Safety 7


voltage adjustments at the point of detection. Additionally, the flexibility to calibrate an electrochemical sensor to a particular gas level and then make simple adjustments to the range later—without recalibrating the sensor to the new range—can offer significant efficiencies in sensor maintenance.


Through advanced engineering, a sensor’s microprocessor can remember the type of sensor installed, as well as all calibration values. This built-in system of checks and balances virtually eliminates duplication of effort and the possibility of installing the wrong sensor.


Global Standards


Legacy System: Global certification, especially when deploying a variety of detectors, can complicate and delay the ability to engage in business as your company expands its operations.


Truly Universal System: Expanding the certification of a gas detector for global acceptance (including CSA, ATEX, IECEx, INMETRO, GOST-R, China Ex, A & C Tick, Marine Directive - Ship’s Wheel/ ABS and SIL 2 certified by TUV-Rheinland), plays a critical role in facilitating quick global adoption. The process of seeking global certifications can be further streamlined when a single gas detector is flexible enough to accommodate a wide range of toxic and combustible gases.


Cost of Ownership


Legacy System: The presence of more points (i.e., detectors) means higher maintenance, more complexity and incremental costs associated with added cabling, junction boxes and wiring.


Truly Universal System: Less is more – and better – when you can reduce the number of points in a gas detection system. One device consolidating three points has a positive ripple effect in terms of installation and maintenance. For instance, at a site with 45 points, accepted practice would include point-to-point wiring, using a Modbus communication protocol wired back to a central location or controller. But with a multi-head scenario, handling three points each, the number of detectors is reduced to 15 devices. This approach represents significant cost savings. In fact, using a single detector that consolidates three points, with a single relay board to control three alarms, totally eliminates a costly controller. Multiply this configuration times three for every three-head detector/multiple sensor configuration, and your cost of ownership is further reduced.


Conclusion


Exploring a series of “universal truths” about next-generation fixed gas detection is a critical first step in evaluating how you protect your people and maintain the highest levels of productivity. Truly universal gas detection begins with a singularly flexible system, engineered to ensure accurate performance in a wide range of environments; considers current and future manufacturing plant environments; and plays a significant role in keeping costs under control in the face of global certification requirements and a changing workforce. How you use this insight will impact where, how and how successfully you conduct business.


For more information about best practices in gas detection or to learn more about Scott Safety’s Meridian Universal Gas Detector and Meridian Sensors, please call 800-247-7257 or email us at scottsafetymeridian@tycoint.com. We also invite you to visit UniversalByScott.com.


Workforce Knowledge Base


Legacy System: Multiple manuals or the knowledge of many different product lines can slow the installation process and impede productivity.


Truly Universal System: In today’s climate of doing more with a smaller, less specialised workforce, it is becoming increasingly important to reduce the number and types of detectors. Truly universal engineering facilitates green field installations and means zero risk of installing the wrong sensor- specific type transmitter. And when it’s time to change sensors, due to changes in manufacturing operations or maintenance, a gas detector that accepts hot swappable sensors provides a fast, efficient roadmap to business continuity.


Toolbox


Legacy System: Large inventories of sensors, detector heads and accessories demand a significant inventory investment.


Truly Universal System: A field technician looks in his toolbox and sees fewer sensors, detectors and calibration adapters, as well as fewer accessories (like deluge guards and flow cells). Universal mounting kits simplify the process in new installations, while retrofits to existing installations are significantly more manageable. This simplification also minimises lapses in safety due to human error.


Don’t Pay the Price for Skimping on Safety


Despite several recent high-profile industrial accidents, industrial safety breaches remain all too common.Trevor Dunger and Stuart Nunns of ABB (UK) explain how choosing the right safety instrumentation can deliver long-term security and lower life-time cost.


There are several good reasons why it pays not to skimp when selecting specialised instrumentation and control equipment for safety applications.


Because safety systems typically kick in only when there is a problem, it’s possible for a transmitter or other safety loop component to malfunction undetected. Safeguarding against this demands good quality, extensively tested equipment, with redundancy levels and self-diagnostic capabilities that far outstrip those required for non-critical systems. Secondly, safety is a niche application which doesn't benefit from the same economies of scale as the mass-market in standard controls. Companies should look for instruments and systems offering optimum lifetime security and cost-effectiveness.


First, consider the parameters defining overall safety loop effectiveness. The most well-known of these is the required Safety Integrity Level (SIL), as defined by IEC 61508. Generally speaking, it’s best to design process risks out before installing specialised systems to control them. This will often reduce the required SIL and the cost of any associated safety systems.


Next is the average probability of failure on demand (PFD), which varies depending on the required SIL as well as the frequency with which a safety instrumented system will be used.


Other relevant factors affecting whether an individual instrument is suitable for a particular SIL are the safe failure fraction (SFF) and the hardware fault tolerance (HFT).


Another key factor is the systematic capability, encompassing the design and engineering of the element itself and the integration of elements to form the safety system.


A final factor is the quality of documentation available from the equipment supplier and their ability to show their equipment is “proven in use”.


Opting for higher integrity equipment really can save money in the long term.


Firstly, safety systems do not need testing as often to check they are still working properly, especially if they can demonstrate a higher HFT and a lower frequency of dangerous undetected failures.


The second area for savings is insurance. Some insurers now insist on compliance with particular safety integrity levels before they will agree to provide cover.


The biggest savings come from preventing accidents occurring. Add to this the protection of personnel and the surrounding community and the case for excellence in safety systems is compelling, whatever the state of the economy. 24830pr@reply-direct.com


For More Info, email: SERIES SY2 - AX


SY2 is a standalone device, detection for flammable gas, toxic gases, CO2 and oxygen. Certified to: II 2 G Ex d IIC T6 (Ta - 50°C. + 80°C) II 2 D Ex tb IIIC T85°C. (Ta - 50°C + 80°C)


Makes it particularly suited to the demanding conditions encountered in the chemical and petrochemical industry on & off shore. SY2 can be supplied in different electronic configurations: B (Base): Only 4 - 20 mA signal output and calibration via IrDA interface and external Hand Held Programming unit. B/D (Base + Display)


B/D/R (Base + Display + Relay) B/D/R/SL (Base + Display + Relay + Serial Link)


Optional SIL 2 certified conbinations


Are you interested in what you have read but want to know more?


Via Cesare Battisti 50-D 24046 - Osio Sotto (BG) ITALY Tel. (+39) 035-482.39.39 Fax. (+39) 035-482.37.79 email. info@geitsrl.com


email. angelo.vignera@geitsrl.com email: 96ad@reply-direct.com AUGUST / SEPTEMBER 2013 • WWW.PETRO-ONLINE.COM


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