Abstract: The invention relates to a high accuracy flowmeter for testing and calibrating flowmeters and the like, and more particularly to a positive displacement flowmeter which may include a cylinder (12), a piston (10) within the cylinder (12) which makes a clearance seal with the inside of the cylinder, an encoder (40) associated with the piston, and a control valve (V) for controlling the supply of a fluid flow (A1) to be measured. More generally, the flowmeter includes a channel for receiving a fluid flow so as to move the piston (10) within its enclosure (12); and a device (36, 38, 40) for detecting movement of the piston and generating electrical signals representative of the fluid flow to be measured. The movement of the piston is detected as a function of a known volume of the enclosure traversed by the piston, and a measured variable elapsed time over which the piston traverses the volume. Preferably, the flowmeter system includes a damping device (FIGS. 6A-6D) which may be mechanical, pneumatic, or fluidic.

Abstract: A tube magazine for a sampling system has a plurality of sampler tube receiving spaces for receiving sampler tubes. The sampler tubes can be separated from the system as a unit, and transported to another location for analysis. A first part of the system includes a plurality of introducing devices disposed for introducing gaseous fluid into corresponding ones of the sampler tubes; and a second part which forms with the sampler tubes a replaceable magazine which is readily removable from the first part, whereby the corresponding introducing devices and receiving spaces are simultaneously brought into fluid communication when the first and second parts are connected together.