Posts Tagged TVT

The Impact of Background Echoes on Ultrasonic Level Measurement

Photography is a pretty good way to illustrate the importance of background.

Look at the two photographs here. In one, the background is minimal, and focuses your eye on the subject matter. In the other, the background seriously detracts from the subject. Where should you be focusing? What’s most important?

Non-intrusive background makes focus point clear

Hard to discerne the difference between the action and all the stuff happening in the background

 

But unlike photography, where a good background helps you focus on the subject, in the world of non-contact ultrasonic level measurement, even a “good” background has a negative influence.  Background never contributes to a level reading, it only detracts. But Siemens has a built-in function to “cure” for the influence of backgrounds in their level devices. Read the rest of this entry »

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Challenge moving a Siemens radar level gauge

Ran into a situation last week that taught me an important lesson.

A customer took a tank out of service for major repairs, so they moved the Siemens radar level transmitter to a different tank.   Even though the radar unit performed flawlessly on the first tank, they ran into difficulty getting the correct level readout in its new installation.  

The mechanical guy had moved and remounted the transmitter.   The I&E tech had wired it correctly, and then did a master reset before starting a fresh configuration.  After going through the configuration, he couldn’t get a valid level readings in the upper fourth of the tank level.

The second tank was near its full level and the technician (properly) wanted to wait to do an Auto-Learn scan until the tank level approached empty.  In the meantime, we were all scratching our heads trying to figure out why the upper level readings were not correct.  

In frustration, I finally resorted to pulling out a manual . . . Read the rest of this entry »

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