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I am having a problem with a vessel that has two interface level transmitters, one of them a GWR unit the other a float style with 2-20ma output.
They are mounted in stilling wells off the side of the vessel two tap units with the bottom wet the top dry.
The problem is when the vessel is put in service the float style moves up to setpoint(12.5%) and the radar only goes about half as high.
After running at sepoint for a few hours if the radar is isolated and drained then put back in service it will shoot up to 46-48%. If the control valve is then put in manual and the float is isolated drained and put back in service it will also shoot up to 46-48%. Then when the valve is put in automatic both drop very quickly to zero then the process starts all over again.
The process is spent caustic/strong kero, the vessel has a weir that will allow the kero to overflow to the other side and the spent caustic is supposed to stay in it's side and drain trough the bottom of the tank.
I have about four members of management screaming that i need to get my instruments working right.
I'm fairly certain that there is nothing wrong with them and it is an application problem, that the wells are not giving an accurate representation of what is going on in the vessel.
Anybody have any ideas?
They are mounted in stilling wells off the side of the vessel two tap units with the bottom wet the top dry.
The problem is when the vessel is put in service the float style moves up to setpoint(12.5%) and the radar only goes about half as high.
After running at sepoint for a few hours if the radar is isolated and drained then put back in service it will shoot up to 46-48%. If the control valve is then put in manual and the float is isolated drained and put back in service it will also shoot up to 46-48%. Then when the valve is put in automatic both drop very quickly to zero then the process starts all over again.
The process is spent caustic/strong kero, the vessel has a weir that will allow the kero to overflow to the other side and the spent caustic is supposed to stay in it's side and drain trough the bottom of the tank.
I have about four members of management screaming that i need to get my instruments working right.
I'm fairly certain that there is nothing wrong with them and it is an application problem, that the wells are not giving an accurate representation of what is going on in the vessel.
Anybody have any ideas?