DMI 208
Dosing pump
GRUNDFOS ALLDOS INSTRUCTIONS
Installation and operating instructions
Declaration of Conformity
We Grundfos Alldos declare under our sole responsibility that the products
DMI 208, to which this declaration relates, are in conformity with the Council
Directives on the approximation of the laws of the EC Member States relating to
– Machinery (98/37/EC).
Standard used: EN ISO 12100.
– Electromagnetic compatibility (89/336/EEC).
Standards used: EN 61000-3-2: 1995, + A1 + A2, EN 61000-3-3: 1995 and
EN 61326: 1997, + A1 + A2, Class B.
– Electrical equipment designed for use within certain voltage limits
(73/23/EEC) [95].
Standard used: EN 61010-1: 2002.
Pfinztal, 7th December 2007
W. Schwald
Managing Director
Ulrich Stemick
Technical Director
2
3
CONTENTS
Page
1. General information 3
1.1 Introduction 3
1.2 Service documentation 3
1.3 Information about the product 3
1.4 Applications 8
1.5 Warranty 8
2. Safety 8
2.1 Identification of safety instructions in this
manual 8
2.2 Marking at the pump 8
2.3 Qualification and training of personnel 9
2.4 Risks when safety instructions are not
observed 9
2.5 Safety-conscious working 9
2.6 Safety instructions for the operator/user 9
2.7 Safety instructions for maintenance,
inspection and installation work 9
2.8 Unauthorised modification and manufacture
of spare parts 9
2.9 Improper operating methods 9
2.10 Safety of the system in the event of
a failure in the dosing system 9
3. Transport and intermediate storage 10
3.1 Transport 10
3.2 Delivery 10
3.3 Unpacking 10
3.4 Intermediate storage 10
3.5 Return 10
4. Technical data 10
4.1 Identification 10
4.2 Type key 11
4.3 General description 12
4.4 Dimensional sketches 15
4.5 Versions 17
4.6 Materials 17
4.7 Control data (with control unit) 18
5. Installation 18
5.1 Installation location 18
5.2 Mounting 18
5.3 General information on installation 19
5.4 Dosing controller 22
5.5 Tube / pipe lines 22
6. Electrical connections 24
6.1 Connecting the signal lines for DMI 25
6.2 Connecting the power supply cable 27
7. Start-up / shutdown 27
7.1 Initial start-up / subsequent start-up 27
7.2 Operating the pump 30
7.3 Shutdown 30
8. Operation 31
8.1 Control and display elements 31
8.2 Switching on/off 32
8.3 Operating the pump with control unit 32
8.4 Adjusting and locking the stroke length 33
8.5 Notes for stroke-length adjustment 33
8.6 Adjusting the zero point 34
8.7 Calibrating the dosing flow with Plus
3
system 34
8.8 Pumps with manual deaeration 34
8.9 Changing the tank with Plus
3
system 35
9. Maintenance 35
9.1 General notes 35
9.2 Maintenance intervals 35
9.3 Cleaning suction and discharge valves 35
9.4 Replacing the diaphragm 37
10. Fault finding chart 38
11. Dosing curves 40
12. Disposal 43
1. General information
1.1 Introduction
These installation and operating instructions contain
all the information required for starting up and
handling the DMI 208 diaphragm dosing pump.
If you require further information or if any problems
arise, which are not described in detail in this
manual, please contact the nearest Grundfos Alldos
company.
1.2 Service documentation
If you have any questions, please contact the
nearest Grundfos Alldos company or service
workshop.
1.3 Information about the product
1.3.1 Pump types
The DMI 208 dosing pump is available for a variety
of performance ranges in various sizes:
Warning
These complete installation and
operating instructions are also
available on www.Grundfosalldos.com.
Prior to installation, read these
installation and operating instructions.
Installation and operation must comply
with local regulations and accepted
codes of good practice.
Pump types
DMI 0.3-10
DMI 0.8-16
DMI 1.0-10
DMI 1.1-16
DMI 1.6-10
DMI 3.0-10
DMI 3.6-16
DMI 4.0-8
DMI 5.0-6
DMI 6.0-8
DMI 9.0-6
DMI 14-4
DMI 18-3.5
4
The following is indicated on the pump nameplate:
• The pump type which specifies the stroke volume,
connection size and performance data (see
below).
• The pump serial number which is used to identify
the pump.
• The most important characteristics of the pump
configuration, e.g. dosing head and valve
materials. They are described in section
4. Technical data.
• Maximum flow rate and maximum counter
pressure.
• Supply voltage or mains voltage and mains
frequency.
1.3.2 Connection size
Note
The pump for viscous liquids is called
HV variant in the following.
Pump type Connection size HV variant
DMI 0.3-10 DN 4 DN 4
DMI 0.8-16
Suction side DN 4
Discharge side DN 8
DN 8
DMI 1.0-10 DN 4 DN 8
DMI 1.1-16
Suction side DN 4
Discharge side DN 8
DN 8
DMI 1.6-10 DN 4 DN 8
DMI 3.0-10 DN 4 DN 8
DMI 3.6-16
Suction side DN 4
Discharge side DN 8
DN 8
DMI 4.0-8 DN 4 DN 8
DMI 5.0-6 DN 4 DN 8
DMI 6.0-8 DN 4 DN 8
DMI 9.0-6 DN 8 DN 8
DMI 14-4 DN 8 DN 8
DMI 18-3.5 DN 8 DN 8
5
1.3.3 Pump performance
Performance data at maximum pump counter pressure
Applies to:
• water as dosing medium
• suction lift of 0.5 m
• fully deaerated dosing head
• maximum stroke length.
* p max. applies to dosing heads without automatic deaeration; with automatic deaeration: 1 bar less.
Observe the maximum permissible temperatures and that the friction loss increases with the viscosity of
the dosing medium.
** The maximum dosing flow of pumps with automatic deaeration or Plus
3
system is approx. 0.1 to 0.4 l/h
lower, depending on pump type.
The maximum dosing flow of HV-variant pumps is up to 10 % lower.
Pump type
50 Hz 60 Hz
Stroke
volume
V
Q**
p
max.*
Max.
stroke
rate
Q**
p
max.**
Max.
stroke
rate
[cm
3
] [l/h] [bar] [n/min] [l/h] [US gph] [bar] [psi] [n/min]
DMI 0.3-10 0.04 0.3 10 120 0.36 0.095 10 145 144
DMI 0.8-16 0.11 0.8 16 120 0.96 0.254 16 232 144
DMI 1.0-10 0.14 1.0 10 120 1.20 0.317 10 145 144
DMI 1.1-16 0.15 1.1 16 120 1.32 0.349 16 232 144
DMI 1.6-10 0.22 1.6 10 120 1.92 0.507 10 145 144
DMI 3.0-10 0.42 3.0 10 120 3.50 0.925 7 102 144
DMI 3.6-16 0.50 3.6 16 120 4.32 1.14 13 189 144
DMI 4.0-8 0.55 4.0 8 120 4.8 1.27 8 116 144
DMI 5.0-6 0.69 5.0 6 120 6 1.58 5 72.5 144
DMI 6.0-8 0.84 6.0 8 120 7.2 1.902 6 87 144
DMI 9.0-6 1.24 9.0 6 120 10.8 2.853 5.5 80 144
DMI 14-4 1.92 14.0 4 120 16.8 4.439 3 44 144
DMI 18-3.5 2.5 18.0 3.5 120 21.6 5.7 3 44 144
Note
The pump can be operated in the range
between 1 % and 100 % of the maximum
dosing capacity.
6
1.3.4 Accuracy
• Dosing flow fluctuation: ± 1.5 % within the control
range 1:10
• Linearity deviation*: ± 4 % of the full-scale value.
Adjustment from max. to min. stroke length, within
the control range 1:5
• Applies to:
– water as dosing medium
– fully deaerated dosing head
– standard pump version.
• Construction tolerance: according to
VDMA 24284.
* Higher linearity deviation for pumps with automatic
deaeration or Plus
3
system.
1.3.5 Inlet pressure and counter pressure /
suction lift during operation
Maximum inlet pressure
Minimum counter pressure at the pump
discharge valve
Maximum suction lift* (start-up) for media with a
viscosity similar to water
* Deaeration valve open.
** Pumps with Plus
3
system are delivered with a
special start-up device.
Maximum suction lift* (continuous operation) for
media with a viscosity similar to water
* Dosing head and valves moistened.
1.3.6 Sound pressure level
45 dB(A), testing according to DIN 45635-01-KL3.
1.3.7 Enclosure class
• DMI 208 Inside: IP 20.
• Pump with mains plug: IP 65.
• Pump without mains plug: IP 65 can only be
ensured if the power supply cable is connected
with IP 65 protection.
Pump type
Pump version
Standard
With
automatic
deaeration
With
Plus
3
system
[bar] [bar] [bar]
DMI 0.3-10 DMI 18-3.5
0.2
No flooded suction, no
positive inlet pressure!
Pump type
Pump version
Standard
With
automatic
deaeration
With
Plus
3
system
[bar] [bar] [bar]
DMI 0.3-10 DMI 18-3.5
111
Pump type
Pump version
Standard
With
automatic
deaeration
With
Plus3
system
[m] [m] [m]
DMI 0.3-10
Flooded
suction
—
**
DMI 0.8-16 1.0 —
DMI 1.0-10 1.0
1.0 **
DMI 1.1-16 1.0
DMI 1.6-10 1.5
DMI 3.0-10 2.0
DMI 3.6-16 2.0
DMI 4.0-8 2.2
DMI 5.0-6 2.5 1.0 —
DMI 6.0-8 2.8 1.0 **
DMI 9.0-6
2.8 1.0 —DMI 14-4
DMI 18-3.5
Pump type
Pump version
Standard
With
automatic
deaeration
With
Plus
3
system
[m] [m] [m]
DMI 0.3-10
Flooded
suction
—1.5
DMI 0.8-16 DMI 18-3.5
61.51.5
7
• Pumps with electronics: The enclosure class is
only met if the sockets are protected! The data
regarding the enclosure class applies to pumps
with correctly inserted plugs or screwed-on caps.
1.3.8 Required energy
Power supply for AC voltage
• Rated voltage: 110 / 115 V or 230 / 240 V.
Deviation from the rated value: ± 10 %.
• Supply voltage: 24 V.
Deviation from the rated value: ± 15 %.
• Mains frequency: 50/60 Hz.
• Maximum input power: 22 W (reduced input
power according to pump type and connected
sensors).
EMC protection
Tested according to DIN EN 50082-2,
DIN V ENV 50140, DIN EN 50141,
DIN V ENV 50204, DIN EN 55022 class B,
DIN EN 61000-4-2, DIN EN 61000-4-5.
Mains impedan ce
Electromagnetic compatibility (EMC) according to
the 89/336/EEC directive:
• EN 61000-3-2: 2000 (limit values for harmonic
currents (device input current) ≤16 A per
conductor).
• EN 61000-3-3: 2002 (limitation of voltage
fluctuations and flickers in public low-voltage
distribution networks for devices with a rated
current ≤16 A per conductor, which do not require
a special connection).
• EN 61000-6-2: 2001 (generic standard for
immunity to interference for the industrial sector).
• EN 61000-6-4: 2001 (generic standard for emitted
interference for the industrial sector).
1.3.9 Ambient and operating conditions
• Permissible ambient temperature: 0 °C to +40 °C.
• Permissible storage temperature: –10 °C to
+50 °C.
• Permissible air humidity: max. relative humidity:
92 % (non-condensing).
1.3.10 Dosing medium
The dosing medium must have the following basic
characteristics:
• liquid
• non-abrasive
• non-inflammable.
For degassing dosing media, note the following:
• The DMI 208 with automatic deaeration can be
used for degassing, non-crystallising media such
as H
2O2
. Do not use this pump for chlorine
bleaching agents!
• The DMI 208 with Plus
3
system can be used for
moderately degassing media such as chlorine
bleaching agents. Do not use this pump for H
2O2
!
Maximum permissible viscosity at operating
temperature*
* The stated values are approximate values and
apply to Newtonian liquids.
Note that the viscosity increases with decreasing
temperature!
Caution
The power supply must be electrically
isolated from the signal inputs and
outputs.
Warning
The DMI 208 is NOT approved for
operation in potentially explosive
areas!
Caution
The installation site must be under
cover!
Ensure that the enclosure class of
motor and pump is not affected by the
atmospheric conditions.
Pumps with electronics are only
suitable for indoor use! Do not install
outdoors!
Caution
In the event of questions regarding the
material resistance and suitability of
the pump for specific dosing media,
please contact Grundfos Alldos.
Pump type
Pump version
Standard
With automatic
deaeration
With Plus
3
system
HV variant
[mPa s] [mPa s] [mPa s] [mPa s]
DMI 0.3-10 200 — 100 500
DMI 0.8-16 200 — 100 500
DMI 1.0-10 200 50 100 500
DMI 1.1-16 200 50 100 500
DMI 1.6-10 200 50 100 500
DMI 3.0-10 200 50 100 500
DMI 3.6-16 200 50 100 500
DMI 4.0-8 200 50 100 500
DMI 5.0-6 100 50 — 500
DMI 6.0-8 100 50 50 500
DMI 9.0-6 150 50 — 200
DMI 14-4 150 50 — 200
DMI 18-3.5 150 50 — 200
8
Permissible media temperature
1.4 Applications
1.4.1 Appropriate, acceptable and correct usage
The DMI 208 pump is suitable for liquid, nonabrasive and non-inflammable media strictly in
accordance with the instructions in this manual.
1.5 Warranty
Warranty in accordance with our general terms of
sale and delivery is only valid,
• if the pump is used in accordance with the
information within this manual.
• if the pump is not dismantled or incorrectly
handled.
• if repairs are carried out by authorised and
qualified personnel.
• if original spare parts are used for repairs.
2. Safety
This manual contains general instructions that must
be observed during installation, operation and
maintenance of the pump. This manual must
therefore be read by the installation engineer and the
relevant qualified personnel/operators prior to
installation and start-up, and must be available at the
installation location of the pump at all times.
It is not only the general safety instructions given in
this "Safety" section that must be observed, but also
all the specific safety instructions given in other
sections.
2.1 Identification of safety instructions in
this manual
If the safety instructions or other advice in this
manual are not observed, it may result in personal
injury or malfunction and damage to the pump. The
safety instructions and other advice are identified by
the following symbols:
Information provided directly on the pump, e.g.
labelling of fluid connections, must be observed and
must be maintained in a readable condition at all
times.
2.2 Marking at the pump
The pumps with Plus3 system are provided with the
following danger notice:
Dosing
head
material
Min.
media
tempera-
ture
Max.
media
tempera-
ture
p < 10 bar
Max.
media
tempera-
ture
p < 16 bar
[°C] [°C] [°C]
PVC 0 40 20
Stainless
steel,
DIN
1.4571*
–10 70 70
PP 0 40 20
PVDF** –10 60* 20
* A temperature of 120 °C at a counter pressure
of max. 2 bar is permitted for a short period
(15 minutes).
** At 70 °C, the maximum counter pressure is
3bar.
Warning
Observe the chemical manufacturer's
safety instructions when handling
chemicals!
Caution
The dosing medium must be in liqu id
form!
Observe the freezing and boiling points
of the dosing medium !
Caution
The resistance of the parts that come
into contact with the media depends on
the media, media temperature and
operating pressure. Ensure that parts
in contact with the media are
chemically resistant to the dosing
medium under operating conditions!
Make sure that the pump is suitable for
the actual dosing medium!
Warning
Other applications or the operation of
pumps in ambient and operating
conditions, which are not approved, are
considered improper and are not
permitted. Grundfos Alldos accepts no
liability for any damage resulting from
incorrect use.
Warning
If these safety instructions are not
observed, it may result in personal
injury!
Caution
If these safety instructions are not
observed, it may result in malfunction
or damage to the equipment!
Note
Notes or instructions that make the job
easier and ensure safe operation.
Beware of caustic liquids!
Risk of causticisation by the dosing
medium!
If the pump is filled, keep the cover
closed and do not touch inside the
priming chamber!
Before dismantling and transporting
the pump, empty the priming chamber
completely and clean it, if necessary!
9
2.3 Qualification and training of personnel
The personnel responsible for the operation,
maintenance, inspection and installation must be
appropriately qualified for these tasks. Areas of
responsibility, levels of authority and the supervision
of the personnel must be precisely defined by the
operator.
If the personnel do not have the necessary
knowledge, the necessary training and instruction
must be given. If necessary, training can be
performed by the manufacturer/supplier at the
request of the operator of the pump. It is the
responsibility of the operator to make sure that the
contents of this manual are understood by the
personnel.
2.4 Risks when safety instructions are not
observed
Non-observance of the safety instructions may have
dangerous consequences for the personnel, the
environment and the pump. If the safety instructions
are not observed, all rights to claims for damages
may be lost.
Non-observance of the safety instructions may lead
to the following hazards:
• failure of important functions of the pump/system
• failure of specified methods for maintenance
• harm to humans from exposure to electrical,
mechanical and chemical influences
• damage to the environment from leakage of
harmful substances.
2.5 Safety-conscious working
The safety instructions in this manual, applicable
national health and safety regulations and any
operator internal working, operating and safety
regulations must be observed.
2.6 Safety instructions for the operator/
user
Hazardous hot or cold parts on the pump must be
protected to prevent accidental contact.
Leakages of dangerous substances (e.g. hot, toxic)
must be disposed of in a way that is not harmful to
the personnel or the environment. Legal regulations
must be observed.
Damage caused by electrical energy must be
prevented (for more details, see for example the
regulations of the VDE and the local electricity
supply company).
2.7 Safety instructions for maintenance,
inspection and installation work
The operator must ensure that all maintenance,
inspection and installation work is carried out by
authorised and qualified personnel, who have been
adequately trained by reading this manual.
All work on the pump should only be carried out
when the pump is stopped. The procedure described
in this manual for stopping the pump must be
observed.
Pumps or pump units which are used for media that
are harmful to health must be decontaminated.
All safety and protective equipment must be
immediately restarted or put into operation once
work is complete.
Observe the points described in the initial start-up
section prior to subsequent start-up.
2.8 Unauthorised modification and
manufacture of spare parts
Modification or changes to the pump are only
permitted following agreement with the
manufacturer. Original spare parts and accessories
authorised by the manufacturer are safe to use.
Using other parts can result in liability for any
resulting consequences.
2.9 Improper operating methods
The operational safety of the supplied pump is only
ensured if it is used in accordance with section
1. General information. The specified limit values
must under no circumstances be exceeded.
2.10 Safety of the system in the event of
a failure in the dosing system
DMI 208 dosing pumps are designed according to
the latest technologies and are carefully
manufactured and tested. However, a failure may
occur in the dosing system. Systems in which dosing
pumps are installed must be designed in such a way
that the safety of the entire system is still ensured
following a failure of the dosing pump. Provide the
relevant monitoring and control functions for this.
Warning
Electrical connections must only be
carried out by qualified person nel!
The pump housing must only be
opened by personnel authorised by
Grundfos Alldos!
10
3. Transport and intermediate storage
3.1 Transport
3.2 Delivery
The DMI 208 dosing pump is delivered in a
cardboard box. Place the pump in the packaging
during transport and intermediate storage.
3.3 Unpacking
Retain the packaging for future storage or return, or
dispose of the packaging in accordance with local
regulations.
3.4 Intermediate storage
• Permissible storage temperature:
–10 °C to +50 °C.
• Permissible air humidity: max. relative humidity:
92 % (non-condensing).
3.5 Return
Return the pump in its original packaging or
equivalent.
The pump must be thoroughly cleaned before it is
returned or stored. It is essential that there are no
traces of toxic or hazardous media remaining on the
pump.
Before returning the pump to Grundfos Alldos for
service, the safety declaration at the end of these
instructions must be filled in by authorised personnel
and attached to the pump in a visible position.
If Grundfos Alldos is requested to service the pump,
it must be ensured that the pump is free from
substances that can be injurious to health or toxic.
If the pump has been used for such substances, the
pump must be cleaned before it is returned.
If proper cleaning is not possible, all relevant
information about the chemical must be provided.
If the above is not fulfilled, Grundfos Alldos can
refuse to accept the pump for service. Costs of
returning the pump are paid by the customer.
The safety declaration can be found at the end of these
instructions.
4. Technical data
4.1 Identification
Fig. 1 DMI 208 nameplate
Caution
Do not throw or drop the pump.
Caution
Grundfos Alldos accepts no liability for
damage caused by incorrect
transportation or missing or unsuitable
packaging of the pump!
Caution
If a pump has been used for a medium
which is injurious to health or toxic, the
pump will be classified as
contaminated.
Caution
The replacement of the power supply
cable must be carried out by an
authorised Grundfos Alldos service
workshop.
TM03 8408 1407
Pos. Description
1 Type designation
2 Model
3 Maximum capacity [l/h]
4 Voltage [V]
5 Frequency [Hz]
6 Product number
7 Country of origin
8 Year and week code
9 Marks of approval, CE mark, etc.
10 Maximum pressure [bar]
11 Serial number
11
4.2 Type key
Example: DM I 1.6 - 10 A PVC /V /G -T -H 1 33 B
Type range Mains plug
DMI X No plug
Maximum flow [l/h] F EU (Schuko)
Maximum counter pressure [bar] B USA, Canada
Control variant
I
Australia, New Zealand,
Taiwan
B
Without external control
interface
E Switzerland
A
Internal frequency control,
external contact signal control
Connection, suction/discharge
B6 Pipe, 4/6 mm
AR
Internal frequency control,
external contact signal control,
alarm relay
3 Tube, 4/6 mm
A5 Tube, 5/8 mm
Dosing head variant 4 Tube, 6/9 mm
PP Polypropylene 6 Tube, 9/12 mm
PV PVDF (polyvinylidene fluoride) C4 Tube, 1/8" / 1/4"
PVC Polyvinyl chloride R Tube, 1/4" / 3/8"
SS Stainless steel, DIN 1.4401 S Tube, 3/8" / 1/2"
PP-P3 PP with Plus
3
A Threaded, Rp 1/4, female
PVC-P3 PVC with Plus
3
V Threaded, 1/4" NPT, female
Gasket material A9 Threaded, 1/2" NPT, male
E
EPDM
(ethylene propylene diene monomer)
B1
Tube 6/12 mm/
cementing d. 12 mm
V FKM B3 Welding d. 16 mm
TPTFE Valve type
Valve ball material 1 Standard
C Ceramics
2
Spring-loaded
0.05 bar suction opening
pressure; 0.05 bar discharge
opening pressure
GGlass
TPTFE
SS Stainless steel, DIN 1.4401
3
Spring-loaded
0.05 bar suction opening
pressure; 0.8 bar discharge
opening pressure
Control panel position
T Top-mounted
X No control panel
4
Spring-loaded, discharge
side only
0.8 bar opening pressure
Supply voltage
G 1 x 230 V, 50/60 Hz
H 1 x 120 V, 50/60 Hz
12
4.3 General description
The DMI 208 is a dosing pump with an overloadprotected synchronous motor (which does not blow
when blocked).
The DMI 208 is available in various versions, see
also section 1. General information.
In the general description, a distinction is made
between pumps with dosing heads with the following
features:
• manual deaeration (standard)
• valve for automatic deaeration
•Plus
3
system
• diaphragm leakage detection.
Option:
The pump can also be equipped with a dosing
controller.
The functions are described, but only apply to the
relevant pump version.
4.3.1 DMI 208 with manual deaeration (DMI 0.3-10 - DMI 18-3.5) and with valve for automatic deaeration
for non-crystallising, degassing media (H
2O2
) (only for DMI 1.0-10 - DMI 18 -3.5)
Fig. 2 DMI 208 with valve for automatic deaeration / with manual deaeration
TM03 6212 4506
3b
3a
V
I
2a
3b
3a
3d
2b
I
Automatic Manual
Pos. Components
3a Suction valve
3b Discharge valve
2a Dosing head with manual deaeration
2b Dosing head with automatic deaeration
I Connection for deaeration line
V Deaeration screw for manual deaeration
3d Valve for automatic deaeration
13
4.3.2 DMI 208 Plus
3
system with priming and calibration system for moderately degassing liquids
(chlorine bleaching agents) (only for DMI 0.3-10 to DMI 4.0-8 / DMI 6.0-8)
Fig. 3 DMI 208 Plus
3
system
4.3.3 Functional principle of the Plus
3
system
Plus
3
system in operation:
• The priming chamber (F) is filled with the dosing
medium via the suction valve (3a).
– The calibration tube (E) is filled from the
priming chamber.
– Unused dosing medium flows back into the tank
via the overflow line (H).
• The dosing medium flows from the calibration
tube (E) to the discharge valve (3b) via the small
dosing diaphragm.
Fig. 4 Functional principle of the Plus
3
system
TM03 6213 4506
D
V
2c
L
M
N
F
G
1e
I
J
H
D
V
E
D
3b
V
2c
3a
K
1e
A
L
100%
70
80
90
40
60
50
30
20
0
10
Mode
n:150
10
100 %
1:8
1:2
1:4
70
60
80
1:16
90
1:32
1:n
contact
manual
Menu
0
32:1
2:1
1:1
4:1
40
20
30
16:1
8:1
Pos. Components
3a Suction valve
3b Discharge valve
2c Dosing head Plus
3
system
I Connection for deaeration line
V Deaeration screw
A Suction line from tank
1e
Line from calibration tube (E) to dosing
head (2c)
D Isolating valve at calibration tube (E)
E Calibration tube
F Priming chamber
G Connection for overflow line (H)
H Overflow line to tank (PVC tube 8/11)
J Deaeration line to tank
K Discharge line
L Cover
M Adhesive label
N Deaeration hole
Note
The isolating valve (D) must be open
during operation!
TM03 6214 4506
14
4.3.4 DMI 208 with diaphragm leakage detection
Fig. 5 DMI 208 with diaphragm leakage detection
4.3.5 Functional principle of diaphragm leakage
detection
Pumps with diaphragm leakage detection have a
special dosing head flange for an optoelectronic
sensor. The pump is supplied with the diaphragm
leakage sensor already installed.
The optoelectronic sensor contains:
• infrared transmitter
• infrared receiver.
Fig. 6 Diaphragm leakage sensor
If the diaphragm leaks,
• the liquid enters the dosing head flange.
• the light refraction changes.
• the sensor emits a signal.
The control unit operates two contacts, which can be
used, for example, to trigger an alarm signal or to
switch off the pump.
4.3.6 Dosing controller (without Plus
3
system)
The dosing controller monitors the dosing process
and emits a pulse for each suction stroke.
Fig. 7 Dosing controller
4.3.7 HV variant for liquids which are more
viscous than water
All HV-variant pumps are equipped with springloaded valves, some have a larger nominal diameter
and adapters.
TM03 6215 4506
O
P
3b
3a
V
I
2d
Pos. Components
3a Suction valve
3b Discharge valve
2d
Dosing head with flange for diaphragm
leakage detection
I Connection for deaeration line
V Deaeration screw for manual deaeration
O Opto-sensor
P M12 plug for socket 1
TM03 6216 4506
TM03 6217 4506
Note
Note that the HV-variant pump has
other dimensions and that other
connection line dimensions might be
required!
Sensor
15
4.4 Dimensional sketches
Fig. 8 DMI 208
Dimensions for DMI 208
TM03 6218 4506
156
105
120
e
b
a
145
c
d
113
a
[mm]b[mm] c[mm] d[mm]
e
c HV
[mm]
d HV
[mm]
e HV
DMI 0.3-10 225 20.7 175.5 112 G 3/8 175.5 112 G 3/8
DMI 0.8-16 - DMI 6.0-8 225 20.7 175.5 112 G 3/8 207.5 176 G 5/8
DMI 9.0-6 - DMI 18-3.5 230 26.7 184.5 133 G 5/8 184.5 133 G 5/8
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