Instrumentation
resolution at up to 3072 pixels per channel. The colour quality is ensured by well separated colour filters of high spectral response, on-chip white balancing, and spatially corrected colour channels output. In addition, to eliminate interference from different light sources used for 3D and colour imaging, there is a filter option for light source separation.
Expanded process views Raytek, a worldwide provider of IR thermometry and maker of the industry-leading ThermoView Ti30 infrared camera, has introduced the Thermoview Pi20 process imager and DataTemp Pi (DTPi) software. This easy-to-use thermal imaging solution provides an
expanded view of process performance in a wide range of industrial applications (Fig. 2). Designed for automated monitoring and control of
continuous or stationary targets, the ThermoView Pi20 fixed- mounted process imager provides a process view of thermal images, allowing plant operators to shorten process start-up times and lower production line changeover costs. The camera is paired with the intuitive DTPi software, which minimises or eliminates the long learning curve associated with many process imaging systems. The ThermoView Pi20 camera and DataTemp Pi software
are designed for use in diverse and often rugged industrial settings. During solar module testing, for example, the thermal imaging system allows early detection of defective solar cells. It also enables manufacturers to improve productivity and energy generation from solar modules. In the tobacco industry, the system helps to reduce waste from improperly dried tobacco and prevent fires caused by smouldering tobacco stored in bunkers. The thermal imaging camera and software also detect unquenched clinkers on coke conveyers, and identify hot spots during pressboard production and garbage incineration. Featuring an IP54 rating, the rugged ThermoView Pi20 camera is offered in two temperature ranges: -40 to 500°C and 200 to 2000°C. For each temperature range, two lens options are available: 21.7° x 16°, or 30° x 22°. The ThermoView Pi20 provides easy networking over long distances using a standard Ethernet interface, which transmits up to 30 frames per second of imaging data from the camera. Additional fibreoptic Ethernet accessories enable Ethernet
cable runs beyond 90 m, thus eliminating the need to place the PC operating DataTemp Pi software in a hazardous area. These features reduce the user’s capital investment costs by eliminating the need for specialised enclosures and expensive industrial computers to survive in a harsh field environment, says the company. According to Omega, whether used for communications or
IR temperature measurement, fibreoptics offer some inherent advantages for measurements in industrial and/or harsh environments: These include: unaffected by electromagnetic interference (EMI) from large motors, transformers, welders and the like; unaffected by radio frequency interference (RFI) from wireless communications and lightning activity; can be positioned in hard-to-reach or view places; can be focused to measure small or precise locations; does not or will not carry electrical current (ideal for explosive hazard locations); fibre cables can be run in existing conduit, cable trays or be strapped onto beams, pipes or conduit (easily installed for expansions or retrofits); and certain cables can handle ambient temperatures to over 300°C – and higher with air or water purging. As such, the company says that fibreoptic thermometers
have proven invaluable in measuring temperatures in basic metals and glass productions as well as in the initial hot forming processes for such materials. Boiler burner flames and tube temperatures as well as critical turbine areas are typical applications in power generation operations. Rolling lines in steel and other fabricated metal plants also pose harsh conditions which are well handled by fibreoptics.
Sintering operations Other typical applications include furnaces of all sorts, sintering operations, ovens and kilns. Automated welding, brazing and annealing equipment often generate large electrical fields which can disturb conventional sensors. Meanwhile IFM Electronic’s range of temperature
sensors are designed to meet a number of requirements: precise temperature measurement by Pt1000 sensor element; integrated or separate control monitors selectable; modular concept – tailor-made for every application; optional fittings for variable process connection; and robust mechanics with high resistance to vibration and shock The company’s sensors are all based on a Pt1000 resistor. The measured temperature value corresponds to a change in
Multichannel optical pyrometers P
rague Precision’s multichannel optical pyrometer is designed for continuous and automatic temperature measurement of molten metals and other hot materials. The determination of temperature is based on an original method of signal processing which eliminates negative disturbances that may occur during the temperature measurement. Its resistant mechanical construction guarantees a reliable performance under hard industrial conditions.
The computer controlled operation enables to incorporate the optical pyrometer as an integral
part of central control systems.
The company says that this original method of signal processing means that its pyrometer can be used in situations where one- or two- channel pyrometers would not be able to give reliable results. These include:
■ Measurement of unstable or moving objects such molten metals in steelworks, blast furnaces and foundries;
■ Measurement of objects with islands of different temperature and/or emissivity on their surface, for example slag islands;
■ Measurement in environments with varying observation conditions created by, for example, dust and smoke gusts and other obstacles to clear observation, intensive light sources, and decreasing transmittance of the entrance window;
■ Measurement in technological plants with aggressive environments including heat emission, vibrations, dust and hot metal drops; and
■ Measurement which may be influenced by unintentional and/or intentional interference with the pyrometer operation. ■
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