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Updated 03/10/2009

Water Level Controllers

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This is a handy little board if you are interested in controlling the level of a liquid in a vessel.  It works based on conductivity of the liquid so it does not require a moveable float switch (although they can be used with this design).  It uses Darlington Transistors which enable this circuit to work with very clean (low conductivity) water.  It detects the presence or absence of liquid at the tip of the probes.  The controlling probes are placed at the desired upper and lower limit levels.  When the liquid level in the vessel drops below the lower limit probe (opening the normally closed contact), the 10A relay is activated which turns on your filling device (pump, solenoid, etc.) and remains on until the liquid level reaches the upper limit level probe (a normally open contact) at which time the relay opens and shuts off your filling device.  The probes for this board can be moveable level switches or simply stainless steel screws screwed into the (non-conductive) vessel at the desired levels.  They require 12VDC for operation.
 


 

Version 1 - Control Only: $23.25

This version will control the level of water in a reservoir.  It is available in a "Pump Up" (refill when empty) version or a "Pump Down" (drain when full) version.  Please specify which version you want when ordering.


Info Sheet


 
Version 2 - Control and Alarm: $45.25

This version has 4 probes.  Two “controlling probes” and 2 “alarm probes”.  The controlling probes are placed at the upper and lower limit levels and the alarm probes are placed at positions outside of the upper and lower level limits to signal when the level exceeds those limits.  When the liquid level in the vessel drops below the lower limit probe (opening the normally closed contact), the 10A relay is activated which turns on your filling device (pump, solenoid, etc.) and remains on until the liquid level reaches the upper limit level probe (a normally open contact) at which time the relay opens and shuts off your filling device.  If the level exceeds the upper and lower limits and triggers either alarm probe, the associated relay will close powering the alarm.  The alarm relays only stay activated as long as the alarm condition exists.  As soon as the alarm condition ends, the alarm will go off.  Only available in a "Pump Up" (refill when empty) version.

Info Sheet

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