Gas Detection - UK Focus xi
Gas Alarm System Protects Waste Treatment Staff The human nose is particularly sensitive to Hydrogen Sulphide (H2
S); a highly offensive odorous gas, reminiscent of rotten eggs. With an odour threshold between 0.005 ppm and
1.5ppm, relatively low levels of Hydrogen Sulphide can result in complaints if industrial plants generate exposure at these levels. A chemical waste treatment plant in the UK has therefore installed a monitoring and alarm system to generate alerts when H2
S concentrations reach levels that might cause concern with staff and the Public.
Hydrogen Sulphide is often produced by the breakdown of organic matter in the absence of oxygen, and for this reason it is a major concern for the operators of waste treatment facilities. Hydrogen Sulphide gas is well known as an unpleasant odour; forming, as it does, the main component of the stink bombs that children are able to buy. Stink bombs generally contain Ammonium Sulphide, which, when exposed to air, reacts with moisture to form Hydrogen Sulphide and Ammonia, another unpleasantly odorous gas. One might therefore assume that any problems associated with Hydrogen Sulphide are solely associated with odour nuisance. However, Hydrogen Sulphide is a highly toxic and fl ammable gas, causing irritation to the eyes, throat and lungs, and can cause death in high concentrations
The maximum occupational exposure level (8 hour time-weighted average) in the UK is 5ppm, with a short term exposure limit of 10ppm. Exposure to levels over 20ppm can cause dizziness, and exposure to over 100ppm can cause death after 48 hours. Levels over 700 ppm cause almost instantaneous death.
The challenge for the monitoring instrumentation sector is to be able to monitor Hydrogen Sulphide at suffi ciently low levels continuously without interferences from other gases. So, when Air Monitors was approached by a chemical waste treatment plant looking to install a Hydrogen Sulphide alarm system, the Honeywell SPM Flex was the obvious choice. “The plant regularly treats sewage, so Hydrogen Sulphide is a signifi cant concern, both for plant staff and for the local community,” explains Colin Craggs from Air Monitors. “The SPM Flex operates a novel cartridge system that enables users to select the specifi c gas or gases of interest – H2
S in this case, and we connected the instrument to an Envirologger, so that data could be viewed on the web, and so that alarms can be issued in a variety of ways – email, text etc.”
With a detection limit of 1 part per billion (ppb) the SPM Flex is extremely sensitive; each cartridge contains a tape which has been impregnated with chemicals that perform analysis of the target gas. The chemical reaction that takes place produces a colorimetric response that, whilst not visible to the eye, is measured by the instrument’s internal optics. For continuous operation, each cartridge lasts for around one month before a change is necessary (the instrument alerts the operator beforehand). However, ‘extended’ cartridges are available which lengthen the operational period to 2 months.
The SPM Flex can also be employed as a portable instrument, running for up to 10 hours on an internal rechargeable battery. Colin says: “In combination with the selection of cartridges available, this provides an opportunity to respond to an emergency with an instrument that is able to test for the gases of specifi c concern.” In applications where continuous monitoring is required, the SPM Flex can be connected to mains power and the battery effectively becomes a back-up in the event if power failure.
Describing the performance of the SPM Flex at the wastewater treatment plant, Colin says: “The system was installed over 6 months ago, with alarm levels set at 50 ppb, and since that time, alarms have only been issued a handful of times, so the client can rest assured that any unusual H S levels will be detected quickly, and his staff and neighbours are now protected.
“The key to the success of this system is the sensitivity of the monitor; by setting the alarm level at such a low concentration the wastewater treatment plant is able to raise an alarm before staff and neighbours notice the odour, and in doing so, they ensure that potentially harmful exposure is effectively prevented.”
Life Safety with Oxygen Monitor Upgraded
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As the Paracube Micro sensor utilises Servomex’s patent Magnetodynamic Paramagnetic technology, the sensor never depletes and the measurement remains accurate. This avoids false readings and false alarms caused by depleted cells, as well as the serious safety risk caused by life safety systems being turned off or ignored because of constant false alarms.
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Alongside these safety and performance benefi ts, the OxyDetect offers users a considerably lower cost of lifetime ownership. The ongoing costs associated with the regular replacement of electrochemical cells, as well as the recognised problems of cell degradation when in use or kept as a stock item, are eliminated. As the OxyDetect’s Paramagnetic measurement stability also eliminates the requirement for frequent calibration, users avoid the labour and downtime costs incurred through regular calibration requirements or replacement due to anticipated cell expiration or sudden failure.
, Servomex OxyDetect can be used for indoor environments ranging from 5°C-45°C. Integration is simple using an isolated 4 – 20mA output with linear measurement, and mains-rated relay outputs for instrument fault, low alarm one and low alarm two. An optional Ethernet output is also available.
Two versions of OxyDetect are available: a General Purpose version suitable for safe area environments such as laboratories, pharmaceutical and industrial gas production; and a Hazardous Area version, suitable for hydrocarbon processing environments.
“The OxyDetect is the life safety product that the market has been waiting for: reliable, stable oxygen sensing that keeps on working,” says Rhys Jenkins, Market Sector Manager, Servomex.
“Paramagnetic oxygen sensing fi nally brings a measurement performance that facilities and operations managers can truly trust, making the safety of people and plant safer, easier and more cost-effective than ever before.”
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Compact and Intrinsically Safe Gas Detector
GfG’s new intrinsically safe G460 is a rugged, compact instrument for simultaneous detection of up to 6 gases. Installed sensor options include infrared (NDIR) for CO2
and PID for VOC measurements. A full 3-year
warranty is provided on most commonly used sensors, which reduces the cost of ownership over the lifetime of the instrument. The G460 offers completely automatic calibration, one-button operation, top mounted display and interchangeable battery packs for up to 25 hours of continuous operation.
The rechargeable NiMH battery pack can even be equipped with optional “fl ash light” LEDs.
The large, high-resolution top display can be fl ipped 180° by pressing two buttons. Its watertight design incorporates an impact proof, rubberised housing to meet the toughest requirements.
The data-logger records over 1,800 gas concentrations and alarms. The data can be downloaded to a PC for viewing, storage and evaluation.
A detachable, self-powered pump is available for sampling confi ned spaces prior to entry. It allows operation of the instrument in diffusion or sample-draw mode.
GfG develops and manufactures a full line of portable gas detectors, fi xed systems and respiratory airline monitors to provide protection from combustible gases and vapours, oxygen hazards and toxic gases.
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SVAN 106 Human Vibration Meter & Analyser
With Svantek every product we innovate provides something new - something you will not have seen or maybe even thought of before. Our SV106 brings you 8-channels in a pocket size vibration instrument.
• ISO 8041:2005, ISO 2631-1,2&5 (including VDV and MTVV) and ISO 5349
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• Six channels for vibration and two channels for contact force
• Hand Arm vibration measurement
• Whole-Body vibration measurement • Tool-mounted, hand-mounted and seat sensor options
• Contact/grip force measurement • Simultaneously measures two tri-axial sensors
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As well as signifi cantly reducing the cost of ownership, the OxyDetect utilises advanced microprocessor diagnostics that are safe, reliable and easy to access via a simple front panel digital interface. With an output range of 0-25% O2
Servomex, the world leader in gas analysis has announced the launch of its upgraded SERVOTOUGH OxyDetect life safety oxygen monitor. Now available as either a hazardous or safe area version with updated communication relay options, the upgraded OxyDetect builds on the success of the original analyser, offering a high accurate oxygen measurement - without the sensor deterioration that degrades the performance of traditional electrochemical sensors used in competitor detectors. OxyDetect utilises the market-leading performance of Servomex’s Hummingbird Paracube Micro Paramagnetic sensor, whose industry-leading levels of linearity, accuracy and reliability have ensured its use as a trusted oxygen sensor for the OEM medical market.
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01234 639551
www.svantek.co.uk sales@svantek.co.uk
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