Abstract Apparatus for measuring a liquid or gaseous fluid by comparison, comprising a duct, means for effecting the automatic rinsing out of the duct by means of a neutral fluid, the filling of the duct with the fluid to be analyzed, and the automatic emptying of the duct into an analyzing receiver, means for checking the filling comprising a valve device automatically put into service during the filling and ensuring that the cycle proceeds or is stopped according to whether the filling is effected or not, and automatically put out of service after a predetermined time interval chosen in such a way that the duct contains none but the fluid to be analyzed, and a device for measuring the fluid contained in the said receiver by comparison.
Apparatus according to claim 1, wherein the analyzing receiver comprises a photometer constituted by a measuring bridge comprising two photoelectric cells connected to an ammeter and between which is disposed a source of light illuminating the cells respectively through a reference ampulla and through a test ampulla containing a reagent, and means for setting the photometer at zero comprising a screw acting on a lever which displaces the light source.
Claim 2
Dependent Claim
20 words
Apparatus according to claim 2, and means to prevent the photometric measurement from being made before any reaction is finished.
Claim 3
Dependent Claim
82 words
Apparatus according to claim 1, wherein the said duct is provided at one end with a two-way valve one way of which serves as inlet for the filling and as outlet for the flushing and the other one of which is connected to the said analyzing receiver, and the other end is connected to a second two-way valve one way of which is connected to a flushing and evacuating pump and the other one of and is connected to an exhaust valve.
Claim 4
Dependent Claim
44 words
Apparatus according to claim 4, wherein the valves are electromagnetic valves and the cycle is controlled by a set of cams actuated by an electric motor, the starting of which is ensured, during the filling operation, by a switch actuated by said exhaust valve.
Claim 5
Dependent Claim
24 words
Apparatus according to claim 4, wherein the duct is coil shaped and formed in a metallic block the temperature of which is maintained constant.