Sensor Focus Photo Ionisation Detector – Plus (PID-Plus)
Alphasense (UK), an independent gas sensor technology company, has been working with Owlstone to apply their Advection Diffusion Spectrometry (ADS) technology for chemical detection, on a new development based on the Alphasense PID modules giving enhanced selectivity through the use of the Ion Mobility Spectroscopy (IMS) - ADS technology.
Utilising existing PID technology and linked to a sensor module that has been produced featuring a chip, fan for gas sampling, the micro- controller with associated electronics uses UV as the preferred ionisation source. The sensor module/chip, has embedded firmware, is mounted to a rigid circuit board as part of the newly developed Owlstone IMS-ADS module.
Gas flow through the chip must be regulated and at least two signals will be output (peak height and peak width), a third signal (kurtosis) is possible but will require additional work to the sub-module. Signal outputs could be analogue, PWM or serial. End-users will have no need to see raw spectra, as all processing will be performed on-board.
Arthur W Burnley, Sales and Marketing Director for Alphasense, stated, “Successful development of this new sensor technology will open a range of exciting commercial opportunities for Alphasense. We are very happy to be working with Owlstone in what will prove to be a mutually rewarding partnership, and we are anticipating that this device will be available for sale in Q3 of 2011. Alphasense is a centre of excellence for gas sensor technology and the PID-Plus is just one of several new and exciting product introductions planned for 2011. Further developments from Alphasense include expansion of our existing NDIR, Catalytic and Electro-Chemical sensors (measuring as low as 10ppb) plus the addition of Mixed Metal Oxide sensors and more.”
Reader Reply Card No. 210 Oxygen Sensors With Long Working Lives
The new electrochemical oxygen sensors from MST Intertrade GmbH (Germany) use a new type of electrolyte material, whose electrochemical reaction does not result in the passivation of the electrode.
The working life quoted by the manufacturer is therefore at least 10 years (20.8% O2 at 20 °C). The sensitivity is reduced within three years by less than 15%, and after 10 years by a maximum of 30%. The
sensors are available in two versions, with measuring ranges from 0 % to 30% O2 or 0% to 100% O2. They can be sued in a very wide working temperature range from -35 °C to +50 °C. The sensors show no cross-sensitivity with most gases. At a temperature of 20 °C for example, 10% CO, 30% CO2 and 30%
H2 do not interfere with the measurement. The company also offers microsensors, which are used particularly in the area of work safety for portable gas measuring devices. These sensors are used for example in the mining industry, in order to warn miners of too
low oxygen concentrations or dangerous methane concentrations. With a working life of at least three years, these sensors are also extremely durable.
Reader Reply Card No.
VOC Sensor Kits Including Remote Sensors for Air Duct Measurements
AppliedSensor’s (Germany) latest member of the successful iAQ product family of VOC sensor modules for indoor air quality assurance offers the key building blocks for easy design of air duct VOC sensors. The kit comprises of a controller-board, a ready-made cable, and a remote sensor component. The sensor component is designed for probe-tip integration while the controller- board can be located in a housing outside the air duct, both connected via the customised cable.
Reader Reply Card No.
Process Immersion Fitting for
Electrochemical Sensors
212 Reader Reply Card No. 213 211
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The new JUMO (Germany) 202821 series process immersion fittings are used to securely install electrochemical sensors in containers. They are specifically designed for use in harsh ambient conditions and are the preferred choice for us in heavily polluted media or in media where a coating could build up. A rinsing function is available as an option, so that the sensors can also be gently cleaned under process conditions.
Reader Reply Card No. 214 Reader Reply Card No. 215
www.envirotech-online.com IET March / April 2012
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