Relay-controlled Gradient

Use the Relay-controlled gradient to control relay-controlled low-pressure pumps for which a separate device is not available. This requires the relays of a relay card or a UCI Universal Chromatography Interface.

As usual, the solvent composition is defined as a percentage in the PGM File. Each solvent component is controlled by a separate relay. The length of time for which the corresponding relay is open determines how the solvent is mixed.

Use the Cycle time parameter on the Solvents tab page in the Server Configuration program to specify the cycle duration; that is, the time period from when delivery of the first solvent starts until the delivery of the last solvent is complete. The shorter the cycle is, the more homogeneous the solvent. The longer the cycle is, the more precise the solvent composition.