Oval Engineering Co., Ltd.

Hiroyuki Katougi

Naoki Matubara

A heat-conductive stream pipe has an upstream side and a downstream side temperature-sensing element having resistance wires wound round the pipe at a certain distance there-between to assure that there will be no thermal influence with each other. A control means controls a bridge circuit including a ground point at one end and a connecting point at the other end of each of the temperature-sensing elements so as to keep the temperature difference between the upstream side and the downstream side temperature-sensing elements at a constant level. An adjustable auxiliary heater is placed on the stream pipe at the downstream side near the downstream side temperature-sensing element. The mass flow of the fluid is determined by the voltage measured at the connecting point of the downstream side temperature-sensing element.

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Tokyo, Japan

Hiroyuki Katougi