Thanks guys,
I'm also concerned with the hubs; if they're true hubs and not switches, what about collisions and delay? I've asked the compressor controls vendor (CCC) for some particulars on the communications protocol because the sales guy kept telling us that it was 'high speed'.
Also, the...
I'm working on a project for a client to upgrade existing air compressors by individual 'slave' controllers on each compressor and one load-shedding master controller. These controllers communicate via a vendor-proprietary protocol over fiber. Since fiber is involved, the client's IT...
I have seen many Therminol or Dowtherm liquid systems use a delta P control loop in parallel with their individual 'circuits', with manual valves and local temperature gauges on each circuit. The delta P control does just that; provides consistent pressure across all circuits. The manual...
Many thanks for all of the input and suggestions. As it turns out, there are two mistakes in the process data. We (instrumentation) were given the wrong gas density. The mass flow rate was given in PPH, so the incorrect density ( by more than an order of magnitude) resulted in grossly...
We have an application to measure inert gas flow in a 36" duct at just under 300 SCFH. There is flammable trace dust, which also melts at about 210F. So we're concerned about using a 'hotwire-type' sensor because the dust will melt onto the heated RTD causing measurement errors. We contacted...
