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Copyright 1996, 2000, Denis Cousineau
How to measure the strength of a pneumatic?
In fact, it is not the strength of a pneumatic that we will measure, but the
strength of the pump (or the tank) working behind. By attaching a weight to the
pneumatic and varying it, we are looking for the point of equilibrium, the point
where the weight exactly compensates the pull from the pressure tank. By
measuring this critical mass, we obtain the strength of the pressure generated
by the pump.
Below is a picture of the measuring device.
We measured the strength of the following pumps:
Type of compressor
It can lift
||The small pump
||The large pump with the pressure regulator
||The large pump without regulator
||The car pump
||it was not available, but we suspect it can blast the above
The pressure regulator I designed limits the pressure to be less than 900
grams while it could be as large as 1500 grams. This is the point of introducing
a security device: avoid overflow. At about 2000 grams, the hoses start popping
out of the sockets.
What is the reaction time of a pneumatic?
Pneumatics dont react instantly. The main factors are the pressures in the
hoses (generated from the pump, and maintained in the tank), and the length of
We tested with a hose of 3 m. If the switch is close to the tank, reaction
time is slower than when the switch is close to the application. This is because
the hose itself must be under pressure. When the switch is next to the
application, the hose is already under pressure and ready to push the pneumatic.
Position of the switch Time to expand fully the pneumatic
|Close to the pneumatic 0.25 seconds
|Far from the pneumatic 0.50 seconds
As seen the difference is not large, around a quarter of a second. However,
this difference increase if the number of pneumatics turned on at the same time