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 [email protected]
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
3.4The 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
760 Sample Changer, Overview 1
1Overview
1.1 Side View
Safety note:
Never operate the 760 Sample Changer without splash protection
and plug cover being mounted. The plug cover prevents any con-
tamination of the connectors, caused by spilled solvents or chemi-
cals.
Splash protection
Plug cover
Rack
Lift
Line sleeve
Line frame
Tower
Connectors
Stirrer rail

1.2 Rear View
760 Sample Changer, Overview
2
The Connectors (side view):
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
Made by Metrohm Herisau Switzerland
Keyboard
Type 1.760.0010 Nr. 0010/01104
Remote socket
Stirrer sockets
Mounting srew
for splash protection
Line sleeve
Plug cover
Keyboard connector
Line frame

1.3 Sensors
760 Sample Changer, Overview 3
Keyboard Connector (rear):
Made by Metrohm Herisau Switzerland
Keyboard
Type 1.760.0010 Nr. 0010/01104
1.3 Sensors
Beaker test
Front view
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.
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 in-
dicator. For this reason the
760 Sample Changer should
be initialized by <RESET> or
turned off and on right after
every rack change.
Keyboard connector
Splash protection
Beaker indicator
Rack
Magnetic indicator
Manufacturing number
Magnet holder

2.1 Setting up the Instrument
760 Sample Changer, Installation
4
2Installation
2.1 Setting up the Instrument
Packaging
The 760 Sample Changer is supplied with the accessories in sepa-
rate 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 acces-
sories 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 main-
tenance 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 rat-
ing, 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:

0Power Supply
760 Sample Changer, Installation 5
•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 volt-
age. The white arrow besides the desired voltage has to point
towards the white block mark printed on the fuse holder's panel
(see below).
220 -
-240 V
100 -
-120 V
220 -
-240 V
100 -
-120 V
100 –120 V
220 –240 V
Power switch
Power plug
Fuse holder

2.2 Safety Considerations
760 Sample Changer, Installation
6
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 con-
tamination of the connectors, caused by spilled solvents or chemi-
cals.
If failure or malfunctioning occurs during operation of the 760 Sam-
ple Changer, the Metrohm Service Department should be
consulted.
If opening the instrument is unavoidable, the following safety pre-
cautions are to be strictly adhered to:
Before opening the instrument disconnect it from all electri-
cal 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 ac-
quainted 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 oper-
ated safely, it must be put out of operation.

2.3 Arranging the Accessories
760 Sample Changer, Installation 7
2.3 Arranging the Accessories
2.3.1 Connecting the Keyboard
Made by Metrohm Herisau Switzerland
Keyboard
Type 1.760.0010 Nr. 0010/01104
The keyboard is to be con-
nected 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
Magnetic stirrers 2.741.0010
may be placed in any position
on the stirrer rail beneath the
rack.
2.3.3 Racks
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).
Rack
Stirrer rail
Magnet holder
Magnetic sensor
Rack

2.3 Arranging the Accessories
760 Sample Changer, Installation
8
2.3.4 Mounting and Setting up the Titration Heads
Macro Titration head
6.1458.010 Micro Titration head 6.1458.020
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
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.
Use only the designated
Micro electrodes with the
Micro Titration head, see
accessory list, page 34.

2.3 Arranging the Accessories
760 Sample Changer, Installation 9
Mounting and Setting up the Titration head KFT
Titration head KFT
6.1458.030
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.
Mounting screws
Double-Pt-Electrode
6.0340.000
Burette tips
6.1543.200
M10 Thread connectors
6.1543.200
O-Rings
E.301.0022
O-Ring (bottom side)
E.301.0080

2.3 Arranging the Accessories
760 Sample Changer, Installation
10
2.3.5 Use of the Sample Beaker for Karl Fischer Titration
For Karl Fischer titration the
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.
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.
Sample beaker
Al foil
Foil holder
6.2037.040

2.4 Remote Connections
760 Sample Changer, Installation 11
2.4 Remote Connections
Remote
760 Sample Changer
Dosimat
765
776
Titrino
Family
718
719
720
736
751
758
784
785
702
716
Relay Box 731
Valves
Pumps,
e.g. 772
Connecting peripheral instruments to the 760 Sample Changer re-
quires 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.

2.4 Remote Connections
760 Sample Changer, Installation
12
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:
Output6
Output7
Output4
Output2
Output0
Output8
Output9
Output10
Input1
Input3
Input5
Input7
Output11
0Volt
+5Volt
Output5
Output3
Output1
Output12
Output13
Input0
Input2
Input4
Input6
0Volt
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
B
ATitrino
C
D
Remote control commands:
Output 0: *************1 starts Titrino
Input 3: ****1*** awaits end of titration (EOD pulse)
Cable 6.2141.020
Inputs
Outputs
+5V
active = low
inactive = high
active = low
inactive = high

2.4 Remote Connections
760 Sample Changer, Installation 13
760 Sample Changer —Titrino —Dosimat 765/776
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
tp >20 ms
Pin 7 Output t
p
tp >200 ms
VCEO = 40 V
IC= 20 mA
Cable 6.2141.040
+5V
active = low
inactive = high
active = low
inactive = high
B
ATitrino
C
DB
A765
C
D

2.5 Racks
760 Sample Changer, Installation
14
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 titra-
tion, various sizes of beakers are common or required, many kinds
of racks can be used and are easily interchangeable. The rack of-
fers space for various numbers of samples depending on the
diameter of the beakers. Metrohm delivers the following predefined
types of standard racks:
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 initial-
ized 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.
Type Number of
beakers Type of beaker Predefined Code Order Number
M12-012 250 mL Metrohm glass beaker 000001 6.2041.310
M12-012 150 mL glass beaker or
200 mL disposable beaker (Euro) 100000 6.2041.360
M14-014 200 mL disposable beaker (Euro) 000011 6.2041.370
M14-014 8 oz disposable beaker (US) 000101 6.2041.380
M16-016 150 mL glass beaker 000010 6.2041.320
M16-016 120 mL disposable beaker (US) 100001 6.2041.390
M24-024 75 mL Metrohm glass beaker 001000 6.2041.340

3.1 Important Features
760 Sample Changer, Introduction 15
3Introduction
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

3.2 Key Functions
760 Sample Changer, Introduction
16
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
Starts processing of a sample series.
STOP
RESET
Stops processing of a sample series or initializes the
760 Sample Changer.
HOLD
Interrupts processing of a sample series, green LED
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 de-
fined.
Configuration Procedure:
(after Power on with <HOLD> pressed, green LED blinks once)
START
Accepts the setting of a value and moves on to the
next value.
HOLD
Learning mode, manual execution of a changer func-
tion for setting a configuration.
STOP
RESET
Cancels a configuration setting and initializes the 760
when <STOP> is pressed twice. Switches back to
basic condition.

3.3 Memory Initialization
760 Sample Changer, Introduction 17
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 instal-
lation of the sample changer.
START HOLD STOP
RESET
and "Power on"
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 posi-
tions 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 cur-
rent step in the configuration procedure.