I operate a reverse osmosis system for my home. One stage of that system uses a UV light to sterilize the water output from the system. It uses a UV bulb about 10 inches long and about 3/4 inch diameter. These units don't seem to last very long and have to be replaced. My question has to do with how this thing works:
The light is powered by a small transformer plugged into house current and is labeled as a ballast with an output of 44 VAC @ 6 A. I've examined the bulb units that won't light and see that there's what appears to me to be one of the small neon indicator lamps wired in series with the two filaments of the UV bulb. The filaments on the UV bulb are intact and, if I shunt across the little neon lamp with a 100 ohm power resistor, the UV lights. My problem is that I can't find out what this small neon bulb is. When the unit quits, the little neon bulb is blackened on the interior surface and I can see no lettering on it.
Does anyone know what the function of this neon bulb might be? I've read that the neon lamp can be used as a voltage regulator to give about 90 V and, of course, the amount of power flowing through it must be quite small. I'm wondering if the neon bulb is acting as a starter for the UV bulb.
The light is powered by a small transformer plugged into house current and is labeled as a ballast with an output of 44 VAC @ 6 A. I've examined the bulb units that won't light and see that there's what appears to me to be one of the small neon indicator lamps wired in series with the two filaments of the UV bulb. The filaments on the UV bulb are intact and, if I shunt across the little neon lamp with a 100 ohm power resistor, the UV lights. My problem is that I can't find out what this small neon bulb is. When the unit quits, the little neon bulb is blackened on the interior surface and I can see no lettering on it.
Does anyone know what the function of this neon bulb might be? I've read that the neon lamp can be used as a voltage regulator to give about 90 V and, of course, the amount of power flowing through it must be quite small. I'm wondering if the neon bulb is acting as a starter for the UV bulb.