I would really appreciate some help with a simple circuit design.
Here at the park we have a lift station that has a very simple warning light circuit. (See attache file) It's just a normally open mercury float switch that turns on the warning light when there is a high water condition. What it is actually signaling is a failure in the lead pump. If the water continues to rise the backup or lag pump come on and pumps the water out. The problem is that it is quite possible if not probable for the light to go unnoticed during the time from the high water condition and the lag pump coming on.
I need a means or method so that once the water has risen to the point of closing the float switch the warning light remains on until manually reset.
I know there must be a simple and elegant solution to what seems like a simple problem but my attempt this far have not been successful. I attempted to use a latching relay but it was designed for only a momentary signal contact and if the float remained closed for a period of time the relay just sit there and vibrated.
Any help you all can provide will be greatly appreciated.
Thanks!
Here at the park we have a lift station that has a very simple warning light circuit. (See attache file) It's just a normally open mercury float switch that turns on the warning light when there is a high water condition. What it is actually signaling is a failure in the lead pump. If the water continues to rise the backup or lag pump come on and pumps the water out. The problem is that it is quite possible if not probable for the light to go unnoticed during the time from the high water condition and the lag pump coming on.
I need a means or method so that once the water has risen to the point of closing the float switch the warning light remains on until manually reset.
I know there must be a simple and elegant solution to what seems like a simple problem but my attempt this far have not been successful. I attempted to use a latching relay but it was designed for only a momentary signal contact and if the float remained closed for a period of time the relay just sit there and vibrated.
Any help you all can provide will be greatly appreciated.
Thanks!