Coltri Sub MCH 13/ET User manual

Revision: DOC MCH 13-16-26-32/ET-04-00
INSTRUCTION
MANUAL
VERSION: English
Special equipment and compressors for underwater activities
High Pressure Compressors
High Pressure Compressors

2
GUGU
GUGU
GUARANTEEARANTEE
ARANTEEARANTEE
ARANTEE ANDAND
ANDAND
AND ASSISTASSIST
ASSISTASSIST
ASSISTANCEANCE
ANCEANCE
ANCE
1.1 Guarantee ............................................................................................................................ 8
1.2 Assistance ........................................................................................................................... 8
11
11
1
22
22
2
USE IN BRIEFUSE IN BRIEF
USE IN BRIEFUSE IN BRIEF
USE IN BRIEF
TECHNICAL DESCRIPTIONTECHNICAL DESCRIPTION
TECHNICAL DESCRIPTIONTECHNICAL DESCRIPTION
TECHNICAL DESCRIPTION
2.1 Operating principle ............................................................................................................... 10
2.2 Description of the pump unit .................................................................................................11
2.2.1 Monobloc unit .............................................................................................................12
2.2.2 Head unit .................................................................................................................... 13
2.2.3 Safety valves ............................................................................................................... 13
2.2.4 Lubricating unit ............................................................................................................ 14
2.2.5 Pressure maintenance valve ........................................................................................ 14
2.2.6 Cooling pipes .............................................................................................................. 14
2.2.7 Filters .......................................................................................................................... 15
2.2.8 Frame and sound-proofed casing ................................................................................. 16
2.3 Machine control ................................................................................................................... 16
33
33
3TECHNICAL CHARACTERISTICTECHNICAL CHARACTERISTIC
TECHNICAL CHARACTERISTICTECHNICAL CHARACTERISTIC
TECHNICAL CHARACTERISTIC
3.1 Technical characteristics of the pump unit ............................................................................ 18
3.1.1 Machine series MCH 13-16-26-32/ET .......................................................................... 18
3.1.2 Sizes and weights ....................................................................................................... 19
3.2 Noise ................................................................................................................................... 19
44
44
4PRECAPRECA
PRECAPRECA
PRECAUTIONS FOR USEUTIONS FOR USE
UTIONS FOR USEUTIONS FOR USE
UTIONS FOR USE AND MAINTENAND MAINTEN
AND MAINTENAND MAINTEN
AND MAINTENANCEANCE
ANCEANCE
ANCE
4.1 Machine area diagrams ........................................................................................................ 21
4.1.1 Safety devices ............................................................................................................. 22
4.1.2 Residual risk areas ..................................................................................................... 24
Use in brief ..................................................................................................................................... 7
Index

3Index
55555
UNPUNPUNPUNPUNPAAAAACKINGCKING
CKINGCKING
CKING AND HANDLINGAND HANDLING
AND HANDLINGAND HANDLING
AND HANDLING THE MATHE MATHE MATHE MATHE MACHINECHINECHINECHINECHINE
5.1Unpacking the machine........................................................................................................25
5.2Pack contents......................................................................................................................26
5.3Handling the machine...........................................................................................................26
66666
INSTINSTINSTINSTINSTALLAALLAALLAALLAALLATIONTIONTIONTIONTION
6.1Positioning...........................................................................................................................27
6.2 Connections.........................................................................................................................28
6.2.1 Connecting the extension for the air intake...................................................................28
6.2.2 Connecting the refill hoses..........................................................................................32
6.2.3 Electrical connections.................................................................................................33
CONTRCONTRCONTRCONTRCONTROL POL POL POL POL PANELANELANELANELANEL
7.1 Control panel........................................................................................................................34
7.2Indication and control devices..............................................................................................35
77777
STSTSTSTSTARARARARART UPT UPT UPT UPT UP
8.1Filling the machine...............................................................................................................36
8.2Checks................................................................................................................................37
88888
USUSUSUSUSEEEEE
9.1Preliminary operations.........................................................................................................40
9.2Refilling the cylinders...........................................................................................................43
99999

4
1010
1010
10 PUTTINGPUTTING
PUTTINGPUTTING
PUTTING THE MATHE MA
THE MATHE MA
THE MACHINE OUT OF OPERACHINE OUT OF OPERA
CHINE OUT OF OPERACHINE OUT OF OPERA
CHINE OUT OF OPERATIONTION
TIONTION
TION
AND DISMANTLING THE MACHINEAND DISMANTLING THE MACHINE
AND DISMANTLING THE MACHINEAND DISMANTLING THE MACHINE
AND DISMANTLING THE MACHINE
10.1 Instructions for prolonged machine standstills ...................................................................... 46
10.2 Disposal of waste products .................................................................................................. 46
10.3 Dismantling the machine ...................................................................................................... 47
MAINTENANCEMAINTENANCE
MAINTENANCEMAINTENANCE
MAINTENANCE
11.1 General notes ...................................................................................................................... 48
11.2 Preventive maintenance ........................................................................................................ 49
11.3 Changing the lubricant oil ..................................................................................................... 50
11.4 Checking the transmission belt ............................................................................................ 51
11.5 Air intake filter ...................................................................................................................... 53
11.6 Active carbon filter and molecular sieve ................................................................................ 55
11.7 Refil hose ............................................................................................................................. 57
11.8 Intake and discharge valves .................................................................................................. 58
11.9 Heads .................................................................................................................................. 58
11.10 Cylinders .............................................................................................................................. 59
11.11 Maintenance programme ...................................................................................................... 60
1111
1111
11
TRTR
TRTR
TROUBLESHOOOUBLESHOO
OUBLESHOOOUBLESHOO
OUBLESHOOTINGTING
TINGTING
TING
12.1 List of faults ......................................................................................................................... 62
1212
1212
12
MACHINE DIAGRAMSMACHINE DIAGRAMS
MACHINE DIAGRAMSMACHINE DIAGRAMS
MACHINE DIAGRAMS
13.1 Compression diagram .......................................................................................................... 63
13.2 Electrical diagram ................................................................................................................ 64
1313
1313
13
Index

5
SPSP
SPSP
SPARE PARE P
ARE PARE P
ARE PARAR
ARAR
ARTSTS
TSTS
TS
14.1 Exploded view of the machine parts .................................................................................. 69
Monobloc .......................................................................................................................... 70
Pistons rod unit ................................................................................................................. 72
Cylinders unit .................................................................................................................... 74
Head unit .......................................................................................................................... 76
Cooling pipes .................................................................................................................... 78
Filtering system ................................................................................................................80
MCH 13-16/ET condensate trap ........................................................................................ 82
MCH 26-32/ET condensate trap ........................................................................................ 84
MCH 13-16/ET .................................................................................................................. 86
MCH 26-32/ET .................................................................................................................. 88
MCH 26-32/ET front panel ................................................................................................. 90
1414
1414
14
Index

6
To make the manual easier to read, the following terms have been adopted:
DANGER
The term DANGER is used when failure to comply with the regulations or tampering with the
parts could lead to serious injury or even death.
WARNING
The term WARNING is used when failure to comply with the instructions could cause damage to the
machine and other parts associated with the same or to the surrounding area.
LABEL APPLIED TO THE COMPRESSORS
To protect exposed persons or objects, a special booklet entitled “SAFETY REGULATIONS” is supplied
with the machine and must be considered an integral part of the Compressor Instruction Manual.
This manual is the property of AEROTECNICA COLTRI S.r.l. and any copying of the same, even partial, is
prohibited.
Use in brief

7
The following information must be referred to and applied only when this manual and the
“Safety regulations” manual have been read and their contents have been understood and
assimilated.
- Check whether or not the area where the machine is installed has suitable ventilation
(see chapter 6.1).
- If the machine is installed in a place without the required characteristics above, connect the air intake
extension (see chapter 6.2.1).
- Connect the refill hoses to the machine (see chapter 6.2.2).
- Connect the switchboard to the mains power supply (see chapter 6.2.3).
- Check the level of the lubricating oil in the pump unit (see chapter 8.2). If the level is too low, turn off
the machine and add or change the oil (see chapter 8.1).
- Turn on the machine using the main switch (see chapter 7.1).
- Check the direction of rotation of the motor. If the direction of rotation does not coincide with the one
shown on the belt guard, turn off the machine and invert the two phases on the main power supply
(see chapter 7.2).
- Check the operation of the safety valve (see chapter 9.1).
- Check for wear on the cylinders to be filled (see chapter 9.1).
- Set the pressure switch on the control panel to the refill pressure value given on the cylinder
(see chapter 8.1).
- Fit the hose attachment on the cylinder and check that the taps on the hose are open
(see chapter 9.2).
- Turn on the cylinder tap and start up the compressor (see chapter 9.2).
- When the filling operation has been completed, the compressor is stopped automatically by the
pressure switch, turn off the cylinder and the hose taps.
- Press the pressure bleed button and disconnect the cylinder attachment (see chapter 9.2).
USE IN BRIEFUSE IN BRIEF
USE IN BRIEFUSE IN BRIEF
USE IN BRIEF
Use in brief

8
GUGU
GUGU
GUARANTEEARANTEE
ARANTEEARANTEE
ARANTEE ANDAND
ANDAND
AND ASSISTASSIST
ASSISTASSIST
ASSISTANCEANCE
ANCEANCE
ANCE
AEROTECNICA COLTRI S.r.l. guarantees its compressors against any design or manufacturing defect
or fault and against any fault in the materials for a period of twelve months from the delivery of the
machine. The customer must inform AEROTECNICA COLTRI S.r.l. in writing of any fault and/or defect
that may be found within eight days from its discovery by means of a registered letter with advice of
receipt or telegramme, otherwise the guarantee will become null and void.
The guarantee is only valid against faults or defects that may arise with the compressor used under
proper operating conditions according to the instructions given in this manual and with the maintenance
carried out at the intervals as provided for.
The guarantee expressly excludes any faults arising as a result of improper use of the machine, of
atmospheric agents and of damage due to transport; the guarantee does not cover the expendable
materials and materials required for the periodic maintenance which are at the customer’s entire
expense. The guarantee will, in any case, become automatically null and void if the compressor is
tampered with or if it has been serviced by technicians who are not authorized to do so by
AEROTECNICA COLTRI S.r.l.
Any compressor that is acknowledged to be faulty due to defects in the design, manufacturing or materials
used, will be repaired or replaced free of charge by AEROTECNICA COLTRI S.r.l. at its factory in San
Martino della Battaglia (BRESCIA). The customer will be responsible for the costs of transport and
carriage as well as for any spare parts and expendable materials.
If it should be necessary for service to be carried out under the guarantee at the customer’s premises,
the latter will be responsible for the travel and transfer costs for the staff sent out by
AEROTECNICA COLTRI S.r.l.
Taking delivery of the machine and/or of any faulty components or the transfers for the inspection of
faults and/or defects as notified by the customer, will not, however, denote any implicit acknowledgement
regarding the effectiveness of the guarantee.
Repairs and/or replacements made by AEROTECNICA COLTRI S.r.l. during the guarantee period will
not extend the duration of the same.
Acknowledgment of the guarantee does not itself imply any liability for compensation on the part of
AEROTECNICA COLTRI S.r.l.
AEROTECNICA COLTRI S.r.l. does not assume any responsibility for injury to persons or damage to
property or for any other direct or indirect damage (loss of production or missed profit, etc.) that may be
attributable to faults or defects of the compressor, except for those cases in which a serious fault can be
attributed to the company.
11
11
1
1.11.1
1.11.1
1.1
Guarantee
1.21.2
1.21.2
1.2 AssistanceAssistance
AssistanceAssistance
Assistance
The AEROTECNICA COLTRI S.r.l. technicians are available for any kind of routine or additional
maintenance work.
The request for technical assistance must be sent to AEROTECNICA COLTRI S.r.l. at the following
address:
AEROTECNICA COLTRI S.r.l.
Via Colli Storici, 177
25010 San Martino della Battaglia (BRESCIA) ITALIA
Fax: [phone]
e-mail: [email protected]
Guarantee and assistance

9
This chapter provides a technological description of the machine and its main components.
2.1 Operating principle ........................................................................................................... 10
2.2 Description of the pump unit ............................................................................................ 11
2.2.1 Monobloc unit .......................................................................................................... 12
2.2.2 Head unit .................................................................................................................. 13
2.2.3 Safety valves ............................................................................................................. 13
2.2.4 Lubrication unit ........................................................................................................ 14
2.2.5 Pressure maintenance valve .................................................................................... 14
2.2.6 Cooling pipes ........................................................................................................... 14
2.2.7 Filters ........................................................................................................................ 15
2.2.8 Frame and sound-proofed casing ............................................................................ 16
2.3 Machine control ................................................................................................................ 16
TECHNICAL DESCRIPTIONTECHNICAL DESCRIPTION
TECHNICAL DESCRIPTIONTECHNICAL DESCRIPTION
TECHNICAL DESCRIPTION 22
22
2
Technical description

10
12
The refill stations in the “Compact” series are
of the semi-soundproofed type (model
MCH 13-16/ET) (Fig. 2) (model MCH 26-32/ET)
(Fig. 1).
4
3
The air circulating around the compressor, which does not contain any harmful fumes, is taken into the
intake filter and introduced through the intake valve into the cylinder of the first stage where the first
compression takes place.
A part of the heat produced in the compression is dissipated by the flow of air created by the fan through
the head and relative valves, piston, cylinder, monobloc and lubricating oil; the heat remaining in the
compressed air is dissipated in the long piping connecting one stage of the compression to another and
which acts as a radiator; the temperature at the hose outlet is just a few degrees higher than that of the
environment.
The operating temperatures of each stage are: at the pipe connection that goes to the intake cylinder:
about 15-20 °C above the environmental temperature (it feels warm to the touch), to the pipe connection
that starts from the head (from the discharge valve), about 80-100 °C.
2.12.1
2.12.1
2.1 Operating principleOperating principle
Operating principleOperating principle
Operating principle
Technical description
Model MCH 13-16/ET is fitted with a compressor
(Fig. 4), while model MCH 26-32/ET is provided
with two compressors (Fig. 3), which enable the
latter to refill up to four cylinders at the same time
(in the standard version).
All the compressors fitted inside the refill stations
are of the high pressure type with forced air cooling
and 3 stages of compression.

11
The pumping unit has the task of producing compressed air at high pressure (200-300 bar) and purifying
it by means of the decantation and filtering systems until it reaches a level of purity equal to or higher
than the limits set by the standards DIN 3188 - UNI EN 132 - CGA/E, or to increase the pressure of the
gas inhaled (only inert - non-explosive gases).
This unit consists of the following components (Fig. 5-6):
5
The intake air contains a certain degree of humidity according to atmospheric conditions. During the
compression and subsequent cooling, the humidity condenses and together with the particles of lubricating
oil forms a milky white emulsion that precipitates into the separators.
The compression diagram is included in chapter 13.
6
Technical description
2.22.2
2.22.2
2.2
Description of the pump unitDescription of the pump unit
Description of the pump unitDescription of the pump unit
Description of the pump unit
N° Description N° Description
1Intake filter 12 2nd stage safety valve
21st stage head 13 Monobloc
32nd stage head 14 Filter-holding bracket
43rd stage head 15 Fan
51st stage cylinder 16 Oil cap
62nd stage cylinder 17 Final condensate separator
73rd stage guiding cylinder 18 Condensate separator between stages
81st-2nd stage cooling pipe 19 Condensate discharge connection
92nd-3rd stage cooling pipe 20 Maintenance valve
10 Final cooling pipe 21 Pipe-fastening bracket
11 1st stage safety valve 22 3rd stage or final safety valve
Table 1

12
The cylinders are made of cast iron (Fig. 9), while
the pistons are made of aluminium and have
traditional multiple compression rings. The high
pressure stage piston has an anti-wear coating.
The relative cylinder is given a self-lubricating
treatment.
9
7
8
Technical description
2.2.12.2.1
2.2.12.2.1
2.2.1 Monobloc unitMonobloc unit
Monobloc unitMonobloc unit
Monobloc unit
The gooseneck, the pistons and the cylinders
also form a part of this unit.
The monobloc (Fig. 7) is made of aluminium
alloy, the two flanges with the ball and roller
bearings that support the gooseneck are oil-
tight with the monobloc due to the O-Rings
fitted.
The gooseneck and the connecting rods only
turn on roller or ball bearings (Fig. 8).
The three connecting rods are fitted on the
gooseneck with a single crank angle.

13
10
Technical description
The head unit includes the discharge and intake
valves.
The head of the 1st stage is of a lamellar type and
includes both the intake and the discharge.
The intake and discharge valves are located directly
in their threaded seats of the heads of the 2nd and
3rd stages. The intake valves can be removed using
the special pin wrench (cod. SC000480), having
first removed the heads.
The discharge valves can be removed from the
outside.
See Chapter 11, “Maintenance”.
The purpose of the safety valves (see figure 5) is to protect the machine (and the cylinders) from
overpressure.
These valves are pre-calibrated in the factory at the following pressures:
- safety valve for 1st stage: 8 bar;
- safety valve for 2nd stage: 50 bar;
- safety or final valve for 3rd stage: 225 bar - or 330 bar.
WARNING
Under no circumstances may these valves be altered to increase the calibrated pressure.
If these valves should come into operation, check the cause that has led to the maximum pressure and
take steps according to the instructions given in paragraph 12.1.
Any tampering with the safety valves causes serious damage and an immediate cancellation of the
guarantee.
2.2.22.2.2
2.2.22.2.2
2.2.2
Head unit (Fig. 10)Head unit (Fig. 10)
Head unit (Fig. 10)Head unit (Fig. 10)
Head unit (Fig. 10)
2.2.32.2.3
2.2.32.2.3
2.2.3
Safety valvesSafety valves
Safety valvesSafety valves
Safety valves

14
12
2.2.42.2.4
2.2.42.2.4
2.2.4
11
Technical description
Lubricating unitLubricating unit
Lubricating unitLubricating unit
Lubricating unit
2.2.62.2.6
2.2.62.2.6
2.2.6 Cooling pipes (Fig. 12)Cooling pipes (Fig. 12)
Cooling pipes (Fig. 12)Cooling pipes (Fig. 12)
Cooling pipes (Fig. 12)
The cooling pipes between the 1st and 2nd stage,
between the 2nd and 3rd stage and after the 3rd stage
are made of stainless steel, like those for the
passage of air between the separator and the filter.
This valve is fitted after the final filter. Just a few seconds after the compressor has been started up, it
keeps the pressure of the entire system at 100 ± 20 bar (see exploded view Chapter 14), for the purpose
of eliminating as much water as possible from the air. It also acts as a non-return valve.
2.2.52.2.5
2.2.52.2.5
2.2.5 Pressure maintenance valvePressure maintenance valve
Pressure maintenance valvePressure maintenance valve
Pressure maintenance valve
Lubrication is carried out by means of a tang
screwed into the end part of the connecting rods of
the 2nd and 3rd stages (Fig. 11).
The 3rd high pressure stage is lubricated by oil
vapours.

15
14
13
Technical description
ACTIVE CARBON AND MOLECULAR SIEVE FILTER (Fig. 14)
For model MCH 13-16/ET, the filter is housed inside
the compressor covering panel, while for model
MCH 26-32/ET there are two active carbon filters
both of which are located on the outside of the
compressor on the front panel.
The filter consists of an aluminium tube (B) that
holds the filter cartridge (A).
The shell of the cartridge contains the active carbon
(C) and the molecular sieve (D) placed between
felt disks.
The condition of the cartridge is of fundamental
importance for the quality of the air (see paragraph
11.7 for replacement instructions).
2.2.72.2.7
2.2.72.2.7
2.2.7
FiltersFilters
FiltersFilters
Filters
INTAKE FILTER (Fig. 13)
The suction filter is coupled directly to the lid of
the 1st stage head.
The intake filter consists of a cylindrical aluminium
casing provided with a screw cap that holds the
filtering cartridge.
A special attachment is provided on the filter for
the connection of an extension (optional) which
enables air to be taken from the outside when the
compressor is installed in a place without ideal
ventilation.
For the compressor to operate properly, the filter
maintenance must be carried out as provided for
and at the intervals recommended (instructions in
paragraph 11.6).

16
16
15
The compressor and the electric motor are fitted
on a welded steel frame coated in epoxy resins
and are enclosed within a sound-proofed casing
covered in sound-deadening, water-repellent and
fireproof panels.
The excellent way in which the flow of the cooling
air has been designed enables the temperature
inside to be just slightly higher than the outside
temperature.
MCH 13-16/ET FRAME
MCH 26-32/ET FRAME
2.32.3
2.32.3
2.3 Machine controlMachine control
Machine controlMachine control
Machine control
17
MCH 13-16/ET
The machine function controls are located on an
electric control panel (Fig. 17).
Apart from the various control buttons, this panel
also includes an hour counter that enables the
number of machine operating hours to be
memorized.
Technical description
2.2.82.2.8
2.2.82.2.8
2.2.8 FF
FF
F
rr
rr
rame and sound-prame and sound-pr
ame and sound-prame and sound-pr
ame and sound-proofoof
oofoof
oofed casing (Figed casing (Fig
ed casing (Figed casing (Fig
ed casing (Fig..
..
.15-16)15-16)
15-16)15-16)
15-16)

17
MCH 26-32/ET
This model also has the same control buttons as
for model MCH 13-16/ET.
For model MCH 26-32/ET, the same controls are
doubled up on two independent control panels
(Fig. 18) which each control one of the two pump
units present inside the refill station.
18
Technical description

18
This chapter provides some technical information concerning the machine.
3.1 Technical characteristics of the pump unit ....................................................................... 18
3.1.1 Machine series MCH 13-16-26-32/ET ......................................................................... 18
3.1.2 Sizes and weights ..................................................................................................... 19
3.2 Noise ................................................................................................................................... 19
The pump unit consists of: three compression stages, three cylinders, forced air cooling by means of a
large diameter fan, splash lubrication with immersed tangs, stainless steel cooling pipes.
TECHNICAL CHARACTERISTICTECHNICAL CHARACTERISTIC
TECHNICAL CHARACTERISTICTECHNICAL CHARACTERISTIC
TECHNICAL CHARACTERISTIC
33
33
3
3.13.1
3.13.1
3.1
TT
TT
Tecec
ecec
echnical chnical c
hnical chnical c
hnical charhar
harhar
haracteristics ofacteristics of
acteristics ofacteristics of
acteristics of the pump unitthe pump unit
the pump unitthe pump unit
the pump unit
3.1.13.1.1
3.1.13.1.1
3.1.1 Machine series MCH 13-16-26-32/ETMachine series MCH 13-16-26-32/ET
Machine series MCH 13-16-26-32/ETMachine series MCH 13-16-26-32/ET
Machine series MCH 13-16-26-32/ET
MCH 13/ET MCH 16ET MCH 26/ET MCH 32/ET
Max. non-continuous peak
pressure
225 o 330 bar - 3200 o 4700 psi
Max. non-continuous working
pressure
Capacity approx. 210 lt/min 13 m3/h approx. 260 lt/min 16 m3/h approx. 420 lt/min 26 m3/h approx. 520 lt/min 32 m3/h
Cylinder diameter 88/36/14 mm 95/38/14 mm 88/36/14 mm 95/38/14 mm
Speed of rotation 1350 r.p.m. 1550 r.p.m. 1350 r.p.m. 1550 r.p.m.
Piston stroke 40 mm
Intermediate pressures
1st stage
2nd stage
3rd stage
5 bar/70 psig
40 bar/570 psig
225-330 bar/3200-4700 psig
1st stage
2nd stage
3rd stage
5 bar/70 psig
40 bar/570 psig
225-330 bar/3200-4800 psig
Power motor 4Kw-5,5HP 5,5Kw-7,5HP 2x 4Kw-5,5HP 2x 5,5Kw-7,5HP
Tension and frequency
(three-phase)
400V - 50Hz
440V - 60Hz
230V - 50Hz
230V - 60Hz
Table 1
Technical characteristics

19
3.1.23.1.2
3.1.23.1.2
3.1.2
Sizes and weights (Fig. 18-19)Sizes and weights (Fig. 18-19)
Sizes and weights (Fig. 18-19)Sizes and weights (Fig. 18-19)
Sizes and weights (Fig. 18-19)
MODEL A (mm) B (mm) C (mm) Weight (Kg.)
MCH 13/ET Compact 890 600 840 141
MCH 16/ET Compact 890 600 840 151
MCH 26/ET Compact 890 850 1330 286
MCH 32/ET Compact 890 850 1330 306
3.23.2
3.23.2
3.2
NoiseNoise
NoiseNoise
Noise
The Compact series of compressors have been designed and built with the objective of reducing acoutsic
pressure to a minimum.
MCH 13-16/ET COMPACT MCH 26-32/ET COMPACT
18 19
Table 2
Technical characteristics

20 Technical characteristics
Whenever the machines are used for work in environments where the daily noise level to which the
operators are exposed is higher than 80 dBA, the employer must take steps to apply all the measurements
necessary to safeguard the operator’s health. In particular, the operators must, if necessary, use all the
individual protection devices to protect themselves from the noise level.
The reading of the machine noise level was taken
from the “operator’s work place” (Fig. 20), with the
following methods and results:
20
METHODS OF MEASUREMENT
ISO 3746
MCH 13/ET Compact MCH 16/ET Compact MCH 26/ET Compact MCH 32/ET Compact
Level of acoustic pressure at the operator’s work place
Level of acoustic power
Peak level
dB(A) 79,4
dB(A) 91,5
-
dB(A) 81
dB(A) 94,5
-
dB(A) 72,4
dB(A) 92,7
-
dB(A) 75
dB(A) 97,1
-
INSTRUMENTS
Bruel & Kjacr sound level integrating meter
Microphone for sound level meter
Gauge
Mod. 2231 cl. 1
Mod. 4155 cl. 1
Mod. 4230 cl. 2
Table 3