Laboratory Products 37 Precise back pressure control for challenging gas–liquid systems


Vapourtec has unveiled the eBPR-GL, a self-contained, electronically adjustable back pressure regulator engineered for gas and gas–liquid applications. Using advanced composite materials, the eBPR-GL provides precise control over back pressures from 0.1 to 10 bar (gauge) and fl ow rates from 0.01 to 20 ml/min, handling fl uids at temperatures up to 100°C.


Conventional BPRs often struggle with gases: leakage rates are higher than with liquids, causing pressure fl uctuations - especially at low fl ow rates - and signifi cant internal volumes can disrupt gas–liquid partitions. The eBPR-GL overcomes these challenges, offering stable, accurate pressure control even when gas partitioning is critical.


“eBPR-GL is a major step forward for back pressure regulation in gas–liquid systems,” said Duncan Guthrie, Vapourtec Managing Director. “Its wetted fl ow path features only PTFE and PFA fl uoropolymers, with perfl uoroelastomer seals, ensuring chemical resistance and reliability.”


The eBPR-GL can be supplied with or without an integrated user interface. Both versions support remote pressure adjustment via RS-232 serial commands. More information online: ilmt.co/PL/Rn1N


65811pr@reply-direct.com


Pre-aligned collimators and expanders for large optic systems


Optical Surfaces Ltd has introduced a novel approach to large-diameter optical systems with its pre-aligned beam collimator and beam expander modules. Traditional solutions for long focal length or large-diameter optics often involve bulky, heavy, and costly refl ective systems. Optical Surfaces’ modular, lightweight kits overcome these limitations while maintaining precision and stability.


The company’s pre-aligned beam collimator kits feature a new kinematic mounting system, enabling faster, more accurate, and highly reproducible assembly of large optical systems. High performance is achieved through a novel mounting technique, delivering a zero expansion parabolic mirror better than lambda /10.


Beam expanders follow a similar concept. While enclosed pre-aligned optical systems work for diameters up to 200 mm, larger systems become impractical due to size and weight. Optical Surfaces’ pre-aligned beam expander modules, suitable for optics up to 500 mm, include fully mounted primary and secondary mirrors that come pre-set and aligned. This eliminates the need for complex fi ve-degree-of-freedom setups, reducing installation from days or weeks to just a few hours.


By combining pre-alignment with kinematic mounting, Optical Surfaces provides researchers and engineers with a practical, cost-effective solution for building large optical systems quickly without compromising precision.


More information online: ilmt.co/PL/BZRR 65852pr@reply-direct.com Precision fl ow measurement key to hydraulic performance


Titan Enterprises is sharing insights to help engineers and operators address the challenges of precision fl ow metering in hydraulic systems, ensuring safe and reliable process operations.


On the surface, metering liquids under pressure can appear straightforward: install a fl owmeter, connect it to an instrument, and control the system via software, pumps, and valves. In practice, however, achieving precise and repeatable results is far more complex. Even minor variations in system design or process conditions can cause inaccuracies, waste product, and disrupt operations.


Flowmeters are central to the performance of hydraulic systems, from test rigs and pump calibration to setting fl ow control valves. These systems depend on the precise movement of fl uid to transmit power, and any deviation from the required fl ow rate risks reduced effi ciency, excessive wear, or outright failure. Temperature fl uctuations, for example, can alter viscosity and fl ow behaviour, signifi cantly affecting accuracy. By designing systems that minimise variables at the outset, and by selecting the right meters, pumps, and valves, engineers can better compensate for these challenges.


Accurate fl ow measurement provides more than just data on fl uid movement. It enables operators to detect leaks or blockages, maintain stable pressure, and ensure actuators and other components receive the correct volume of fl uid for optimal mechanical output. This makes reliable metering a critical part of maintaining both system health and operational effi ciency.


A number of factors must be considered when specifying and installing hydraulic fl owmeters. System repeatability depends on eliminating air pockets that cause volumetric errors. Stable operating conditions of pressure, temperature, and fl ow are essential for accurate calibration. Pump type can determine whether pulsations disrupt fl ow, making the integration of dampers or regulators important in many designs. Flowmeter placement also matters, with positioning close to dispense valves helping to reduce inertia effects. Beyond installation, engineers must match meter technology to the properties of the working fl uid. While turbine meters can lose accuracy as viscosity increases, positive displacement devices often perform better with thicker fl uids. Similarly, careful valve selection and the use of advanced electronic fl owmeters can further enhance precision and repeatability.


As industries such as aerospace move toward higher hydraulic pressures to increase effi ciency and reduce system size, the demands on fl owmeters grow. Devices must not only provide accurate, real-time data but also withstand extreme pressures with appropriate safety margins.


Titan Enterprises offers a broad portfolio of fl ow measurement solutions for hydraulic applications operating from 10 to 950 bar, with customised and OEM versions available to meet specifi c needs.


More information online: ilmt.co/PL/23B2 and ilmt.co/PL/lMn7 65787pr@reply-direct.com


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