How To Build A Barometric/ Ejection Charge

 Testing Chamber

 

This is a quick and dirty "How To" on building an operational Barometric Testing Chamber for about $25.00.  Note: This only works for altimeters with barometric units, e.g., this unit does not work with accelerometers without a barometric unit.

What you will need are:

2 male end caps - 4' diameter
2 female end pieces - 4" diameter
1 4"x2" T
2 5" sections of 4" pipe
1 45 degree 2 street elbow
1 2" to 1.5" converter
1 small can of PVC glue
4 2" screws (diameter (you pick)
1 small can of plumbers putty
1 tube of plumbers epoxy
1 vacuum cleaner

Assemble into configuration that resembles pictures below:

Drill Screws and seal with plumbers expoxy - fig. 2

Add weight to end cap for stability.

Insert velcro strips into assembled chamber near bottom.

To Use to Test Altimeters:

isert altimeters (one or two)

Insert nozzle of vaccuum into 1.5" opening (seal with plumbers putty).

Turn vacuum on (for only 3 seconds)

Matches will fire as pressure drops.

 

To USE to Test Charges:

Insert charge:

lay unit on side with 1.5" opening facing up away from you

apply current to outside posts charges are attached (use 12 foot lead)

do not stand near - just to play it safe

clean inside with soapy water after you finished

 

Close Up of Unit - click to enlarge:

 

  1.   Posts to test matches

  2.   Side View (insert vacuum cleaner nozzle tp small pipe)

  3.   View form top (velcro to attach altimeters to - not required)

  4.   Side View with Screw Posts (attach matches here)

  5.   View from bottom (Bottom Cap weighted for stability)

  6.   Unit in Testing Position

 


 Include A Face Mask For Safety!