CEMS liquid waste removal pumps

Within CEMS, the analyser should be protected from contamination due to condensed liquid and particulates as they can block flow passages and components, obscure optical sensors and lenses and ultimately cause widespread corrosion. The sample gas is often filtered and conditioned to remove these components whilst maintaining the integrity of its gaseous composition. The waste liquid removal system should be well sealed to prevent air ingress and have excellent chemical and abrasive resistance.

Longer peristaltic pumps can effectively seal the tubing without the need for valves, even when the pump is inactive. This sealing capability is applicable to gas, liquid or multi-phase fluids. Premier Control Tehnologiecs’ (PCT) pumps have good self-priming capability and are still effective when pulling against vacuum. They can be fixed speed for stable continuous flow rates or they can be variable speed for more complex systems. There are numerous control modes including digital and analogue communications for integration into both new OEM and older existing systems.

As the condensed liquid only contacts the bore of the tubing there are no issues with chemical compatibility of the pump unit itself. The selection of the correct tubing is therefore an important consideration. This applies equally to selection for abrasive resistance with soft particles acceptable to 25% of tubing ID and harder particles being acceptable to 5% of tubing ID.