MSA Air Mask, Pressure Demand Type BEFORE USE 1.    THOUROUGHLY  CHECK  OUT  THIS  APPARATUS  ON  RECEIPT  PRIOR TO USE. 2.  FOR USE ONLY BY QUALIFIED TRAINED PERSONNEL. 3.        CAUTION:    WEAR    IMPERMEABLE    PROTECTIVE    CLOTHING    FOR EXPOSURE  TO  GASES  AND  VAPORS  WHICH  CAN  POISON  BY  SKIN ABSORPTION. WARNING 1.      This   device   may   not   provide   a   satisfactory   face   seal   with   certain physical   characteristics   (such   as   beards   or   gross   sideburns),   as outlined in ANSIZ88.2-1969, resulting in leakage in connection with the facepiece,  which  voids  or  limits  the  protection.    If  such  a  condition exists,   the   user   assumes   all   risks   of   death   or   serious   bodily   injury which may possibly result. 2.        Under    no    circumstances    should    this    apparatus    be    used    as    an underwater device. 3.    Never  use  any  lubricant  on  any  part  of  the  apparatus  and  always  keep parts entirely free from oil and grease. INSTRUCTIONS FOR USE AND MAINTENANCE The MSA® Pressure Demand Air Mask provides complete respiratory protection and  is  approved  by  the  Mine  Safety  and  Health  Administration  (MSHA)  and  National Institute  for  Occupational  Safety  and  Health  (NIOSH)  as  a  "1/2-hour  duration"  unit. This apparatus can be used at temperatures down to -25 F-, however a nosecup must be  used  at  temperatures  below  +32F.    The  Air  Mask  also  provides  an  Audi-Larm Signal  which  automatically  cocks  when  the  cylinder  valve  is  opened.    Its  loud  clear warning  signal  indicates  it  is  time  to  return  to  fresh  air.    There  is  approximately  6 minutes  breathing  supply  left.    See  "Service  Life"  statement  for  factors  which  affect service  life.    The  Pressure  Demand  Regulator  is  spring  loaded  to  provide  a  positive pressure in the facepiece during inhalation and prevent possible inward leakage. The  warranties  made  by  MSA  with  respect  to  this  product  are  voided  if  the product is not used and serviced (maintained) in accordance with these "instructions for use and maintenance." PREPARATIONI FOR USE The following consecutive steps should be followed in putting on the apparatus before entering a toxic atmosphere: 1.  Check the pressure gauge in the cylinder valve to insure  that  the  cylinder  is full  (2216  psi  pressure).    If  there  is  less  pressure,  the  service  life  will  be  reduced accordingly. 2.  Put on the apparatus using either of the following methods: (a)  Open  the  lid  of  the  case  and  extend  the  shoulder  straps  to  their full length. Lean  forward:  grasp  the  cylinder  and  backplate  firmly  with  both  hands, between the cylinder clamp and the waist belt.  Lift the apparatus straight up and over the head and rest it on your back.  The shoulder straps will fall into place  over  the  shoulders.    Adjust  straps  before  straightening  up.    Fasten waist belt snugly.  Should further adjustment be necessary, lean forward and adjust straps.  Use of chest strap is optional. (b) Extend narrow shoulder straps.  Don the apparatus like a vest.   Lean forward while the shoulder straps are being adjusted.  Fasten waist belt securely and snap chest strap if desired. 3.  Close the By-Pass (red) handwheel on the Pressure Demand Regulator and open  the  Cylinder  Valve  Handwheel  fully  (at  least  3  turns).    As  the  cylinder  valve  is being opened, the Audi-Larm will ring as pressure in the high pressure hose increases. This   indicates   the   Audi-Larm   is   functional.      If   the   Audi-Larm   does   not   ring,   the equipment should be checked and corrected before proceeding. 4.  Place palm of hand over the Pressure Demand Regulator outlet firmly to block it leaktight.  This is necessary as the Pressure Demand Regulator is spring loaded and air will flow automatically it the outlet is not blocked. 5.  Open the Main Line (yellow) handwheel fully and observe the pressure gauge on the Pressure Demand Regulator.  This gauge indicates continually the pressure in the cylinder and should read approximately 2200 psi (2216 actually) if fully charged.  If there is less pressure in the cylinder the service life will be reduced accordingly.  Turn off the cylinder valve and watch the pressure gauge on the regulator.  There should be no drop In pressure if the equipment is leaktight and if there is noticeable deflection of the needle, the equipment should be checked and the leak corrected before entering a toxic  atmosphere.    Again  open  the  cylinder  valve  handwheel  fully  and  lock  open  with lever.  Shut off Main-Line Valve. 6.      The   facepiece   is   then   put   on   using   the   following   method:   Pull   out   the facepiece headband straps so that the ends are at the buckles and grip the facepiece between thumb and finger.  Insert the chin into the facepiece and pull headbands back over the head.  To obtain a firm and comfortable fit against the face at all points, adjust headband as follows: (a) See that straps lie flat against the head. (b) Tighten lower or 'neck" straps. (c) Tighten "side" straps (do not adjust forehead or "front" strap). (d) Place both hands on headband pad and push in towards the neck. (e) Repeat operations (b) and (c). (f)  Tighten  forehead  or  "front"  strap.    if  necessary  to  position  the  lens  for  best vision. Test  the  mask  facepiece  for  tightness  by  squeezing  the  corrugated  breathing tube tightly.  Inhale gently so that the facepiece collapses slightly and hold breath for ten seconds.  The facepiece will remain collapsed while the breath is held providing the assembly is gas tight.  If any leakage is detected around the facial seal, readjust head harness straps.  If other than facial seal leakage is detected, investigate the condition and  correct.    The  facepiece  must  be  subjected  to  a  tightness  test  before  each  use. Connect  mask  hose  to  regulator.    Open  Main-Line  (yellow)  valve  handwheel  fully because the handwheel must be turned as far as possible to insure adequate air flow under varying cylinder pressures. 7.  Test the complete system for air flow from the cylinder to the facepiece by breathing normally.  The regulator should follow the normal breathing pattern. 8.    Test  the  By-Pass  (red)  valve  by  opening  it  briefly.    With  the  By-Pass  valve open, a rush of air should be delivered to the facepiece.  It the rush of air is delivered, the apparatus is ready for use.  Close the By-Pass (red) valve. 9.        Breathe    normally    as    the    apparatus    automatically    satisfies    breathing requirements. SERVICE LIFE This equipment is approved by MSHA and NIOSH as a "1/2-hour duration" unit, based  on  the  fact  that  the  equipment,  when  tested  by  NIOSH  on  men  performing moderate-to-heavy work, was found to last 30 minutes or more in each of the different types of work tests. The  user  should  not  expect  to  obtain  exactly  30  minutes  service  life  from  this apparatus  on  each  use.    The  work  being  performed  may  be  more  or  less  strenuous than that used in the NIOSH tests.  Where work is more strenuous, the duration may be shorter, possibly as short as 15 minutes. The duration of the unit will depend on factors such as: (a) the degrees of physical activity of the user: (b) the physical condition of the user: (c) the  degree of which the user's breathing is increased by excitement, fear, or other emotional factors: (d)  the  degree  of  training  or  experience  which  the  user  has  had  with  this  or similar equipment: (e) whether or not the cylinder is fully charged at the start of the work period: (f) the possible presence in the compressed air of carbon dioxide concentrations greater than the .04% normally found in atmospheric air: (g)  the  atmospheric  pressure;  it  used  in  a  pressurized  tunnel  or  caisson  at  2 atmospheres  (15  psi  gauge)  the  duration  will  be  one-half  as  long  as  when used at 1 atmosphere and at 3 atmospheres will be one third as long. (h) the condition of the apparatus. USE IN TOXIC ATMOSPHERE It is necessary to periodically check the pressure gauge on the Pressure Demand Regulator  as  it  continually  indicates  the  pressure  in  the  cylinder  When  the  needle reaches approximately 540 psi on the pressure gauge, the Audi-Larm Signal will begin ringing.  When the bell starts ringing or when the pressure reaches 540 psi, it is time to return to fresh air. During  normal  use  the  By-Pass  (red)  valve  is  closed  and  is  used  only  if  the Automatic Pressure Demand Regulator becomes inoperative.  It provides a continuous flow and should be opened first, the Main-Line (yellow) handwheel closed.  and the By- Pass  valve  adjusted  to  provide  the  flow  desired.    Leave  hazardous  area  immediately since lite of apparatus is greatly diminished when By-Pass valve is being used. Never remove the facepiece except in a safe, non-hazardous, non-toxic atmosphere. AFTER USE 1.    Unlock  the  lever  on  the  cylinder  valve  and  close  the  valve.    Do  not  use excessive force as the valve closes leaktight with little effort. 2.    Release  pressure  in  high  pressure  hose  by  breathing  until  air  is  exhausted and  then  remove  facepiece.   DO  NOT  USE  BY-PASS  VALVE  TO  EXHAUST  AIR PRESSURE.    Disconnect  the  hand  tight  coupling  nut  at  the  cylinder  valve.    Do  not disconnect with pressure shown on the pressure demand regulator gauge. 3.  Release the cylinder clamp drawbolt and remove the cylinder. 4.  Replace cylinder with a full charged one and connect line hand tight coupling nut at the cylinder valve. 5.      Remove   the   facepiece   assembly   and   clean   and   sanitize   it   with   MSA® Cleaner-Sanitizer (Pt.  No.  34337). (a) Make a solution  with  the  contents  of  one  package  added  to  water,  following the instructions on the Cleaner-Sanitizer carton. (b) Immerse facepiece and tube in the solution and scrub gently until clean. (c) Rinse in clear warm water and allow to air dry. CAUTION: Cleaning and Sanitizing at the recommended 120 F temperature will avoid  possible  overheating  and  distortion  of  parts  of  the  respirator  assembly,  which would necessitate replacement. 6.  CAUTION  -  Before  placing  mask  in  case,  release  pressure  from  system  as described in step No.  2 immediately above. 7.  Place apparatus in case (see packaging arrangement diagram). 8.  Store flat, in a cool, dry place where possible. REPAIR Replacement  or  repairs  shall  be  done  only  by  experienced  persons  with  parts designed  for  the  apparatus.    No  attempt  shall  be  made  to  replace  components  or  to make adjustment or repairs beyond the manufacturer's recommendations. Manufactured by MINE SAFETY APPLIANCES COMPANY PITTSBURGH, PENNSYLVANIA, U.S.A. 15208 SL487(L) Rev.7 463620