Instrumentation
data processing technology means makes it possible to automatically eliminate signal disturbance so that they can be used in situations when standard one- or two-channel pyrometers do not give reliable results. These include, for example: measurement of unstable
or moving objects such as molten metals in steelworks, blast furnaces and foundries; measurement of objects with islands of different temperature and/or emissivity on their surface such as slag islands; measurement in environments with varying observation conditions – where dust and smoke can decrease transmittance; and measurement in plants with aggressive process environments. The optical pyrometer measures intensity of radiation
in eight optical bands in visible and near infrared spectral regions with high sampling rate. The instantaneous temperature of radiating material is determined using a special calibration which relates the spectral emissivity of the material to its temperature and reflects the specific conditions in a plant. In the selected time interval, the resulting temperature and its related error are statistically calculated using many measurements performed within a short period of time.
Acquired information about radiation intensity in eight
spectral bands is utilised for elimination of disturbances which negatively influence the accuracy and reliability of the temperature measurement in industrial conditions. In order to eliminate these effects the internal computer of the optical pyrometer performs following operations: recognition and analysis of the particular situation which occurred during the measurement optimisation of the whole measuring process and temperature calculation in accordance with actual conditions; carrying out the corrections of measured data in accordance with the actual conditions; and statistical processing of the experimental data, evaluating the resulting temperature and its error.
Total cost of ownership Lower total cost of ownership is an important competitive advantage in plant and machine construction. The monitoring of operating parameters, for example the pressure and temperature of operating fluids such as hydraulic oil,
lubricants or cooling water, is essential for trouble-free operation, and thus for calculable operating costs. Optimally adjusted operating fluid temperatures help
save energy. And simple, therefore reliable, adjustment and operation of the sensors plays a major role in minimising commissioning and servicing times. Thus great attention was paid to simple operation and good display readability during the design of SICK’s new TBS temperature switch. The TBS combines temperature measurement, limit
temperature detection and in-situ display in a single device (Fig. 1.). It is available with one analogue and up to two digital output signals. In addition to several installation lengths of from 25 to
350 mm, the TBS is also available with four different screw-in threads. Parts in contact with the media are entirely made of stainless steel. The housing can be twisted in two directions for flexible integration in differing installation situations. This permits orderly cable routing and optimum alignment of the display to the operator. The TBS temperature switch has the same look and feel
as its cousin, the PBS pressure switch. SICK says that users will be pleased that the uniform operation of both devices simplifies commissioning as well as parameter adjustment during operation. According to IMF Electronic, monitoring and control of
temperatures is one of the most important measuring tasks in automation and process technology. The correct temperature often influences quality and efficiency of the process. To avoid dangerous states, the temperature must be monitored in many applications. To do so, compact temperature switches and transmitters as well as cable and probe sensors are used that are connected to an external control monitor. In some industrial areas non-contact infrared measuring sensors are used. For its part, IMF Electronic offers temperature switches,
transmitters, self-monitoring temperature transmitters, control monitors, a measure signal converter for temperature sensors, a sensor with adjustable switch points and a sensor with an integrated control monitor. The company also has an extensive selection of clamp and ring fittings, and thermowells. ■
New generation IR cameras O
mega Engineering’s new generation OSXL160 infrared camera (equipped with uncooled focal plan array micro-bolometer) produces a crisp thermal image and accurate temperature reading to help increase system maintenance quality and efficiency in many industries. The OSXL160 thermal imager is packed with advanced features, such as coloured thermal image, voice annotation, sound and colour alarm, FLASH memory storage, USB connection to PC, and analysis software. According to the company, crisp thermal image, accurate temperature reading, clear user interface,
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reliable product quality, and affordable cost makes the OSXL160 the new standard in the infrared imaging industry.
In power plants, the new camera can monitor and diagnose the condition of electrical wire and equipment, detect power leaks, and prevent system malfunctions. In the petrochemical industry it is idea for oil pipeline checks, material interface detection, heat leakage, insulation structures and power equipment detection. Other applications include fire protection and research. Omega also offers the OS499 series dual laser infrared thermometer. For example the
OS499L-12 offers infrared up to 760°C, dual lasers for better targeting, high DS (distance to spot) ratio up to 30:1, colour bar displays temperature in max/min mode, a built-in flashlight, mini thermocouple cocket up to 1400°C, a large LCD with power backlight, hi/ lo temperature audible alarm, and emissivity adjustable from 0.1 to 1.00 (preset at 0.95). The OS499 series are fully functional infrared non-contact temperature measuring devices and compatibility with type K thermocouples. The units’ very long battery life (typically eight days) is obtained from two AAA batteries (included). ■
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