| 摘要 |
<p>A sample duct (12) in a carrier line (10) is isolated by three-way valves (14, 16) blocking the flow of carrier or flushing liquid from reservoirs (24, 26). The sample duct (12) may be connected to a loading syringe (18) and to a sample reservoir (17) respectively by the valves (14, 16). When the sample duct (12) is connected into the carrier line (10), pressurised carrier fluid may convey the sample for analysis through a manifold (38) comprising valves (40) through which reagents may be introduced from reservoirs (42). The sample then passes through a thermostatically controlled reaction tube (46) to a valve (50) which switches it between waste and an outlet (48) leading to a detector for analysis. The carrier and flushing fluids and the reagents are pressurised by gas from an inlet (30) which is conveyed via an overpressure vent (32) to the reservoir (24, 26, 42) by lines (28, 44). Rigid inert tubing is used throughout the carrier line (10), sample duct (12), manifold (38) and reaction tube (46).</p> |
