"Those are the actual PSI( pounds per square inch )"
Note that if these are LUP pressures then they "Are Not" actual psi. We poor peons will never sort all this out until the makers & proof houses decide to use correct terminology. 1 actual psi should be 1 psi whether measured by SAAMI, CIP or whoever. Some 40 yrs ago we of the US quit using the psi term except on those pressure recorded by the tranducer method which repotedly gives correct readings. Others are listed as LUP's or CUP's depending upon the crusher metal. The 14.503 conversion factor between psi & bar is based upon "Actual Correct" pressure readings, not crusher pressure.
I think Miller summed up the situation concisely.
Take a look at the second picture, "appareil-manometre a multiples crushers", "pressure test apparatus for multiple crushers". A very slick piece of test equipment in the
19th century!The more I look at that piece of test equipment, the more the phrase, "human error" goes through my head. I am sure that on the best of days, every effort was made to achieve the highest degree of human precision to measure those crushers. I also wonder just how far off the measurements could have been on the worst of days. Besides just the measurements, some pretty slick statistical techniques would have to have been in use to throw out the aberrations that human error potentially introduces. All of this gets put by the wayside with the introduction of transducers.
Why certain groups insist on using outdated terminology is a mystery to me. The sensor and circuitry are wired to show the output using a chosen nomenclature. However, the raw data is independent of this gibberish. In other words the sensor is producing either voltage or resistance. Call it that.
Pete
