Metrohm 807 User manual

807 Dosing Unit
Manual
8.807.8002EN / 2019-09-26

Metrohm AG
CH-9100 Herisau
Switzerland
Phone [phone]
Fax [phone]
[email protected]
www.metrohm.com
807 Dosing Unit
Manual
8.807.8002EN / 2019-09-26

Technical Communication
Metrohm AG
CH-9100 Herisau
[email protected]
This documentation is protected by copyright. All rights reserved.
This documentation has been prepared with great care. However, errors
can never be entirely ruled out. Please send comments regarding possible
errors to the address above.

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ Table of contents
807 Dosing Unit ￭￭￭￭￭￭￭￭ III
Table of contents
1 Introduction 1
1.1 Instrument description ......................................................... 1
1.2 Model versions ...................................................................... 1
1.3 About the documentation ................................................... 2
1.3.1 Symbols and conventions ........................................................ 2
1.4 Safety instructions ................................................................ 3
1.4.1 Tubing and capillary connections ............................................. 3
1.4.2 Flammable solvents and chemicals ........................................... 3
1.5 Recycling and disposal ......................................................... 4
2 Construction of the 807 Dosing Unit 5
2.1 Total view .............................................................................. 5
2.2 Components of the 807 Dosing Unit .................................. 6
2.3 Cylinder unit .......................................................................... 8
2.4 Connectors (ports) of the 807 Dosing Unit ........................ 9
3 Installation 10
3.1 Greasing the dosing unit .................................................... 10
3.2 Mounting the storage vessel and the holder ................... 11
3.3 Mounting the adsorber tube ............................................. 14
3.4 Mounting filling tubes ........................................................ 15
3.5 Mounting the dosing unit onto the bottle ....................... 15
3.5.1 Mounting the dosing unit onto the bottle .............................. 15
3.5.2 Mounting the dosing tubing and buret tips ............................ 17
3.5.3 Buret tips ............................................................................... 18
3.6 Avoiding air bubbles .......................................................... 19
3.7 Disassembling the dosing unit .......................................... 21
3.7.1 Disassembling the dosing unit ................................................ 21
3.8 Assembling the dosing unit ............................................... 26
3.8.1 Inserting the dosing piston .................................................... 26
3.8.2 Attaching cylinder unit in distributor ...................................... 28
3.8.3 Attaching the housing ........................................................... 28
4 Handling and maintenance 31
4.1 Care and upkeep ................................................................. 31
4.1.1 Cleaning dosing cylinder and dosing piston ........................... 31
4.1.2 Cleaning valve disc and distributor disc .................................. 32

Table of contents ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
IV ￭￭￭￭￭￭￭￭ 807 Dosing Unit
4.1.3 Discs adhere to one another .................................................. 33
4.1.4 Resistance and materials ........................................................ 34
4.2 GLP - Validation .................................................................. 35
5 Troubleshooting 37
5.1 Problems .............................................................................. 37
6 Appendix 40
6.1 Buret data ........................................................................... 40
6.2 Dosing accuracy .................................................................. 41
6.2.1 Typical measurement deviation .............................................. 41
6.2.2 The ISO/EN/DIN standard 8655-3 ........................................... 41
7 Accessories 43
Index 44

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ Table of figures
807 Dosing Unit ￭￭￭￭￭￭￭￭ V
Table of figures
Figure 1 807 Dosing Unit ................................................................................ 5
Figure 2 807 Dosing Unit - Components ......................................................... 6
Figure 3 Cylinder unit ...................................................................................... 8
Figure 4 807 Dosing Unit - Ports ..................................................................... 9
Figure 5 Removing the housing ..................................................................... 10
Figure 6 Greasing the centering tube and interior edges of the housing ........ 11
Figure 7 Mounting the storage vessel and the holder .................................... 12
Figure 8 Marking rib on housing and distributor ............................................ 13
Figure 9 Locking the housing ........................................................................ 13
Figure 10 Mounting the adsorber tube ........................................................... 14
Figure 11 Mounting filling tubes ..................................................................... 15
Figure 12 Dosing unit on the reagent bottle .................................................... 16
Figure 13 Mounting the tubing and the buret tip ............................................ 17
Figure 14 Air bubbles in the cylinder ............................................................... 20
Figure 15 Removing the housing ..................................................................... 22
Figure 16 Cylinder unit on the distributor ........................................................ 23
Figure 17 Dosing cylinder damaged ................................................................ 23
Figure 18 Dosing cylinder with dosing piston .................................................. 25
Figure 19 Inserting the dosing piston .............................................................. 26
Figure 20 Centering tube on the dosing cylinder ............................................. 27
Figure 21 Stopper of the dosing piston flush with the upper edge of the hous-
ing .................................................................................................. 27
Figure 22 Marking ribs on the centering tube and edge of the distributor ....... 28
Figure 23 Marking rib on housing and distributor ............................................ 29
Figure 24 Locking the housing ........................................................................ 29
Figure 25 Piston stopper flush with the upper edge of the housing ................. 30
Figure 26 Triangles on the upper side of the dosing unit when the stopcock is set
correctly .......................................................................................... 30
Figure 27 Dosing unit completely mounted ..................................................... 30
Figure 28 Valve disc in the cylinder base .......................................................... 32
Figure 29 Distributor disc with 4 ports (in the distributor) ................................ 32
Figure 30 Data chip and contact pin ............................................................... 41

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ 1 Introduction
807 Dosing Unit ￭￭￭￭￭￭￭￭ 1
1 Introduction
1.1 Instrument description
The 807 Dosing Unit is a versatile buret unit which can be operated with a
700 Dosino or 800 Dosino dosing drive. The 807 Dosing Unit is suitable
for precise dosings, titrations, pipetting procedures, sample transfers, etc.
The four inputs and outputs (ports) are designed for flexible use (presum-
ing the presence of a suitable control device).
Thanks to the transparent housing of the 807 Dosing Unit, piston move-
ments and stopcock rotations are visible. This means that even complex
liquid handling applications are easy to monitor. The unobstructed view
into the dosing cylinder also ensures that solutions can be monitored with
respect to the absence of bubbles and the leak-tightness of the cylinder
unit.
Specifications concerning the dosing unit and the reagent can be stored in
the integrated data chip. This data can be extracted and updated by a
suitable control device.
1.2 Model versions
The 807 Dosing Unit is available with cylinder sizes of 2 mL, 5 mL, 10 mL,
20 mL and 50 mL. In addition to glass cylinders, plastic cylinders (ETFE)
specially manufactured for alkali and other aggressive solutions are also
available.
Table 1 807 Dosing Unit with glass cylinder
Volume Order number
2 mL 6.3032.120
5 mL 6.3032.150
10 mL 6.3032.210
20 mL 6.3032.220
50 mL 6.3032.250
Table 2 807 Dosing Unit with ETFE cylinder
Volume Order number
2 mL 6.1575.120

1.3 About the documentation ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
2￭￭￭￭￭￭￭￭ 807 Dosing Unit
Volume Order number
5 mL 6.1575.150
10 mL 6.1575.210
20 mL 6.1575.220
50 mL 6.1575.250
1.3 About the documentation
CAUTION
Please read through this documentation carefully before putting the
instrument into operation. The documentation contains information
and warnings which the user must follow in order to ensure safe opera-
tion of the instrument.
1.3.1 Symbols and conventions
The following symbols and styles are used in this documentation:
Cross-reference to figure legend
The first number refers to the figure number, the sec-
ond to the instrument part in the figure.
Instruction step
Carry out these steps in the sequence shown.
Warning
This symbol draws attention to a possible life hazard
or risk of injury.
Warning
This symbol draws attention to a possible hazard due
to electrical current.
Warning
This symbol draws attention to a possible hazard due
to heat or hot instrument parts.
Warning
This symbol draws attention to a possible biological
hazard.

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ 1 Introduction
807 Dosing Unit ￭￭￭￭￭￭￭￭ 3
Caution
This symbol draws attention to a possible damage of
instruments or instrument parts.
Note
This symbol marks additional information and tips.
1.4 Safety instructions
1.4.1 Tubing and capillary connections
CAUTION
Leaks in tubing and capillary connections are a safety risk. Tighten all
connections well by hand. Avoid applying excessive force to tubing con-
nections. Damaged tubing ends lead to leakage. Appropriate tools can
be used to loosen connections.
Check the connections regularly for leakage. If the instrument is used
mainly in unattended operation, then weekly inspections are manda-
tory.
1.4.2 Flammable solvents and chemicals
WARNING
All relevant safety measures are to be observed when working with
flammable solvents and chemicals.
￭Set up the instrument in a well-ventilated location.
￭Keep all sources of flame far from the workplace.
￭Clean up spilled fluids and solids immediately.
￭Follow the safety instructions of the chemical manufacturer.

1.5 Recycling and disposal ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
4￭￭￭￭￭￭￭￭ 807 Dosing Unit
1.5 Recycling and disposal
This product is covered by European Directive 2012/19/EU, WEEE – Waste
Electrical and Electronic Equipment.
The correct disposal of your old instrument will help to prevent negative
effects on the environment and public health.
More details about the disposal of your old instrument can be obtained
from your local authorities, from waste disposal companies or from your
local dealer.

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ 2 Construction of the 807 Dosing Unit
807 Dosing Unit ￭￭￭￭￭￭￭￭ 5
2 Construction of the 807 Dosing Unit
2.1 Total view
2
1
2
3
4
5
6
7
8
9
10
11
12
Figure 1 807 Dosing Unit
1Data chip
Contains all specifications for the dosing
unit.
2Coding magnet
For automatic recognition of the volume of
the dosing unit.
3Housing
With data chip, coding magnets, locking
button and specifications concerning the
dosing unit.
4Port 1
Dosing port 1. Dosing output for solution.
5Fixing ring
For fastening the dosing unit onto a reagent
bottle.
6Centering tube
Is actuated by Dosino and rotates the entire
inner cylinder unit, together with dosing cyl-
inder, cylinder base and the integrated valve
disc.
7Serial number, order number and bar-
code
8Port display
Displays the port currently opened.
9Nominal volume
Volume of the dosing cylinder.
10 Locking button
For locking and unlocking the housing.
11 Port 3
Dosing port 2. Dosing output for solution.
12 VENT port
For deaerating the reagent bottle.

2.2 Components of the 807 Dosing Unit ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
6￭￭￭￭￭￭￭￭ 807 Dosing Unit
2.2 Components of the 807 Dosing Unit
1
2
3
4
5
6
7
8
9
10
11
Figure 2 807 Dosing Unit - Components
1Data chip
Contains all specifications for the dosing
unit.
2Coding magnet(s)
For automatic recognition of the volume of
the dosing unit.

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ 2 Construction of the 807 Dosing Unit
807 Dosing Unit ￭￭￭￭￭￭￭￭ 7
3Housing
With data chip, coding magnets, locking
button and specifications concerning the
dosing unit.
Material: PETG or PVDF
4Centering tube
Is actuated by Dosino and rotates the entire
inner cylinder unit, together with dosing cyl-
inder, cylinder base and the integrated valve
disc.
Material: PETG or PVDF
5Spring clip
Material: PETG or PVDF
6Dosing cylinder
Contains the solution for dosing. Volume
2 mL , 5 mL , 10 mL , 20 mL or 50 mL .
Material: Borosilicate 3.3 or ETFE
7Cylinder base
Seals the dosing cylinder and contains the
valve disc.
Material: PTFE / Graphite
8Valve disc
A hole in the valve disc guides the solution
into one (of four) selected openings in the
distributor disc.
Material: Silicone carbide ceramic
9Distributor disc
The four holes in the distributor disc each
set up a connection with one of the four
ports (input/output) of the dosing unit.
Material: Al 2 O 3 ceramic
10 Distributor
Contains four ports (input/output) for solu-
tions. The ports are actuated by the distribu-
tor disc in the distributor and the valve disc
in the base of the cylinder.
Material: ETFE
11 Fixing ring
For fastening the dosing unit onto a reagent
bottle.
Material: PVDF

2.3 Cylinder unit ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
8￭￭￭￭￭￭￭￭ 807 Dosing Unit
2.3 Cylinder unit
1
2
3
4
5
Figure 3 Cylinder unit
1Piston stopper
Coupling for the piston rod of the Dosino.
2Dosing piston
For ejecting and aspirating a solution.
Material: ETFE
3Dosing cylinder (Glass: 6.1574.XXX,
ETFE: 6.1575.XXX)
Contains the solution for dosing. Volume
2 mL , 5 mL, 10 mL, 20 mL or 50 mL.
Material: Borosilicate 3.3 or ETFE
4Centering tube
Is actuated by Dosino and rotates the entire
inner cylinder unit, together with dosing cyl-
inder, cylinder base and the valve disc moun-
ted within.
Material: PETG or PVDF
5Cylinder base
Seals the dosing cylinder and contains the
valve disc.
Material: PTFE / Graphite

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ 2 Construction of the 807 Dosing Unit
807 Dosing Unit ￭￭￭￭￭￭￭￭ 9
2.4 Connectors (ports) of the 807 Dosing Unit
1
3
4
5
2
Figure 4 807 Dosing Unit - Ports
1Port 1
Connector (M6) for the dosing tubing.
2VENT
Deaeration, connection (M6) for adsorber
tube.
3Port 4
Special port, waste port or recycling port.
4Port 3
Connector (M6) for a second dosing tubing.
5Port 2
Connector (M6) for the filling tubing.
WARNING
Port 2 is the fill port in the default configuration. Take care to ensure
that the tubing is firmly screwed in place in order that no air bubbles
will be able to enter during aspiration of the reagent solution. Always
use the 6.2739.000 wrench provided for tightening and unscrewing
tubing connections.

3.1 Greasing the dosing unit ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
10 ￭￭￭￭￭￭￭￭ 807 Dosing Unit
3 Installation
3.1 Greasing the dosing unit
We recommend that the upper side of the centering tube and interior
edges of the upper side of the housing be greased with paraffin grease
6.2803.010 before the dosing unit is used for the first time. This measure
will reduce friction resistance when the centering tube is rotated.
Removing the housing
Figure 5 Removing the housing
Remove the housing of the dosing unit as follows:
1Place the dosing unit on a flat, level surface so that the lettering of
the volume specification faces towards the front.
2Keep the locking button pressed down.
3Rotate the housing of the dosing unit by ca. 1 cm to the right (in
counterclockwise direction).
4Release the locking button.
5Carefully raise the housing upward.
When removing the housing, take care to ensure that the spring clip
on the interior side of the housing does not slide out of place.

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ 3 Installation
807 Dosing Unit ￭￭￭￭￭￭￭￭ 11
Greasing the centering tube and housing
1
1
2
Figure 6 Greasing the centering tube and interior edges of the housing
Grease the centering tube and housing as follows:
1Grease the sliding surfaces on the upper side of the centering tube
with paraffin grease 6.2803.010.
2Grease the sliding surfaces on the interior edge of the housing with
paraffin grease 6.2803.010.
3.2 Mounting the storage vessel and the holder
The dosing unit comes equipped with a storage vessel 6.2008.030 with
holder 6.2008.050 for the storage of the buret tip. It should be mounted
when the device is started up for the first time.
The storage vessel serves as a storage container for the buret tip when the
dosing unit is not in use.
The associated holder is used at the same time for mounting a name plate
with the designation of the reagent in the dosing unit. Name plates can
be reordered under the order number 6.2244.020 from any Metrohm
agent.
The dosing unit housing must be removed in order to assemble the stor-
age vessel holder (see "Removing the housing", page 10).

3.2 Mounting the storage vessel and the holder ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
12 ￭￭￭￭￭￭￭￭ 807 Dosing Unit
Mounting the storage vessel and the holder
6.2008.030
6.2008.050
6.2244.020
2
3
4
5
1
Figure 7 Mounting the storage vessel and the holder
Mount the storage vessel and the holder on the dosing unit as follows:
1Rotate the centering tube on the distributor in such a way that the
marking rib on the centering tube is lined up with the marking rib on
the edge of the distributor.
2Place the holder 6.2008.050 on the edge of the distributor.
3Place the storage vessel 6.2008.030 for the buret tip in the holder.
In order to ensure perfect seating, the rib on the storage vessel must
be guided into the groove on the holder and pushed downward.
The holder can be placed at any one of four positions on the ring of
the distributor.
4Slide the name plate 6.2244.020, which has the designation of the
reagent in the dosing unit, into the holder.
5Slide the housing of the dosing unit onto the centering tube.
The centering tube with the cylinder unit must be in correct position
when the housing is attached. You will find a positioning aid on the
rear side of the dosing unit.