LEVEL CONTROLLERS AND LEVEL DETECTORS

CENTROID PRODUCTS, email: centroid@compuserve.com, fax 386-423-3709, tel 386-423-3574

1. LEVEL CONTROLLERS

Centroid's Level Controllers are designed to turn a pump on at one level and off at another level.  A typical application is to automatically transfer fuel into a day tank when the liquid level in the tank gets low.  Centroid uses the abbreviations LCF (level controller for fuel) and LCW (level controller for water).  The on and off points are adjustable. 

Note that the controllers do not have an output to drive a gauge.  This means that if you also want to gauge the tank, it unfortunately requires two senders.

The relay on the controllers is capable of switching up to 10 amps at 120VAC.  It adds approximately 0.2 inches to the height of the standard sender package.  Level Controllers are only available with wires for the electrical connections rather than screw terminals.  The wire color scheme is:   red=battery voltage, blk=ground, green=relay pole and relay normally-open contact, white=relay normally-closed contact (note: this contact is not normally brought out, unless it is requested).

You will need to specify whether the controller is low-on or high-on.

2. LEVEL DETECTORS

Level Detectors are nearly identical to Level Controllers except they switch on and off at one point. instead of at separate points.  The most common use is as an automatic shutoff for a pump when the tank level gets too low.

3. LOW ALARM FOR FUEL, LOW ALARM FOR WATER, HIGH ALARM FOR FUEL, HIGH ALARM FOR WATER

The LAF, LAW, HAF, and HAW are for the occasional customer who only needs an alarm light rather than a gauge plus alarm light.  These units provide a transistor closure to ground rather than having a relay, with the typical application being to light a warning light.  The transistor can switch DC current only, up to 0.3 amps.  The alarm level is adjustable.  Unlike the Level Controller and Level Detector, these senders can have screw terminals for their electrical connections.