Pressure to weight
Pressure to weight
(OP)
There are some weighing systems in some machines operated by hydraulic pistons and are quite precise. They calculate the weight by converting the measured pressure from the pistons via pressure sensors. Does anybody know or have an idea how the system works? How do they convert pressure to weight?





RE: Pressure to weight
PSI = Pounds per square inch
or
PSI = lbs/inch2
Piston Area = inch2
PSI x Piston Area = lbs/inch2 x inch2= lbs
This is the force the piston will be providing. If it is positioned vertically then it is also the weight.
With certain conditions met. The main one being there is no stiction present.
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: Pressure to weight
RE: Pressure to weight
What reference? Local gravity.
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: Pressure to weight
RE: Pressure to weight
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
RE: Pressure to weight
Perpendicular to the planet's surface. Which is in-line with the force of gravity.
You would want to calibrate for better accuracy.
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: Pressure to weight
RE: Pressure to weight
Her is a link: http://www.ashcroft.com/products.cfm?doc_id=352
Hydraulic pressure applied against a precisely known piston area is used to lift precisely known weights. All these parameters are NIST traceable and are useful as an absolute reference standard when calibrating pressure instruments.
RE: Pressure to weight
"3.3.4 Levelness
The deadweight tester must be level to function properly.
The unit may be leveled by placing a bubble type level on
top of the piston plate and revolving it slowly. Shims may
be used between drip pan and bench to level the piston
plate. The unit is level when the position of the bubble
does not change within the glass as it is rotated on top of
the piston assembly."
Small angular deviation will, as mentioned earlier, cause an effect as the sine of the angle, but any side-load component (cosine) may cause binding of the plunger and introduce a hysteresis error. Careful leveling will avoid this error.