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DAVID W. SPITZER'S E-ZINE

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This issue sponsored by Spitzer and Boyes, LLC

November 2011

Ultrasonic Level Measurement (Part 2 of 3)

Many ultrasonic sensors have integral temperature sensors to compensate for the effects of vapor temperature on the measurement. Recognizing that the sensor temperature may not be representative of the vapor temperature in the vessel, some ultrasonic level gauges can use external vapor-space temperature measurement(s) for compensation. click for more...

Analog Signal Conversion:
Understanding the Accuracy of DCS & PLC Inputs

Doing something and doing it right can often be two different things. Consider the case of converting an analog signal from a flowmeter so that it can be displayed and/or totalized. Years ago, the analog signal was recorded on a circular chart recorder or strip chart recorder that may have included an integral totalizer. click for more...

What Is the Flowrate of a Pump Operating at 60% Speed?

A centrifugal pump is designed to operate at a water flow of 100 liters per minute and pressure of 100 meters of water column at full speed. What is the approximate flowrate if the pump is operated at 60 percent speed? click for more...

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