 16 cm 6.0434.110
Micro Au-titrode 16 cm 6.0435.110
Pt 1000 Temperature sensor 16 cm 6.1110.110

Dosing Instruments

Dosimat 765 2.765.0010

Dosimat 776 2.776.0010

Exchange unit with ceramics stopcock 1 mL 6.3013.113
5 mL 6.3013.153
10 mL 6.3013.213
20 mL 6.3013.223
50 mL 6.3013.253

Exchange unit with PTFE stopcock 1 mL 6.3014.113
5 mL 6.3014.153
10 mL 6.3014.213
20 mL 6.3014.223
50 mL 6.3014.253

760 Sample Changer, Appendix

36

5 Index

5 Index

A

Accessories...................... 34

Aluminium foil................... 10

Appendix.......................... 23

Aspiration tip......................8

B

Basic mode...................... 16

Basic settings................... 15

Battery............................. 23

Beaker test......................... 3

Burette tip..........................8

C

Certificate of Conformity.... 32

Configuration procedure.... 17

Connecting the keyboard.....7

Connectors.....................2, 3

D

Declaration of conformity... 33

Dimensions...................... 29

Dosimat ........................... 13

Dosing instruments........... 36

Double-Pt Electrode............9

E

Electrode.......................8, 36

Electrode rinsing............... 21

Electromagn. compatibility. 30

End of determ. (EOD) ....... 13

Environment.......................4

Error message.................. 23

External pump.............13, 22

F

Features .......................... 15

Foil holder........................ 10

Fuse..................................4

G

Guiding sleeve....................8

H

<HOLD> key .................... 16

I

Infrared sensor................... 3

Input ...........................11, 29

Installation..........................4

Instrument combinations ... 12

Instrument opening............. 6

Introduction...................... 15

K

Key functions.................... 16

Keyboard connector............ 3

KF sample beaker............. 10

KF titration head................. 9

L

LED................................. 16

Lift................................1, 29

Limitations........................ 15

Line frame...................... 1, 2

Line sleeve.....................1, 2

M

Macro titration head............ 8

Magnet holder ................ 3, 7

Magnetic sensor............. 3, 7

Magnetic stirrer...................7

Maintenance /Attendance.. 30

Manufacturing number ........3

Material............................ 29

Memory initialization ......... 17

Method listing................... 25

Methods........................... 20

Metrohm Service.............. 30

Micro electrode................... 8

Micro titration head .............8

Mounting screws.................8

O

Options............................ 35

O-Ring...............................9

Output.........................11, 29

Overview.......................1, 15

P

Packaging..........................4

parallel cable......................2

Pin assignment................. 11

Plug cover.......................... 1

Power connection............. 29

Power on.......................... 16

Power supply......................4

Procedure........................ 20

Pump control.................... 13

R

Rack.............................7, 14

Rack code.......................... 3

Rear view...........................2

Remote commands......12, 13

Remote connections .........11

Remote interface.........13, 29

Remote socket.............. 2, 11

Rinsing.............................21

Rinsing position................ 18

Rod stirrer..........................8

Rotating nozzle...................8

S

Safety considerations..........6

Safety measures.................6

Safety specification...........29

Sample beaker for KF

titration......................... 10

Sample rack................. 7, 14

Sensors..............................3

Servicing..........................30

Setting up....................... 4, 7

Shift position.....................18

Side view............................1

Signals............................. 11

Sleeves..............................8

Splash protection................1

Spray nozzle.......................8

Standard sample racks...... 14

<START> key................... 16

Stirrer...............................29

Stirrer propeller...................8

Stirrer rail....................... 1, 7

Stirrer sockets.....................2

Stirrer speed..................... 19

Stirring rate.......................29

<STOP> key.....................16

T

Technical specifications.....29

Temperatures................... 29

Thread stopper ...................8

Titration head .....................8

Titration head KFT..............9

Titrino..........................12, 13

Tower.................................1

Turntable.....................14, 29

W

Warranty and conformity....31

Weight ............................. 29

Working position...............18

760 Sample Changer, Index

37