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DAVID W SPITZER'S E-ZINE (August 2021)

TECHNICAL AND MARKETING SERVICES
FOR INSTRUMENTATION SUPPLIERS AND END-USERS

Contact Level Measurement System Performance (Part 2 of 3)    by David W Spitzer

percentage of measured distance statement describes a parameter that is in error by a constant percentage of the actual distance measurement. For capacitance level measurements, the actual distance measurement is the distance from the bottom of the sensor to the material. For radar level measurements, the actual distance measurement is the distance from the base of the sensor to the material. Therefore, capacitance and radar level measurement systems are bottom-up and top-down measurements respectively.

Flowmeter Billing Errors (Part 3) by David W Spitzer

Assessing the performance of a number of boiler steam flowmeters that were allegedly not accurate because they had not been calibrated for the previous seven years was discussed in a previous column. Removal, inspection and calibration were not possible because the flowmeters could not be taken out of service and the plant refused to calibrate these transmitters containing mercury.

Pump Flow at Reduced Speed by David W Spitzer

Water is pumped up to a tank located 80 feet above a pump rated for 100 gallons per minute at 100 feet of head at 3600 rpm. What is the flow rate when the pump operates at 80% speed?

ABOUT SPITZER AND BOYES, LLC

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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