Jesco MAGDOS LC 2 Instruction Manual

MAGDOS LC
Operation &
Maintenance Instructions
Read these operation & maintenance instructions
before start up!
To be held for future reference.
A measured step forward
Dosing
C
onveying
Control
Liquids
Gases
Systems

36
Contents
1. Safety .................................................................................................................................................... 37
1.1 General .................................................................................................................................................. 3 7
1.2 Warnings used in this Operation & Maintenance Manual ................................................................37
1.3 Qualification and training of personnel ..............................................................................................38
1.4 Hazards due to non-compliance with safety instructions.................................................................38
1.5 Safe operation ......................................................................................................................................38
1.6 Safety instructions for the owner/operator........................................................................................ 3 8
1.7 Safety instructions for installation, inspection, and maintenance ....................................................38
1.8 Unauthorized modification and production of spare parts ..............................................................3 9
1.9 Impermissible modes of operation .................................................................................................... 39
1.10 Dosing of chemicals ............................................................................................................................ 39
1.11 Scope of delivery..................................................................................................................................41
2. General .................................................................................................................................................. 41
3. Description ........................................................................................................................................... 42
4. Dimensions........................................................................................................................................... 4 2
5. Technical data .......................................................................................................................................43
6. Performance curves ............................................................................................................................ 4 4
7. Installation ............................................................................................................................................45
7.1 General notes of instruction................................................................................................................45
7.2 Installation location .............................................................................................................................. 45
7.3 Electrical connection ............................................................................................................................ 46
7.4 Pressure sustaining and safety valves ...............................................................................................46
7.5 Injection nozzles ................................................................................................................................... 46
7.6 Installation examples............................................................................................................................47
8. Operation ..............................................................................................................................................48
8.1 Setting of flow rate ............................................................................................................................... 4 9
9. Start up ................................................................................................................................................. 49
10. Shutdown .............................................................................................................................................50
11. Maintenance .........................................................................................................................................5 1
11.1 Replacing the diaphragm ....................................................................................................................5 1
11.2 Inspecting and replacing the deflector plate ...................................................................................... 54
11.3 Check valves .........................................................................................................................................55
11.4 Drive solenoid ......................................................................................................................................57
11.5 Correction of stroke length adjustment ............................................................................................. 58
11.6 Diagram of the circuit board MAGDOS LC ........................................................................................ 59
12. Spare parts list MAGDOS LC 2 ... 6 .................................................................................................... 60
13. Troubleshooting...................................................................................................................................62
14. Declaration of conformity .................................................................................................................... 64
15. Declaration of harmlessness ...............................................................................................................65
16. Warranty ...............................................................................................................................................66
Dimensions for the USA ......................................................................................................................68
Technical data for the USA ..................................................................................................................6 9

37
1. Safety
1.1 General
This Operation & Maintenance Manual contains basic information to be noted during
installation, operation and maintenance. It is therefore essential that the Manual is read
by the contractor before installing and commissioning the pump/system as well as by
the relevant operating personnel / owner of the pump/system. It must remain accessible
at the dosing pump/system for reference at all times.
In addition to the general safety instructions under this main heading Safety, the special
safety precautions outlined in other sections must also be observed.
1.2 Warnings used in this Operation & Maintenance Manual
This Operation & Maintenance Manual contains vital information, which may endanger
people, the environment and the dosing pump/system if disregarded. These statements
are identified by the following symbols:
DANGER!
Refers to an imminent danger.
Non-compliance can lead to death or extremely serious injury.
WARNING!
Refers to a potentially hazardous situation. Non-compliance can lead to death or serious
injury.
CAUTION!
Refers to a potentially hazardous situation. Non-compliance can lead to minor injury or
property damage.
NOTICE!
Appears in conjunction with safety instructions, which may endanger the pump/system
and its operation if disregarded.
IMPORTANT!
Draws attention to supplementary information to make the work easier and ensure
trouble free operation.
Markings which are affixed directly to the pump, such as
•Cable markings
•Markings for process fluid connections
must be observed without fail and must remain fully legible at all times.

38
1.3 Qualification and training of personnel
The personnel employed for installation, operation, inspection and maintenance must
be qualified for this work. The areas of responsibility, competence and supervision of
the personnel must be precisely defined by the owner. Personnel who do not have the
required knowledge must be duly trained and instructed. If necessary, this training can
also be provided by the manufacturer/supplier on behalf of the dosing pump’s owner.
In addition, the owner of the system must ensure that the relevant personnel are fully
familiar with and have understood the contents of this Operation & Maintenance Manu-
al.
1.4 Hazards due to non-compliance with safety instructions
Failure to comply with the safety instructions may endanger not only people, but also
the environment and the dosing pump/system. Non-compliance with the safety
instructions can lead to the loss of all entitlement to damages.
The following hazards in particular may arise:
•Danger to people due to electrical, mechanical and chemical effects.
•Failure of dosing pump/system functions.
•Failure of specified methods for maintenance and repair.
•Danger to the environment due to leakage of hazardous substances.
1.5 Safe operation
The safety instructions contained in this Operation & Maintenance Manual must be
observed. The owner is responsible for ensuring compliance with local safety
regulations.
1.6 Safety instructions for the owner/operator
•Leakages (e.g. due to diaphragm rupture) of hazardous substances (e.g. toxic,
abrasive) must be discharged in such a way as to exclude all danger to people and
the environment. Statutory regulations must be observed.
•Danger due to electric current must be excluded (for further details, refer to the
German VDE standards as well as local rules and regulations).
1.7 Safety instructions for installation, inspection, and maintenance
The owner must ensure that all installation, inspection and maintenance work is
undertaken by authorized and duly qualified skilled personnel who have also studied
this Operation & Maintenance Manual.
The dosing pump must always come to a complete stop before starting any work on the
pump. The procedure specified in this Operation & Maintenance Manual for shutting
down the dosing pump/system must be observed without fail.
Dosing pumps or systems in contact with potentially harmful media must be
decontaminated.

39
All safety mechanisms and guards must be refitted and reactivated as soon as the work
is completed.
The instructions outlined in chapter 7.2 “Installation location” and 9. “Start up” must
be observed before starting the pump/system.
1.8 Unauthorized modification and production of spare parts
The dosing pump may only be modified or converted in consultation with the
manufacturer. Genuine spare parts and accessories authorized by the manufacturer
ensure greater safety. Liability for damage or loss may be voided if non Lutz-Jesco parts
are used.
1.9 Impermissible modes of operation
The operational safety of the pump supplied can only be guaranteed when it is used in
conformity with its intended use as specified in Lutz-Jesco contract documents especially
the order confirmation. The limit values specified in these documents must never be
exceeded.
1.10 Dosing of chemicals
CAUTION!
•When working on dosing systems, the accident prevention regulations applicable
on-site must be observed and the specified personal protective equipment worn.
The following standard protective clothing is recommended, depending on the
hazard associated with the metered medium:
Goggles Protective gloves Protective suit
•All people responsible for installation and maintenance of pumps, piping, hoses
and accessories should wear this protective equipment.
•Before working on the dosing pump and plant, disconnect it from the power supply
and protect it against reconnection:
CAUTION!
•Any chemical still present in the dosing head may spray out when the power supply
is reconnected. This may lead to caustic or other burns to the face and hands.
Dosing lines must always be connected before starting the pump again.
•The chemical resistance of the pump’s materials of construction used must be
verified before dosing aggressive media!
•The dosing head of the dosing pump as well as connections and lines of the system
may be under pressure. Working on the dosing system requires special safety
precautions and may only be carried out by instructed technical personnel:
CAUTION!
CAUTION!

40
CAUTION!
•Chemical could spray out. This may lead to caustic or other burns. Always relieve
the system/pump pressure before starting work on the dosing pump.
•Before working on the dosing head, check valves and connections, flush the pump’s
wetted end with a harmless medium (mainly water) to avoid unintentional contact
with the metered medium.
WARNING!
•Never look into the open end of a clogged line or valve.
Chemical may emerge unexpectedly and cause caustic or other burns to face and
hands.
•Before start up, all connections must be inspected for correct tightness and, if
necessary, must be further tightened using appropriate tools.
CAUTION!
•If connections at the dosing head are loosened during operation for venting or
other reasons, leaking chemical must be removed professionally. This is the only
way to avoid the danger of physical injury and corrosion at the dosing pump.
Leaking chemical may also damage the diaphragm at its mounting points.
NOTICE!
•When changing the chemical, check whether the pump’s and the system’s materials
of construction are chemically resistant. If there is the danger of a chemical reaction
between different media, a thorough cleaning first is mandatory.
IMPORTANT!
•After adjusting the stroke length, the locking screw must be retightened. Otherwise
the adjusting knob may change its position. Thus causing faulty flow rates.
DANGER!
•Fire hazard. Pressure surge: parts may be catapulted off and cause fatal injury.
MAGDOS LC must never be used in an explosion-proof area.
CAUTION!
• Hot metal parts may burn your hands. Always disconnect the mains power feeder
before opening the magnetic drive and let the dosing pump cool for at least one
hour.
CAUTION!
WARNING!
NOTICE!
IMPORTANT!
DANGER!
CAUTION!
CAUTION!

41
CAUTION!
Malfunctions may arise in
•Circuits
•Magnetic strips
•Mobile phones
if brought in direct vicinity of the stroking solenoid.
1.11 Scope of delivery
IMPORTANT!
Please unpack the dosing pump and ordered accessories carefully in order not to miss
small parts. Immediately compare the scope of delivery to the delivery note. If there are
any discrepancies, contact your local distributor.
2. General
Dosing pumps are used to add chemicals specifically in various processes.
Metering capacities range from 2.0 to 5.9 litres per hour ( 0.53 to 1.56 gph). The exact
metered capacities can be derived from the performance curves (chapter 6). All types
are available for testing in accordance with the German regulation DVGW-DIN 19635.
IMPORTANT!
CAUTION!

42
O 77 70
q
O 6
100
90
84 q
210~
100
120
L
140~
3. Description
Legend:
1 Solenoid coil
2 Solenoid armature
3 Stroke adjustment
4 Electronic unit
5 Drain pipe
6 Suction valve
7 Dosing head
8 Discharge valve
9 Diaphragm
10 Diaphragm return
spring
The solenoid coil of the drive solenoid is activated in a pulsating manner by the
electronic unit in the MAGDOS LC dosing pump. The solenoid armature forces
the diaphragm to the left and displaces the liquid in the dosing head . The liquid
escapes through the discharge valve into the discharge line. When the solenoid
armature is de-energized, the diaphragm return spring 햻moves the solenoid armature
and diaphragm back to its original position. A negative pressure is produced in
the dosing head and liquid is drawn in through the suction valve . Leakages due
to a diaphragm rupture are discharged in a controlled manner through the drain .
4. Dimensions




 

햻
All dimensions in mm. For dimensions
in inches refer to page 68.
Nominal Tubing Dim. L
witdth connection
DN 4 4/6 - 4/6 126 mm
DN 6 6/9 - 6/9 134 mm
DN 4 / DN 6 4/6 - 6/9 130 mm

43
* The exact metered capacities can be derived from the performance curves.
Technical data for the USA refer to page 69.
5. Technical data
MAGDOS LC 2 4 6
Max. pressure* [bar] 10 8 5
Flow rate at max. pressure* [l/h] 2.0 3.9 5.7
Medium pressure* [bar] 6 4 3
Flow rate at medium pressure* [l/h] 2.2 4.1 5.9
Max. stroke frequency [1/min] 120
Suction lift [mH2O] for non-effervescent media 3
Max. supply pressure [mbar] 800
Power supply 115 V AC or 230 V AC +/- 10%
50/60 Hz
Power supply cable 2m (230 V AC with shock-proof plug,
115 V AC with-/ UL- CSA-plug)
Power consumption 20 W
Max. Power consumption during dosing stroke 230 V AC: 2.0 A; 115 V AC: 3.8 A
Soldered fuse 230 V AC and 115 V AC: 3.15 A slow
Protection class IP 65
Insulation class F
Max. ambient temperature 45° C (with PVC parts 40° C)
Max. process fluid temperature 40° C (with PVC parts 35° C)

44
The performance curves refer to water at 20 °C (68 °F). The performance of the dosing pump depends on
the viscosity of the process fluid and hydraulic installation conditions. Dosing pumps must therefore be
gauged in litres during application.
MAGDOS LC 2
MAGDOS LC 4
MAGDOS LC 6
6. Performance curves
0
1
2
3
4
5
6
7
8
9
10
0,0 0,5 1,0 1,5 2,0 2,5
Capacity [l/h]
Stroke length
2 bar
6 bar
10 bar
145 psig
87 psig
29 psig
0
1
2
3
4
5
6
7
8
9
10
0,00,51,01,52,02,53,03,54,04,5
Capacity [l/h]
Stroke length
2 bar
4 bar
8 bar
29 psig
58 psig
116 psig
0
1
2
3
4
5
6
7
8
9
10
0,01,02,03,04,05,06,0
Capa city [l/h]
Stroke length
2 bar
3 bar
5 bar
43,5 psig
72,5 psig
29 psig

45
7. Installation
7.1 General notes of instruction
For the selection of a dosing pump when designing a system as well as for the installation
and operation, local rules and regulations must be obeyed. This applies to the selection
of appropriate materials of construction, the handling of the chemicals and the electrical
installation. At the same time the technical data of the dosing pump (chapter 5.) must
be taken into consideration. The system must be designed accordingly/properly (e.g.
pressure loss in lines depending on nominal diameter and length).
The designer and the user are responsible to make sure that the whole system including
the dosing pump is constructed so that neither plant equipment nor buildings are
damaged in the case of chemical leakage due to the failure of wear parts (e.g. diaphragm
rupture) or burst tubing. If the chemical plant represents a potential danger, the installation
must be carried out in a way that no unreasonably high consequential damages occur,
even if the dosing pump fails. Therefore we recommend the installation of leakage
probes and containment tanks.
The drain pipe of the dosing head must be visible in order for a diaphragm failure to be
detected. Drainage must be routed with a downward slope to the collecting tank.
To increase the dosing accuracy and to ensure the functional reliability, we recommend
the use of additional accessories! These include back pressure valves, relief valves,
leakage probes and low level indicators, as shown in the installation examples. Always
use appropriate tools for the installation of plastic connecting parts.
To avoid damage, never apply excessive force.
IMPORTANT!
Plastic parts (especially PVC parts) can be tightened and loosened more easily if the
thread is lubricated with slip additive (e.g. silicone grease).
Threaded stainless steel parts (i.e. dosing head and check valves) have to be lubricated
before assembled (i.e. PTFE-spray). This will make the disassembly easier when
performing maintenance on the pump.
NOTICE!
The slip additive must be compatible with the chemical to be metered.
7.2 Installation location
The installation location of the dosing pump must be easily accessible for the operating
and service staff.
The operation sound of the dosing pump might be transmitted to the piping and thus
result in a disturbing noise level. In this case, it is recommended to mount the dosing
pump on a wall bracket which, for the same reason, should be fixed to outer walls
instead of interior walls adjacent to occupied rooms. When installing the dosing pump
below the storage level of the process fluid, care must be taken to ensure that chemical
leakages due to a broken diaphragm cannot cause any damage (collecting pan, leakage
sensor).
It is also possible to mount the pump directly on the chemical supply tank.
Please note the ambient temperature of the dosing pump (refer to technical data table).
Radiant heat of apparatus and heat exchangers must be shielded so that the dosing
pump can still dissipate its own heat sufficiently. Exposure to direct sunlight must be
NOTICE!
IMPORTANT!

46
avoided. If the dosing pump is installed outside, provide a roof to protect it against
weather.
7.3 Electrical connection
DANGER!
• Fire hazard. Pressure surge: parts may burst and cause fatal injury.
Magdos LC must never be used in an explosion-proof area.
The electrical connection of the dosing pump must be made according to the local rules
and regulations and may only be carried out by technical personnel. The 230 VAC
version of the MAGDOS LC is connected via a grounded appliance plug connector. The
115 VAC version is equipped with a UL/CSA plug connector.
7.4 Pressure sustaining and safety valves
Pressure sustaining valves are accessories for optimizing the dosing process. They are
used
•to increase the dosing accuracy in the presence of fluctuating back pressure.
•with long dosing lines in order to prevent excess delivery, as the accelerated
medium continues moving on account of its own inertia even when the delivery
stroke has already ended.
•to prevent siphoning through the dosing pump if the suction pressure is higher
than the system pressure.
Safety and overflow valves protect the dosing pump and the associated accessories and
lines from overloads. Those prevent the system pressure from rising to an impermissible
high level on the discharge side of the dosing pump, what may be caused by the
accidential closing of valves while pump in operation or a clogged injector.
7.5 Injection nozzles
Injection nozzles are used to mix the metered process fluid into a main stream and
simultaneously fullfil a non-return function. The injection nozzle is usually installed in
the main line from above. Installation from below is only recommended in the case of
media with a tendency to crystallize. Thus entrapped air is able to leave.
In the case of media with a tendency to contaminate the injector, it is advisable to use an
injector which can be dismantled for maintenance and shut off.
DANGER!

47
Injection fitting
mounted from above
Injection fitting mounted from below
(for media with a tendency to
crystallize)
7.6 Installation examples
Legend
1 MAGDOS LC
2 Chemical tank
3 Suction line
4 Wall bracket
5 Mounting Hardware Magdos
Pump Riser Base (p/n 37558)
on wall bracket



Mounting of Magdos LC to Wall Bracket, Tank Mounting Plate, and Pump Riser
Base
Legend
1 Bolt M5
2 Rod M5
Mounting Hardware consisting of
4 x Bolt
4 x Rod
(p/n 37558)


on chemical tank



48
Legend
1 MAGDOS LC
2 Chemical tank
3 Suction line
4 Priming aid
5 Electric agitator
6 Pulsation dampener
7 Injection nozzle with non-return
and shutoff valve
8 Back pressure regulating valve
9 Pressure relief valve
(safety valve)
8. Operation
Control panel MAGDOS LC
Legend
1 Stroke adjustment with
scale and locking screw
2 Mains cable
Installation example










49
8.1 Setting of flow rate
Volumetric displacement per dosing stroke
The stroke length adjustment limits the movement of the diaphragm. Adjusting the
stroke length does not have a linear proportional effect on the stroke volume. The
volume per dosing stroke is shown in the performance curves or displayed on the
dosing pump’s calibration table.
For adjustment, loosen the locking screw, adjust to the desired setting and retighten
the locking screw.
NOTICE!
Adjust stroke length only, while pump is in operation.
NOTICE!
9. Start up
NOTICE!
Personal protective equipment as specified by on-site safety regulations must be worn
at all times while working on the dosing pump!
Goggles Protective gloves Protective clothing
1. At the initial startup switch on power and let pump prime. For this purpose, it is
advisable to set the stroke to “10”. If the dosing pump does not prime drawing from
the supply tank, the dosing head must be filled with process liquid (through the top
of the head after removing the discharge check valve) while the pump is switched
off. If the medium is not hazardous, it can be used directly; otherwise use a neutral
medium that will not disturb the process (water can be used in many cases).
WARNING!
Chemical could spray out. This may lead to caustic or other burns. Ensure that the
line is not under pressure before disconnecting it.
Mount discharge valve, switch on the dosing pump and allow it to prime again
(priming aid is recommended, refer to installation examples).
2. If a venting facility is integrated in the dosing head or is available as separate unit,
open it while the dosing pump is operating until liquid escapes. Then close it. In
the case of effervescent media allow the process fluid to flow continuously (approx.
1 drop per 1...3 strokes).
The escaping chemical must be returned to the storage vessel with the aid of a hose
connector.
3. When desired operation is achieved, set flow rate and lock adjusting knob. For a
first approximation refer to the calibration table attached to the dosing pump. Such
a calibration table indicates the stroke length setting for a selected flow rate per
stroke (ml/pulse) as a function of the system pressure. Intermediate values must be
calculated.
WARNING!
CAUTION!

50
Example:
Required capacity: 1.50 l/h (0.40 gph) @ 6bar (87psig). Calibration table shows a
stroke length of 7.2. The pump’s stroke length adjustment has to be set to 7.2, while
the pump is operating.
NOTICE!
Depending on the installation, the chemicals used and the media temperature,
these values may differ and must be verified under operating conditions.
4. The manufacturer of the dosing equipment is not responsible for damages due to
excessive or low flow rates resulting from faulty dosing pump settings or insufficient
and incorrect installation of peripheral accessories and fittings.
10. Shutdown
Before starting any maintenance and before prolonged downtime, drain the chemical
from the dosing pump and rinse it with a neutral medium.
CAUTION!
Excess chemical must be disposed of in accordance with local rules and regulations.
Note the applicable accident prevention regulations and wear personal protective
equipment.
Goggles Protective gloves Protective clothing
CAUTION!
The dosing pump must be disconnected from the power supply and secured to prevent
unauthorized restarting.
CAUTION!
The pressure must be relieved before disconnecting the discharge line from the pump
discharge valve so that chemical will not spray out.
It is advisable to loosen the discharge and suction check valves in order to drain the
dosing head.
CAUTION!
NOTICE!
CAUTION!
CAUTION!
1,00 1,25 1,50 1,75 2,00 2,25
bar psig 0,26 0,33 0,40 0,46 0,53 0,59
2 29 4,1 5,2 6,3 7,3 8,3 9,4
6 87 5,0 6,1 7,2 8,2 9,2 -
10 145 5,2 6,5 7,7 8,8 10,0 -
Hub
länge
stroke
length
LC 2 l/h
gph

51







11. Maintenance
Dosing pumps are produced according to the highest quality standards and have a long
service life. Nevertheless some parts are subject to wear caused by operation (e.g.
diaphragm, valve seats, valve balls). To ensure a long operating life, visual inspection
is recommended regularly. Periodic maintenance protects dosing pump and system
from unexpected downtime.
NOTICE!
The dosing pump may have to be re-adjusted after changing the diaphragm or replacing
other parts (chapter 11.5 correcting the stroke length adjustment).
11.1 Replacing the diaphragm
CAUTION!
Chemical could spray out. This may lead to caustic or other burns. The dosing pump
head must always be depressurized and rinsed with water or a suitable medium before
starting any work on the dosing pump.
1 Dosing head
with discharge and suction valve
2 Diaphragm
3 Support plate
4 Diaphragm insert
5 Deflector plate
6 Diaphragm rod
7 Drain pipe
8 Locking pin (Part No. 29379)
9 Drive unit housing
NOTICE!
CAUTION!

52
Replacing the diaphragm
1. Remove the dosing head with
a suitable tool (size 3 Allen key).
Figure 1
2. With the dosing pump
operating, adjust stroke length
setting to 0% and then turn pump
off. Insert the locking pin (Art.
No. 29379) through the drainage
pipe into the drilled hole in the
diaphragm rod .
If the diaphragm rod has twisted
so that the drilled hole cannot be
reached, grab the outer edge of the
diaphragm and turn it clockwise
until the drilled hole can be seen
through the drain pipe. The
diaphragm rod can then be secured
with the locking pin.
Figure 2
3. Switch off the pump.
4. Grab the edge of the diaphragm
and turn it counterclockwise.
The support plate behind the
diaphragm is removed at the same
time.
Figure 3
IMPORTANT!
The diaphragm insert and the
support plate must be cleaned
before installing a new diaphragm.
Otherwise the diaphragm may be
attacked from the rear that is still
contaminated.
NOTICE!
Inspect that the deflector plate 
is in perfect condition, „Check and
replacing the deflector“ (Chapter
11.2).
NOTICE!
IMPORTANT!
1
2
3

53
5. Grease the diaphragm rod with
Molykote DX at the contact point with
the housing bushing and along the
diaphragm thread.
6. Push the support plate onto
the threaded connector of the new
diaphragm with the concave side
facing towards the diaphragm.
Figure 4
7. Turn the new diaphragm 
clockwise into the diaphragm rod
together with the support plate was-
her until it locks tightly to the
stroking rod. The smooth side of the
support is pressed against the end
of the diaphragm rod. Figure 5
8. Now remove the locking pin .
Figure 5 .
Start pump to adjust stroke length
adjustment to 0%. Turn pump off to
install dosing head.
9. Install the dosing head . Tighten
the screws alternately, e.g. top left –
bottom right – top right – bottom
left. A tightening torque of 125 Ncm
is required for the dosing head
screws. Figure 6
IMPORTANT!
The diaphragm will not provide a
tight seal if the tightening torque is
too low. The dosing head may be
damaged if the tightening torque is
too high.
10. After reconnecting the suction
and discharge line, the dosing pump
is started as described in the section
start up (Chapter 9).
If the diaphragm is frequently worn
down and requires frequent
replacement,(Chapter13)
„Troubleshooting“ for a description
of possible causes.
IMPORTANT!
4
5
6

54
CAUTION!
11.2 Inspecting and replacing the deflector plate
CAUTION!
Chemical could spray out. This may lead to caustic or other burns. The dosing head
must always be depressurized and rinsed with water or a suitable medium before
starting any work on the dosing pump.
The following steps are required
to verify that the deflector plate
is in perfect condition and to
replace it if necessary. Repeat
steps 1-4 of Chapter 11.1
„Replacing the diaphragm“.
The deflector plate can be
reached after removing the
diaphragm insert . The
diaphragm insert can be
removed without difficulty by
prying it out with two
screwdrivers inserted in the
countersinks of the outer flanges.
Figure 1
Examine the condition of the
diaphragm.
The deflector plate must be
replaced if it is damaged.
Remove the old deflector plate.
Slide the new deflector plate 
onto the diaphragm rod until it
engages in the groove of the
diaphragm rod . Figure 2
Now press the diaphragm insert
into the flange and proceed
through steps 5-10 in Chapter
11.1 „Replacing the diaphragm“.
Figure 3
1
2
3