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DAVID W SPITZER'S E-ZINE (September 2024)


Laser Level Measurement (Part 1 of 2) by David W Spitzer and Walt Boyes

Laser level measurement sensors emit a laser beam towards the material and measure the remnants of the beam that are reflected from the material. These systems determine the location of the material using the time-of-flight that the laser beam takes to travel to and return from the material. The distance between the sensor and the material can be calculated as one-half of the measured time-of-flight times the speed of the laser beam. Mechanical dimensions can then be used to determine the level in the vessel.


Calibration Variables: Positioning Diaphragm Seals on DP Level Transmitters by David W Spitzer

In the last two months, we determined that the capillary tubing for differential pressure measurements should generally be the same length --- even though the added physical length may seem wasteful, expensive and cumbersome.  In particular, we discussed a flow measurement system where the capillary tubes were designed and installed such that their temperatures were often different.  Level measurement using a transmitter with diaphragm seals and capillary tubing can exhibit different problems.


The Weight of Water by David W Spitzer

What is the approximate weight of the water in a full vertical cylindrical tank that is approximately 6 feet (2 meters) in diameter and 20 feet (6 meters) high?  Use pi = 3 for estimating purposes.



In addition to over 40 years of experience as an instrument user, consultant and expert witness, David W Spitzer has written over 10 books and 500 articles about flow measurement, level measurement, instrumentation and process control. David teaches his flow measurement seminars in both English and Portuguese.


Spitzer and Boyes, LLC provides engineering, technical writing, training seminars, strategic marketing consulting and expert witness services worldwide.


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