PURPOSE: To measure low flow rate with high accuracy without contact with fluid by applying specified heat from the outer side of a pipe in which the fluid flows and determining the flow rate of the fluid flowing in the pipe from the change in the temp. of the pipe.
CONSTITUTION: Fluid such as water is made run in an arrow direction in a pipe 1 provided with a heat insulating material 6, and electric current is supplied intermittently to a heater 2 from a regulated power supply 3 to allow the heater 2 to generate heat intermittently. The temp. of the pipe 1 of this time is measured at contact points A, B for measuring temp. and the change in the temp. thereof is recorded with time with a temp. indicator 5. For example, if the volume of one liquid drop is calibrated beforehand with respect to liquid which drops in the form of liquid drops in a small amt. from a pipe mouth 1a, the number of dropping is determined from the number of periods of pulsation in the temp. change, whereby flow rate is determined.
TANAKA HIROSHI
ARAKAWA YOSHIAKI
TANAKA HIROSHI
SHOWA DENKO KK
| JPS5022659A | 1975-03-11 |