Filter Installation

Threaded Styles:

Threaded Hole Preparation:
  • Ensure that the threaded mounting hole is open.  Plating of threaded holes in mounting bulkheads reduces thread clearance.  Constrictive holes increase the needed installation torque dramatically.  If the threaded hole is to be plated, use an oversize tap and allow for 4 times the plating thickness.  Remember, threaded style filters are hollow and contain fragile ceramic element(s).
Use Proper Installation Tool:
  • For hex head filters, use a socket type tool . 
  • For round head filters, use a spanner or notched screwdriver bit .
  • Use a good quality torque wrench.  Do not exceed recommended installation torque:

    4-40s, Metrics:

    2.0 inch-pounds

    8-32s

    6.0 inch-pounds

    1/4-28s

    7.0 inch-pounds

  • Do not insert the filter by using the lead wire/terminal!.  Twisting the filter in by the lead can compromise the integrity of the internal components and/or bonds.
  • Do not use pliers or other gripping tools as the hollow body may deform and break internal elements.
Soldering to Leads/Terminals:
  • Use a temperature controlled soldering iron. 275 degrees Celcius is typical.  Dwell time for soldering iron tip should not exceed 5 seconds.
  • Use a heat sink next to the filter body whenever possible.
  • If a wire wrap is to be performed, isolate any torque on the lead/terminal from reaching the filter.

 

Solder-In Styles:

Hole Preparation:
  • Ensure that the mounting hole is open.  Installation hole size for a solder-in filter should be .003-.005" over the maximum tolerance of the minor diameter of the mounting portion of the eyelet with a +/-.002" tolerance.
  • The hole must be plated in order to achieve a durable hermetic seal.  Allow for 4 times the plating thickness when machining the hole.
Soldering to Leads/Terminals:
  • 60-40 solder is recommended for installation.
  • A controlled temperature profile not exceeding 3 degrees Celcius per second is recommended.
  • Infrared ovens are not recommended for installing filters.  The infrared energy may cause the sealing epoxy or glass to superheat, causing expansion pressure which reduces the apparent reflow temperature of  internal solder of the solder-in.
Soldering to Leads/Terminals:
  • Use a temperature controlled soldering iron. 275 degrees Celcius is typical.  Dwell time for soldering iron tip should not exceed 5 seconds.
  • Use a heat sink next to the filter body whenever possible.
  • If a wire wrap is to be performed, isolate any torque on the lead/terminal from reaching the filter.

Press-in Styles:

Hole Size:

  • For use as a Press-In: use a 0.1405"+/-.001" (#28) diameter mounting hole.  We recommend drilling an undersized hole (0.125") and reaming to final size.
  • For use as a Solder-In with a light grip until soldering: use a .144+/-.001" (#27) diameter mounting hole.  Do not forget to allow for the the plating thickness in the hole.
  • Do not chamfer edges!  A slight break of no more than .005" is recommended.
  • If a filter is installed in a hole that is approaching the minus limits of the tolerance, slightly higher installation forces will be needed.
  • Do not install in holes smaller than .136" in diameter

Installation Tool:

  • For evaluation purposes, EMI Filter Company offers a simple installation tool, P/N IT-PZ that can be inserted into the chuck of a drill press or similar equipment. 
  • It is very important that the tool used to press in the filter does not bear down on the either the glass and/or epoxy seals of the filter.

Installing Press-In Filters with EMI Filter Company Tool:

  1. Insert tool into chuck or other similar equipment so that the hex head of the tool is gripped.
  2. Insert the lead on the flange end of the filter into the installation tool.
  3. Lower the chuck, making sure that the filter enters the hole squarely and continue pressing  until the flange contacts the face of the bulkhead.
  4. Back the tool off the filter lead.  The filter is installed.

Sealant:

  • If more of an atmospheric seal/increased bond is desired, a small drop about 1/8" diameter of EMI P/N PLF-2ML sealer can be applied to the area where the flange comes in contact with the bulkhead.  The sealer will wick around the flange and fill all open areas in the mounting hole.
  • Full cure is achieved over night at room temperature.
  • Do not try to cure faster by heating.

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