30 Gas Detection
New Lead-Free 4OXeco LP Oxygen Sensor Offers Five-Year Life in Flue Gas Analysers
Developed to improve the accuracy, operational life and resistance to cross-contamination in flue gas analysers, the new 4OXeco LP sensor from City Technology (UK) uses the company’s well established lead-free toxic gas sensor technology to reduce response and recovery times and eliminate field failures. The 4OXeco LP low power version for use in portable equipment is produced in City’s industry-standard 4 Series form factor to ensure mechanical compatibility with existing instrument designs.
Portable and fixed flue gas analysers are widely used in power stations, industrial, commercial and residential buildings to measure the oxygen and carbon monoxide content of boiler flue gases, a key measure of efficiency and safety. The use of natural gas, LPG, light and heavy oils, biomass, wood pellets, coal, propane and butane in fixed boilers and power generation plants has increased the amount and types of contaminants likely to be present in flue gases, creating the potential for a higher incidence of false readings during measurements.
Tom Gurd, City’s Emissions Product Manager, said, “Increasing energy costs are making it more beneficial for businesses and homeowners to maintain combustion processes at peak efficiency. 4OXeco LP marks another major innovation in gas sensing technology from City. The new sensor is specifically designed to cope with the harsh environment in which it has to operate, it has proved its performance during our accelerated life test programme and two years of field use with a development partner in Germany, one of the most strictly regulated markets in Europe.”
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WD1200 & WD2200 Series Fixed Gas Monitor
IRmax Infra-Red Hydrocarbon Gas Detector Certified to SIL 2
Crowcon’s (UK) IRmax infra-red hydrocarbon gas detector has been certified to SIL 2 by Sira Test and Certification Ltd according to the requirements of the IEC 61508 and EN50402 functional safety standards. This certification provides 3rd party assurance of the integrity and dependability of the IRmax and allows it to be included as part of a SIL 2 safety system.
According to Sira, the IEC 61508 functional safety standard “provides the assurance that the safety-related systems will offer the necessary risk reduction required to achieve safety for the equipment”.
The EN50402 (Electrical apparatus for the detection and measurement of combustible or toxic gases or vapours or of oxygen. Requirements on the functional safety of fixed gas detection systems) takes the general requirements of IEC 61508 and extends them by applying them specifically to gas detection equipment.
Main features: • Newly designed appearance • Excellent SMT processing technique
• Intelligent replaceable sensor module design
• Easy to connect the cables • Easy to install on the spot • Module design • Innovative module design
Contact us:
sales@hwsensor.com or call 86-371-67169080
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Measuring Gases with a Uniform Operating Principle
All the microprocessor-based transmitters in the Polytron 8000 series have the same design and user interface, which guarantees a uniform operating philosophy. The advantage: simplified handling, less training requirement and easier maintenance.
Dräger (Germany) has been developing and manufacturing sensors and gas detectors for industrial use for more than 40 years. This experience has been incorporated into the new Polytron 8000 series. All devices feature durable sensors, short response times, high sensitivity and high accuracy.
Five versions are available: the Polytron 8000 (ELCH), Polytron 8200 (CatEx), Polytron 8310 (DSIR) and Polytron 8700 (PIR 7000) for the detection of combustible gases and vapours and the Polytron 8720 (PIR 7200) for the measurement of carbon dioxide.
The Dräger Polysoft software and a HART interface (Highway Addressable Remote Transducer) allow remote access to the transmitters for easy and quick assessment of the device status. Integration into existing management systems is also possible. Fieldbus systems such as Foundation Fieldbus or Profibus are supported by appropriate interfaces.
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www.envirotech-online.com 87 88
Specifications: • Sensor type: Catalytic sensor, fuel cell sensor, electrochemical sensor
• Accuracy: ±3% F.S. • Ingress protection: IP65 • Explosion-proof grade: Ex d IIC T6 • Signal output: • 4-20mA (3 lines) • RS485 (4 lines) • Screws size: G1/2” and G3/4”
During the six month certification process, Sira scrutinised every detail of the IRmax’s design - from hardware and electronics to software - against the required standards to achieve SIL 2 certification. The product was performance tested according to EN60079- 29-1 and documentation for the product (specifications, software structure) – as well as Crowcon’s quality management systems – were also assessed to ensure compliance with the strict requirements of the standards.
“Product documentation including a SIL certificate and ‘safety manual’ provide the data and information to ensure that the product can be easily integrated into a SIL 2 system and installed operated according to the requirements of the certification,” comments Andy Avenell, Crowcon’s Senior Product Manager.
“Crowcon’s management systems ensure that IRmax continues to comply with the standards regardless of modifications during the product’s life-cycle,” he added.
Crowcon’s commitment to functional safety extends beyond product design: key members of Crowcon’s R&D team are certified ‘Functional Safety Engineers’. A Crowcon engineer is also a member of the European committee currently updating the EN50402 standard.
Sira Test and Certification Ltd (a CSA Group company) is UKAS accredited and uses the CASS methodology to provide third party certification to IEC 61508 and other standards on safety related issues. This includes the products’ performance tests, functional safety management systems, hardware and software.
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