Gas Detection 11 Sensitivity of Optical Gas Imaging Cameras Increased
High Sensitivity Mode (HSM) is a technological innovation developed by FLIR Systems to enhance the leak detection performance of their GF- Series optical gas imaging cameras.
FLIR’s proprietary High Sensitivity Mode is based upon an image subtraction video processing technique that effectively enhances the thermal sensitivity of the camera. The HSM feature subtracts a percentage of individual pixel signals from frames in the video stream from the subsequent frames, thus enhancing the differences between frames, which make leaks stand out more clearly in the resulting images. Using the high sensitivity mode even the smallest of gas leaks can be spotted using a FLIR GF Series optical gas imaging (OGI) camera.
FLIR GF Series OGI camera’s offer quick, non-contact measurement of gas leaks in real time. Where many other measuring instruments only present users with a number, GF Series OGI cameras present visual information, making the leak detection process more intuitive. Optical gas imaging cameras can also be used in hard-to-access locations, since they can detect small leaks from a distance. Unlike restricted point measurement provided by ‘gas sniffers’ a GF Series OGI camera allows you to detect gas leakage anywhere within the fi eld of view of the camera. This speeds up the process of inspection for gas leaks considerably.
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Advanced NDIR Sensor for SF6 or Refrigerants Detection
The IR series of infrared gas detection sensors, from N.E.T. (Italy), use the technique of NDIR (Non Dispersive Infrared) to monitor the presence of SF6 or refrigerants. This technique is based on the fact that the gas has a unique and well defi ned light absorption curve in the infrared spectrum that can be used to identify the specifi c gas. The gas concentration can be determined by using a suitable infrared source and by analysing the quantity of energy absorbed from the gas inside the optical path. The IREF-P sensor is equipped with electronics and fi rmware in order to provide an output that is linearised and temperature compensated. The output is analogue voltage type [0.4 V—2 V] dc (other voltages are available on request). IREF P is now SIL2 approved.
The main features are: analogue voltage standard output, incorporated signal, linearisation and temperature compensation suited for instrument manufacturers without any specialist knowledge in IR technology, standard sensor size 32 mm, fast response, solid, rugged construction, wide operating temperature and humidity range (-20°C +60°C) and new optics “Variable Geometry”.
NDIR Sensors are now available for the following detectable gases: SF6, R-1234yf, R-507, R-125, R-134a, R-404a, R-407a, AND R-410a.
Other refrigerants are in development.
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New Residential Line Electrochemical Carbon Monoxide and Nitrogen Dioxide Sensors
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Laser Gas Detection
for NH3 (H2 (H2O), CH4
O), HCl , CO2
...
Environmental Compliance Process Control Research Medical
Visit us at Pittcon 2016 Stand 3919
• Easy OEM integration • High selectivity • Continuous sensor status monitoring
• Hot-wet gas measurements
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The NT-CO-F14 and NT-NO2-F14, from N.E.T. (Italy), are new electrochemical gas sensors with 3 electrodes for the detection of Carbon monoxide (CO) and Nitrogen Dioxide (NO2
). Designed as a
compact and low cost alternative to the standard 20mm sensors, they are targeted to light industrial and commercial applications such as monitoring underground car parks or residential environments, air quality, ventilation control and fi re detection. The sensors have industry accepted dimensions and pin-out footprint, making the sensors compatible with a variety of commercially available fi xed gas detection systems.
UL Recognised Component in accordance with the requirements of UL2075.
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5662ad@reply-direct.com www.envirotech-online.com IET January / February 2016
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