Thanks Controlnovice for the reply, I agree all those issues you higlighted are critical for a good detailed estimate. But my question really is that is there a tool for an un-constrained estimate? sometimes at the very early stage of a project, you want to do an un-constrained estimate of...
Please does any one know any application or spreadsheet for quickly estimating the number of Marshalling and System cabinets required for a DCS control system- assuming the number of I/O s to be terminated are known ?
Many thanks Gerhard,
To explain a little better:
I already have two valves interlocked together with the attached schematic, but I want to add a third valve with a simple modification to the existing scheme. The condition remains that only one valve will be open at the same time. Note also...
Helpfull members,
I want to interlock three on/off valves with a pneumatic 3/2 solenoid valve on each valve such that only one of the valve can open at a time. Can anybody propose a scheme for this?
Does anyone know what Ex"de" hazardous area equipment protection really mean?.
Ex"d" means flame-proof while Ex"e" means increased-safety, these are based on two different principles hence I am a little confused on how the two can be combined together for the same equipment.
