Advertorial
Gas detection and measurement with pyroelectric detectors
New thin film pyroelectric sensors, fast switching IR sources and suitable gas cell design enable new levels of ppm detection levels. Tighter legislation on environmental pollutants and a public desire for green products, non-dispersive infrared (NDIR) technology is one way to monitor a range of gases, single or multiple wavelength detection in real time. Using a 1µm thick sputtered PZT perovskite structure (111), a permanent polarisation pyroelectric detector can be produced with the benefits of semiconductor manufacture due to its MEMS design flexibility with selective wet and dry etches. These devices have a Curie point above 500˚C and are extremely stable. They exhibit low noise (no noise spikes, no popcorn noise, low Johnson noise), and with an integrated OpAmp high output signals are achieved. Based on 14 Patents with a further 10 Patent applications, this Siemens technol- ogy offers an unprecedented new range of
detectors, which span the 0.1µm to THz region. Detectors in the NIR region are proving to be formidable devices compared to lithium tan- talate pyroelectric detectors for NDIR gas sensing applications. Using either an IR emitter, typically pulsed between 1-10Hz, or light from the object of measurement, such as a flame, and narrow bandpass optical filters, gas detection levels from sub-ppm to 100% can be achieved. With two, four or more channels, multiple gases may be simultaneously measured in real time, including volatile organic com- pounds (VOCs), which can affect the environment and human health. Laser Components (UK)
T: 01245 491499 E:
kcable@lasercomponents.co.uk Enter 714
www.lasercomponents.co.uk Meeting demands for quality gas sensors
Alphasense is a totally independent Sensor Manufacturing and Technology Company, founded in response to an overwhelming demand from gas detection OEMs and end users for better quality gas sensors.
Supporting our customers is one of our highest priorities. The Alphasense team has many years of design, manufacturing and application experience. We are not only improving our products continuously, but also our inter- nal procedures to ensure we offer the highest possible levels of customer support.
The Alphasense team has a high level of expertise and many years of collective experience in a variety of gas detection technolo- gies including Electrochemical, Catalytic, NDIR, PID and Semiconductor, to ensure that we offer the best technology solutions to each customer’s requirement. This provides ideal opportunities for joint venture projects or factor- ing other technologies.
As a completely independent sensor supplier, we work in the
Low-cost OEM gas sensors feature improved communications Edinburgh Instruments
has a well-deserved reputation in the arena of infra-red gas sensing technology, with a track record spanning over 20 years. The company is continuing to build on this reputation with the introduction of its next- generation OEM sensor, named the Gascard NG.
Utilising established and proven technology from the existing Gascard range of instruments, the Gascard NG not only addresses existing customer requirements, being backward-compatible with the current Gascard model, but it also provides for future extendibility and functionality through improved communications and configuration options.
The main highlights of the Gascard NG are:
• Backward-compatibility with the current generation of Gascard detectors • Temperature and pressure correction via on-board sensors • On-board RS232 communication • TCP/IP communications protocol option • Field-replaceable IR source • Windows-compatible data logging software
Available for the measurement of CO2, CH4, CO and selected refrigerants.
Contact Edinburgh Instruments by email for more details.
Edinburgh Instruments
sales@edinst.com
S8 Enter 716
strictest confidence with our cus- tomers to give you the sensor solu- tions you want. Alphasense has invested heavily in state-of-the-art automation and process equip- ment to ensure that sensors are produced and validated in volume to tight specifications. We use Kanban and Cellular Manufacturing Techniques to ensure we deliver the right quality of product, when you want it. Our manufacturing and design opera- tions comply with ISO 9001:2000. Alphasense manufactures a range of Electrochemical Oxygen and Toxic Gas Sensors to our own design and plug-in replace- ments for other brands. Our sensors carry a no-leak guaran- tee, along with computerised bar-code tracking. Further prod- uct releases, some utilising alter- native technologies, are always under development.
Alphasense T:01376 556700
Enter 715
E:
sensors@alphasense.com www.alphasense.com
Net Safety Monitoring Millennium II
NE-MOS toxic gas sensor Net Safety's Millennium II Solid State Nano Enhanced Metal Oxide Semiconductor (NE-MOS) Toxic gas sensor utilises recent advances in nano engineered materials to dramatically increase the sensor's perfor- mance, selectivity, and stability. Ideal for dry/hot applications with industry leading response times, our nano-enhanced sensor eliminates the sensor ‘falling asleep’, as seen with legacy MOS sensor designs. The Millennium II Multi-Channel and Millennium II BASIC trans- mitters automatically recognise the pre-calibrated sensor and maintain an uninterrupted digital signal between them, providing leading response times including the fastest response time in the market today
for Hydrogen Sulfide H2S gas detection (
www.net-safety.com/ products/
gas-detectors.html) .
The robust housing design offers easy access to the intuitive menu options and non-intrusive calibration commands in Class1 Div1 areas via the external magnet and innovative OLED graphic display. This OLED display provides read-outs that are clearly visible in darkness or bright sun, blistering heat or at temperatures as low as -55°C. Add our optional intrinsically safe HART port adapter for access to the built-in data logging and advanced diagnostics, right at the transmitter via a hand-held communicator.
All this amounts to a detector which stands alone in it's simple installation, calibration, and rock solid day-to-day operation. Finally, a line of gas detectors engineered from the ground-up to withstand extreme conditions that also include all the features managers and operators in the field demand. The Millennium II Series pushes the boundaries of what you can expect from your detectors.
Net Safety T: (403) 219-0688 Enter 717
www.netsafety.com Gas detection & measurement – February 2011
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