| 摘要 |
<p>PURPOSE:To accelerate response speed by eliminating zero-point variation, by installing heat-sensitive coils changing their resistance value according to liquid temperature on upper and lower reach of a pipe passing the fluid, controlling temperature of both coils and detecting a difference of given energies. CONSTITUTION:A pipe 1 allows passage of fluid G, such as gas, etc. in the direction of an arrow. Two points set apart by a proper distance in the pipe 1, heat-sensitive coils Ru, Rd are placed, these coils Ru, Rd being of temperature sensitive resistance wires of high temperature coefficient, such as those of Fe, Ni-alloys, etc. Constant temperature circuits Tu, Td are provided with coils Ru, Rd respectively, made of the same component parts and coils Ru, Rd are so made that they are always alike and held at the constant temperature. Thus, a difference of energies supplied to the circuits Tu, Td from the DC power sources 40, 40' is detected and a signal proportional to a mass flow rate flowing in the pipe 1 is obtained by an output current K of an output circuit 50. Thus, the mass flow rate of rapid response can be measured by eliminating variation of zero points.</p> |
