Command/Property

Description

%A, %B, %C

Indicates the partial flow of a solvent component, expressed as a percentage of the total flow.

*Value

Current value [%] for components A, B or C

*Equate

Name of the component (A, B, or C). Note: Default component names can be specified in the Properties dialog (Solvents (Loading) tab page) for the pump  in the Server Configuration program.

Curve

Determines the curvature for flow gradients (see Gradient Curves).

Flow

Sets the flow rate [ml/min]. This is the total flow through the pump.

*Nominal

Sets the nominal flow.

*Value

Reports the current flow.

FlowMode

Reports the current flow mode of the pump (Stopped, Running, Hold, Purge, Park).

HeadType

Indicates the head type of the pump (Micro).

MaximumFlowRampDown

Sets the upper limit for the flow rate deceleration.

MaximumFlowRampUp

Sets the upper limit for the flow rate acceleration.

Motor

Turns the motors of the pump on or off.

Pressure

Reports the pressure.

*Value

Reports the current pump pressure.

*.LowerLimit
 

Sets the lower pressure limit. The pump will stop the flow if the pressure is below the lower limit.

Note: If you want to use the new limit as standard, consider changing the value in the Properties dialog (Limits tab page) for the pump in the Server Configuration program. If you want to change the limit only for a specific application, change the value here. This will not change the setting on the Limits page.

*.UpperLimit

Sets the upper pressure limit. The pump will stop the flow if the pressure exceeds the specified value.

Also, see Pressure.LowerLimit.

Purge

Set to On to start purging of the pump. Also, see PurgeTime and PurgeFlow.

PurgeFlow

Enter the flow [in mL/min] to be delivered by the pump during purging. Also, see Purge and PurgeTime.

PurgeTime

Specify how long purging shall be performed [s]. Also, see Purge and PurgeFlow.

Ready

Reports whether the device is ready to operate (Ready or NotReady).

StaticMixer

Sets and displays the volume of the inline filter. Verify that the property is set to the value indicated on the inline filter. If the property is not set to the correct value, the leak tests may not provide reliable results.

AcqOn/AcqOff

AcqOn starts data acquisition. AcqOff terminates data acquisition.

Average

Averages all measured values.

Delta

Reports the signal slope, that is, the difference between the value and the value 1 second ago. This is useful for Triggers.

Equilibration

Reports the equilibration status.

MaxAutoStep

Sets the maximum step rate for Step = Auto.

Retention

Indicates the retention time for the signal.

Ripple

Reports the ripple of the pump pressure.

*Value

Reports the actual value. 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.

If the average pressure is below 10 bar, the ripple measurement is started again.

The value of the property does not change after the measurement and is displayed under Preconditions.

*UpperLimit

Determines the upper limit for the ripple of the pressure signal in [%]. The upper limit can be any value between 1.0% and 5.0%. The default setting is 3.0%.

RippleStatus

Reports the ripple equilibration status of the pump pressure (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.

Good – Equilibration is running or has finished. The values are within the specified limits.

NotReady – 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, thus disabling ripple checking.

Signal

Reports the current pressure signal.

StartEquilibration

Starts equilibration. For more information, refer to How to ...:  Equilibrating the Chromatography System.

Step

Sets the step for data acquisition.

Command/Property

Description

MixerFritChanged

Perform this command after you have replaced the inline filter to update the related Value property and the MixerFritChangeDate.

MixerFritChangeDate

Reports the date when a new inline filter was installed.

MixerFritWorkload

Reports the workload (measured pumped volume) of the inline filter.

*.Value

Reports the total workload of the inline filter since the last service.

*.Warning

Specifies the volume [l] after which a warning appears to indicate that service of the inline filter is due. If set to "0", no warning appears.

*.Limit

Specifies the volume [l] after which an error is issued to indicate that service of the inline filter is due. If set to "0", no error message is issued.

SelfTest

Perform this command to start a self-test for the pump.

Note: You cannot start a second test while the first test is still running.

SelfTestPassed

Reports whether the pump passed the test.

Note: You can start a batch only if the test was successful. If the test failed, check the pump and repeat the test.

Command/Property

Description

CheckValveService

Reports service information about the check valve.

*.LastDate

Reports the date when the check valve was serviced last.

*.Interval

Specifies the interval (in days) when the next service for the check valve is due. When the specified limit is reached, a warning appears. If set to "None" no warning appears.

*.WarningPeriod

Specifies the period during which a warning appears before the next service is due. If set to "None" no warning appears.

CheckValveServiceDone

After you have replaced the check valve, perform this command to update information of the associated LastDate property.

Compression

Displays the compression value of the pump head (compression of the last stroke).

Note: The compression value can provide valuable information for troubleshooting. For details, refer to the operating instructions for the NCS.

DockPistons

Perform this command for the pump head for which you have replaced the pistons or piston seals. The command returns the pistons into the appropriate position for normal operation. Wait until the PistonPositionStatus property reports Operational before you resume operation.

PistonsChanged

After you have replaced the pistons of the pump head, perform this command to update the information of the associated PistonWorkLoad counter.

PistonChangeDate

Reports the date when the pistons were changed last.

PistonPositionStatus

Reports the position of the pistons in the pump head (also, refer to DockPistons and UndockPistons):

AutoLubricating/Lubricating: The pistons are being lubricated. It is not possible to start the flow or run a batch.

ErrorLubricating: Indicates a problem during lubricating of the pistons.

ErrorUndock/ErrorDock: Indicates a problem during execution of the UndockPistons or DockPistons command, respectively.

Operational: The pistons are in the appropriate position for  normal operation.

PrepareUndocking: The pistons are moving into the appropriate position for piston and piston seal replacement. During this time, it is not possible to start the flow or run a batch.

PrepareDocking: The pistons are returning to the appropriate position for normal operation after they were undocked for piston or piston seal replacement. During this time, it is not possible to start the flow or run a batch.

Undocked: The pistons are in the appropriate position for piston or piston seal replacement.

Unknown: The current position of the pistons is unknown.

PistonWorkload

Provides information about the workload of the pistons in the pump head.

*.Value

Indicates the current workload [MJ] of the piston pump head (read-only).

*.Warning

A warning appears when the value specified here is reached. If set to "0" no warning appears.

*.Limit

A warning appears when the specified limit is reached. If set to "0", no error message is issued.

SealChangeDate

Reports the date when the related piston seal was replaced last.

SealWorkload

Counts the workload [MJ] of the related piston seal since the seal was replaced last.

*.Value

Reports the current workload of the piston seal since the seal was replaced last.

*.Warning

A warning appears when the specified value is reached. If set to "0", no warning appears.

*.Limit

An warning message appears when the specified value is reached. If set to "0", no error message is issued.

SealChanged

After you have replaced the seals of the pump head, execute this command to update information of the associated SealWorkLoad counter.

SupportRingChanged

After you have replaced a support ring in the pump head, perform this command to update the information of the associated SupportRingWorkLoad counter.

SupportRingChangeDate

Reports the date when the support ring in the left or right pump head was changed last.

SupportRingWorkload

Provides information about the support ring workload.

*.Value

Indicates the number of strokes of a pump head since the last change of the support ring (read-only).

*.Warning

A warning appears when the value specified here is reached. If set to "0" no warning appears.

*.Limit

A warning appears when the limit specified here is reached. If set to "0", no error message is issued.

UndockPistons

Moves the pistons of the pump head into the appropriate position for piston or piston seal replacement.

Wait until the PistonPositionStatus property reports Undocked before you start the replacement procedure.

WorkLoad

Reports the total workload [MJ] of the pump head since initial operation of the module. The value is automatically reset after a pump block has been replaced.