How to bench test a water meter?

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Eddy Current:

I have no idea what you are talking about. There are many aspects to water quality. What do you want to check?

The electrical conductivity of water is one possible measurement. Another would be some measure of the biological contamination of the water.

Turbidity is another test, and would be performed with light and and a photocell. This could be by obscuration or reflection.

An example: I was looking for some distilled water. In the Yellow Pages I found a local company that that claimed to have distilled water by virtue that distilled water was in their advertizment. I went to their plant to get a gallon sample. There they told me that their water was filtered, but was as pure as distilled water and laboratory tests showed no difference. I bought a gallon. Took it home and tested it with my conductivity meter. It was nothing close to distilled water. They totally lied when claiming it was comparable to distilled water.

Absopure distilled water from the grocery store does test like one would expect from a sample of distilled water. It should be noted that distilled water when exposed to air has a very slight conductivity resulting from CO2 from the air being dissolved in the water. Also Absopure filtered water from the grocery store had less conductivity than the water from the local supplier, but higher than distilled water as would be expected.

I tested filtered water from another store where they have an in-store filter machine. Its conductivity was quite high. In other words their filters needed replacement.

I do not know the procedures for biological testing of water. But these tests are not an electrical test.

When doing conductivity tests of water you should use AC or quickly switch the polarity of a DC ohmmeter. A Simpson 260 is easy to switch polarity. A strictly DC test has a polarization problem. Stick two ohmmeter leads in a glass of tap water and you will see the reading increase with time. Obviously the probe tips need to be at a fixed spacing and fully immersed. Better to use a commercial conductivity probe.

See

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- ESTEddy Current:I have no idea what you are talking about. There are many aspects to water quality. What do you want to check?The electrical conductivity of water is one possible measurement. Another would be some measure of the biological contamination of the water.Turbidity is another test, and would be performed with light and and a photocell. This could be by obscuration or reflection.An example: I was looking for some distilled water. In the Yellow Pages I found a local company that that claimed to have distilled water by virtue that distilled water was in their advertizment. I went to their plant to get a gallon sample. There they told me that their water was filtered, but was as pure as distilled water and laboratory tests showed no difference. I bought a gallon. Took it home and tested it with my conductivity meter. It was nothing close to distilled water. They totally lied when claiming it was comparable to distilled water.Absopure distilled water from the grocery store does test like one would expect from a sample of distilled water. It should be noted that distilled water when exposed to air has a very slight conductivity resulting from COfrom the air being dissolved in the water. Also Absopure filtered water from the grocery store had less conductivity than the water from the local supplier, but higher than distilled water as would be expected.I tested filtered water from another store where they have an in-store filter machine. Its conductivity was quite high. In other words their filters needed replacement.I do not know the procedures for biological testing of water. But these tests are not an electrical test.When doing conductivity tests of water you should use AC or quickly switch the polarity of a DC ohmmeter. A Simpson 260 is easy to switch polarity. A strictly DC test has a polarization problem. Stick two ohmmeter leads in a glass of tap water and you will see the reading increase with time. Obviously the probe tips need to be at a fixed spacing and fully immersed. Better to use a commercial conductivity probe.See

http://en.wikipedia.org/wiki/Purified_water

If you are looking for more details, kindly visit tnma.

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If you are looking for more details, kindly visit Water Meter Test Bench Systems.