jpboyt Senior Member Joined: 28 May 2010 Posts: 27 Location: Washington, USA Expertise: I love coffee
Posted Wed Oct 2, 2013, 7:00pm Subject: Re: Oscar low water light
Trolled on by this evening and took a gander at this string again. Lets stop for a minute. If you put the switch in, bypassing the sensor, it works and the low level light goes out. Put a piece of metal between the two wires and it doesn't work? This doesn't make sense to me. I don't work on the home stuff but if I understand what I have read, the reservoirs have floating magnetic sensors that close a set of contacts. The two wires going to the sensor are a signal wire and a ground. The sensor makes contact and grounds the signal. This shunting of the signal causes a logic low or on simpler boxes causes a voltage drop that then turns off a transistor or two that control the appropriate relays, or is dealt with by an operational amplifier. More complex boxes send a square wave out to the tank that is also fed to a logic flip-flop. When the signal is grounded though the square wave signal no longer shows up at the processor and the pump and auto-fill solenoid are shut off. Sorry, felt like typing this evening. Why yes, I do drink coffee... Why do you ask? jpboyt
CoffeeLoversMag Senior Member Joined: 10 Jan 2013 Posts: 175 Location: Seattle Expertise: I love coffee
Posted Thu Oct 3, 2013, 5:20am Subject: Re: Oscar low water light
Light indicator depends on the sensor or conductivity. To determine if there is water in the water tank, the light indicator will illuminate. Since you have acquired second hand Oscar, better check the connection otherwise your connection in the water has poor conduction. If you are using also water from reverse osmosis, all the minerals are removed as such no conduction takes place. Use tap water to conduct electricity that can illuminate the bulb indicator.
Did you know...? Dark roast coffees actually have less caffeine than lighter roasts due to the fact that the process of roasting burns off caffeine. www.coffeeloversmag.com/theMagazine
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