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DAVID W. SPITZER'S E-ZINE

TECHNICAL AND MARKETING SERVICES
FOR INSTRUMENTATION SUPPLIERS AND END-USERS

This issue sponsored by Spitzer and Boyes, LLC

March 2010

Fieldbus Technology (Part 3 of 5)

HART began as an ISA SP50 proposal to enable backwards compatibility with analog field instrumentation. HART transmits its digital data superimposed on a 4-20 mA signal allowing the field instrument to continue to supply its primary data value in analog form with secondary data in digital format. click for more...

Inspector Clou'fleau'
An Application In Conflict Provokes an Investigation

Sometimes you have to do detective work in order to really know what you have -- or you may suffer the consequences. click for more...

Effect of Bubble in Impulse Tubing

What is the approximate flow measurement error associated with a differential-pressure flowmeter for liquid service operating at a pressure of four bar where the differential-pressure transmitter is calibrated for 100 inches of water column, and the impulse tubing on the high side of the transmitter has a 10-inch vertical bubble of non-condensable gas? click for more...

 

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