4 functioning, 1 injection modes, Injection modes – Metrohm 889 IC Sample Center User Manual
Page 27: Figure 12, Pasa, Injection concept
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4 Functioning
889 IC Sample Center
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19
4 Functioning
4.1
Injection modes
Three different injection modes can be utilized:
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Full loop injection: for full precision
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Partial loopfill injection: for full flexibility
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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 tes-
ted concept which combines high accuracy with simplicity and reliability.
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No movement of the sample needle
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Reduced risk of bubbles in the sample intake
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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