GAS DETECTION 41


IR gas detector combines high level of accuracy with ease of use and peace of mind


Karf and Scoot’s GD2G infrared gas detectors are high precision instruments that need minimal maintenance and calibration. These highly durable detectors can detect flammable, explosive and toxic gases, without interference from exogenous factors such as temperature, and pressure.


The GD2G features an advanced microcontroller and embedded software algorithm in its design, with the relay outputs designed to operate at the upper and lower alarm levels. This instrument offers 4-20mA analogue output support for easy integration in to existing industrial automation and control systems.


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New, rugged, environmentally sealed case specially developed to accommodate gas cylinder for quick and easy on-site bump testing


Ion Science has launched an optional Premium Plus Case for its range of high performance Tiger handheld photoionisation detectors (PIDs). Capable of holding various PID accessories, the rugged, environmentally sealed Premium Plus Case has been specially developed by Ion Science to accommodate a 34L gas cylinder, allowing quick and easy on-site bump testing of its well proven Tiger volatile organic compound (VOC) monitors.


A bump test is a functional test of a gas monitor. Although not a regulatory requirement, it is the only way to ensure optimum performance of both sensors and monitor before use. It checks that the instrument respond to the challenge gas, verifies the display reacts and confirms that alarms are activated properly. The recommended bump test frequency is normally set by the instrument manufacturer. A bump test works by briefly exposing the instrument to a known concentration of the challenge gas that exceeds alarm settings to confirm the sensor’s ability to respond. The reading is compared to the actual quantity of gas present, as stated on the test gas cylinder. The instrument is working to the required standard if it goes into alarm and reads within an acceptable range of the actual concentration. If the bump tests are not within the acceptable range, the PID must be fully calibrated before use.


Offering a robust and reliable design, the popular Ion Science Tiger handheld PID provides the widest measurement range on the market of 1ppb up to 20,000ppm. It is easy to set up and provides advanced VOC detection and software features. It has a fast response time of just two seconds and can be connected directly to a PC via the USB offering rapid data download capabilities. The TigerLT is a streamlined, low cost version of the Tiger instrument. The entry-level PID also offers worldwide intrinsically safe certification for use in potentially explosive atmospheres and is ideal for environmental surveys. Another handheld gas detector, the Tiger Select boasts two mode operation for the rapid and accurate detection of benzene and total aromatic compounds (TACs). Utilising the Ion Science 10.0eV lamp, a reading for TACs is seen immediately on start-up. Should TACs be detected, a pre-filter tube can be easily attached to ensure rapid detection and selective measurement of benzene.


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50134pr@reply-direct.com Sampling systems for gas measurement in wastewater applications


Water and wastewater organisations have for many years struggled with measuring gases and vapours in sewers over long periods of time. The physical nature of the application creates high levels of corrosive gases, heat, water and high humidity which negatively impact all sensors including catalytic, electrochemical and photo ionisation.


In recent years, PID technology has advanced but the sensor is still directly affected by humidity creating inaccurate readings in this application. There have been many attempts to create filters within the sensor housing, or externally, but most of these have proven ineffective.


The need for sampling in sewer applications has increased over the years, with the desire to use gas sampling as a method to track and trace polluters. By measuring low VOC concentrations, regulatory bodies can determine when an offender has discharged chemicals or solvents into the sewer. PID technology is perfect for this application but the sensor is not useful unless the humidity and water vapour are eliminated from the sampling stream.


Several utilities have been on the forefront in attempting to find a solution. The key is having a system which can eliminate the particulate, reduce humidity and water to a level which sensors can withstand, which will allow accurate measurement and long-term sensor life.


Distributed by CAC GAS Asia, the GSCS (Gas Sample Conditioning System) has been designed to solve these issues. The key elements of liquid, humidity, dust and dirt are managed by the GSCS.


Designed as a sampling system, the GSCS can incorporate single or multiple sensor detection, suited to monitor gas and vapour atmospheres from extreme environments containing temperature, humidity, particulate and pressure challenges. Any sensor technology or manufacturer can be incorporated into the GSCS.


A powerful air aspirator pulls samples from up to 50 metres in distance (longer if required) which is then filtered and conditioned before being passed across one or multiple sensors. System integrity is always maintained using flow fail monitoring devices which provide dry contacts that activate if the sample line becomes blocked, damaged or interrupted. On board communication systems provide information to key personnel.


The system can be designed to accommodate any number of sensors or can be a transportable sampling system which can be used with portable handheld instruments. For applications where a liquid sample is required at the time of high gas exposure, a second pump will be activated drawing up the liquid sample and storing it in a locked compartment of the sampling system. This provides real time liquid sample and gas measurement even when the regulatory team aren’t nearby. Each system is designed for the specific customer requirements. With over 7 years of experience is water/wastewater applications the GSCS is a proven solution to challenging monitoring applications.


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