CD Conductivity Detector

Dionex Detectors
Dionex CD Conductivity Detector

In addition to the standard commands available for all detectors (see Dionex Detectors), the CD provides special commands (see the table below; please note that the display Filter level determines which commands are displayed).

Command	Description
DataCollectionRate	Sets the rate at which Chromeleon collects digital data points from the detector.
PressureStatus	Reports the status of the pressure sensor (over pressure or not over pressure).
Rise_Time	Sets how quickly the detector responds to a change in signal.
Temperature_Compensation	Sets the temperature compensation factor, which is used to stabilize conductivity readings.

Cell Heater Commands

Command	Description
CellHeater.Mode	Selects whether the cell heater is on or off.
CellHeater.Status	Reports whether the cell heater is under the set temperature, at the set temperature, or over the set temperature.
CellHeater.TemperatureActual	Reports the actual temperature.
CellHeater.TemperatureSet	Sets the temperature of the cell heater.
CellHeater.TemperatureState	Reports the state of the cell heater (Ready or NotReady).

Analog Output Commands (Available only if I/O option is installed)

Command

Description

Full_Scale	Sets the full-scale analog out voltage.
Mark	Sends a positive pulse to the detector’s analog output as an event marker.
Offset_Level	Sets the offset for the analog output signal.
Polarity	Switches the analog output polarity (+/-).
Recorder_Calibration	Calibrates a recording device. Zero sets the output signal to zero volts. Full Scale sets the output signal to the selected full-scale voltage (10, 100, or 1000 mV). Normal (the default) outputs a signal corresponding to the detector output.
Recorder_Range	Sets the range of a full-scale recorder response.

Equilibration commands and properties

Tip:

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 in the range: 0.00005 to 50.00000 mS/h.
*.Value	Reports the current drift value in mS/h (read-only). 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 PreconditionLog (Preconditions) of the subsequent samples.
DriftEquilibration	Reports the status/result of the drift measurement: OK or NotOK (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. The current data is outside the specified limits.
	Good	Equilibration is running or has finished. The values are within the specified limits.
	Failed	Equilibration is completed. The result is outside the specified limits.
	NotTested	An upper limit was not set (drift testing was disabled).
Equilibration	Provides information about the total status of the equilibration: OK or NotOK (read-only).
Noise	Provides information on the detector Noise.
*.UpperLimit	Sets the upper noise limit in the range: 0.00003 to 0.05000 mS.
*.Value	Reports the current detector noise value (read-only). 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: OK or NotOK (read-only).
NoiseStatus	Reports the status/result of the noise measurement (read-only). For the available values, see DriftStatus.
StartEquilibration	Starts equilibration (noise/drift measurement).