Jesco MIDIDOS E Series Instruction Manual

MIDIDOS E
Diaphragm Dosing Pump
Operation &
Maintenance Instructions
Read these operation and maintenance instructions
before start up!
To be held for future reference.
Dosing
Conveying
Control
Liquids
Gases
System
s
EN 02

2 | Operation Manual MIDIDOS E |
Content
1. Safety .................................................................................................................................... 3
1.1 General..........................................................................................................................3
1.2 Warning symbols used in this Operation & Maintenance Manual........................................3
1.3 Qualification and training of personnel .............................................................................4
1.4 Important safety instructions ...........................................................................................4
1.5 Hazards due to non-compliance with safety instructions.................................................... 4
1.6 Safe operation................................................................................................................5
1.7 Safety instructions for the owner/operator........................................................................5
1.8 Safety instructions for inspection-, maintenance-, and installation work .............................5
1.9 Unauthorized modifications and production of spare parts.................................................5
1.10 Impermissible modes of operation .................................................................................5
1.11 Dosing of chemicals .....................................................................................................6
1.12 Scope of delivery .......................................................................................................... 7
2. General .................................................................................................................................. 8
3. Function ................................................................................................................................ 9
4. Technical Data .................................................................................................................... 10
5. Mechanical Handling Capacity Performance Curves ........................................................ 11
6. Measurement Drawing ....................................................................................................... 12
7. Installation .......................................................................................................................... 13
7.1 General information ......................................................................................................13
7.2 Installation location.......................................................................................................13
7.3 Drainage discharge....................................................................................................... 14
7.4 Pressure sustaining and safety valves............................................................................14
7.5 Injection nozzles ...........................................................................................................15
7.6 Electrical connection.....................................................................................................15
7.7 Installation example......................................................................................................17
8. Stroke Length Setting......................................................................................................... 18
9. Start Up ............................................................................................................................... 19
10. Shutdown .......................................................................................................................... 20
11. Maintenance ..................................................................................................................... 21
11.1 Lubricants..................................................................................................................21
11.2 Maintenance of storage ..............................................................................................21
11.3 Replacing the diaphragm ............................................................................................22
11.4 Valves........................................................................................................................ 24
12. Spare parts list MIDIDOS E 24...72................................................................................... 28
12. Spare parts list MIDIDOS E 120........................................................................................ 30
13. Troubleshooting ................................................................................................................ 32
14. Declaration of conformity................................................................................................. 33
15. Declaration of harmlessness............................................................................................ 34
16. Warranty............................................................................................................................ 35

Safety | Operation Manual MIDIDOS E | 3
1. Safety
1.1 General
This Operation & Maintenance Manual contains basic information to be noted during in-
stallation, operation and maintenance. It is therefore essential that the contractor read the
manual 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 of Safety, the special
safety precautions outlined another section must also be observed.
1.2 Warning symbols 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 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! or INFORMATION!
Appear 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 that are affixed directly to the pump, such as
• Cable markings
• Markings for process fluid connections
must be observed without fail and remain fully legible at all times.

4 | Operation Manual MIDIDOS E | Safety
1.3 Qualification and training of personnel
The personnel employed for installation, operation, inspection and maintenance work must
be qualified to do so. The areas of responsibility, competence and supervision of the per-
sonnel must be precisely defined by the owner. Personnel who do not have the required
knowledge must be duly rained 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 Manual.
1.4 Important safety instructions
When installing and using this electrical equipment, basic safety precautions should
always be followed, including the following:
READ AND FOLLOW ALL INSTRUCTIONS!
WARNING!
To reduce risk of injury, do not permit children to use this product unless they are closely
supervised at all times.
WARNING!
Risk of electric shock. Connect only to a grounding type receptacle protected by a ground-
fault circuit-interrupter (GFCI). Contact a qualified electrician if you cannot verify that the
receptacle is protected by a GFCI.
Do not bury the cord. Locate the cord to minimize abuse from lawn mowers, hedge
trimmers, and other equipment.
WARNING!
To reduce the risk of electric shock, replace damaged cord immediately.
WARNING!
To reduce the risk of electric shock, do not use an extension cord to connect the unit to the
electricity supply; provide a properly located outlet.
SAVE THESE INSTRUCTIONS!
1.5 Hazards due to non-compliance with safety instructions
Failure to comply with safety instructions may endanger not only people, but also the en-
vironment and the dosing pump/system. Non-compliance with the safety instructions
can lead to the loss of all entitlement to damages.
WARNING!
WARNING!
WARNING!
WARNING!

Safety | Operation Manual MIDIDOS E | 5
The following hazard 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.
1.6 Safe operation
The safety instructions in this Operation & Maintenance Manual must be observed.
The owner is responsible for ensuring the compliance with local safety regulations.
1.7 Safety instructions for the owner/operator
• Leakages (e.g. due to ruptures in the lining) of hazardous substances (e.g. toxic or
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 regulations or chapter 1.4).
1.8 Safety instructions for inspection-, maintenance-, and installation work
The owner must ensure that all inspection, maintenance and installation work is under-
taken by authorized and duly qualified 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 decontami-
nated.
All safety mechanisms and guards must be refitted and reactivated as the work is comple-
ted.
The instructions outlined in chapter 7.2 “Installation location” and 9. “Start up” must be
observed before starting the pump/system.
1.9 Unauthorized modifications and production of spare parts
The dosing pump may only be modified or converted in consultation with the manufactur-
er. Genuine spare parts and accessories authorized by the manufacturer ensure greater
safety. The use of other parts can void the liability for the subsequent consequences.
1.10 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 our contracts, especially in our order
confirmation. The limit values specified in these documents must not be exceeded under
any circumstances.

6 | Operation Manual MIDIDOS E | Safety
1.11 Dosing of chemicals
CAUTION!
When working on dosing systems, the accident prevention regulations applicable on-site
must be observed and the specified personal protective clothing is recommended, depen-
ding on the hazard associated with the metered medium:
Googles Protective gloves Protective suit
It is recommended that all people responsible for the installation and maintenance of
piping, hoses and accessories should wear this protective clothing.
Before working in the dosing pump and plant, disconnect it from the power supply and
protect it from reconnection.
CAUTION!
Any chemicals 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. The dosing
lines must always be reconnected before starting the pump up again.
The chemical resistance of the pump’s materials of construction must be verified before
dosing with aggressive media!
The dosing pump’s dosing head as well as connections and lines of the system may be
under pressure. Work carried out on the dosing system requires special safety precautions
and may be carried out only by instructed technical personnel.
CAUTION!
Chemicals may spray out. This may lead to caustic or other burns. Always release the
pressure from the dosing pump system before starting work on the pump.
Flush the pump with a harmless medium (mainly water) before working on the dosing
head, valves and connections in order to avoid unintentional contact with the dosing
medium.
WARNING!
Never look into the open end of a clogged line or valve.
Chemicals may emerge unexpectedly and cause caustic or other burns to hand and face
Before start up, all connections must be inspected for correct tightness and, if necessary,
must be further tightened using the appropriate tools.
CAUTION!
CAUTION!
CAUTION!
WARNING!

Safety | Operation Manual MIDIDOS E | 7
CAUTION!
If connections at the dosing head are loosened during operation for venting or other rea-
sons, the leaked chemicals must be removed professionally. This is the only way to avoid
the danger of physical injury and corrosion at the dosing pump. Leaking chemicals may
also damage the diaphragm pump at its mounting points.
CAUTION!
When changing the chemical medium, check whether the pump and the system’s ma-
terials of construction are chemically resistant. If there is danger of a chemical reaction
between different media, a thorough cleaning is first mandatory.
IMPORTANT!
After adjusting the stroke length, the locking screw must be retightened. Otherwise the
adjusting knob may change its position. Thus causing irregular flow rates.
CAUTION!
The base area of the dosing pump must be kept clear to allow sufficient air circulation to
cool the motor down. If there is a danger of fluid collecting underneath the base of the
pump, the pump must be elevated.
DANGER!
Fire hazard. Pressure surge: catapulting parts could kill you. MIDIDOS E must not be used
under any circumstances in an explosive environment.
1.12 Scope of delivery
IMPORTANT!
Please unpack the dosing pump and ordered accessories with great care in order not to
miss any small parts. Immediately compare the scope of delivery with the delivery note.
The cause of any discrepancies must be determined.
CAUTION!
CAUTION!
CAUTION!
IMPORTANT!
DANGER!
IMPORTANT!

8 | Operation Manual MIDIDOS E | General
2. General
Dosing pumps are used to add chemicals in various processes. As leak free diaphragm
dosing pumps with a dosing range of between max. 2 l/h and 120 l/h the MIDIDOS E has a
broad field of application.
The MIDIDOS E is supplied as a simple dosing pump with the dosing head mounted on the
left hand side.
The motor is connected directly into a terminal box. The electrical power is supplied
through a three-phase motor. Operation with alternating voltage is likewise possible with
the use of an operating capacitor. To adapt the dosing performance the stroke length can
be set manually between 0 – 100%.

Function | Operation Manual MIDIDOS E | 9
3. Function
The gearbox is based on a single level worm-wheel transmission. The gear parts as well
as the storage are greased for life. The dosing stroke functions through a cam that the
membrane moves over a spring-loaded tappet. The siphon is reached through a spring-
loaded position.
Drive eccentric continues to run free until the plunger plate is reached again.
Legend
aRetaining spring for the siphon
bStroke limiter eccentric cams
cEccentric drive cam
dImpact plate
eDiaphragm rod
x
x
x
a e d
b
c

10 | Operation Manual MIDIDOS E | Technical Data
4. Technical Data
MIDIDOS E 24 E 48 E 72 E 120
Flow rate [l/h] - max. pressure [bar] 24 - 10 48 - 10 80 - 6 114 - 4
max. pressure at 1~ mode [bar] 10 5 3 2
Stroke frequency [1/min] 48 96 142 96
Stroke volume [ml/Hub] 8.5 8.5 8.5 20.8
Diaphragm-Ø [mm] 64 64 64 90
Suction lift [mbar] 700 700 700 300
Max. supply pressure [mbar]
(Sstatic + dynamic)
500 500 500 500
Double ball valve in pipe diameter DN6 DN6 DN6 DN10
max. environment temperature [°C] 45 (with PVC max. 40)
max. medium temperature [°C] 50 (wth PVC max. 35)
Motor specifications 3-Phase 400V / 50Hz - 440V/60Hz - 0,05kW - 0,5A
Motor specifications 1 -Phase 230V/50Hz - 0,05kW - 0,85A - IP55
120V/60Hz - 0,12kW - 2,2A - IP55
Weight of plastic model [kg] 7 7 7 8

Performance Curves | Operation Manual MIDIDOS E | 11
MIDIDOS E120
0
20
40
60
80
100
120
140
012345678910
Hubeinstellung
l/h
MIDIDOS E24
0
5
10
15
20
25
30
35
012345678910
Hubeinstellung
l/h
MIDIDOS E72
0
10
20
30
40
50
60
70
80
90
012345678910
Hubeinstellung
l/h
MIDIDOS E48
0
10
20
30
40
50
60
012345678910
Hubeinstellung
l/h
10 bar
2 bar
10 bar
2 bar
6 bar
2 bar
4 bar
2 bar
erstellt von Krischker
MIDIDOS E120
0
20
40
60
80
100
120
140
012345678910
Hubeinstellung
l/h
MIDIDOS E24
0
5
10
15
20
25
30
35
012345678910
Hubeinstellung
l/h
MIDIDOS E72
0
10
20
30
40
50
60
70
80
90
012345678910
Hubeinstellung
l/h
MIDIDOS E48
0
10
20
30
40
50
60
012345678910
Hubeinstellung
l/h
10 bar
2 bar
10 bar
2 bar
6 bar
2 bar
4 bar
2 bar
erstellt von Krischker
MIDIDOS E120
0
20
40
60
80
100
120
140
012345678910
Hubeinstellung
l/h
MIDIDOS E24
0
5
10
15
20
25
30
35
012345678910
Hubeinstellung
l/h
MIDIDOS E72
0
10
20
30
40
50
60
70
80
90
012345678910
Hubeinstellung
l/h
MIDIDOS E48
0
10
20
30
40
50
60
012345678910
Hubeinstellung
l/h
10 bar
2 bar
10 bar
2 bar
6 bar
2 bar
4 bar
2 bar
erstellt von Krischker
MIDIDOS E120
0
20
40
60
80
100
120
140
012345678910
Hubeinstellung
l/h
MIDIDOS E24
0
5
10
15
20
25
30
35
012345678910
Hubeinstellung
l/h
MIDIDOS E72
0
10
20
30
40
50
60
70
80
90
012345678910
Hubeinstellung
l/h
MIDIDOS E48
0
10
20
30
40
50
60
012345678910
Hubeinstellung
l/h
10 bar
2 bar
10 bar
2 bar
6 bar
2 bar
4 bar
2 bar
erstellt von Krischker
5. Mechanical Handling Capacity Performance Curves
The performance curves of the handling capacity are at 20°C (68°F) for water. Media (spe-
cific gravity and viscosity) and temperature change the handling capacity. Therefore dosing
pumps have to be litered out when used.
Stroke adjustment Stroke adjustment
Stroke adjustment Stroke adjustment

12 | Operation Manual MIDIDOS E | Measurement Drawing
6. Measurement Drawing
Dimensions in mm, Dimensions for MIDIDIS E 120 in parenthesis.
31
136 q
305~ (~359)
153~ (~252) 187~ (~297)
258~ (~284)
130~ (~145)
35211
100 q
9 O
47
175~

Installation | Operation Manual MIDIDOS E | 13
7. Installation
7.1 General information
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 for the pump, the handling of chemicals and the
electrical installation.
Likewise the technical data of the dosing pump (chapter 4) must be taken into considerati-
on. The system must be designed accordingly/properly (e.g. loss of pressure in the piping,
depending on nominal diameter and length).
The designer and the operator are responsible for ensuring that the whole system
including the dosing pump is constructed in such a way that neither plant equipment nor
buildings are damaged in the case of chemical leakage due to the failure of wear parts
(e.g. a rupture in the dosing membrane) or burst tubing. If the chemical system poses
great potential danger, the installation must be carried out in such a way that 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 draining pipe of the dosing head must be visible in order for a diaphragm failure to be
detected. The flow from the drainage pipe must be routed downwards without obstacles.
To increase the dosing accuracy and to ensure the functional reliability, we recommend the
use of additional accessories. These include, amongst others, backpressure 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 parts made out of PVC) can be tightened and loosened with grea-
ter ease if the thread is first lubricated with Vaseline or silicon grease.
NOTICE!
The compatibility of the lubricant with the dosing chemicals must be verified.
7.2 Installation location
The installation location of the dosing pump must be easily accessible for the operating
and service staff. When installing the dosing pump below the level of the process fluid,
care must be taken to ensure that chemical leakages due to a broken diaphragm cannot
cause any damage for example – collection pan, leakage sensor.
Further more it is possible to install the pump direct to the dosing supply tank.
The maximum environment temperature permissible for the dosing pump must be obser-
ved (see technical specifications). Heat radiation from the apparatus and heat exchanges
must be shielded from radiation heat, so that the dosing pump can sufficiently emit it own
heat. Direct sunlight must be avoided. When the dosing pump is installed in the open, a
canopy is provided as protection the effect of the weather.
IMPORTANT!
CAUTION!

14 | Operation Manual MIDIDOS E | Installation
The dosing pump is to be erected with the suction and pressure valves in an upright positi-
on. To guarantee its stability, the pump must be screwed appropriately into the ground.
The system’s piping must not put any force on the dosing pump’s connections or valves.
To avoid backfiring dosing after the process end, an electrical and hydraulically locking
device is provided on the dosing pump.
7.3 Drainage discharge
NOTICE!
Released gases can destroy the dosing pump’s transmission!
The drainage as well as the leakages from the separate chamber must slope downwards,
i.e. to go in a descent to the collection tank. Under no circumstances is the drainage pipe
to go direct through the lidded receptacle back to the medium; otherwise the released
gases can infiltrate the dosing pump’s transmission. The drainage pipe must be directed
only to a gas free collection tank (in a decline) or it has to be lead on a decline to a collec-
tion funnel over which it then has to end with enough distance in between. The leakages
can then be directed back via the funnel through the tank cover. Moreover possible
leakages are detected with greater ease from the gap to the collection funnel.
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 when the suction pressure is higher than the pressure system.
Safety and pressure relief valves protect the dosing pump and the associated accessories
and lines from overloads. They prevent an impermissibly high increase of pressure on
NOTICE!

Installation | Operation Manual MIDIDOS E | 15
the discharge side of the dosing pump that may be caused for example by the accidental
closing of valves whilst the pump is in operation or by a clogged injector.
The PENTABLOC is a combi-accessory that combines, amongst others, the function of a
pressure-sustaining valve as well as being a safety valve. Furthermore, the functions such
as anti-siphon, pressure-relief and flow indicator and monitor are also integrated.
7.5 Injection nozzles
Injection nozzles are used to mix the metered process fluid into a main stream and simul-
taneously fulfill 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 that can be dismantled for maintenance and shut off.
Injection fitting mounted from above
Injection fitting mounted
from below (for media with a
tendency to crystallize)
7.6 Electrical connection
• 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 experts.
• The type of cable and supply pipe’s cross section of the cable must be chosen in
accordance with the engine’s data.
• The connection of the cable to the engine terminal box must be carried out correctly.
We recommend a plug socket screw joint with strain relief.
• The required level of protection is guaranteed by the correct installation of the electri-
cal connector.
• To avoid incorrect dosing after the process ends an electrical and hydraulic locking
device is provided for the dosing pump.

16 | Operation Manual MIDIDOS E | Installation
Electrical connection data
(variants on request)
Pump sizes
MIDIDOS
voltage
[V]
output
[Watt]
electricity
[A]
E 24...120 400/230 50 0,50/0,87
50 Hz
440/254 80 0,46/0,80
60 Hz
400/230 80 0,42/0,73
60 Hz
230/1-Phase 50 0,85
50 Hz
120//1-Phase 120 2,2
60 Hz
Connection system for the driving motor
Supply of three-phase current
Y-circuit ∆-circuit
Alternating current supply with motor in the stonecutter circuit
clockwise counterclockwise
Special connector-variant: Other electrical connectors are to be taken from the separately
shown circuit diagrams.
W2 U2 V2
U1 V1 W1
L1 L2 L3 PE
W2 U2 V2
U1 V1 W1
L1 L2 L3 PE
Y-Schaltung -Schaltung
W2 U2 V2
U1 V1 W1
L1 N PE
W2 U2 V2
U1 V1 W1
L1 N PE
Rechtslauf Linkslauf
W2 U2 V2
U1 V1 W1
L1 L2 L3 PE
W2 U2 V2
U1 V1 W1
L1 L2 L3 PE
Y-Schaltung -Schaltung
W2 U2 V2
U1 V1 W1
L1 N PE
W2 U2 V2
U1 V1 W1
L1 N PE
Rechtslauf Linkslauf

Installation | Operation Manual MIDIDOS E | 17
7.7 Installation example
Legend
aMIDIDOS E
bElectric agitator
cChemical tank
dPulsation dampener
ePressure relief valve (safety valve)
fDiaphragm stop-valve
gInjection nozzle
g f e
d
a
b
c

18 | Operation Manual MIDIDOS E | Stroke Length Setting
8. Stroke Length Setting
CAUTION!
The pump’s stroke length is to be moved only when the motor is running!
Set the stroke length as follows:
1. Loosen the mounted screw of the setting knob anti-clockwise (around to the left)
2. Set the stroke length to the desired value according to the capacity performance
curves (chapter 5)
3. Under the retention of the stroke length setting, tighten the mount screw again.
CAUTION!

Start Up | Operation Manual MIDIDOS E | 19
9. Start Up
NOTICE!
Personal protective equipment as specified by on-site regulations must be worn at all
times while working on the dosing pump!
Goggles Protective gloves Protective suit
1. Before starting up the dosing pump all the stages for “Installation” in chapter 7 have
to be carried out. The safety advice must be adhered to.
2. The dosing pump is connected externally to the installed control system.
3. The manual performance setting should be set at maximum stroke length for impro-
ved suction. During the initial suction it should run without contra-flow pressure. For
this purpose the installation of a relief valve on the pressure side of the dosing pump
is recommendable.
4. If a suction aid is installed this has to be filled up with chemical beforehand. In case
the dosing pump does not have suction, loosen the pressure valves and fill the dosing
head with fluid when the pump is turned off. With safe media the dose medium itself
can be used, other a neutral medium that does not disturb the process. (In many
cases water is suitable).
WARNING!
Chemicals can 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.
5. If a venting facility is integrated in the dosing head or is available as a separate unit,
open it whilst the dosing pump is running until the 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)
6. If the ideal setting has been set, then the desired handling capacity is carried out at
the adjusting knob (see chapter 8). The first time it is filled use the capacity perfor-
mance curves (chapter 5). Depending on the installation and the chemicals used this
value may change and has to be verified under operation conditions.
7. 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.
WARNING!
NOTICE!

20 | Operation Manual MIDIDOS E | Shutdown
10. Shutdown
Before starting any maintenance and before prolonged downtime, drain the chemical from
the pump and rinse it out with a neutral medium.
CAUTION!
Excess chemicals must be disposed of in accordance with local rules and regulations.
Note the applicable accident prevention regulations and wear personal protective clothing.
Goggles Protective gloves Protective suit
CAUTION!
Next 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 chemicals will not spray out.
It is advisable to loosen the discharge and suction check valves in order to drain the dosing
head.
CAUTION!
CAUTION!
CAUTION!