Automatic sample injector

Details Automatic sample injector Automatic sample injector

1996-11-14

1999-03-09

Achutamurthy, Ponnathapura

Chemical apparatus and process disinfecting, deodorizing, preser

Analyzer, structured indicator, or manipulative laboratory...

Sample mechanical transport means in or for automated...

422100, 422105, 422108, 422116, 436 50, 436 54, 436180, 7386481, 7386381, G01N 2100, G01N 100, G01N 3502

Patent

active

058796274

ABSTRACT:
An automatic sample injector for a gas chromatograph includes not only a syringe with a barrel and a plunger which is adapted to move inside the barrel but also a plunger-driving motor for pushing and pulling the plunger inward and outward inside the barrel, a position sensor for the plunger and an abnormality detector for detecting an abnormal operating condition of the plunger. The plunger-driving motor has a variable torque, and it is operated at a preliminarily determined reduced torque smaller than the normal torque at which it is operated under normal conditions. The subsequent motion of the plunger, or lack thereof, is monitored by the position sensor to determine whether the plunger is totally or partially stuck inside the barrel.

REFERENCES:
patent: 4000654 (1977-01-01), Harris, Jr.
patent: 4347215 (1982-08-01), Sisti et al.

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