40 Safety
Intrinsically safe transmitters are often designed so that the sensor head can be removed without needing to declassify the area, making calibration, maintenance and repair much easier. For some types of sensing technology, there are specific advantages to not having to house the sensor within a sealed enclosure. For instance, infrared LEL sensors depend on the absorbance of IR light by molecules present in the optical sensing chamber to detect gas. When the absorbance occurs inside a flameproof enclosure, the result is an increase of pressure that potentially adds “noise”
to the detection signal. When the IR sensor is based on an intrinsically safe design, absorbance can occur in an optical sensing chamber that is open to the ambient atmosphere, resulting in less noise and better resolution.
In summary, remember that protection methods are not all the same! Make sure you understand the benefits and liabilities of using fixed versus portable atmospheric monitors, and the protective method that provides the optimal solution before you specify and acquire the monitoring equipment.
Author Contact Details Bob Henderson, GfG Instrumentation, Inc. • Email:
bhenderson@goodforgas.com • Web:
www.gfg-inc.com
about the author Bob Henderson is President of GfG Instrumentation, Inc. in Ann Arbor, Michigan, a division of GfG, mbH, with world- wide headquarters in Dortmund, Germany. Bob has been a member of the American Industrial Hygiene Association since 1992. He is a member of the AIHA Real Time Detection Systems Technical Committee and the AIHA Confined Spaces Committee. He is also a past chair of the Instrument Products Group of the International Safety Equipment Association.
New dual range portable monitor for inerted tank monitoring applications
Crowcon Detection Instruments has launched a new dual range portable monitor to add to its acclaimed Gas-Pro range. Gas-Pro TK has been designed for use in specialist inerted tank environments to monitor levels of flammable gases and oxygen. An environment where standard gas detectors will not work.
Fiona Macrae, Regional Marketing Manager at Crowcon explains, “We have created the new Gas-Pro TK device for the specialist application of monitoring inerted tank spaces during purging or gas freeing. It enables users to monitor the gas mix in tanks carrying flammable gas during transport at sea or on shore, such as oil tankers and oil storage terminals. At 340g, Gas-Pro TK is up to six times lighter than other monitors for this application; a boon if you have to carry it with you all day.”
In Tank Check mode, the Crowcon Gas-Pro TK (rebranded from Tank-Pro), monitors concentrations of flammable gas and oxygen, checking that an unsafe mixture is not developing. It uses dual IR sensor technology which detects the spectrum of possible flammable gas concentrations from high %vol to low %LEL. The device auto-ranges, switching between %vol and %LEL as gas concentration demands, without manual intervention, and notifies the user as it happens.
“What makes this detector special is the fact that the dual IR is not inhibited by high concentrations; nor does it require oxygen to work - unlike catalytic bead sensors which are totally unsuitable for this application”, adds Macrae.
The Gas-Pro TK is available calibrated methane, propane or butane. With IP65 and IP67 ingress protection, Gas-Pro TK meets the demands of most industrial environments. With optional MED certifications, it is a valuable tool for tank monitoring on-board ship. The optional High H?S Sensor addition allows users to analyse possible risk if gases vent during purging, as well as the potential risk from pyrophores. With this option, users can monitor over the 0-100 or 0-1000ppm range.
As with other units in the Gas-Pro range of detectors, Gas-Pro TK has the additional benefit of offering full personal gas detection and confined space pre-entry check functionalities.
The Gas-Pro TK is especially designed to perform in challenging inerted tank environments so it will appeal to health and safety managers responsible for marine fuel tankers and on-shore oil storage terminals and tank farms. This instrument provides atmosphere monitoring whilst purging inerted tank spaces or returning to breathable atmosphere (gas freeing) and is MED approved for vessels covered by the Maritime Equipment Directive. In addition it also has the benefit of offering full personal gas detection and confined space pre-entry check functionalities
New FM6325 approved open-path methane gas detector eliminates false alarms and plant shutdowns
For More Info, email: email:
The new FM approved Senscient ELDS Open-Path Detector is methane specific with an industry leading 0-1 LFL.m measuring range along with a conventional 0-5 LFL.m measuring range option. The 0-1 LFL.m measuring range delivers increased sensitivity and faster executive actions in the event of a gas release.
This laser-based, Class 1, eye-safe solution is less prone to the effects of fog interference providing increased uptime availability. The laser scans a narrower infrared methane absorption line where there is no corresponding absorption from water vapor, which minimizes the effects of fog, rain and snow.
To be FM 6325 Performance Approved, an open-path gas detector must operate under a range of environmental and electrical supply conditions without false alarm. False alarms are a serious problem that can result in excessive plant down-time, which often requires complex investigations and regulatory reporting.
For More Info, email: email:
The Senscient ELDS laser-based open path gas detector is Class I, Div 1, Class I, Zone 1 certified featuring Harmonic Fingerprint™ technology. This patented technology ensures it will only respond to the presence of methane and therefore eliminates false alarms.
To further ensure reliability, the Senscient ELDS Methane Detector is the only device in its class with a built-in, automatic, daily functional test called ‘SimuGas’. This automatic end to end functional test provides confidence of operation and removes the need for site technicians to enter potentially hazardous areas to conduct routine tests.
The Senscient ELDS Methane Detector is available in three path lengths: 16-131 ft (5-40m), 131-394 ft (40-120 m) or 394-656 ft (120-200 m), with a fast speed of response of ≤ 3 seconds (T90).
Methane gas is highly explosive and flammable, and is the primary component of natural gas used throughout industry to power boilers and furnaces, as well as for commercial electric power generation. In addition, methane is a feedstock for butane, propane and ethane production.
The Senscient ELDS Methane Gas Detector is used to monitor fugitive emissions and protect plants from the risk of explosion by detecting leaks faster and over a larger area than is feasible with point detection technologies. This detector is ideal for applications within oil/gas production, refineries, terminals and tank storage, chemical plants, electric power generation and more. They are typically placed around the perimeter of a plant, or process and storage areas, or near equipment, that poses a risk of gas leaks, such as compressors, pumps, pressure reducers, valves and pipe flanges.
For More Info, email: email:
OCTOBER / NOVEMBER •
WWW.PETRO-ONLINE.COM
For More Info, email: email:
46879pr@reply-direct.com
The new FM Approved Senscient ELDS™ Open-Path Gas Detector from MSA resets the safety standard in reliable methane (CH4) gas monitoring, with no false alarms while protecting people, equipment and plants from dangerous methane gas leaks in hazardous industry environments.
47062pr@reply-direct.com
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