Only way to check correctly; is to have it tested independently and the testing place / people to have a test system that is within Calibration dates and a method / process to ensure consistency etc. And if your doing it right you will be looking for a target value and may also look at linearity. Some may be fine at 10 but be out by 1 or 2 bar below 8 or above 12 etc...
For me the Brew gauge only needs a +/- 2 bar range and even then the accuracy will be +/- 0.5 bar. Thus one could read 8.5 and another read 9.5 and yet they are 100 % and the actual could be 9. Or they could both read 9 but the actual could be 8.5 or 9.5.... Have seen 5 separate gauges all get different readings and also different on different machines. If you not getting a perfect seal, then any leakage will have an impact. Also as any air in teh system is trapped; then compression and release can cause a flutter AND do not forget and crap / grinds / dirt etc can cause the OPV to flutter and or have issues. Vibe or Rotary pump ? I have a Locally made scace that has a bead to simulate flow Have seen all sorts of issues with a OPV that would work well when some one used a blind - ie with no flow; thus lots of excess pump pressure to work the OPV. Yet when run on my test unit (and a controlled bled) OR with a puck with coffee in it, the unit would flutter a bit. Yes gauges were not in agreement but at the end of the day it was a dirty / old OPV and a clean fixed it. A while later it was replaced a steh owner no longer felt he could trust it.... Moral = The gauges are only indicators and the result in teh cup is what it should be about. Unless using a calibrated gauge with a known accuracy and a defined response range etc, your stressing over measurements that you may not fully understand and could lead to making a Mountain out of a Mole hill. PS. Spent many years in a Medical Calibration lab and studied Metrology. Great field but frustration when trying to explain the detail to many. Just focus on the big picture. The gauges your working with; are Indicators, not measurement devices. -- You received this message because you are subscribed to the Google Groups "Brewtus" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/brewtus?hl=en.
