2.  Do  not  touch  the  membrane located  inside the threaded extremity of the sensor 
with  a  finger  or  an  object  (see  Figure  1-2).    The  membrane  is  easily  impaired; 
impairing  the  membrane  damages  the  sensor  permanently,  thus  voiding  the 
warranty. 
 
Figure 1-2: Do Not Touch the Sensor’s Membrane with a Finger or an Object 
 
3.  Do  not  block  the  sensor’s  breathing  hole  or  puncture  the  breathing  hole’s 
membrane (see Figure 1-3).  Located above the sensor’s connector, this opening 
provides oxygen to the gas detector (inside the sensor).  Blocking this opening or 
puncturing  its  membrane  damages  the  sensor  permanently,  thus  voiding  the 
warranty 
 
Figure 1-3: Do Not Block the Sensor’s Breathing Hole or Puncture the Breathing Hole’s Membrane