1993 Volume 42 Issue 4 Pages 209-215
A high pressure tiny pump operatable in a range of (0.5-5) ×105 Pa was needed for gas circulation in the newly developed direct measurement method of radioactivities of gaseous samples, yet, such a pump was not commercially available. A tiny air bubbling pump of electromagnetic vibrating-reed type for small fish raising was remodeled by putting it inside a high pressure stainless steel vessel and vibrating the reed with an electromagnet being set outside the vessel wall. Gas flow rate (Pa·m3/s) was measured at atmospheric pressure both by a method using a measuring-cylinder and by radioisotope (RI) tracer method, and at other pressures by RI tracer method. The flow rate decreased with increasing pressure and viscosity of the gas. The pump was very useful for the present purpose. Details of remodeling and characteristics of the pump are described.
