ED Electrochemical Detector

Dionex Detectors
Dionex ED Electrochemical Detector

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

Command/Property	Description
CellControl	Turns the cell on and off, or turns the dummy cell on and off.
CellStatus	Reports whether the cell is connected or disconnected.
DataCollectionRate	Sets the rate at which Chromeleon collects digital data points from the detector.
DC_Voltage	Sets the fixed potential applied to the working electrode, in the range of -2.048V to +2.047V.
Electrode	Selects the reference electrode type (AgCl, pH, or PdH).
ElectrodeStatus	Reports whether the electrode is connected or disconnected.
pH	Reports the current pH.
pHAtTime0	Reports the pH at the start of acquisition.
pH.LowerLimit	Sets the lower limit for pH. An error is reported in the Audit Trail if the pH is lower than this value at the start of acquisition.
pH.UpperLimit	Sets the upper limit for pH. An error is reported in the Audit Trail if the pH is higher than this value at the start of acquisition.
EDet1.Mode	Select the operating mode: IntAmp (integrated amperometry), DCAmp (DC amperometry), or Cyclic (cyclic voltammetry). Note: EDet1 is the default name for the first or only ED detector in a timebase. EDet2 is the default name for a second ED detector in a timebase.
Rise_Time	Sets how quickly the detector responds to a change in signal.
Waveform	Define a waveform (a plot of potential vs. time).

Commands for Cyclic Voltammetry (for the 3D_Amp Channel)

Command/Property

Description

CV_CycleTime	Sets the time in seconds for one CV cycle, which is the time it takes to go from the CV Low Voltage to the CV High Voltage and then back to the CV Low Voltage. This creates a triangle Waveform.
CV_LoVoltage	Sets the lowest voltage to be applied during the CV cycle. This voltage begins and ends the cycle.
CV_HiVoltage	Sets the highest voltage to be applied during the CV cycle. This is the peak of the triangle waveform.
CV_Cycles	Sets the number of times to repeat the CV cycle.
StartCV	Starts the CV run.

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

Command/Property

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 indicated range: DC Amp Mode: 0.5 to 20.0 nA/h Int Amp Mode: 0.1 to 100.0 nC/h
*.Value	Reports the current drift 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. 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 indicated range: DC Amp Mode: 0.03 to 0.50 nA Int Amp Mode: 0.005 to 3.000 nC
*.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).