Deadweight + Level - Prcpls of Industrial Measurements - Weaver

What is a deadweight tester?

A pressure calibration tool used to test the accuracy of pressure gauges and sensors

How does a deadweight tester work?

It produces pressure by exerting a force (weights) over a known area (piston)

What value of error do you want to stay within?

+ or - 0.05%

When buying a new deadweight tester it is important to…

Buy one that is calibrated to local gravity to eliminate error

How do you calculate corrected pressure values?

Take pressure values from most recent deadweight calibration and multiply by a correction factor formula

What is the correction factor formula for finding corrected pressure values?

local gravity/standard gravity(980.665 gals)

What is more accurate, stainless steel machine weights or cast weights?

Stainless steel weights

Unless specified otherwise, deadweight testers are calibrated to what value?

standard gravity (980.665 gals)

What kind of weights will NOT provide accurate measurements?

Dirty, corroded, or chipped weights

Is it important that deadweight testers be used on a level surface?

Yes

Review and practice tank problems in deadweight conversions packet

ok

Would it be more accurate to use one 50 lb weight or two 25 lb weights?

One 50 lb weight

Are there any weights with decimal numbers?

No, only whole numbers

Does the specific gravity of a wet leg need to be less than the deadweight system?

No, it needs to be higher

What info comes stamped on weights?

local specific gravity, serial number, and “H20