Hitachi CHROMASTER 5160 Instruction Manual page 813

Syringe valve
4
Plunger
wash
va/2
Syringe
Wash
fluid1
(4)
Buffer tube
Injection valve
3 2
1
5
Wash
pump
P
Degassing
unit
Wash
fluid2
Wash of the needle outer wall with the wash fluid1
The syringe aspirates one-half of the air volume (:va/2) while
needle is moving to the wash port.
Deliver the wash fluid1 via the wash pump to wash the needle
outer wall.
5
Loop
6
Waste
1
solution
From Pump
To Column
vd :Dead volume (the instrument inside parameter)
vi :Injection volume (the sample net volume to the flow path)
vl :Lead volume (forward part, cut volume)
vr :Rear volume (rearward part, cut volume)
va :Air volume (the air volume which sample is sandwiched.)
2 - 17
Needle
Injection port
va/2
4
3
Waste
2
solution
Wash port
Rack
Sample