DODA BG80 Series User guide

COSTRUZIONE MACCHINE AGRICOLE di DODA ALDO & C. s.n.c.
Via Sante Salmaso 18/20 46010 BUSCOLDO (MN) IT LY Tel. [phone] Fax. [phone]
http://www.doda.com Email: [e-mail]
USE AND MAINTENANCE BOOKLET
BG80 SERIES MIXER FOR BIOGAS DIGESTERS

BG80 USE AND MAINTENANCE BOOKLET
Rev.1 of 23/04/2013 of BG80 uk agg2013 Page 2 of 40
TABLE OF CONTENTS
1
1 GENERAL INFORMATION 3
1
1. .1 1. . HOW TO USE THIS MANUAL 3
1
1. .2 2. . PURPOSE OF THE MANUAL 3
1
1. .3 3. . WARRANTY GUIDELINES 3
1
1. .4 4. . MANUFACTURER DETAILS 3
1
1. .5 5. . PRODUCT DETAILS 4
2
2 GENERAL SAFETY INSTRUCTIONS 7
2
2. .1 1. . LABELS AFFIXED TO THE MIXER 7
2
2. .2 2. . SYMBOLS USED IN THE MANUAL 7
2
2. .3 3. . SAFETY GUIDELINES 7
2
2. .4 4. . PERMITTED USES 8
3
3 DESCRIPTION OF THE MACHINE 9
3
3. .1 1. . TECHNICAL SPECIFICATIONS 1
3
3. .2 2. . TECHNICAL DATA 11
3
3. .3 3. . PARTS PLATES 12
4
4 COMMISSIONING 14
4
4. .1 1. . CHECKS TO BE PERFORMED UPON INITIAL START-UP 14
4
4. .2 2. . PERIODIC CHECKS/ DAILY CHECKS 15
4
4. .3 3. . CHECKS TO BE PERFORMED DURING MIXER OPERATION 15
5
5 USE 16
5
5. .1 1. . INTENDED USE 16
5
5. .2 2. . VARIATIONS OF INTENDED USE 16
5
5. .3 3. . STANDARD OPERATION 16
5
5. .4 4. . OPERATION WITH INVERTER 19
6
6 PACKAGING, HANDLING, RECEIPT AND STORAGE 2
6
6. .1 1. . PACKAGING 2
6
6. .2 2. . HANDLING 2
6
6. .3 3. . HANDLING WITHOUT PACKAGING 21
6
6. .4 4. . RECEIPT 22
6
6. .5 5. . STORAGE 22
7
7 ORDINARY / EXTRAORDINARY MAINTENANCE 22
7
7. .1 1. . MAINTENANCE WORKS BASED ON DEGREE OF USAGE 23
7
7. .2 2. . ORDINARY MAINTENANCE 23
8
8 INSTALLATION 24
8
8. .1 1. . GENERAL INSTRUCTIONS TO PREPARE THE SITE 25
8
8. .2 2. . INSTRUCTIONS FOR SECURING THE MIXER IN PLACE 27
8
8. .3 3. . ELECTRICAL CONNECTION 28
8
8. .4 4. . INSTRUCTIONS FOR DISMANTLING THE MIXER 29
9
9 MIXER ADJUSTMENT INTERVALS 3
1
1 INFORMATION ON DANGEROUS AREAS 3
1
11 1 WORK EQUIPMENT 3
1
11 1. .1 1. . PERSONAL EQUIPMENT 3
1
11 1. .2 2. . COLLECTIVE EQUIPMENT 31
1
12 2 STAFF TRAINING 31
1
12 2. .1 1. . STAFF QU LIFIC TIONS 31
1
12 2. .2 2. . OPERATORS (checks and maintenance) 31
1
13 3 SPARE PARTS 33
1
13 3. .1 1. . CEILING-MOUNTED ASSEMBLY 33
1
13 3. .2 2 WALL-MOUNTED ASSEMBLY 34
13.3 EXPLODED VIEW DRAWING OF CEILING-MOUNTED CASING 35
1
13 3. .2 2. .
1
13 3. .4 4 EXPLODED VIEW DRAWING OF WALL-MOUNTED CASING 36
1
13 3. .5 5 EXPLODED VIEW OF BG8 TRANSMISSION 39

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1
1 GENERAL INFORMATION
1
1. .1 1. . HOW TO USE THIS MANUAL
The inclusion of a general table of contents on page two enables the reader to locate the relevant topic
immediately, making it easier to consult the manual.
The chapters are organised sequentially based on topic, making it easier for the reader to find the desired
information.
1
1. .2 2. . PURPOSE OF THE MANUAL
This manual was compiled by the manufacturer to provide the necessary information to all parties authorised to
safely carry out transport, handling, installation, maintenance, repair, dismantling, disposal or storage
operations in relation to the mixer.
Information relating to the electric motor and the reducer can be found in the Use and Maintenance Booklets
for the motor and the reducer respectively.
Failure to comply with this information may pose a risk to the health and safety of persons and may also cause
economic damage. This information must be stored carefully by the person in charge so that it can be retrieved
and consulted at any given moment, and must be kept in perfect condition.
In the event of loss of, or damage to, the documentation, a replacement copy must be requested directly from
DODA COSTRUZIONE MACCHINE AGRICOLE by Doda Aldo & c. s.n.c.
DODA COSTRUZIONE MACCHINE AGRICOLE by Doda Aldo & c. s.n.c. reserves the right to change,
supplement or improve this manual; such changes shall not, however, constitute a reason to consider this copy
inadequate.
The manual drafted to comply with the ATEX directive forms an integral part of this use and maintenance
manual
1
1. .3 3. . WARRANTY GUIDELINES
Doda provides a 12 month warranty on its products which is valid from the moment of commissioning but
limited to an 18 month-period from the date of shipping.
The warranty shall not apply if the problem or fault results from the incorrect or unsuitable use of the product, or
if the aforementioned use does not correspond to that for which it was commissioned.
The warranty provisions offered by DODA are limited to the repair or replacement of products reported as
faulty, following an assessment by DODA to ascertain the actual state of the product.
DODA shall not, therefore, be held liable for any material or economic damage arising from the faulty
product, only for the repair or replacement of the product itself.
The Mixer must be used in environments and for uses that correspond to those provided for during the
design phase.
Any improper use of the Mixer is prohibited.
Any modification to or replacement of machine parts, without prior authorisation by DODA, may constitute a
risk factor for accidents and, in this case, the manufacturer shall be absolved of all civil and criminal liability,
and the warranty shall be deemed void.
1
1. .4 4. . MANUFACTURER DETAILS
DODA COSTRUZIONE MACCHINE AGRICOLE di Doda Aldo & c. s.n.c.
Strada Sante Salmaso, 18/20 - Loc. Serraglio
– 46010 – Buscoldo di Curtatone (Mantua)

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1
1. .5 5. . PRODUCT DETAILS
1
1. .5 5. .1 1. . LABEL
Each mixer is equipped with an identification plate and a declaration of conformity (as per annex VIII) in
accordance with standard 94/4/EC.
The identification plate contains the main technical information relating to the operating and manufacturing
specifications of the mixer; it must therefore be maintained in full and in a visible location.
A sticker is provided with this manual which reproduces the information of the plate affixed to the mixer unit,
and lists the product specification data.
It is recommended that you place this sticker in the dedicated space on this manual, and refer to it when
information or clarifications are required.
1) 1) Manufacturer name and address
SAMPLE LABEL
2) Type: article part of the product code
3) Vers: variable part of the product code
4) S.N.: serial number
5) Year of manufacture
6) kW: motor output
7) Supply voltage frequency
8) Supply voltage and current
9) Number of phases
10) Number of revs/minute on output
11) -EX Marking
12) Mass
13) The propeller must be fully submerged when the
mixer is operating

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1
1. .5 5. .2 2. . ATEX MARKING
EXPLANATION OF ATEX MARKINGS (potentially explosive atmosphere)
II 2 G Ex ck IIA T4
1 2 3 4 5 6 7 8 9
The following summary is provided in accordance with EN 60079-0:
1
This symbol complies with annex X of directive 94/9/EC and indicates that the product complies
with the mandatory health and safety requirements of the aforementioned directive
2
This symbol is specific to the ATEX 94/9/EC directive and is included in annex II of the directive
itself
3
II
Group to which the relevant piece of equipment belongs. This group refers to equipment that can
be used in all locations with the EXCEPTION of MINES.
4
2
Category of the equipment to which the certification relates (products designed to operate in
zone 1
5
G
Explosive atmospheres in the form of gas, vapour or mist may permissibly occur in the vicinity of
the equipment.
6
Ex
Ex Symbol for electrical equipment intended for use in potentially explosive atmospheres
required by the technical guidelines.
7
ck
Mechanical protection method used for the equipment corresponds to both protection by
constructional safety and protection by liquid immersion
8
IIA
Group to which the flammable substances / category of gas for which the equipment is suitable
belongs
9
T4
Maximum surface temperature of the equipment (T4=135°C)
1
1. .5 5. .3 3. . MIXER IDENTIFICATION LABEL
BG80

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1
1. .5 5. .4 4. . CE DECLARATION OF CONFORMITY
ATTESTATO DI CONFORMITÀ
CERTIFICATE OF CONFORMITY
DODA COSTRUZIONE MACCHINE
AGRICOLE di Doda Aldo & C. s.n.c. Dichiara sotto la propria responsabilità che il prodotto:
Mixer Series BG80
Strada Sante Salmaso, 18/20 - Serraglio
– 46010 – Buscoldo di Curtatone (Mantua) Declares under its sole responsibility that the
product
l quale questa dichiarazione si riferisce, è
conforme alla seguente direttiva:
94/9/EC
To which this declaration relates, complies with the
following directive:
La conformità è stata verificata sulla base dei
requisiti delle norme o dei seguenti documenti
normativi
EN 13463-1
EN 13463-5
UNI EN ISO 4413: 2012
UNI EN 1127-1: 2008
UNI EN ISO 12100: 2010
IEC EN 60079-(IEC 31-70)
EN 60079-15
EN 1127-1
Conformity has been verified on the basis of the
requirements set forth in the following standards or
regulatory documents
Tipo di protezione TEX
II 2G Ex ck IIA T4
TEX Protection type
I file tecnici
The technical files
sono stati depositati presso l’Organismo Notificato
accreditato per il deposito del fascicolo tecnico
have been deposited with the accredited Notified
Body for the deposit of technical documents
DODA COSTRUZIONE MACCHINE AGRICOLE di Doda Aldo & c. s.n.c.
Firma utorizzata
(Funzione: Legale Rappresentante)
uthorized Signature
(Function: Legal Representative) (Doda Aldo)
Persona autorizzata a costituire il fascicolo tecnico
Doda Ada
Person authorised to compile the technical file
Indirizzo della persona autorizzata a costituire il fascicolo tecnico Strada Sante Salmaso, 18/20 - Serraglio
– 46010 – Buscoldo di Curtatone (Mantua)
ddress of the person authorised to compile the technical file
Luogo e data dell’emissione Buscoldo, 24-04-2013
Place and date of issue

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2
2 GENERAL SAFETY INSTRUCTIONS
2
2. .1 1. . LABELS AFFIXED TO THE MIXER
Read the use and maintenance manual instructions
Danger warning.
IMPORTANT: prior to use, fill with oil up to the required level.
Fill with oil up to the level indicated.
Check the level regularly.
This sticker reminds you to check the rotation direction of the electric motor before
starting it up.
2
2. .2 2. . SYMBOLS USED IN THE MANUAL
The following symbols are used in the manual to highlight particularly important instructions and warnings:
MEANING NOTE SYMBOL
PROHIBITION
This symbol indicates that it is prohibited to perform manoeuvres
and operations with the machine which may, under certain
conditions, pose a risk to the safety of the operator, to the
machine itself, or to adjacent parts/structures.
DANGER
This symbol draws attention to important warning messages that
are fundamental to the safety of the operator and of the
machine.
ELECTRICAL
DANGER
This symbol indicates the existence of danger caused by electric
energy.
EX WARNING This symbol draws attention to a particularly important warning
regarding potentially explosive atmospheres
WARNING This symbol draws attention to a particularly important warning
2
2. .3 3. . SAFETY GUIDELINES
Local authorities' safety regulations in relation to biogas plants must be observed.
Generally accepted regulations, as well as legislative provisions regarding the prevention of accidents, must
also be observed.
Important: repairs must be performed by an authorised workshop or by the manufacturer's technical assistance
staff.

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If the use and maintenance instructions provided in this manual are not adhered to, the manufacturer shall not
be held liable for operating faults.
2
2. .4 4. . PERMITTED USES
The mixer is suitable for installation on Biogas digesters; it can be mounted on the wall or the ceiling
of the tank, and is designed to homogenise the biomass, even in the presence of non-homogeneous
material.
The BG80 mixer must be used exclusively for the homogenisation of biomass in digesters and in fermentation
containers with fermentation substrates, such as sewage, non-homogeneous material and other co-ferments.
This mixer cannot be used to homogenise and mix the following substances:
Mud residue from clarification
Solid, voluminous substances
Materials with sharp edges that may damage the mixer
Materials mixed with foreign bodies (cords, ropes, plastic ribbons,...)
All uses other than that specified herein are prohibited.
The user and owner of the mixer shall therefore be held directly responsible for any damage resulting from
incorrect use of the product.
To ensure correct use:
- Adhere to the instructions contained in this booklet;
- Observe the specified intervals for checks and maintenance operations.
In order to comply with the product classification in accordance with ATEX directive 94/9/EC, users must
respect the technical data specified on the information plate and the documentation; the latter must be stored
near the equipment, or somewhere known and easily accessible to the user and the maintenance technician.
Transport, storage, maintenance, and commissioning operations, etc., must be performed by specialised staff
in areas free from explosive atmospheres. It is mandatory that the electric power supply to the mixer is
deactivated during such operations so that the mixer out of service, and the operator must take all possible
precautions against any conditions which may cause the involuntary start-up of the mixer, or any movement of
the unit parts.
The BG80 mixer is intended for use in atmospheres at risk of explosions due to the presence of gas-air
mixtures.
Equipment pertaining to group II and category 2 can be used in zones 1 and 2 where explosive atmospheres,
in the form of gas clouds in the air, may occasionally occur during operation; only use the mixing unit with other
equipment if the latter equipment is authorized to operate in the same zones.
The instructions provided in this manual are only applicable to biogas digesters that are used in
areas with potentially explosive atmospheres.
Failure to observe the safety instructions may cause explosions!
The ATEX mixer, identified by the Ex mark, is certified - in accordance with the explosion-proof protection
method specified on the plate - for operation in the presence of Explosive Gas in environments classified as
zones 1 or 2

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To ensure Atex conformity as declared, the mixer propeller must be immersed in the biomass at all
times during operation.
The biomass level must never fall below the body of the propeller; to this end, implement a level gauge
system using floats, level probes or, alternatively, introduce supervised operation (person present)
Any intervention that modifies the mixer parts may result in the Risk of Explosion.
The mixer must only be used in environments compatible with the specifications shown on the plate
Smoking, and the use of naked flames, mobile phones or portable radio transceivers are
prohibited in areas at risk of explosion
3
3 DESCRIPTION OF THE MACHINE
The BG80 mixer has been designed primarily to operate in fermentation tanks, where a high degree of dry matter
is present (co-ferments, ...)
The purpose of the mixer is to prevent the formation of floating layers of sediment in the fermentation tank and to
ensure that the ferments are properly mixed.
The BG80 machine is equipped with a hydraulic cylinder to enable the angle of inclination of the propeller in the
tank to be adjusted, thus ensuring optimal mixing efficiency. A manual oil pump is usually supplied to operate the
cylinder; this is fixed to the frame of the mixer, or located near the machine. Upon request it is possible to fit the
machine with a kit to operate the cylinder using an electric hydraulic pump.
The ferments and the digester gas are securely hermetically-sealed thanks to a robust expansion joint with a
flange; this is firmly secured to the transmission and to the mixer frame.
As the bacteria is mixed with a stroke that is both vigorous and gentle, the gas bubbles that form in the fermented
matter are encouraged to rise to the surface and are consequently released.
This is in contrast to the alternative uncontrolled "growth" of the ferment.
The operating time of the mixer can be varied to meet specific requirements; it is generally advisable to use an
inverter to adjust the number of motor revolutions to suit the type of substrate being treated. This prevents
unnecessary operations, and optimises electric energy consumption.
It is important to set the correct operating time and the number of revolutions of the mixer motor, particularly
during the filling and start-up phases.
It is generally recommended that the motor is set to a high number of revolutions initially; this should then be
gradually reduced when normal the operating cycle begins.
There should be no white patches on the surface of the fermentation material (sulphur deposits) and no material
of any kind should be deposited in the tank.
Furthermore, attention must be paid to the maximum refill level in the tank, particularly in the case of high walls or
large quantities of manure.
In the event that either an amount of product is introduced into the tank which leads to an unexpected increase in
the mass, or an increase in sulphur deposits occurs, the mixer operating time should be increased, and the
number of motor revolutions should also potentially be increased.
Optimal mixing is obtained using a three blade propeller and the correct inclination of the propeller.

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The mixer is equipped with a robust vibration-resistant frame; this is designed for installation either on the wall or
on the ceiling, and is capable of supporting the gearbox.
3
3. .1 1. . TECHNICAL SPECIFICATIONS
The information provided refers to a standard delivery.
The manufacturer reserves the right to carry out technical modifications, without being required to
communicate these to the users.
1. All parts of the mixer that come into contact with the fluid, as well as all components incorporated into the
tank, are made from stainless steel;
2. The mixer shaft sits in an oil bath;
3. Widia mechanical seal with sliding ring on the transmission shaft;
4. Transmission lubricant oil level check using an indicator, positioned at the point of connection between
the reducer and the transmission;
5. Reducer unit with 80 revs/min of the propeller, motor with 1450 revs/min at 50 Hz;
6. Three-blade self-cleaning propeller, secured to the shaft of the transmission using a hub;
7. Hydraulic adjustment of the mixer depth using a hand pump and
connection tubing, supplied as standard with the equipment;
8. Assembly frame for installation on ceiling or wall;
5
4
7
8
2
6
3

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3
3. .2 2. . TECHNICAL DATA
The information provided refers to a standard delivery.
The manufacturer reserves the right to carry out technical modifications, without being required to
communicate these to the users.
INFORMATION MODEL BG8 22 kW BG8 18.5 kW
Electric Motor
Electric motor
nominal power
22 kW
18.5 kW
Electric motor
-
no. of poles
4
4
Nominal voltage at ∆ / λ
400 V / 690 V
380 V / 660 V
Nominal current at ∆ / λ
44 / 25.40
39.55 / 22.83 .
Frequency
50 Hz
50 Hz
Cos phi power factor
0.79
0.79
No. of revs
1470
revs / min
1465 revs / min
Electric motor noise level
70 dB
70 dB
TEX Classification
II 2G Ex
-
d
II 2G Ex
-
d
S9 Service variable speed
Frequency at 10
Hz
Power
3.17
2.66
No. of revs
294
293
Nominal current at ∆
34.26
30.7
Torque
102.91
86.8
Frequency at 50
Hz
Power
15.84
13.32
No. of revs
1470
1466
Nominal current at ∆
31.79
28.5
Torque
102.91
86.8
Temperature probe
PTC 120°
PTC 120°
Coaxial reducer
Transmission ratio
1 / 19.3
1 / 22.1
Maximum applicable power
24
24
Max no. of
revolutions on input
2,850
2,850
Reducer oil quantity
16.5 18 litres SHELL
OMALA
S4 WE 320 (or equivalent)
16.5 18 litres SHELL
OMALA
S4 WE 320 (or equivalent)
ssembly position
M3
M3
Type
STM MF3 120/2
STM MF3 120/2
TEX Classification
II 2G ck
T4
II 2G ck T4
Mixer
Propeller diameter
1600 mm
1500 mm
Transmission oil quantity
42 kg S E80
–
W90
42 kg S E80
–
W90
Hand pump hydraulic oil quantity
3 litres Nuto 68 (or equivalent)
3 litres Nuto 68 (or equivalent)
Total Weight
960 kg
950 kg
N.B.:
Should the motor, the coaxial reducer or the frame of the machine require additional painting, the overall
thickness must not exceed 170 µm. This is fundamental in order to prevent the potential formation of
electrostatic charges.

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3
3. .3 3. . PARTS PLATES
The plates listed here below relate to the electric motor for the standard BG80 18.5 kW and BG80 22 kW
models.
Electric motor
Specific plate with technical data for use with variable speed of
the 18.5 kW electric motor
Specific plate with technical data for u
se with variable speed
of the 22 kW electric motor
Specific plate for 18.5 kW electric motor
Specific plate for 22 kW electric motor
Plate Position for Use with Variable Speed
Motor Information Plate
Position
Atex Labelling

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The plates listed here below relate to the electric motor for the standard BG80 18.5 kW and BG80 22 kW
models.
Reducer
Reducer plates for the 18.5 kW BG8 mixer
Reducer plates for the 22 kW BG8 mixer
Reducer Plate Position
Atex Plate
Atex Plate

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4
4 COMMISSIONING
4
4. .1 1. . CHECKS TO BE PERFORMED UPON INITIAL START-UP
Ensure that the motor rotates in a clockwise direction (as shown by the arrow located on the motor), run the
motor for a number of seconds, ensure that the motor's cooling fan, and therefore the propeller, rotate in a
clockwise direction.
If the propeller is not clearly visible when close to the mixer, check the rotation direction on the mixing blade of
the drive motor.
There is a risk of damage to the mixer, to objects and to people if the machine is used in the
opposite rotation direction to that specified.
Check that the mixer is correctly secured to the chosen installation surface.
Check that all screws that come into contact with the mixer are correctly tightened.
Both the moving parts of the orientation device and the support bearings for the fixing screws must be
sufficiently lubricated.
Check that the oil levels in the transmission, the gearbox and the hand pump for hydraulic adjustment, and then
start the machine up.
The correct quantity of oil is as follows:
⇒18 litres of SHELL OMALA S4 WE 320 (or equivalent) for the reducer;
⇒42 litres of SAE80 oil – W90 for the transmission;
⇒3 litres of Nuto 68 oil (or equivalent) for the hand pump.
To check the oil, proceed as follows:
-Unscrew the inlet cap and the breather cap if present;
-If the oil has been refilled, wait at least 3 hours before turning on the machine;
-Close the caps.
-Check the levels periodically, the oil must never fall below the specified level.
N.B.: N.B. During filling and inspection, the transmission pipe should be in the vertical position.

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1) Transmission oil level
2) Oil Breather/ Transmission Oil fill
3) Reducer Oil Level
4) Oil Breather/ Transmission Oil fill
4
4. .2 2. . PERIODIC CHECKS/ DAILY CHECKS
Check all moving parts and lubricate regularly (approx. every 50 operating hours) Remove the old, used
lubricant.
Check the stability of the fixing screws on the mixing frame orientation device daily, and those of the hydraulic
cylinder.
If these are damaged or not properly secure, the mixer must be shut down promptly to address the
fault which has been identified.
All screws and nuts must be firmly tightened as indicated in Table in Chapter 8, and must be
checked daily. Any interventions in this regard must be documented.
Carry out daily checks to ensure that none of the rubber parts of the expansion joint are damaged or
torn.
Before starting the mixer each time, check that the electrical network, or rather the power line, meets
the requirements of the provisions in force. Check that the voltage indicated on the motor label
corresponds to the voltage supplied by the electrical network.
4
4. .3 3. . CHECKS TO BE PERFORMED DURING MIXER OPERATION
Check that:
⇒There are no solid substances blocking the propeller;
⇒The propeller must always be sufficiently immersed in the product being mixed;
Fig. 4
1
3
4
2

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⇒The mixer must be kept free from snow and ice.
There is a risk of explosion caused by overheating of the intermediate and lower bearings, resulting
from insufficient lubrication.
During mixing, beware of any unusual noises; these may be caused by insufficient lubrication, loose
parts or faults in the motor, the gearbox, the bearings or the crankshaft, etc.
The presence of foreign bodies such as cords, ropes and plastic ribbons may cause the mixing
propeller to become unbalanced and, consequently, may cause damage to the bearings and to the
entire machine.
Such foreign bodies may also damage to the mechanical seal.
On rare occasions, if the equipment is installed in a fixed location, it is possible that local corrosion of the
material may occur.
This phenomenon is generally caused by stray currents (displacement of potential, improper grounding) or
electrochemical reactions (significant acidification of the co-ferments and wet waste, often at temperatures
exceeding +45°C).
5
5 USE
5
5. .1 1. . INTENDED USE
The equipment is to be used exclusively for mixing in Biogas digesters, in the locations specified in this
manual: wall and/or ceiling application.
All other uses are prohibited.
Any other use must be authorised and certified by the manufacturer.
5
5. .2 2. . VARIATIONS OF INTENDED USE
There are no present variations of intended use.
5
5. .3 3. . STANDARD OPERATION
Depending on the type of application chosen, the mixer is equipped with a frame for installation on the ceiling
or on the wall.
Normally, the arm inclines horizontally to the left in relation to the wall of the tank, upon request a version with
the arm inclined to the right can be provided.
The machine is equipped with a hydraulic device for the inclination of the mixing propeller.
A manual oil pump is usually supplied to operate the cylinder; this is fixed to the frame of the mixer, or located
near the machine. Upon request it is possible to fit the machine with a kit to operate the cylinder using an
electric hydraulic pump.

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To change the inclination of the mixer using a hand pump, follow the following procedure:
- move the flow change lever to the left or to the right (see image below)
- engage the lever and perform an alternating vertical movement until the desired inclination of the mixer has
been obtained
- return the flow change lever to the central position
Step 1
Step2

BG80 USE AND MAINTENANCE BOOKLET
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Step3
.
The propeller must rotate in a clockwise direction.
When the tank is full, the rotation direction can only be identified based on the propulsion of the fluid in the
container: this should move towards the centre of the tank.
Operating the mixer in the opposite direction to the specified rotation direction may cause
strong vibrations and may result in serious damage to both the mixer and the tank.
Because the composition of the substrate to be mixed may vary, the immersion depth of the mixing propeller
should be adjusted and the complete immersion of the blade of the propeller during mixing should be verified.
Whirlpools or sprays of fermentation material must not occur during operation.
The mixer must only be used in a tank that is sufficiently full and with propeller blade cover of at least
0.5 m.
If the propeller is partly uncovered, a strong degree of lateral oscillation will be evident,
particularly in the motor-transmission unit. Such oscillation could cause damage to the mixer
and to the tank.
The mixer transmission may be damaged by excessive lateral thrust caused by excessive floating material; the
propeller blade may also be subject to excessive stress which may have negative consequences on the
stability of the tank.
During normal operation it is possible that the mixer may oscillate laterally; if this vibration occurs within a
range of a couple of centimetres, it should not be considered dangerous. This low level of oscillation is due in
part to the significant robustness of the machine frame.
It may be necessary to increase the number of motor revolutions to counteract more significant oscillations; this
operation may only be performed by fitting an inverter, following prior authorisation by the manufacturer.

BG80 USE AND MAINTENANCE BOOKLET
Rev.1 of 23/04/2013 of BG80 uk agg2013 Page 19 of 40
If the number of motor revolutions is too low when an inverter is used, strong vibrations and lateral
oscillations may occur; in this case the number of revolutions should be increased to avoid damage to
the mixer and to the tank
If satisfactory mixing performance is not achieved despite having observed the above-listed instructions, (as a
result of the large diameter of the tank or the high proportion of dry content), the mixer dealer or manufacturer
should be promptly informed.
The dealer or the manufacturer shall not be held responsible for damage resulting from incorrect use of the
mixer.
Potential formation of floating material on the surface may be due to:
- Digester tank filling with an already fermented substrate from other tanks of the Biogas plant:
- A high proportion of dry material content;
- A fault in the Biogas system and consequent unexpected mixer run-down time;
- A fault in the mixer.
If large quantities of floating material are present, the necessary counter-measures should be taken
before starting the mixer. These measures must be agreed upon with the dealer or manufacturer of the
mixer.
5
5. .4 4. . OPERATION WITH INVERTER
To enable inverter-powered operations, the motors are equipped with a temperature control system using PTC
or PT 100 thermistors inserted in the coil that ensure that the temperature range limits are maintained.
The user must connect the terminals of the PRC or PT 100 to a trip relay that will cause the electrical
supply to disconnect if dangerous temperatures are reached.
This trip system must only ever be reset manually, never automatically.
In order to comply with regulations the user must:
- Use a trip system that complies with the principles of standard IEC 61508 (must be Fail Safe);
- Use a double protection circuit.
The motors for inverters are equipped with a supplementary plate. Before starting the motor, check that it
meets the performance requirements (kW, Hz and torque) indicated on the supplementary plate; in the absence
of these indications, the user should contact the manufacturer.
If powered by an inverter, the power may be slightly reduced to maintain the specified temperature range and
prevent potential damage from overheating.
When choosing an inverter, the user must consider that the motor must not be subjected to voltage peaks
greater than 1.4 times the nominal voltage; otherwise, the lifespan of the coil insulation will be slightly reduced.
It should be borne in mind that if an inverter is used, the installer is responsible for carrying out the checks and
taking any necessary precautions in relation to emission and immunity limits as per the "Electromagnetic
Compatibility (EMC)" directive 2004/108/EC and subsequent modifications.

BG80 USE AND MAINTENANCE BOOKLET
Rev.1 of 23/04/2013 of BG80 uk agg2013 Page 20 of 40
6
6 PACKAGING, HANDLING, RECEIPT AND STORAGE
6
6. .1 1. . PACKAGING
The shape and size of DODA mixers means that it is not possible to fully package the machine. As
such, they are transported directly on the truck-beds or inside containers, with only the electric motor
fully protected.
6
6. .2 2. . HANDLING
To move the items, using lifting devices that are compatible with the type of packaging and that indicate a
sufficient lifting capacity.
Do not tilt or overturn during lifting and transport.
If the packages are unloaded using a forklift truck, ensure that the weight is also balanced on the forks.
If the packages are unloaded using a hoist or using a hook of any kind, ensure that the load is balanced
and that the harness consists of lifting accessories that meet legal requirements.
If necessary, place a sufficient number of wooden blocks under the package to facilitate the lifting process.