UltiMate 3000 Series DAD and MWD Detectors: Commands and Tips

Dionex Detectors
Dionex UltiMate 3000 Series DAD and MWD Detectors

In addition to the General Device Commands, the commands listed below are available for the DAD-3000(RS) and MWD-3000(RS) detectors. Please note that the display Filter level and detector type determine which commands and properties are displayed. In addition to these parameters, there are a number of read-only properties that give information about the detector.

3DFIELD channel commands (DAD only)

Command/Property	Description
AcqOn/Off	Start/stop data acquisition.
BunchWidth	Determines the range that is averaged when collecting 3D data (similar to the Bandwidth of a UV_VIS channel). The default BunchWidth is 1 nm. A higher BunchWidth reduces the required data storage and improves the signal-noise-ratio, but reduces the Optical Resolution. Note: Only integer values are accepted. If you enter a decimal value, Chromeleon automatically rounds to an integer value.
MaxWavelength	Sets the maximum wavelength for recording spectra. Narrows the range in which the 3D field is recorded (also see MinWavelength).
MinWavelength	Sets the minimum wavelength for recording spectra. Narrows the range in which the 3D field is recorded (also see MaxWavelength).
RefBandwidth	Averages several photodiode signals of the reference signal. It is not necessary to select a reference bandwidth unless a reference wavelength is set.
RefWavelength	Corrects the 3D field absorption values. The selected reference wavelength should be in a quiet area of the spectrum where little absorption occurs.
Retention	Reports the retention time of the signal (read-only).

UV_VIS channel commands

Command/Property	Description
AcqOn/Off	Start/stop data acquisition.
Bandwidth	Specifies the optical bandwidth at which a chromatogram is recorded.
Delta	Indicates the signal slope, that is, the difference between the current value and the value one second ago; this is useful for Triggers.
RefBandwidth	Serves to average several photodiode signals of the reference signal. It is not necessary to select a reference bandwidth unless you enter a RefWavelength.
RefWavelength	The reference wavelength Is used to correct the absorption values of the wavelength that has been selected for the analysis. The selected reference wavelength should be in a quiet area of the spectrum where little absorption occurs.
Retention	Reports the signal's retention time (read-only).
Signal	Reports the current signal value [mAU] (read-only).
Wavelength	Sets the wavelength for recording the signal on the UV_VIS channel to the wavelength with the absorbance maxima for the analytes of interest. (The available range is from 190 to 800 nm).

Equilibration commands and properties

Use the equilibration commands and properties only for the SmartStartup feature.

Command/Property	Description
Drift	Provides information about the detector Drift, determined by equilibration.
*.UpperLimit	Sets the upper drift limit [mAU/h].
*.Value	Reports the current drift value in mAU/h. The value is calculated as soon as at least a one-minute segment was measured. It is updated with each new recorded segment and averaged over the last 5 minutes. The property value does not change after measurement and can be viewed in the Precondition Log (Preconditions) of the subsequent samples.
DriftEquilibration	Reports the status/result of the drift measurement (read-only).
DriftStatus	Reports the status/result of the drift measurement (read-only).
	N/A	Equilibration has not started.
	Measuring	Equilibration is running, but the amount of data is not yet sufficient to report a result.
	NotReady	Equilibration is running or has finished. The values are within the specified limits.
	Good	Equilibration is running. The current data is outside the specified limits.
	Failed	Equilibration is completed. The result is outside the specified limits.
	NotTested	The limit was set to 0, drift measurement is disabled.
Equilibration	Provides information about the total status of the equilibration (read-only).
Noise	Provides information about the detector Noise.
*.UpperLimit	Sets the upper noise limit in [mAU].
*.Value	Indicates the current detector noise. The value is calculated as soon as at least a one-minute segment was measured. It is updated with each new recorded segment and averaged over the last 5 minutes.
NoiseEquilibration	Reports the status/result of the noise measurement (read-only).
NoiseStatus	Reports the status/result of the noise measurement (read-only).
StartEquilibration	Starts equilibration (noise/drift measurement).

General detector commands

Command	Description
Alarm	Reports a pending leak alarm. Default value: Off.
AlarmOff	Resets a pending alarm and turns off the beep.
AutoactivateUV_Lamp	On: The UV lamp is turned on automatically whenever the detector is powered up.
AutoactivateVisible_Lamp	On: The visible lamp is turned on automatically whenever the detector is powered up.
Autozero	Performs automatic null balancing (= the current detector signal is interpreted as 0).
Brightness	Adapts the screen brightness of the detector.
ClearDisplayError	Removes a message from the detector display.
Contrast	Adapts the screen contrast of the detector display.
Data_Collection_Rate	Enter the rate [Hz] at which Chromeleon collects digital data from the detector. Note that Chromeleon selects the best step rate for the UV_VIS signals dynamically. Sample values are averaged over the step interval.
DemoFileName	File name of the demo file (may contain %d, which will be replaced by the sample number).
LeakSensorMode	Activates or deactivates leak detection. Enabled (default and recommended): Activates leak detection. A beep alerts you when the leak sensor reports a leak. . Disabled: Deactivates leak detection. The leak sensor status is written to the Audit Trail, but no message appears and no beep sounds.
ResponseTime	Specify the Response Time for the signal. The response time is the time required for the detector signal to rise from 10% to 90% in response to a signal increase. The value calculated by Chromeleon is only a recommended value. You are free to select a different value as appropriate for your application. Tip: The response time should be approximately 25% of the peak width at half height of the narrowest peak of interest.
SetFactoryDefaults	Restores the Dionex standard settings.
SlitWidth	(RS versions only) Select a slit width for the variable slit. A narrow slit means a smaller optical bandwidth, but provides a high optical resolution that is required for analytes with a very fine spectral structure. As more light is available for the detection with a wide slit, the baseline noise is reduced. However, the optical resolution diminishes.
Standby	Sets the detector to standby mode or cancels standby mode. During standby mode, the detector remains connected in Chromeleon.
UV_Lamp	Reports the state of the UV lamp. To turn on the deuterium lamp, set UV_Lamp to On.
Visible_Lamp	Reports the state of the visible lamp. To turn on the visible lamp, set Visible_Lamp to On.

UV calibration and validation commands

Command	Description
WavelengthCalibration	Performs wavelength calibration via the deuterium lamp.
WavelengthPeak1/2.../7 Measured	Reports the measured wavelength for the related peak.
WavelengthPeak1/2.../7 Theoretical	Reports the wavelengths expected for the related peak when the wavelength verification test is performed via the Holmium Oxide Filter.
WavelengthValidation	Performs an internal wavelength validation procedure using the holmium filter.

System Wellness and Predictive Performance commands and properties

Tip:

The Chromeleon version and detector type determine which commands and properties are available for checking the detector's system wellness and performance.

Command/Property	Description
CellChangeCount	Reports the number of times that the flow cell has been changed.
LastUVLampChangeDate	Reports when the UV lamp was replaced last (read-only).
LastVISLampChangeDate	Reports when the visible lamp was replaced last (read-only).
OperatingHours	Counts the operating hours since initial operation (excluding the operating hours in standby mode (read-only).
PowerOnTime	Counts the time since last power-up (or last wake-up from standby) (read-only).
PreviousUVLampOperation Time	Reports the operating hours of the previously installed UV lamp (read-only).
PreviousVISLampOperation Time	Reports the operating hours of the previously installed visible lamp (read-only).
Qualification	Provides information about system qualification.
*.LastDate	Reports the date when detector qualification was performed last (read-only).
*.LastOperator	Reports the name of the person who performed the detector qualification (read-only).
*.Interval	Reports the interval (in days) when the next system qualification is due.
*.WarningPeriod	Specifies the period during which a warning appears before the next qualification is due.
*.GracePeriod	Indicates the period during which the device may be operated after the due date for re-qualification.
QualificationDone	Perform this command after qualification to update the related system data.
Service	Provides detector service information.
*.LastDate	Reports the date of the last service (read-only).
*.Interval	Specify the interval (in days) after which a service is due.
*.WarningPeriod	Specifies the period during which a warning appears before the next service is due.
ServiceDone	After the device has been serviced, perform this command to update the related information.
SlitChangeCount	(RS versions only) Reports the number of times that the slit width has been changed.
StandbyHours	Counts the total operating hours in standby mode since the module was operated for the first time (read-only).
UVLampIgnitions	Counts the total number of successful UV lamp ignitions (read-only).
UVLampIgnitionCurrent Trials	Reports the number of ignition trials when the UV lamp was started last (read-only).
UVLampIgnitionFailures	Counts how many times the UV lamp ignition fails (read-only).
UVLampIntensity	Reports the UV lamp intensity at 254 nm in counts per second (read-only).
UVLampOnTime	Counts the operating hours of the UV lamp since the lamp was ignited last (read-only).
UVLampOperationTime	Provides information on the UV lamp's operating time.
*.Value	Reports the total operating hours of the UV lamp (read-only).
*.Warning	A warning appears when the specified value is reached.
*.Limit	An error message appears when the specified value is reached.
VISLampIgnitionFailures	Counts how many times the visible lamp ignition fails (read-only).
VISLampIgnitions	Counts the total number of successful visible lamp ignitions (read-only).
VISLampIntensity	Reports the VIS lamp intensity at 700 nm in counts per second (read-only).
VISLampOnTime	Counts the operating hours of the visible lamp since the lamp was ignited last (read-only).
VISLampOperationTime	Provides information on the visible lamp's operating time.
*.Value	Reports the total operating hours of the visible lamp (read-only).
*.Warning	A warning appears when the specified value is reached.
*.Limit	An error message appears when the specified value is reached.

Analog output commands and properties

The following commands and properties are available only if the DAC plug-in module is installed and the DAC Board check box is selected in the Properties dialog for the detector (Detector tab page) in the Server Configuration program.

Property	Description
Analog1_Offset Analog2_Offset	Adjusts the zero position of the analog output when it is plotted. The value entered is a percentage of the full-scale analog output. The offset allows the evaluation device to plot the signal if it becomes negative. Note: The output voltage of the analog outputs cannot reach a minimum of exactly 0 V. Therefore, we recommend to set an offset of at least 5 %, even if only positive analog output signals are expected. This will enable you to also measure very small output signals down to 0 precisely.
Analog1_Range Analog2_Range	Sets the voltage range of the analog output signal. The range to use depends on the evaluation device to which the output is connected.
Analog1_Resolution Analog2_Resolution	Sets the resolution of the analog output signal. The resolution to use depends on the value expected for the application.

For PCM-3000 pH and conductivity monitor commands and properties, refer to UltiMate 3000 Series VWD, DAD and MWD Detectors: pH and Conductivity Monitor Commands.

For information about how to install the detector, refer to Hardware Installation UltiMate 3000 Series - Diode Array Detectors