Instrumentation
is insensitive to contaminants such as dust, smoke or steam that may partially obstruct the target. Even in cases where the IR radiation beam is weakened to
95 per cent of its original intensity due to smoke or steam, the ratio pyrometer still provides faultless measurements. The pyrometer operates on the two-channel measurement
principle: two integrated IR detection channels with relatively close spacing, but with mutually different measuring wavelengths, produce two independent electrical signals. These signals depend on the IR radiation emitted from
the target and signal components, which are influenced by the optical transmission path between the object and the pyrometer or from changes to the object. By taking the ratio of the two signals, the ratio-pyrometer
principle eliminates (or averages out) any signal parts that are similar in both channels. The measured temperature of the object therefore only depends on the signal ratio and the emissivity ratio, or ‘slope value’. The ratio thermometer principle provides accurate results
when measuring the temperature of objects with unknown or changing emissivity, assuming that the emissivity ratio is not changing over time or temperature. The compact sensor head of the ratio pyrometer has a
diameter of 25 mm and a length of 70mm, enabling it to be mounted into tight, restricted spaces in production lines and machines. Typical applications include the temperature control of
inductive heating coils, temperature measurement of the pouring stream on casting machines during the reheating of
steel ingots and steel billets in forging processes, in general soldering and welding processes and in process steps in semiconductor production and in photovoltaics. Micro-Epsilon offers an optional integrated Profibus DP
interface or other plug-in digital interfaces including USB, RS232, RS485 or Ethernet and software that provides graphical interface and display, the logging of temperature readings of all output channels and signal characteristics over time. Calibration Dynamics has introduced the CTR1000
handheld IR thermometer for the safe, non-contact temperature measurement of hot, difficult-to-reach or mobile objects between 60°C and 1000°C. Equipped with an accuracy of two per cent rdg and a
measuring distance of up to eight metres, the CTR1000 is suitable for applications where thermocouples or resistance thermometers cannot be used. The current measured value is displayed on demand and
has a resolution of 0.1°C. The two-point laser marks the diameter of the measuring area, preventing the measurement of unwanted areas away from the object under surveillance. Variohm EuroSensor has launched its new ETIS line of
non-contact IR temperature sensors with 150ºC, 200ºC and 800ºC temperature ranges. Designed for demanding tyre, brake and exhaust
temperature measurement in autosports but suitable for a wide range of applications throughout industry, the ETIS series has a 1000 G shock rating and is packaged in a lightweight and durable aluminium housing measuring just 20 x 18 x 12 mm and weighing just 26 grams. n
Streamline the entire calibration process with documenting calibrators
B
y using a documenting calibrator, the calibration results are stored automatically in the calibrator’s
memory during the calibration process. The engineer does not have to write any results down on paper and so the whole process is much faster and costs are therefore reduced. Quality and accuracy of calibration results will also improve, as there will be fewer mistakes due to human error. The calibration results are transferred automatically from the calibrator’s memory to the computer/database. This means the engineer does not spend time transferring the results from his notepad to final storage on a computer, again, saving time and money. With instrument calibration, the calibration procedure itself is critical. Performing the calibration procedure in the same way each time is important for consistency of results. With a documenting calibrator, the calibration
procedure can be automatically transferred from the computer to the handheld calibrator before going out into the field. As Heikki Laurila, Product Manager of calibrator manufacturer Beamex, states: “Engineers who are out in the field performing instrument calibrations, get instant pass or fail messages with a documenting
calibrator. The tolerances and limits for a sensor, as well as detailed instructions on how to calibrate the transmitter, are input once in the calibration management software and then downloaded to the calibrator. This means calibrations are carried out in the same way every time as the engineer is being told by the calibrator which test point he needs to measure next. Also, having an easy-to-use documenting calibrator is definitely the way forward, especially if calibration is one of many tasks that the user has to carry out in his or her daily maintenance routine.” Heikki Laurila continues: “With a documenting calibrator such as the Beamex® MC4 Documenting Process Calibrator, the user can download calibration instructions for hundreds of different instruments into the device’s memory before going out into the field. The corresponding calibration results for these instruments can be saved in the device without the user having to return to his PC in the office to download/upload data. This means the user can work for several days in the field.” n
Enter 43 or ✔ at
www.engineerlive.com/epe
Beamex Oy Ab is based in Pietarsaari, Finland.
www.beamex.com
www.engineerlive.com 43
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