压控式分配系统机械结构简单，仅需少量组件。压力控制器搭配安全阀，用于对装有液体的容器施加压力。该压力通过软管和电磁阀输送液体。最后，喷嘴通过带设定开口的针尖将液体注入容器中。凭借易于集成的压力-真空发生器，该系统可在绝大多数地方运行。即使是没有中央压缩空气供应系统的实验室，也能正常工作。该系统只有少量活动部件，易于清洁、维护和参数设置。压力的设置取决于介质，而阀的开启时间则是根据所需的体积来确定。他们的基本构造都是相同的，但根据液体的情况，可以使用不同的阀。配量过程通过介质分离式液体阀来进行，对于腐蚀性介质，液体阀必须具有耐化学性的特点。使用气体阀移液。吸入通过真空来完成的。一次性移液吸头可防止在使用不同液体时造成污染。图形用户界面 (GUI) 用于操作。
对于实验室自动化系统中的大量过程而言，运送微量液体这一步至关重要。通过压控式分配系统，可以精确、可靠地滴定低至 1 μl 的体积，差值系数 < 1% CV（取决于液体量和环境条件）。压力能以独特的方式控制液体的速度，而且不受分配、吸入和移液功能影响。用户可以对系统进行微调，以获得最佳流量和精确度。这样就能实现干净地断滴，从而达到可重复的精度。对于敏感液体，如悬浮液，可使用较低的压力来平稳运送溶液。此外系统还提供许多监测功能用于过程控制。
Since many laboratory processes require liquids to be handled precisely, automation leads to significant productivity gains and improved process reproducibility. One of the biggest benefits of pressure-controlled dosing systems is their scalability. For example, individual dispense heads can be combined by mounting them on a rail with a freely selectable grid. All dispense heads can be controlled independently to dispense different liquids simultaneously or to set different volumes.
To increase productivity, the dispense head can be easily integrated into a planar surface gantry. This subsystem enables kinematic movements and liquid handling in a compact workspace, for example for preparing samples or adding liquids to microwell plates. Pressure-controlled dosing systems enable a high throughput. The high flow rates and constant flow pressure optimise performance compared to other systems.
Festo offers a comprehensive portfolio of products for pressure-controlled dosing systems that can be easily scaled and combined. Talk to the LifeTech experts at Festo about the solutions that best meet your individual requirements in terms of precision, flexibility, or throughput.