Measurement of gas flowrate by using a heat pulse

✍ Scribed by Hae-man Choi; Kwang-Bock Lee; Kyung-Am Park

• Publisher: Elsevier Science
• Year: 1991
• Tongue: English
• Weight: 401 KB
• Volume: 2
• Category: Article
• ISSN: 0955-5986
• DOI: 10.1016/0955-5986(91)90032-m

✦ Synopsis

A heat pulse was used to measure gas flowrate. Direct current was supplied to a manganin wire wound around a stainless steel tube, which was connected at both ends to vinyl tubes in which thermocouples were installed. A switch, amplifier, comparator and timer were used to generate the heat pulse and to measure the transit time, which was strongly dependent on the consumed power rate and pick-up position. As the power rate decreased, the transit time increased. Also, it was found that the pick-up position should be close to the heater to get a short transit time. The linear range with the heat pulse was up to about 1:10 with a standard deviation of 0.042. It is expected that this sensor would make a good flow measurement device with optimization of pick-up position, power consumption rate and heater material.