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Panoramic Telescope M137
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TM-750-116 Topographic Support System (TSS) Downsized Direct Support Section (DDSS) Manual
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Panoramic  Telescope,
TM   750-116 (2)   Optical   System. (a) 2-5.a. (b) (c) (d) (e) Perform purging and charging procedure para Relief valve should open between 3-10 psig. Purge instrument at 7 psig  for 5 minutes. Ensure relief valve closes between 1-5 psig. Leak test for minimum of 5 minutes. h. Panoramic  Telescope,  M901A1  (fig.  3–76). NOTE Purge panoramic telescope when the internal optical surfaces are fogged over. Replace the desiccant and two preformed packings every time the unit is purged. Do not attempt to check the pressure in the panoramic telescope at any other time than during the pressurization cycle. Loss of pressure resulting from such attempts will shorten the time between maintenance actions. (1) Remove  desiccator  by  unscrewing  container  part (hex  head)  from  telescope  body. (2) Hold container part upright and remove slotted cap of  desiccator. (3) Discard  old  desiccant.  Discard  two  preformed packings from desiccator. Install desiccator. Figure  3-76  Panoramic  Telescope,  M901A1 (4) Close  nitrogen  tank  valve  and  pressure  regulator valve. 3-32 Contamination can damage the telescope. Blow pressurized nitrogen through the charging lines to remove contamination. (5) Open tank supply valve and observe high pressure gauge indicating that tank is pressurized. (6) Remove lockwire and cap from valve stem. The sealscrew is a captive screw and must not be removed. Removal of the screw dam- ages equipment. (7) Install hose assembly on valve stem and loosen setscrew. (8) Adjust pressure regulator to 4-5 psig (28 to 34 kPa) as indicated on low pressure gauge. (9) Verify nitrogen is being vented from sealscrew hole  and  observe  humidity  indicator. (10) Purge  telescope  until  all  sections  of  indicator  are blue. During purge, lubricate preformed packings lightly with  silicone  compound. (11) Close pressure regultor valve and tighten set- screw. (12) Remove dessicator from telescope body and refill desiccator to level slightly below threads. (13) Lightly lubricate preformed packing on top part of desiccator with grease or silicone compound. (14) Install top part of desiccator to bottom. (15) Lightly  lubricate  preformed  packing  with  grease or  silicone  compound. (16) Install  desiccator  on  telescope  body  and  tighten to 20 to 30 in lb. (2.25 to 3.39 Nm). (17) Slowly open pressure regulator valve and charge instrument to 2.0 + or - .0.5 psig (14 + or - 3 kPa). Tighten setscrew when pressure regulator gauge stabilizes. (18) If  overpressurization  occurs,  slowly  open  set- screw, adjust pressure regulator to 2.0 + or - 0.5 psig; then tighten setscrew when pressure regulator gauge stabilizes. (19)  Close  pressure  regulator  gauge.  Remove  hose assembly and replace cap on nut of valve and install lock- wire. (20) Close tank supply valve and verify on high pres- sure gage.

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