FIELD: measurement technology. SUBSTANCE: washing unit has hollow checker 10 put on case of injector 5 on side of inlet of piston 8. Washing fluid goes from vessel 12 through space 11 of checker 10 which presents clearance between butt of piston 8 and upper boundary of working space 6 of injector 5 into space 6 and passes through needle 7 into container 2 for discharge of washing fluid flowing about surface of piston 8, working space 6 and space of needle 7 of injector 5. EFFECT: increased quality of injected sample and reliability of device. 2 dwg
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