ME.ST.EL Mask Information & Manuals

SPECIFICATIONS

1. INTEGRAL FACE-PIECE

General features

This stiff, transparent structure is the actual supporting body of the SGE 400 protective mask. Its task is to take place of the rubber bodies previously employed by traditional designs to bear the weight to which the mask is subjected. This unit supports the head harness, valves, filters, regulators, etc.

The advantages of this innovation are:

• a substantially reduced mask weight

• a better field of vision (practically the whole mask is transparent)

• the weight is held by a rigid structure, unlike the traditional rubber body which is flexible

• protection of the face is guaranteed by the impact and cut resistant structure

• for the above reasons and the consequent lack of discomfort due to limitation of field of vision, the mask fits comfortably which increases the amount of time a person can wear it

• the wearer can be easily identified due to the total transparency of the face- piece, helping to normalize conditions and maintain discipline

The main part of the face-piece, which consists of a large round surface in front of the eyes, is set back in the structure, thus keeping the overall dimensions to a minimum, reducing the risk of scratching and allowing the use of optical instruments so often used in today’s armed forces. The material used is a specially coated polycarbonate (SGE 400; SGE 400/3; SGE 400/3 BB only), which transmits no less than 90% of available light while absorbing U.V. rays.

Mechanical features

In the SGE masks, the entire bodies of the masks are made of a strong, rigid material (polycarbonate) and are therefore able to allow full protection for the face and eyes against extremely violent impacts. Laboratory tests have been carried out proving that the polycarbonate body is left unharmed by a 6.35 caliber bullet hitting it at a speed of more than 150 m/seconds. This means that the whole face is given the same protection afforded by the protective helmet.

Resistance to chemical agents

Treatment of the outer surfaces (SGE 400; SGE 400/3; SGE 400/3 BB only) makes the polycarbonate resistant to aggressive substances. Samples of the treated material have been subjected to mustard gas penetration tests. After over 50 hours, mustard gas failed to penetrate through the tested specimens.

The treated face-piece may also be decontaminated an unlimited number of times without deterioration, using all the normal decontamination methods including immersion in boiling water.

Material used

Face-piece: Transparent polycarbonate

Treatment (SGE 400; SGE 400/3; SGE 400/3 BB only): Polysiloxane resin

2. FACE-SEAL

Due to the use of an integral load-bearing face-piece, it was possible to make the rubber face-seal much lighter, as its only function is to act as a seal. Traditional masks consist basically of a load-bearing rubber structure fitted with two sealed eye- pieces, and since the rubber body has to bear the weight of all the accessories attached to the mask it has to be made rigid and thick (heavy and uncomfortable) and will therefore not adhere comfortably to the wearer’s face. Our face-seal, on the other hand, is made of very soft rubber with a supple bellows type structure which allows perfect sealing and a very high degree of comfort even after very prolonged use. The bellows type structure also allows it to adjust easily to all face shapes, so that it is no longer necessary to stock large numbers of different sizes of masks, many of which will go unused. The face-seal has a seat into which the edge of the load- bearing face-piece is inserted, and the coupling of these two parts is ensured by the fixing rim. As a whole, the straps, face-seal and stiff body of the mask together provide far more comfort than traditional masks. In the case of traditional flexible rubber bodies, the tensile stresses exerted by the ends of the straps are discharged only on the points where these join the body. In order to obtain uniform sealing all around the edge of the mask, it is therefore necessary to pull the straps very tight. Naturally, this situation is one of the greatest causes of discomfort when using traditional masks. The stiff body of the SGE means the effort applied by the straps is distributed evenly and perfectly all around the edges of the mask so it is not necessary to tighten the straps excessively and uncomfortably.

Materials

Platinum—catalyzed grade silicone rubber.

3. FILTER FITTINGS

The SGE masks have a threaded fitting for application of standard filters (DIN 3183, UNI 7246). The fitting is contained in a single unit which also comprises the exhalation valve. The shape of the internal ring nut allows perfect ventilation of the whole face-piece, preventing misting even at low temperatures.

Mechanical characteristics The material used is black polyarilamide, created for aeronautical and aerospace requirements. In addition to a very high impact resistance, it is not affected by aging or atmospheric factors. Its abrasion resistance is such that after testing with over 3000 assembly/disassembly operations, the filter had sustained no wear.

Material used

Technopolymer parts: Polyarilamide reinforced with mineral charges Membrane: Polyisoprene mixture

4. EXHALATION VALVE

As already seen, the exhalation valve is fitted onto the same unit containing the filter fitting. Externally the valve has a structure which, although it covers the whole membrane, still allows easy discharging of the exhaled air. The purpose of this covering structure is to keep a sufficient volume of uncontaminated air in continuous contact with the membrane.

5. SPEECH DIAPHRAGM (Optional)

The speech diaphragm coincides with the exhalation membrane.

6. MEMBRANES

The exhalation membrane has been made to require minimum effort even at very high flow rates. The excellent memory of the membranes has been achieved by a combination of good design and high grade material. Using blends containing butyl rubbers instead of the traditional natural rubber used by other manufacturers, causing a considerable increase in resistance to chemical agents, has been achieved.

7. ORAL-NASAL UNIT

The design of this component is critical to the effectiveness and comfort of the mask. Because it comes in direct contact with particularly sensitive areas of the face, the correct choice of shape and material was vital. The oral-nasal area of our mask is made of soft medical grade silicone rubber, designed specifically for use in contact with the human body for indefinite periods of time without causing irritation or allergic reactions of any kind. The shape is designed to provide optimum comfort and efficiency; the U shaped

peripheral lip performs the following important functions:

• it adheres softly and evenly to the face, following its contours perfectly

• it has a sufficiently rigid structure to ensure effective sealing during inhalation

• it is sufficiently soft to open and swells under the slight pressure caused by exhalation, isolating the nose and mouth area perfectly from the rest of the mask

Breathing valve system

Two very light inhalation valves are attached laterally to the oral-nasal unit, the lower part of which is connected to the auxiliary drainage valve. The front part of the oral-nasal unit is attached into the exhalation/speech/feeding valve unit. This union is obtained by using the rubber’s elasticity, guaranteeing perfect sealing, and in addition allows for the easy removal of the oral-nasal unit (for replacement or cleaning purposes) by hand without the need for any tools.

Materials

Membrane: Polysoprene

Oral-nasal unit: Platinum-catalyzed medical grade silicone rubber

8. FIXING RIM AND STRAP

The fixing rim has the role of connecting the straps to the frame of the mask and at the same time fixing and locking the face-seal and the incorporated hood, if used. Once the rim is tightened in place by means of the special screw, it fits into a special seat in the frame of the mask. In this way, the pull exerted on the fixing points of the head harness is transferred and distributed evenly around the whole circumference of the mask, allowing perfect adjustment of its tightness for maximum comfort and optimum sealing on the face of the wearer. It should be pointed out that this is not possible with the traditional mask, as the pull exerted by the strap itself is secured, thus requiring the wearer to over-tighten the mask, drastically reducing the level of comfort. Materials: Rim: Polyamide 11 Head-strap: Nitril

9. CLEANING AND DECONTAMINATION

The mask design makes decontamination and cleaning easier. In fact, even when rubber is made of mixtures capable of providing a chemical shield, its structure does absorb and is penetrated by the contaminants. The SGE masks are made of two main parts: face shield and face seal. So the majority of the mask is made of plastic materials which are not permeable to aggressive agents, and are not penetrated by them in the least even after very long exposure times. It is advisable to clean the mask each time after use. This is easily accomplished by washing with soap and water. Hot water can also be used. The mask can be disinfected using non-aggressive disinfectants or by immersing it briefly in boiling water. At least once a year the inhalation and exhalation membranes must be checked, as well as the sealing gasket of the fitting on the mask.

Credentials

ME.ST.EL Safety understands the importance of testing and certifying products. Therefore, over the years, ME.ST.EL Safety has undergone many certification processes and testing. The following are some of the certifications and countries that the ME.ST.EL Safety Gas Masks have been certified in:

1. Certification ISO 9001-2000

2. University of Genoa Certification

3. Spain (Centro Nacional de Medios de Protection, Certificate of Approval No. 3082)

4. Denmark (Societa Generale Elastomeri S. p. A., Arbejdstilsynet)

5. Australia (Work Cover Authority, Certificate of Approval No. 1778)

6. England (Health and Safety Executive, Certificate of Approval, CA/156/89)

7. CE Certification for category III in terms of European 89/686/CEE, in conformity with the harmonized EN 136:1998 CL3

8. U.K., Germany, Denmark, HSE, DIN, EN 136

9. NATO ID number A-8515

1 - INTRODUCTION

The SGE full-face mask conforms to European standard EN-136. Only screw filters are used, conforming to European standard EN-148 part 1.

2 - APPROVAL

The full face mask, model SGE 150 is a Personal Protective Device that falls under category III in terms of European 89/686/CEE (Leg. Dec. 4.12.92, N° 475). The masks carry a CE certification in conformity with the harmonised EN 136: 1998 standard and satisfy the requirements laid down for class 3.

Marking

An example of the marking used is given below:

CE 0426

SGE 150 EN 136: 1998 CL3

Where SGE 150 indicated the model, EN 136: 1998 indicates the European reference standard and CL

3 indicates the class the device belongs to in terms of the reference standard. The CE conformity mark indicates that the essential health and safety requirements indicated in Attachment 2 to the European Decree 89/686/CEE (Leg. Dec. 4.12.92 N° 475) are fulfilled. The number alongside the conformity mark denotes the Certified Body, ITALCERT, responsible for checking production in terms of article 11. B, European Directive 89/686/CEE. EN 136, EN 148, European 89/686/CEE

3 - APPLICATIONS

The mask can be used in conditions requiring protection for both eyes and respiratory system. It is particularly recommended for industrial and agricultural sectors where the air is contaminated by toxic and/or hazardous substances.

The SGE 150 full-face mask cannot be connected to SGE 2400 or SGE 2500 filtering fans (with acoustic alarm) as it is not designed for this purpose. For applications with filtering fans, the SGE 400 should be used, which is an integral part of the device and therefore conforms to European standard EN-147.

4 - DESCRIPTION

The SGE 150 full-face mask is fitted by means of a headpiece with 6 straps. These can be adjusted to ensure a perfect fit over the face. The internal nose and mouthpiece allow the air inhaled to pass through the visor without causing condensation or misting. It also reduces unused space inside the mask to prevent the build-up of carbon dioxide from the air exhaled.

CBRN Requirements

In 2003, a new certification (CBRN) was introduced for safety products in the United States. To find out more information about the new CBRN requirements and testing, visit the internet site, www.ready.gov or call the toll-free number 1-800-BE-READY. The website will give information on what to know in deciding whether to buy escape hoods, gas masks, or other respirators for preparedness at home and work, as well as specific details of the CBRN requirements and testing. The purpose of the CBRN testing is to ensure that CBRN SCBA have (1) good face-fitting characteristics that can accommodate a wide variety of facial sizes and shapes, and (2) instructions for face- piece size selection and donning that are easily understood, easily followed, and effective. Furthermore, each CBRN SCBA respirator is evaluated on a panel of 25-40 test subjects having facial sizes and shapes that approximate the distribution of sizes and shapes of the general population. The website will also give information on the tests performed and how the test results are analyzed.

INSTRUCTIONS FOR USE AND MAINTENANCE OF THE SGE 150 FULL FACE MASK

PREFACE

These instructions for the SGE 150 full face mask have been prepared by MESTEL Safety.

The SGE 150 must be used and maintained in accordance with the following instructions. Incorrect use, use of unsuitable spare parts or bad maintenance are not only dangerous for health and safety but also automatically invalidate the guarantee and exempt MESTEL Safety from all liability.

1 - INTRODUCTION

The SGE full-face mask conforms to European standard EN-136. Only screw filters can be used, conforming to European standard EN-148 part 1.

2 - APPROVAL

The full face mask, model SGE 150 is Personal Protective Equipment that fall under category III in terms of European 89/686/CEE (Italian Leg. Dec. 4.12.92, N° 475). The masks carry a CE certification in conformity with the harmonised EN 136: 1998 standard and satisfy the requirements laid down for class 3. (Firefighting & special use). -Marking An example of the marking used is given below: CE 0426 SGE 150 EN 136: 1998 CL3 Where SGE 150 indicated the model, EN 136: 1998 indicates the European reference standard and CL 3 indicates the class the device belongs to, in terms of the reference standard. The CE conformity mark indicates that the essential health and safety requirements indicated in Attachment 2 to the European Directive 89/686/CEE (Leg. Dec. 4.12.92 N° 475) are fulfilled. The number alongside the conformity mark denotes the Certified Body, ITALCERT, responsible for checking production in terms of article 11. B, European Directive 89/686/CEE.

3 - APPLICATIONS

The mask can be used in conditions requiring protection for both eyes and respiratory system. It is particularly recommended for industrial and agricultural sectors where the air is contaminated by toxic and/or hazardous substances.

4 - RESTRICTIONS

This ppe doesn’t provide oxygen, be careful to use it exclusively where O> 13%

5 - DESCRIPTION

The SGE 150 full face mask is fitted by means of a headpiece with six straps. These can be adjusted to ensure a perfect fit over the face. The internal nose and mouth piece allow the air inhaled to pass through the visor without causing condensation or misting. It also reduces unused space inside the mask to prevent the build-up of carbon dioxide from the air exhaled.

6 - MARKINGS ON PARTS

6.1 Visor

The visor is engraved to one side with the characters M-1

6.2 Clamping band

GE 150 is marked on the clip in the area between the two upper ends of the strap. It is also marked CE 0426. and EN 136: 1998 CL.3

6.3 Face seal

The face seal is marked internally with the characters N-6 A or N-6 AS.

6.4 Head piece and straps

The head piece and straps are marked centrally with “Made in Italy by Me.st.el.”

6.5 Other parts

All other parts of the SGE 150 full face mask are marked for easy identification to aid replacement during maintenance checks and to trace manufacturing data.

7 - INSTRUCTIONS FOR USE

7.1 General information

7.1.1 Packing

When removing the mask from its box, check that the instructions are included and that the mask shows no signs of damage. If it does, contact your supplier immediately.

7.1.2 Storage

Store the mask in a dry place away from direct sunlight and other sources of heat. Do not store below -20° C or above +50° C.

7.2 Preparation for use

7.2.1 Initial check

First read instructions carefully

1 - Inspect mask thoroughly

2 - Check visor is clean

3 - Check breathing valve is clean and moves freely

4 - Ensure that straps are fully extended

7.2.2 Fitting the mask

1 - Put the chin into the face seal, keeping the two lower straps stretched open with the hands.

2 - Now pull the mask over the head and adjust it on the face. Be sure that hair does not remain trapped between seal and forehead.

3 - Adjust the side straps, then the lower straps and finally the upper ones. Do not tighten straps too much.

4 - Use the palm of the hand to cover the threaded hole into which the filter is screwed and inhale. The mask should collapse in towards the face and remain so for as long as you hold your breath. This check is necessary to ensure that the face seal is fitted correctly. If it is not, tighten the straps or adjust the mask over the face. Then repeat the check until the fit is perfect.

IMPORTANT

Beards, long sideburns or spectacle stems may interfere with adhesion of the mask to the face and cause air to escape. Do not use in such circumstances.

7.3 Use

Choose the filter according to the type of contaminant, check the expiration date and ensure that the seal at the bottom of the threaded hole makes good contact. You may now enter the contaminated area.

7.4 Removing the mask

When you have finished work, remove the mask by loosening the lower straps on the headpiece and pulling it off from the chin upwards.

7.4.1 Cleaning

IMPORTANT

Take particular care of any contaminants deposited on the mask. All cleaning should take place in safe areas. Do not use abrasive substances to clean the visor.

1 - After removing mask, clean under running water with mild soap to remove most of the contaminants. Then, if it is requested, clean more fully by placing in boiling water. If disinfection is required, use a solution of diluted chlorhexidine digluconate (5%).

2 - Dry the mask with a soft, clean cloth or with a cool air blower.

3 - When dry, clean the visor with clean cotton towel.

8 MAINTENANCE

8.1 Monthly check

Examine the mask and check that:

1 - none of the plastic parts are broken

2 - there are no general signs of wear or damage

3 - the seals and/or headpiece are not split

4 - the filters and/or O-rings are not excessively worn

If the mask has any of these defects, it must not be used before the faulty parts are replaced. ME.ST.EL. Srl reccommends using the mask for no more than 10 years before replacement.

8.2 Replacing nose and mouth membrane

To replace the nose and mouth membrane and perform a complete overhaul, first remove the nose and mouth piece from the mask using the spanners provided in maintenance kit K11 (code 033450). If a complete overhaul is not necessary, remove the membrane gently without dismantling the entire nose and mouth assembly and insert the new one.

8.3 Replacing inhaler and exhaler membranes

This maintenance operation requires you to dismantle the entire breathing assembly. This can only be performed using the special spanners provided.

Step 1: insert the metal pin of the circular spanner in the hole on the outside of bushing MI-3 (1) see illustration on page 7 (exploded diagram) and unscrew by turning clockwise. This allows you to replace O-ring MI-8 (2) if it is damaged. Step 2: remove the bushing and pull the breathing assembly out of the mask. This facilitates replacement of the nose and mouth membranes and separation of the assembly into two parts by extracting the central part of filter connector MI-2 (7) from breathing assembly MI-1 (11). During this operation, remove the two O-rings (MI-7 - 6-8 in figure) and replace them if they show signs of wear or breakage. Step 3: replace exhaler filter NG-11 (10) in assembly MI-1. Step 4: use a small pair of long-nosed pliers to remove filter holder MI-4 (4) from assembly MI-2. This operation also involves removing filter seal NG-13 (3) and replacing it if necessary. Replace inhaler membrane MI-5, which is similar to the ones fitted to the nose and mouth piece (5-13). Step 5: reassemble the parts in the reverse order, taking care when fitting the O-rings. Use a thin layer of silicone grease to lubricate the O-rings.

8.4 Replacing the visor

To replace the visor, first detach the mask from the headpiece by unscrewing bolt NG-23 (18) from nut NG-24 (19) with a Philips screwdriver. Remove plastic clamping band MI-9 (20) attached to the headpiece and face seal N-6A (16) from the visor. You can now dismantle the entire breathing assembly using the circular spanner supplied with maintenance kit K-11. Follow the reverse procedure to reassemble the parts, taking care to position the face seal and plastic clamping band correctly.

8.5 Replacing headpiece

The headpiece has 6 adjuster straps (M-8 - 17 in figure). Replace if there is any sign of splitting. To do this, pull the straps out through buckles MI-6 (22). Once you have freed all of the straps, install the new headpiece by passing the straps through the buckles and making sure they are fitted securely.

8.6 Replacing clamping band

If clamping band MI-9 (20) is accidentally broken, remove it from the straps and buckles (see above). Then use a Philips screwdriver to unscrew the bolt from the nut and open the clip. When reassembling, be particularly careful that the face seal and clamping band are centered on the visor. Do this by lining up one end with the center mark on the face seal before tightening the bolt.

INSTRUCTIONS FOR USE AND MAINTENANCE OF THE SGE 400 FULL FACE MASK

1 - INTRODUCTION The SGE 400 full face mask conforms to European standard EN-136. Only screw filters are used, conforming to European standard EN-148 part 1.

2 - APPROVAL The full face mask, model SGE 150 is a Personal Protective Equipment that fall under category III in terms of European 89/686/CEE (Italian Leg. Dec. 4.12.92, N° 475). The masks carry a CE certification in conformity with the harmonised EN 136: 1998 standard and satisfy the requirements laid down for class 3. (Firefighting & special use).

Marking

An example of the marking used is given below:

CE 0426

SGE 150 EN 136: 1998 CL3

Where SGE 150 indicated the model, EN 136: 1998 indicates the European reference standard and CL 3 indicates the class the device belongs to, in terms of the reference standard. The CE conformity mark indicates that the essential health and safety requirements indicated in Attachment 2 to the European Directive 89/686/CEE (Leg. Dec. 4.12.92 N° 475) are fulfilled. The number alongside the conformity mark denotes the Certified Body, ITALCERT, responsible for checking production in terms of article 11. B, European Directive 89/686/CEE.

3 - APPLICATIONS The mask can be used in conditions requiring protection for both eyes and respiratory system. It is particularly recommended for industrial and agricultural sectors where the air is contaminated by toxic and/or hazardous substances.

4 - RESTRICTIONS This ppe doesn’t provide oxygen, be carefull to use it exclusively where O2> 13%

5 - DESCRIPTION The SGE 400 full-face mask is fitted by means of a headpiece with six straps. These can be adjusted to ensure a perfect fit over the face. The internal nose and mouth piece allow the air inhaled to pass through the visor without causing condensation or misting. It also reduces the unused space inside the mask to prevent the build-up of carbon dioxide from the air exhaled.

6 - MARKINGS ON PARTS

6.1 Visor The visor is engraved to one side with the characters M-1.

6.2 Clamping band One end of the clamping band where it meets the other bears the manufacturing lot number.

6.3 Face seal The face seal is marked internally with the characters N-6 AS or N-6 A.

6.4 Breathing assembly The top of the assembly is clearly marked SGE 400 to identify the type of mask.

6.5 Other parts All other parts of the SGE 400 full-face mask are marked for easy identification to aid replacement during maintenance checks and to trace manufacturing data.

7 - INSTRUCTIONS FOR USE

7.1 General information

7.1.1 Packing

When removing the mask from its box, check that the instructions are included and that the mask shows no signs of damage. If it does, contact your supplier immediately.

7.1.2 Storage

Store the mask in a dry place away from direct sunlight and other sources of heat. Do not store below -20° C or above +50° C.

7.2 Preparation for use

7.2.1 Initial check

First read instructions carefully

1 - Inspect mask thoroughly

2 - Check visor is clean

3 - Check breathing valve is clean and moves freely

4 - Ensure that straps are fully extended

7.2.2 Fitting the mask

1 - Put the neck strap over the head so that the mask hangs around the neck with the inside towards the face.

2 - Put the chin into the face seal, keeping the two lower straps stretched open with the hands.

3 - Now pull the mask over the head and adjust it on the face. Be sure that hair does not remain trapped between seal and forehead.

4 - Adjust the side straps, then the lower straps and finally the upper ones. Do not tighten straps excessively.

5 - Use the palm of the hand to cover the threaded hole into which the filter is screwed and inhale. The mask should collapse in towards the face and remain so for as long as you hold your breath. This check is necessary to ensure that the face seal is fitted correctly. If it is not, tighten the straps or adjust the mask over the face. Then repeat the check until the fit is perfect.

IMPORTANT

Beards, long sideburns or spectacle stems may interfere with the fitting of the mask to the face and cause air to leakage. Do not use in such circumstances.

7.3 Use Choose the filter according to the type of contaminant, check the expiration date and ensure that the seal at the bottom of the threaded hole makes good contact. You can now enter the contaminated area.

7.4 Removing the mask Remove the mask either by pulling the two ends of the neck strap or by loosening the two lower headpiece straps. Then pull the mask off from the chin upwards.

7.4.1 Cleaning

IMPORTANT

Take particular care of any contaminants deposited on the mask. All cleaning should take place in safe areas. Do not use abrasive substances to clean the visor.

1 - After removing mask, clean under running water with mild soap to remove most of the contaminants. Then clean more fully by placing in boiling water. If disinfection is required, use a solution of diluted chlorhexidine digluconate (5%).

2 - Dry the mask with a soft, clean cloth or with a cool air blower.

3 - When dry, clean the visor with clean cotton wool.

8-MAINTENANCE

8.1 Monthly check Examine the mask and check that:

1 - none of the plastic parts are broken

2 - there are no general signs of wear or damage

3 - the seals and/or headpiece are not split

4 - the filters and/or O-rings are not excessively worn If the mask has any of these defects, it must not be used before the faulty parts are replaced. ME.ST.EL. Srl reccommends using the mask for no more than 10 years before replacement.

8.2 Replacing nose and mouth membrane To replace the nose and mouth membrane and perform a complete overhaul, first remove the nose and mouth piece from the mask using the spanners provided in maintenance kit K11 (code 033450). If a complete overhaul is not necessary, remove the membrane gently without dismantling the entire nose and mouth assembly and insert the new one. To make the operation easier, apply a little liquid soap to the stem of the new membrane.

8.3 Replacing inhaler and exhaler membranes This maintenance operation requires you to dismantle the entire breathing assembly. This can only be done by using the special spanners provided.

Step 1: insert the metal pin of the circular spanner in the hole on the outside of bushing MI-3 (1) see illustration on page 7 (exploded diagram) and unscrew by turning clockwise. This allows you to replace O-ring MI-8 (2) if it is damaged.

Step 2: remove the bushing and pull the breathing assembly out of the mask. This facilitates replacement of the nose and mouth membranes and separation of the assembly into two parts by extracting the central part of filter connector MI-2 (7) from breathing assembly MI-1 (14). During this operation, remove the two O-rings (MI-7 - 6-8 in figure) and replace them if they show signs of wear or breakage.

Step 3: replace exhaler filter NG-11 (13) in assembly MI-1.

Step 4: use a small pair of long-nosed pliers to remove filter holder MI-4 (4) from assembly MI-2. This operation also involves removing filter seal NG-13 (3) and replacing it if necessary. Replace inhaler membrane MI-5, which is similar to the ones fitted to the nose and mouth piece (5-17).

Step 5: reassemble the parts in the reverse order, taking care when fitting the O-rings. Use a thin layer of silicone grease to lubricate the O-rings.

8.4 Replacing the visor To replace the visor, first detach the mask from the headpiece by unscrewing bolt NG-23 (20) from nut NG-24 (21) with a Philips screwdriver. Remove plastic clamping band MI-9 (23) attached to the headpiece and face seal N-6 AS (18) from the visor. You can now dismantle the entire breathing assembly using the circular spanner supplied with maintenance kit K-11. Follow the reverse procedure to reassemble the parts, taking care to position the face seal and plastic clamping band correctly.

8.5 Replacing headpiece The headpiece has 6 adjuster straps (M-8 - 19 in figure). Replace if there is any sign of splitting. To do this, pull the straps out through buckles MI-6 (26). Once you have freed all of the straps, fit the new headpiece by passing the straps through the buckles and making sure they are fitted securely.

8.6 Replacing clamping band If clamping band MI-9 (23) is accidentally broken, remove it from the straps and buckles (see above). Then use a Philips screwdriver to unscrew the bolt from the nut and open the clip. When reassembling, be particularly careful that the face seal and clamping band are centered on the visor and that the clip is positioned correctly on the face seal. Do this by lining up one end with the center mark on the face seal before tightening the bolt.

INSTRUCTIONS FOR USE OF THE SGE 400/3 FULL FACE MASK

PREFACE:

This leaflet is enclosed as an addition to the SGE400 instructions

DESCRIPTION:

The SGE 400/3 full face mask satisfies the requirements of standard UNI-EN 136 and is CE-certified.

The SGE 400/3 mask differs from SGE mask for SGE400 mask because of the three standard threaded connection, conforming to requirements of UNI-EN part 1° for the connection of one filter in the position most comfortable and practical for the task at hand.

The mask is supplied with two threaded plugs for any unused attachments; these have to be tightened against the seal at the bottom of the threaded hole to ensure a perfect seal.

IMPORTANT:

The only differences between the SGE 400/3 and the SGE 400 instructions are the list of spare parts and the exploded diagram.

These modified parts and the diagram are reproduced in the following pages.

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