Peak Triggers (Fraction Collector II)

Use the Peak Detectors table to specify the detection settings of the peak detectors available in your system.

Use	Mark this check box to enable the selected signal for peak detection.
Peak Detector	Displays the module type and serial number of the selected peak detector. Click in the field to change the setting.
Used Signal	Displays the detector signal used for peak detection. If the peak trigger supports more than one signal, click in the field to change the setting.
Peak Detection Mode	Displays the current peak detection mode of the selected peak detector. Click in the field to change the setting. The following modes are available: Off The peak detector is not used. Slope Detects peaks based on slope values only. Threshold Detects peaks based on threshold values only. Threshold and Slope Detects peaks based on both threshold and slope values.
Threshold	The height of the peak that triggers collection
Up Slope	The slope of the rising peak. The slope value is based on the first derivative of the signal.
Down Slope	The slope of the falling peak. The slope value is based on the first derivative of the signal.
Upper Threshold	If the peak detection mode is Slope or Threshold and Slope, peak splitting or detector noise might cause unwanted detection of fractions or too many small unnecessary fractions to be collected. To avoid this, set an upper threshold above which slope-based peak detection is disabled. The value of the Upper Threshold must be greater than that of the Threshold.
Limit Peak Duration	Mark this check box to set a maximum duration for a peak. When this check box is marked, the Max. Peak Duration parameter is enabled.
Max. Peak Duration	The maximum amount of time a peak trigger remains active. When the Max. Peak Duration elapses, if the signal level is still above the threshold, a new peak trigger is activated. At each Max. Peak Duration, further peak triggers are activated until the signal drops below the threshold.

Use MSD for mass-based Fraction Collection

If you have an MSD installed, mark this check box to activate the MSD as a digital peak trigger for fraction collection. This parameter is present only when the MSD Installed check box in Configuration is marked.

For triggers using a digital signal, no additional settings are possible.