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Filter Minder® Visual / Electrical Switches

Filter Minder® Non-Locking Air Switch

Air Filter Restriction Monitoring Switch

Triggers Air Filter Warning Light / Non-Locking


How It Works

The Filter Minder® Non-Locking Air Switch continuously monitors the engine air filter and tells when filter is restricted. Triggers air filter warning light via the engine computer or directly to the warning light. Used for air filter monitoring on diesel, gas, and alternate fuel engines, as well as other applications where low vacuum/pressure monitoring is required.

Filter Minder® Non-Locking Air Switch


196389 (Packard Metri-Pack 150 series)
196351 (Ampseal 16)


Mounts directly to air cleaner or air induction piping.  See Accessories / Related Products for adaptor fittings and brackets for remote mounting.


  • Vacuum or Pressure Monitoring
  • Vacuum Ranges: minimum 3" H20 (0.75 kPa) ± 40% @ 23°C to 50" H20 (12.4 kPa) maximum ±10% @ 23°C
  • Pressure Ranges:
    • Lowest set point - 0.11 PSI (0.75 kPa) ±20% @ 23°C.
    • Highest set point - 2.0 PSI (14 kPa) ±10% @ 23°C
  • Operating Temperature: -40°F to +250°F (-40°C to +121°C)
  • Material: Nylon
  • Mounting Port Connections: 3/8-24 Straight Thread O-Ring, M10x1 Straight Thread O-Ring or 1/8-27 NPT
  • Switch: Normally open or closed available


  • Length: 2.1" (53 mm)
  • Diameter: 2.0" (50 mm)

A Few of Many Industries Served

Air Filtration Markets Served


  • Uses a wiping motion to keep switch contacts clean for a long service life

  • Molded-in integral connectors

  • Versatile design with many options

  • Highly dampened to prevent switch dither

  • Multiple mounting configurations


  • Continuously monitors filter condition and tell when filter is restricted

  • Opens or closes a switch at highest set point which provides a signal to the control module or light

  • Allows full use of filter capacity

  • Reduces down time and aids in maintenance planning

  • Reduces operational costs for end-users

  • Helps prevent excess fuel consumption due to a restricted filter