Axis BTA 2100D Instrukcja Operatora Pobierz pdf (Strona 235)

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Click on the Special Application button.

From within the Special Application dialog, one may specify that data should be

acquired in Profile Mode (as opposed to Centroid).

NOTE: Data Handling cannot process a data file collected in profile mode.

Also from within the Special Application dialog, one may specify a pre-

acquisition flow-sampling period.

The Flow Sampling Segment

The flow sampling segment was designed for air monitoring systems, but can be

used for other applications as well. Using the optional hardware to connect the

Electronic Mass Flow Controller (EMFC) readout to the Saturn GC/MS allows the

actual flow rate to be monitored over the sampling interval and recorded in the

data file. The data, sampled at a rate of once per second, is used to determine

the actual sampled volume and is saved as the flow profile. The Method Start

Time includes the time to flush the system, as well as the actual sampling time.

The actual sample volume to be concentrated is determined by the specified

sample flow rate and the sampling duration (start time - end time). The

theoretical and actual sample volume can be viewed in the log file section of the

data file. The flow sampling segment is always performed before the other

segments in the acquisition method, unless its duration is set to zero. Having the

flow sampling segment as a separate segment performed before the rest of the

acquisition makes the chromatographic retention time independent of the

sampling duration: the data system clock is reset when the sampling is

completed. Note that the GC run time is not reset at the end of the sampling

segment.

The flow sampling segment is accessed via the Special Application button. The

flow sampling segment has the following:

 Method Start Time: The time to flush the system before sample collection

begins plus the actual sampling time. Times of -30 to 0 minutes may be

entered.

 Start Time/ End Time: The duration of the actual sampling, from -10.00 to 0

minutes. If the duration of the segment is set to 0, no flow sampling is done.

 Sample Flow Rate: (from 1 to 100 mL/min) If the EMFC is in manual mode,

the sample flow rate must equal the rate set on the EMFC. If the EMFC is set

to auto mode, the sample flow rate specified will be downloaded at the start

of the injection.

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