The Neptune E-Coder 900 RF-emitting water meters have two basic components. You may find one or both of these components in or outside your home, as explained below.
The first component contains the ‘face’ or digital display showing the amount of water you use. This component is about the size of a small alarm clock. Everyone with a Neptune E-Coder 900 meter should have one of these digital displays somewhere inside their home. It may be beside your hot water heater, in a closet or almost anywhere, but attached to an incoming water line.
In any case, it should say Neptune E-Coder 900 on the front. A picture of it is attached. It may have a clear plastic antenna that looks like a pipe cleaner sticking out, as explained below. But some versions of the meter have a black plastic attachment on top, without the antenna.
You can determine if it is digital by looking on the front of the meter. Digital meters have only numbers, like a typical digital clock. The old analog meters have small wheels which rotate, changing the numbers as the wheels turn.
Homes with newer models of the Neptune 900 meter only have this first component, which looks like a small alarm clock. In this case, you should see what looks like a 2-3 inch plastic pipe cleaner sticking out of the top. This is the transmitting antenna.
However, older models of the Neptune Meter have a second component, which is a small gray box that may be located in or outside the house. The gray box contains the transmitter. There should be a wire connecting the display (the first component) to the gray box. But the wire may not be apparent. A picture of the gray box is also shown below. However, the gray box can also be a little larger than what is shown in the picture.
In all versions of the Neptune meters, the meters emit pulses of RF radiation every 12 to 14 seconds, 24 hours a day. The radiation is transmitted from the antenna. If you have an RF detector and want to measure the radiation emitted by the water meter, you would need to place your detector near the antenna.
If you are unable to determine yourself whether you have a Neptune RF emitting water meter, you can also call the Fairfield Water Department to check.