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Hi everybody,
We have a sewage tank and we need some level switches as a back up for hydrostatic level transmitter which generates alarms and start/stop commands to pumps, valves, etc. The question is what type of level switch is proper for this application. Some facts regarding this issue are as follows:
1. In some cases the tanks are agitated (no calm surface)
2. The media is sludge and other thick and slurry stuff.
3. We need multi point switches (up to 5 points)
4. The level range is around 10m and less.
To me, float switch is not proper for this application at all. I know capacitance, thermal and vibrating level switches are good. I am also aware of bubbling type but it cannot be used as we have no compressed air available. I know some optical level switches are also used in for sludge but I doubt they are trouble free! I try to avoid ultrasonic as well, since the tanks are agitated.
I want to avoid the complexity of nuclear, radar and microwave type as well.
Personally I think capacitance level switches are best for such an application.
I would appreciate expert comments about this issue concerning the technical and commercial aspects.
Beat Regards,
Hamid
We have a sewage tank and we need some level switches as a back up for hydrostatic level transmitter which generates alarms and start/stop commands to pumps, valves, etc. The question is what type of level switch is proper for this application. Some facts regarding this issue are as follows:
1. In some cases the tanks are agitated (no calm surface)
2. The media is sludge and other thick and slurry stuff.
3. We need multi point switches (up to 5 points)
4. The level range is around 10m and less.
To me, float switch is not proper for this application at all. I know capacitance, thermal and vibrating level switches are good. I am also aware of bubbling type but it cannot be used as we have no compressed air available. I know some optical level switches are also used in for sludge but I doubt they are trouble free! I try to avoid ultrasonic as well, since the tanks are agitated.
I want to avoid the complexity of nuclear, radar and microwave type as well.
Personally I think capacitance level switches are best for such an application.
I would appreciate expert comments about this issue concerning the technical and commercial aspects.
Beat Regards,
Hamid