LO-Pulse Pulse Damper

Reduce Baseline Noise — Produce Better Chromatograms

The LO-Pulse® HPLC pulse damper is a patented, wide dynamic range device that smooths pulsations and maintains constant flow at system pressures up to 6000psi.

Key Benefits

• Small volume allows accurate gradients
• Effectiveness at low system pressure
• Wide dynamic range
• Minimal dead volume

Maintain Constant Flow

Constant-displacement reciprocating pumps have intervals in their pumping cycle when flow and pressure momentarily decrease. This "offtime" is the interval when the piston has finished its solvent delivery stroke and is starting to refill. To maintain constant flow, such pumps require a pulse compensator or damper that stores energy during the pumps' delivery stroke and returns an appropriate amount of work to the fluid during the pump offtime.

How the Pulse Damper Works

The damper reduces pulsations by compressing fluid held within a chamber in the unit. This fluid is isolated from the mobile phase by a durable but flexible inert diaphragm. As system pressure increases during the pump delivery stroke, fluid in the chamber is compressed. When the pump begins its refill stroke, the compressed fluid expands, keeping the mobile phase flowing at a nearly constant rate and maintaining system pressure.

At its maximum rated pressure of 6000psi, the volume of mobile phase in the pulse damper is only 0.9ml. The flow path is designed to ensure it is completely swept so that solvent "memory effects" are virtually non-existent when changing mobile phases.