| Vol.3 No.4 Subject: Flow Measurement News Date: 9-4-01 From: McCrometer, "The Flow Measurement Specialists" ........ http://www.mccrometer.com ........ ******************************************* This newsletter is e-mailed by McCrometer monthly to subscribers worldwide. It consists of flow measurement information of interest for professionals in this field. For More information on our complete line of flowmeters go to: http://www.mccrometer.com ******************************************* Ask The Experts... McCrometer September 2001 Newsletter The Nuts and Bolts of Flowmeter Testing Buying a flowmeter that hasn't been tested is like going on a blind date. You just don't know what to expect. That's why testing is critical to a flowmeter's success. It reduces the uncertainty of the meter and detects flaws that might otherwise go undetected. Equally important, it helps to determine the meter's performance under application conditions, so a specific meter can be characterized more precisely. Put simply, testing improves flowmeter accuracy. Testing can be performed using a multitude of methods, but for the types of flowmeters manufactured by McCrometer, the volumetric and gravimetric are the most appropriate. At a volumetric facility, the volume of water discharged through the test line is determined by measuring the volume of the reservoir between two signal switches. The first switch starts the test, the second stops the test. The elapsed time and the accumulated clicks on the counter are recorded and compared to the known reservoir volume to give the meter factor for the meter. Gravimetric facilities, on the other hand, run at a continuous rate of flow through the test line. The test is initiated by diverting flow into a tank while it is still flowing though the meter. The test is completed by diverting the flow away from the tank. The elapsed time is recorded and the average or mean signal from the flowmeter during the test is recorded. Also, the amount of fluid diverted into the tank is weighed. Comparing the average or mean signal from the meter to the mass of fluid collected over the time period gives the meter factor for the meter. McCrometer knows how important testing is to successful flow measurement and rigorously tests every one of its flowmeters before they leave the factory. The company's testing facilities include both a large volumetric calibrating facility and a gravimetric laboratory. For more information about flowmeter testing, contact your McCrometer flowmeter expert at 951-652-6811. ******************************************* Copyright 2001 McCrometer ******************************************* Know anyone looking for a steady dose of flow measurement information? ****************************************** To subscribe send e-mail to <mailto:news-request@mccrometer.com>news-request@mccrometer.com with a keyword SUBSCRIBE in the subject field. To unsubscribe, send e-mail to <mailto:news-request@mccrometer.com>news-request@mccrometer.com with a keyword REMOVE in the subject field. ******************************************* To subscribe or unsubscribe online, please go to our website at: http://www.mccrometer.com/subscribe.htm ******************************************* Distributed by McCrometer "The Flow Measurement Specialists" http://www.mccrometer.com |