Dead weight testers are devices used to generate known amounts of fluid pressure, to be used as standards for calibrating pressure-measuring instruments. When properly configured and operated, the fluid pressure generated by a deadweight tester will be exactly what it should be, and this precisely-known pressure may then be used to test the accuracy of any pressure-sensing instrument.
Information on how to use a deadweight tester may be found in the textbook, on the YouTube channel, and also in manufacturer’s literature for the deadweight testers themselves. You are expected to read the written documentation before using a deadweight tester.
Of the various mistakes we tend to make when demonstrating the use of a deadweight tester, the most common and most serious fall into two categories:
These two mistakes are so common that they deserve ample warning ahead of time.
The first mistake is caused by a tendency to take shortcuts, relying on colleague’ advice and easy-to- watch videos rather than taking the time to actually read the manual. You will find that reading the manual is an essential step for all the work we do in Instrumentation, so get used to it now!
The second mistake is caused by an over-reliance on the pressure gauge to indicate the fluid’s true pressure. Remember, the purpose of a deadweight tester is to produce a highly accurate fluid pressure against which we may test a gauge or other pressure instrument. If you correctly operate a deadweight tester and the gauge fails to register the correct pressure, it is the gauge’s fault and not the deadweight tester’s fault!
I’ve lost count of the number of times I’ve requested a student to apply 400 PSI to a gauge using a deadweight tester, and then the student thinks they’ve done something wrong with the deadweight tester when the gauge registers 395 PSI instead. The student then adjusts the deadweight tester in vain to try to get the gauge to read 400 PSI, or worse yet they resort to improperly operating the deadweight tester until they force the gauge to read 400 PSI. In fact, the only way to make an out-of-calibration gauge register any specified pressure is to incorrectly use the deadweight tester!
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