44 Gas Detection Flexible Gas Monitoring
The X-zone 5000 from Dräger (Germany) combines the advantages of mobile and stationary gas measurement, making it ideal for situations with increased security needs - for example for maintenance of industrial plants. The monitoring device is placed at locations where a gas leak is likely to occur. It can constantly monitor these areas and provide a pre-warning before sending people to a danger zone. The X-zone 5000 itself cannot measure the gases. For gas measurement, the portable gas detector in the size of a mobile phone, the X-5000, is plugged into the field monitor and communicates with it automatically. This way, the X- 5000 detects up to six explosive, flammable or toxic gases and warns if one of them is present in the ambient air. This particular type of device combination is patented by Dräger.
The X-zone 5000 works without an external power supply and without interruption for up to 120 hours. It can take in gases from all sides and warns both optically and acoustically within a radius of 360 degrees. Even in noisy and confusing areas, the alarms of 108 decibels can be perceived clearly. In comparison: a starting airplane reaches a volume of about 120 decibels.
The Dräger X-zone 5000 monitors a perimeter of approximately 25 meters. The user can expand this radius greatly by interlinking multiple devices, via a wireless connection or cable. Up to 25 field monitors automatically connect to form an ’alarm chain’ and exchange information over a distance of up to 100 meters. In case of danger, the detecting device sends its signal to the connection network, causing all devices to sound the alarm. The source of danger is easily identified: the triggering device glows red, the other devices are red and green.
To monitor the air in tight and small spaces such as industrial tanks, the X-zone 5000 has a pump that supplies the air from the respective container, with the
monitoring device inside the container sending alarm signal to a device stationed outside. Besides its own warning, the X-zone5000 can also trigger alarms in other danger areas allowing the device can initiate security measures, such as switching on a ventilation system.
The X-zone 5000 includes a Zone 0 hazardous approval and can therefore be used in the explosive environments. It works in temperature ranges between -20 degrees C and +50 degrees C, and operates in accordance with IP 67 certification resistance to dust and water.
The X-zone 5000 is capable of working on battery power without interruption for up to 120 hours. If you do not change the workspace of the device, no calibration or adjustments are required. The device is then tested once before first-time use with the help of the bump test station or the workshop Solution E-Cal.
Reader Reply Card No. 114
New Developments for Photo Ionisation Detector
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. 116
Miniature Pumps Provide Utmost Safety in Gas Analysis Devices
Miniature pumps with extremely long service lives by Schwarzer Precision (Germany) are some of the main components in portable gas analysis devices. Indispensible for reliable functioning, these devices cannot be small enough not to hamper their carriers – and to even save lives, when it counts.
The pump steadily sucks in the ambient air and transports it to the sensor for analysis. Apart from absolute leaktightness to prevent falsified analyses, minimum power consumption if also very important. This is the only way for the accumulators, and thus the devices, to become increasingly smaller.
The worldwide smallest eccentric membrane pump from Schwarzer Precision meets all these requirements. With dimensions of merely 13 x 22 x 32mm and a weight of only 15g, the SP 100 EC guarantees perfect measuring results. Optimally coordinated pump components and the innovative High Response Valve System permit this maximum reduction. And thanks to the modular design, the miniature pumps from Schwarzer Precision are adapted exactly to customer preferences. The objective at Schwarzer Precision is: Smaller and smaller, better and better! Revolutionary developments are part of the Schwarzer standard program.
Reader Reply Card No. 115
Fixed Gas Detector Receives ATEX Approval
Oldham (France), an Industrial Scientific Company, is pleased to announce that the OLCT 10N fixed gas detector has been certified by INERIS and now carries the ATEX mark of approval. All versions have been certified IP65 and for use in zones 2 or 22, Group IIC or IIIC hazardous locations.
Designed for the detection of explosive gases (CH4, H2, C3H8 and C4H10), toxic gases (CO, NO, NO2, H2S and NH3) or oxygen, the OLCT 10N is a digital detector intended for use in combination with Oldham’s MX43 controller
that can reap the full benefits of digital technology. The MX43 offers up to 32 detectors per line, toxic and explosive gases can be combined on the same line, semi-automatic calibration enabled and reduced wiring costs
Satisfying your safety requirements means making genuine technological breakthroughs as well as providing clear economic value. Thanks to a magnetized calibration cup the calibration can be done without opening the enclosure. This allows maintenance by a single person and significant reduction in costs.
Additionally, once the calibration is done, the OLCT 10N transmits the relevant data to the MX43 (such as date of calibration, span reserve or T90) and really makes your maintenance safe and efficient!
With a 2-year warranty, the OLCT 10N transmitter will provide reliability and extended life. Reader Reply Card No. 117 Reader Reply Card No. 118
IET November / December 2011
www.envirotech-online.com
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