Motion Tests Day 16

Finally tried out the Asco Numatics Sentronic D today! You may recall I acquired a test unit the same time I purchased a gross of E22’s. Not sure how Numatics can recommend the Sentronic D over the E22 regarding “constantly changing setpoints” as the E22 seems to do a better job. Pros:

  • Easy installation (unless you are using a modular manifold then you are screwed)
  • Easy to wire up (no custom harnesses required)
  • Very precise (I tested the 50 PSI, large 8mm DN unit) high-resolution control


  • Requires more amperage, necessitating a larger 24V PSU
  • Significantly slower response time (no adjustment for trading speed vs. accuracy)
  • 40% of the flow rate compared to the E22 (0.81Cv vs. about a 2.0 Cv)

While I was out there, I added a pressure regulator to trim down the door closing force (safety concern). I also added a switch inside the door (temporary momentary switch to be replaced by an indicating, illuminated switch down the road). I wasn’t sure what path to take for integrating the switch in avionics – for now I made a custom device called “Door” which tracks the state, shares the state on a virtual component that gets monitored by CAS, and therefore allows us to send OPEN/CLOSE (from the exterior keyboard passcodes) and TOGGLE (interior momentary switch) commands. Finally, with the E22 back in service I caught a little of my wife’s first flight in the box:

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