Command/Property

Description

CellOnOff

Turns the analysis cells, which are connected to the detector via a 15-pin Sub-D connector, on and off.

Connect

Operating and controlling the instrument is only possible after a Connect command. Please note that you have to enable remote operation on the instrument itself.

Whenever there is a problem (such as a power failure), the instrument is in an undefined status and must be switched back to remote operation manually.

Connected

Indicates whether the instrument is connected to Chromeleon, that is, under computer control.

Disconnect

Disconnects the instrument from Chromeleon.

RunMethod

Calls a method (1 to 10). If you select current as a parameter, the current, that is, the latest parameter settings are used. Under Mode, select the mode (DC or Pulse).

ScrollView

Scrolls Up or Down to display information (measured values) on the detector display.

StopMethod

Stops the running method.

Command/Property

Description

Autozero

Performs an autozero for the current channel.

DcCellPotential

Defines the potential for the analyitical cell.

DcGuardPotential

Controls the potential of the "Guard Cell". The applied cell potential controls the oxidation or reduction capability potential.

DcRecOutpVolt

Sets the maximum voltage range. You can set six different ranges by specifying the maximum value. If the data is acquired via a Dionex UCI Universal Chromatography Interface, Dionex recommends using the maximum range of the interface (-10 to +10V), that is, to set a voltage range from 0 to +10 or from 0 to -10 V. This improves the signal-to-noise ratio.

It is mandatory to enter a voltage range.

Filter

Defines the filter constant. A lower value ensures that all peaks are visible, however, at an increased noise level. The pseudo peaks that are sometimes visible can make integration and reporting more difficult.

A high value provides chromatograms that look "smooth", but very narrow or closely adjacent peaks may not be visible.

As a rule of thumb, select a filter constant that is not smaller than the width of the narrowest peak.

It is mandatory to enter a filter constant.

Offset

Each signal can receive a channel offset in the DC mode. The entry is in percent, that is, a value of +10 means a signal increase by 10%, depending on the selected voltage range (Output Voltage).

If the voltage range (DcRecOutpVolt) is 0 to +10V, the signal offset is 10% of 10V = 1V.

Range

Sensitivity range of the detector. The range can vary between 100 pico amperes and 100 micro amperes in 19 steps. The smaller the selected range, the larger is the representation of the detected peaks.

Command/Property

Description

AnalytChnRecOutpVolt

Sets the maximum voltage range. You can set six different ranges by specifying the maximum value. If the data is acquired via a Dionex UCI Universal Chromatography Interface, Dionex recommends using the maximum range of the interface (-10 to +10V), that is, to set a voltage range from 0 to +10 or from 0 to -10 V. This improves the signal-to-noise ratio.

It is mandatory to enter a voltage range.

AnalytChnOffset

The signal can receive a channel offset in the Pulse mode. The entry is in percent, that is, a value of +10 means a signal increase by 10%, depending on the selected voltage range (AnalytChnRecOutpVolt).

If the voltage range is 0 to +10V, the signal offset is 10% of 10V = 1V.

AnalytPulseDelay

Time (T1') before actual analysis starts. If T1 was set to 500 ms, T1' can vary between 60 and 490 ms (for example, 300 ms). The stabilization phase should be as small as possible to receive a measuring signal as large as possible in the following analysis phase. At the same time, it must be long enough to ensure that the majority of the capacitive load of the electrode is faded.

AnalytPulseDuration

Time (T1) during which E1 is active on the electrode (for example, 500 ms). The actual measuring phase (M) starts only after the freely selectable stabilizing phase of the electrode (Analytical Pulse Acquisition Delay T1') has passed. The longer T1 is selected, the better the observed signal-to-noise ratio will be and the fewer data points can be collected within a specific time span. There is the risk that adjacent peaks will be insufficiently resolved. Typical value: 500 ms.

AnalytPulsePotential

The potential (E1) used for detecting a substance. The value should reflect the optimum of the substance to be determined.

AutoZeroPulse

Performs an autozero.

CleaningPulseDuration

Sets the time (T2) for which the Cleaning Pulse Potential E2 is active. Typical value: 100 ms.

CleaningPulsePotential

The increased electro-positive potential (E2) that is applied for cleaning the electrode. The value should be close to the oxidative decomposition potential of the mobile phase.

EquilibPulseDuration

Sets the time (T3) for which the Equilibration Pulse Potential E3 is active. Typical value: 100 ms.

EquilibPulsePotential

Strongly reduced potential (E3) for recovering the original status of the electrode. The value should be close to the reductive decomposition potential of the mobile phase.

PulseGuardPotential

Cell potential of the "Guard Cell". The cell potential controls the oxidation or reduction capability potential.