Quantcast Functional Description of AOAP Mobile Laboratory Unique Equipment

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TM 10-6640-233-10 1-19. Functional Description of AOAP Mobile Laboratory Unique Equipment.  The following paragraphs describe some of the equipment mounted or stored within the laboratory.  For equipment not described in these paragraphs, refer to the appropriate equipment manual. a.     The  fluid  analysis  spectrometer  display  (A/E35U-3A)  (Figure  1-8)  is  a  1-meter  emission  spectrometer  with  an LED liquid readout specifically designed for sample oil analysis.  It has a console-type equipment cabinet permitting the operator to carry out the routine procedures of analysis while seated at one location.  Except for the main power circuit breaker control, all operating controls are conveniently within the reach of the operator while in a seated position.  Panels have   been   designed   to   permit   quick   removal   and   provide   access   for   performing   required   maintenance.      The spectrometer  equipment  includes  personnel  safety  features  such  as  safety  interlocks,  venting  of  noxious  fumes,  and protection  from  ultraviolet  rays.    Equipment  protective  features  include  circuit  breakers,  fuse,  interlocks,  and  venting. Electromagnetic  interference  is  controlled  by  RFI  filters  and  proper  grounding  of  all  electrical  components  within  the instrument, while critical items have been individually shielded.  The sample excitation chamber is interlocked to protect the operator from high intensity ultraviolet light, shock from the carbon rod/disk are (22,000 volts peak), and exposure to noxious or flammable fumes while sample analysis is in progress.  During normal operation, the carbon arc will totally "burn"  the  sample,  leaving  no  residual  flammable  fumes  or  vapors.    The  chamber  venting  is  adequate  to  purge  the chamber  of  all  noxious  or  flammable/combustible  fumes.    The  spectrometer  is  a  preventive  maintenance  tool  used  to determine  the  type  and  amount  of  wearmetals  in  lubrication  oil  samples  of  engines/transmissions  and  in  fluids  of hydraulic  equipment.    The  spectrometer  is  capable  of  detecting  and  measuring  the  concentration  of  the  following elements: Iron (Fe) Nickel (Ni) Cadmium (Cd) Silver (Ag) Lead (Pb) Molybdenum (Mo) Aluminum (Al) Silicon (Si) Zinc (Zn) Chromium (Cr) Tin (Sn) Sodium (Na) Copper (Cu) Titanium (Ti) Manganese (Mn) Boron (B) Magnesium (Mg) Vanadium (V) Barium (Ba) Beryllium (Be) The operation of the spectrometer is based on the atomic emission technique.  This technique depends on the fact that atoms  of  elements  can  be  energized  (excited)  to  emit  radiant  energy  when  exposed  to  a  suitable  excitation  source. When this radiant energy is dispersed by either a prism or a diffraction grating, it emerges as a light spectrum having a pattern  determined  by  the  structure  of  the  atoms  that  have  been  excited.    Since  atoms  of  different  elements  contain different electron configurations, each element has a distinct and characteristic spectrum, with spectral lines occurring at different  wave-  lengths.    Each  element  can  be  identified  by  its  characteristic  lines.    In  quantitative  analysis,  line brightness  represents  element  concentration  in  the  sample.    Line  brightness  is  converted  from  radiant  energy  into electrical  energy  by  a  suitable  photomultiplier  tube.    The  electrical  signal  at  the  output  of  the  photomultiplier  tube  is processed and displayed on a readout device. The  spectrometer  can  be  divided  into  seven  main  groups.    The  groups  have  been  given  titles  according  to  their functions, and with the exception of a few items, assemblies and subassemblies are physically located in the cabinet or chassis of their respective groups.  The groups are as follows: a.    Sample excitation group e. Integration group b.     Optical processing group f. Power distribution group c.     Control group g. Optional group (automatic printer) d.     Electronic processing group 1-21


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