Gas Sampling, Detection and Analysis
Tightening legislation and the growing global focus on air quality, worker safety and environmental emissions are driving the requirements for a new generation of measurement and monitoring systems. With its combination of performance, pulsation-free flow, controllability and size, the multi award-winning piezoelectric micropump, Disc Pump™, from LEE Ventus is well placed to enable the development of these systems, from gas samplers and detectors, to laboratory analysers and particle counters.
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Benefits |
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Enhanced Sensitivity Disc Pump moves a few hundred nanolitres per cycle, resulting in negligible pulsation and improved signal to noise ratio. Flow Control Precision Set points can be held within a fraction of a percent — limited only by the resolution of control hardware / sensors. Dynamic Range Unlike conventional pumps, Disc Pump has no stall speed, offering a near-infinite turn-down ratio. |
Response Speed Disc Pump has relatively little inertia. This means that it can respond to full-scale set point changes — including on/off gating — in a matter of milliseconds. Portability Disc Pump weighs just 5 g (1/5 oz) and occupies a volume of 7 cm3. Also by eliminating the need for damping hardware, Disc Pump enables further reductions in size and complexity. |
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Pulsation-Free OutputThe figure to the left shows the pressure pulsation generated by a Disc Pump, a diaphragm pump, and a rotary vane pump1. The diaphragm pump creates large, low-frequency pressure oscillations. The rotary vane pump produces smaller, higher-frequency oscillations; however, the pulsation is still readily apparent—despite this, rotary vane pumps are often sold as “low pulsation” solutions. Disc Pump, on the other hand, produces very little pulsation at all; no pulsation is observed above the background noise floor of the measurement sensor. ______________________ 1 Pumps driven to deliver approx. 80 mbar against a 30k Lohm flow restriction. Pressure output measured with a high-frequency pressure sensor sampling at approx. 60 kHz |
Disc Pump’s smooth flow is important to prevent noise on our sensors – the less noise the greater sensitivity we can achieve. It will also help us to easily maintain constant flow via a feedback loop – as our system will change over time this is an important benefit.
Peter Morris, Business Unit Manager - Sensors, Ion Science
Applications
With its unique set of features of Disc Pump™ enables advances across a broad spectrum of applications, including but not limited to:
- Particle counting
- VOC detection
- Air quality monitoring
- Docking / calibration stations
- Calibration gas generation
- Leak detection
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- Workplace monitoring
- Fence-line monitoring
- MRI-compatible measurements
- Portable & wearable monitors
- Water sampling
- Ion Mobility Spectroscopy
Case Studies
Download our Gas Detection case study pdf1.04 MB
This case study looks at the general benefits of Disc Pump for gas detection, monitoring, sampling and analysis applications.
Rapid, real-time gas sampling for a 'breathalyser for disease'
Read about how Disc Pump's millisecond response capability has enabled Owlstone Medical to create a revolutionary breath sampler for the early detection of cancers.
LEE Ventus’ novel pump has enabled the evolution of our capture and analysis platforms – creating a highly responsive, extremely sensitive detection system.
Alastair Taylor, Chief Product Manager, Owlstone Medical Limited