Metrohm 823 Membrane Pump Unit User manual

823 Membrane Pump Unit
Manual
8.823.8001EN / 2019-11-29

Metrohm AG
CH-9100 Herisau
Switzerland
Phone [phone]
Fax [phone]
[email protected]
www.metrohm.com
823 Membrane Pump Unit
Manual
8.823.8001EN / 2019-11-29

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
￭￭￭￭￭￭￭￭ III
Table of contents
1 Introduction 1
1.1 Instrument description ......................................................... 1
1.1.1 Model versions ........................................................................ 1
1.1.2 Connectors .............................................................................. 2
1.1.3 Intended use ........................................................................... 2
1.2 About the documentation ................................................... 2
1.2.1 Symbols and conventions ........................................................ 2
1.3 Safety instructions ................................................................ 3
1.3.1 General notes on safety ........................................................... 3
1.3.2 Electrical safety ........................................................................ 3
1.3.3 Tubing and capillary connections ............................................. 4
1.3.4 Flammable solvents and chemicals ........................................... 5
1.3.5 Recycling and disposal ............................................................. 5
2 Overview of the instrument 6
2.1 Mode of operation of the membrane pump ...................... 6
3 Installation 8
3.1 Setting up the instrument .................................................... 8
3.1.1 Packaging ................................................................................ 8
3.1.2 Checks .................................................................................... 8
3.1.3 Location .................................................................................. 8
3.2 Installing the inlet tubing and outlet tubing ...................... 8
3.3 Connecting the membrane pump ..................................... 10
3.3.1 Connection to a Sample Processor ......................................... 10
3.3.2 Connection to the 731 Relay Box .......................................... 11
4 Operation 13
5 Operation and maintenance 14
5.1 General notes ...................................................................... 14
5.1.1 Care ...................................................................................... 14
5.1.2 Maintenance by Metrohm Service .......................................... 14
5.2 Tubings ................................................................................ 15
6 Troubleshooting 16
6.1 Problems .............................................................................. 16
7 Technical specifications 17
7.1 Membrane pump ................................................................ 17

Table of contents ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
IV ￭￭￭￭￭￭￭￭
7.2 Power supply ...................................................................... 17
7.3 Interfaces and connectors ................................................. 17
7.4 Safety specifications ........................................................... 17
7.5 Electromagnetic compatibility (EMC) ................................ 18
7.6 Ambient temperature ......................................................... 18
7.7 Reference conditions .......................................................... 18
7.8 Dimensions/material ........................................................... 19
8 Accessories 20
Index 21

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ Table of figures
￭￭￭￭￭￭￭￭ V
Table of figures
Figure 1 Front 823 Membrane Pump Unit ....................................................... 6
Figure 2 Mode of operation of the membrane pump ...................................... 6
Figure 3 Connecting the tubings ..................................................................... 9
Figure 4 Screwing the union nuts tightly ......................................................... 9
Figure 5 823 Membrane Pump Unit connected directly to the Sample Pro-
cessor ............................................................................................. 10
Figure 6 823 Membrane Pump Unit via the Remote Box and 731 Relay Box .. 11

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ 1 Introduction
￭￭￭￭￭￭￭￭ 1
1 Introduction
1.1 Instrument description
The 823 Membrane Pump Unit is a versatile membrane pump. It was
designed specifically for the production operation and laboratory environ-
ment and enables a wide range of applications. Particularly when used in
a Metrohm automation system with Sample Processor and various analysis
instruments, it is of indisputable service in processing large sample series
in the complete titration area and in various measuring applications or
other analytical tasks.
The 823 Membrane Pump Unit uses the membrane pump principle (see
chapter 2.1, page 6) and is suitable for pumping all types of liquid
media.
NOTICE
The 823 Membrane Pump Unit is not suitable for pumping liquids with
solids content.
The flow rate of at least 450 mL/min opens up a wide range of applica-
tions.
1.1.1 Model versions
The 823 Membrane Pump Unit is available in the following three versions:
2.823.0010 823 Membrane Pump
Unit
2.823.0020 823 Membrane Pump
Unit
with aspiration equip-
ment
2.823.0030 823 Membrane Pump
Unit
with rinsing equipment
Each version includes different accessories according to its use (see chap-
ter 8, page 20).

1.2 About the documentation ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
2￭￭￭￭￭￭￭￭
1.1.2 Connectors
The 823 Membrane Pump Unit needs 16 - 24 V DC voltage.
Power is supplied to the pump via the direct connection to a Sample Pro-
cessor (e.g. 814 or 815) or to the 731 Relay Box (connection via adapter
cable 6.2160.010).
1.1.3 Intended use
The 823 Membrane Pump Unit is designed for usage in automated sys-
tems in analytical laboratories.
This instrument is suitable for pumping chemicals and flammable samples.
Use of the 823 Membrane Pump Unit therefore requires the user to have
basic knowledge and experience in handling toxic and caustic substances.
Knowledge with respect to the application of the fire prevention measures
prescribed for laboratories is also mandatory.
1.2 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.
1.2.1 Symbols and conventions
The following symbols and formatting may appear 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.
Method Dialog text, parameter in the software
File ▶ New Menu or menu item
[Next] Button or key
WARNING
This symbol draws attention to a possible life-threat-
ening hazard or risk of injury.

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ 1 Introduction
￭￭￭￭￭￭￭￭ 3
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.
CAUTION
This symbol draws attention to possible damage to
instruments or instrument parts.
NOTE
This symbol highlights additional information and
tips.
1.3 Safety instructions
1.3.1 General notes on safety
WARNING
Operate this instrument only according to the information contained in
this documentation.
This instrument left the factory in a flawless state in terms of technical
safety. To maintain this state and ensure non-hazardous operation of the
instrument, the following instructions must be observed carefully.
1.3.2 Electrical safety
The electrical safety when working with the instrument is ensured as part
of the international standard IEC 61010.
WARNING
Only personnel qualified by Metrohm are authorized to carry out service
work on electronic components.

1.3 Safety instructions ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
4￭￭￭￭￭￭￭￭
WARNING
Never open the housing of the instrument. The instrument could be
damaged by this. There is also a risk of serious injury if live components
are touched.
There are no parts inside the housing which can be serviced or replaced
by the user.
Supply voltage
WARNING
An incorrect supply voltage can damage the instrument.
Only operate this instrument with a supply voltage specified for it (see
rear panel of the instrument).
Protection against electrostatic charges
WARNING
Electronic components are sensitive to electrostatic charges and can be
destroyed by discharges.
Do not fail to pull the power cord out of the power socket before you
set up or disconnect electrical plug connections at the rear of the
instrument.
1.3.3 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 Introduction
￭￭￭￭￭￭￭￭ 5
1.3.4 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 (e.g. fume cup-
board).
￭Keep all sources of flame far from the workplace.
￭Clean up spilled liquids and solids immediately.
￭Follow the safety instructions of the chemical manufacturer.
1.3.5 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.

2.1 Mode of operation of the membrane pump ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
6￭￭￭￭￭￭￭￭
2 Overview of the instrument
1 2 3456
Figure 1 Front 823 Membrane Pump Unit
1Status LED
For displaying the operating state.
2Inlet connector
With union nut for the aspiration tubing.
3Membrane pump
With arrows to indicate the flow direction.
4Pressurizing valve
5Outlet connector
With union nut for the drainage tubing.
6Connection cable
With M8 plug for connection to a Sample
Processor.
2.1 Mode of operation of the membrane pump
Figure 2 Mode of operation of the membrane pump
1Outlet valve 2Inlet valve

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ 2 Overview of the instrument
￭￭￭￭￭￭￭￭ 7
3Pump chamber 4PTFE membrane
5Eccentric
Principle
The membrane pump is located in the pump head. The membrane made
of PTFE 4 is moved up and down by an eccentric 5. This results in a peri-
odic volume change of the pump chamber 3. On the downstroke, the
medium to be pumped is therefore aspirated through the inlet valve 2. On
the upstroke, the membrane forces the medium out of the pump chamber
through the outlet valve 1.
The following features characterize the membrane pump:
￭Self-aspirating, due to the ingenious membrane technology.
￭Dry run safe, i.e., the pump is not damaged if gases are pumped
instead of liquids.
￭Operational in any position.
￭Small-sized and thus space-saving.
￭High chemical resistance:
As chemically resistant materials such as PTFE, PP and FFPM are used in
all parts that come into contact with the media, nearly all neutral and
aggressive media may be pumped.
NOTICE
If you use particularly aggressive media, make sure that the above-men-
tioned materials are resistant to them prior to using the instrument.
In addition, the membrane pump has a very long lifetime. The only
expendable parts are the membrane and the valve plates.
The dosing accuracy of the membrane pump is considerably further
increased by a valve at the pump outlet. This valve has the following three
functions:
￭Pressurizing function
When media are pumped into systems with fluctuating pressures, into
a vacuum or from an overpressure area, the pressurizing valve ensures
a constant backpressure.
￭Overflow function
The valve prevents an excessive rise in pressure in the system on the
pressure side.
￭Anti-injector function
When the pump is used for dosing into piping systems with high flow
rates, the pressurizing valve prevents an injector effect (aspiration of
ambient air as a result of the underpressure).

3.1 Setting up the instrument ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
8￭￭￭￭￭￭￭￭
3 Installation
3.1 Setting up the instrument
3.1.1 Packaging
The instrument is supplied in protective packaging together with the sepa-
rately packed accessories. Keep this packaging, as only this ensures safe
transportation of the instrument.
3.1.2 Checks
Immediately after receipt, check whether the shipment has arrived com-
plete and without damage by comparing it with the delivery note.
3.1.3 Location
The instrument has been developed for operation indoors and may not be
used in explosive environments.
Place the instrument in a location of the laboratory which is suitable for
operation and free of vibrations and which provides protection against
corrosive atmosphere and contamination by chemicals.
The instrument should be protected against excessive temperature fluctua-
tions and direct sunlight.
3.2 Installing the inlet tubing and outlet tubing
As the inlet tubing and outlet tubing, two different tubing types are avail-
able. Both tubings are included in the scope of delivery:
￭PVC tubing (6.1801.120), 2 x 2 m
￭PTFE tubing (6.1812.000), 1 x 4 m
NOTICE
Which of the two tubings to use depends largely on the solvent used.
PVC tubing is more flexible and has the advantage of making less noise
during the pumping operation. It must be noted that the PVC tubing is
not resistant to solvents.
Install the inlet tubing and outlet tubing as follows:
1Cut the inlet tubing and outlet tubing to the suitable length.

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ 3 Installation
￭￭￭￭￭￭￭￭ 9
2Connect the tubings to the tubing olives of the pump tubing using
union nuts.
Figure 3 Connecting the tubings
NOTICE
To fasten PTFE tubings in place, you have to widen their openings
(e.g. using a Phillips screwdriver). You can use a piece of sandpa-
per to make the PTFE tubing easier to handle.
3Screw the union nuts tightly to ensure a secure tubing connection.
Figure 4 Screwing the union nuts tightly

3.3 Connecting the membrane pump ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
10 ￭￭￭￭￭￭￭￭
3.3 Connecting the membrane pump
WARNING
Follow the instructions listed below for connecting to a control device.
The instrument can be damaged if operated with the wrong supply
voltage.
Voltage
The 823 Membrane Pump Unit needs 16 - 24 V DC voltage. It can be con-
nected directly to Sample Processor models 814, 815, 855 or 864.
When using the 823 Membrane Pump Unit in an automation system with
remote control, we recommend using a 731 Relay Box for the power sup-
ply.
3.3.1 Connection to a Sample Processor
￭Plug the M8 plug into the socket on the Sample Processor provided for
this purpose.
1 2
Figure 5 823 Membrane Pump Unit connected directly to the Sample
Processor
1Sample Processor 814, 815, 855, 864
Instruments with Pump Connector.
2823 Membrane Pump Unit
Membrane pump with M8 plug.

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ 3 Installation
￭￭￭￭￭￭￭￭ 11
NOTICE
The 823 Membrane Pump Unit is not suitable for use in conjunction
with the 824 Easy Sample Changer processor.
3.3.2 Connection to the 731 Relay Box
Connect the 823 Membrane Pump Unit with connection via the Remote
Box (6.2148.010) and the 731 Relay Box to a remote interface.
￭Connect the M8 plug of the 772 Pump Unit to the corresponding
socket on the adapter cable.
￭Plug the adapter cable into low-voltage DC current output DC1 or DC2
of the 731 Relay Box.
1 2 34 5 6
Figure 6 823 Membrane Pump Unit via the Remote Box and 731 Relay
Box
1Sample Processor 814, 815, 855, 864
Connection to remote interface.
2Remote Box (6.2148.010)
3Remote cable (6.2125.100) 4731 Relay Box (2.731.0010)
5Adapter cable (6.2160.010) 6823 Membrane Pump Unit

3.3 Connecting the membrane pump ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
12 ￭￭￭￭￭￭￭￭
NOTICE
Ensure the correct polarity of the banana plugs. The red plug (positive
pole) belongs in the red socket, the black plug (negative pole) belongs
in the black socket.
NOTICE
For information on controlling the 823 Membrane Pump Unit using the
731 Relay Box and a suitable control device, refer to the manual of the
731 Relay Box.