Performing A Compression Check; Purge Time Examples - Waters 717plus Operator's Manual

Table 4-3 lists sample purge times for the two sample loops at selected flow rates.
Table 4-3 Purge Time Examples
Sample Flow Rate
Loop (mL/min)
Normal 0.2
0.5
>1
Auxiliary 0.5
1
2

4.5.3 Performing a Compression Check

The compression check tests for gas in the mobile phase, and, when enabled, occurs
immediately after a purge. For most mobile phases, use the default parameters.
Note: The compression check is only valid using the standard 250 µL syringe and 200 µL
sample loop.
Change the default parameters if:
• Mobile phase is highly compressible (see
Degassing).
• Testing for leaks (see
Compression Parameters
When enabled, the compression check is executed immediately after a purge. The
parameters are:
• Compression PressureComression Pressure
• Pressure Decay Time
• Compressible Volume
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
Purge Time
(min)
12.5
5.0
2.5
19.4
9.7
4.8
Appendix D, Reproducibility and Solvent
Section 6.4.2, Valve Leak Test).
Ensuring Reproducibility 84
4