Installation of Two RADAR Gauge in Same Tank?

Are you worried about interference?

Why on Earth would one need to install two on the same tank?

If they gave different readings at any time, which is the one the Process Operatives might believe?

Take the average of the two.

If you use more, you can increase the accuracy!

There's a lot of assumptions that need to be met for a higher resolution to be possible with more sensors. Also resolution is a different measurement attribute from accuracy. In fact you'll most likely get less accuracy with multiple sensors than with one sensor.

That makes sense for readings such as level measurement. But I use multiple TC for temperature measurements, and for steady state conditions, I get a more accurate measurement by using multiple sensors. So I guess it depends on what you are measuring and the type of sensors you are using.

How can you be sure that you, "usually get a more accurate measurement by using multiple sensors"?

I don't believe that is a correct statement.

Multiple sensors present a range, with no possibility of a correction factor.

You get an average, nothing more.

But isn't that the whole point. If you get a range, you can get an average and a distribution of errors that will allow you to know if you have any systematic or random errors and allow you to correct them. Let say one of your sensors in defective or not calibrated properly. If you only have one sensor, you cannot know this.

You're incorrectly thinking that each sensor is measuring the exact same thing. That is one of the assumptions you have to recognize you are making. You also are assuming that the only errors are static, non-time varying errors. You're also assuming that your error distribution must be symmetric.

How will you know that one of your sensors is defective or not calibrated if you are averaging the good readings with the bad ones?

In all my time working with traceable, calibrated TC's and temp controllers as well as measuring instruments I never saw multiple readings averaged, unless you were looking at distribution of samples over time.

I'm not saying it isn't done, or that it is wrong, just not common in the aerospace industry.

So if one were correct and the other were out by, say, 6%, then the average level being out by 3% is better than using one instrument that is correct? WALOOB.

Sure you can. You have my permission.

Can you figure out how to avoid the possible interference problems? I don't know. If this was my project I could easily use two gauges but then I'd know the answer to the questions, which level gauges are being used and why two gauges. You see the answer to both of these questions must be known to offer a suggestion on how to proceed.

Better to use 3.

One for low, one for medium, and one for high.

Guided-wave radar gauges should be able to co-operate without interference. Non-contact radar gauges, however, may very well interfere with one another in the same vessel.

We're all wondering, though: why would you wish to use multiple radar gauges in the same vessel?

Our friend is just full of deep insightful probing intelligent.

OK I'm kidding.

Good taste and the desire to not be sent to the naughty step keep me from saying what I really think.

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The already installed Radar is Non contacting type.

And the other one that I need to install shall be in a still well. A still well that is already present in the tank.