The definition of choked flow in IEC 60534-2-1 is:
My question is, does this apply for backpressure valves where the upstream pressure varies at constant downstream pressure? My sizing calculation for a backpressure application has used the choked flow pressure drop for the sizing pressure drop...
I have seen a few differential pressure gauges now with a logarithmic scale in flow units and a scale factor written on the dial e.g. x600 IGPM etc. What is the reason for the x600 scale?
What purpose is the battery on the Logix5555 processors? Is the application program stored on some sort of internal SRAM that requires battery backup in case of main power failure? I have also read that some of the processors can come with or be retrofitted with a flash memory module or compact...
If I wanted to size a regulator that is to be installed in bypass around a pump i.e. back-pressure regulator and I know the desired back-pressure how do I determine the size of the valve based on the pump curve?
I am asked if it is possible to limit the output of a PID controller by putting a software restriction on the output signal to the actuator. In this case it is a temperature controller on a fired heater and is regulating heat input into the system and controlling output temperature.
The...
I have come across a 110V a.c. switched mode power supply that shows Live, Neutral and Earth input terminals and includes fuse and VDR input protection but does not state whether a 55-0-55V a.c. input is acceptable.
In general are centre-tapped supplies a problem for power supply inputs?
