￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
4 Functioning
889 IC Sample Center
￭￭￭￭￭￭￭￭
19
4 Functioning
4.1
Injection modes
Three different injection modes can be utilized:
￭
Full loop injection
: for full precision
￭
Partial loopfill injection
: for full flexibility
￭
Pickup injection
: for smallest loss of sample
The sample loop injection with pressure-assisted sample aspiration =
PASA
™
can be used with all three injection modes. This is a tried and tested
concept which combines high accuracy with simplicity and reliability.
￭
No movement of the sample needle
￭
Reduced risk of bubbles in the sample intake
￭
No wearing or contamination of the injection port
1
2
3
4
5
Figure 12
PASA
™
injection concept
1
Buffer loop
2
High pressure pump
3
Separation column
4
Sample loop
5
Compressed air
The syringe aspirates the sample out of the sample vessel and into the sample
loop. The buffer loop between the syringe and the injection valve prevents
the contamination of the syringe. Washing solution is required in order to:
Summary of Contents for 2.889.0010 889
Page 1: ...889 IC Sample Center Manual 8 889 8001EN...
Page 2: ......
