Engeering Horizon

APPLICATION NOTES

APPLICATION NOTES

May 02
14:38 2015

RETHINKING MAINTENANCE PROCEDURES USING IR THERMOMETERS

Non-contact temperature monitoring is an essential tool for ensuring the safety and reliability of equipment. As alternative solutions to portable thermal imagers, both portable and fixed infrared thermometers are gaining importance in preventive maintenance applications, the latter for example in OEM solutions and for the infrared monitoring of large plants with a multitude of measuring points.

The detection of defects in switchgear, fuses, motors or electrical connections is almost impossible with the naked eye. But we do know that almost any electrical device will get warmer than normal very soon after an anomaly occurs. In complement to portable thermal imagers, highend portable infrared thermometers are now increasingly used for the detection of weak spots. Fixed pyrometers are used predominantly in plants where electrical or mechanical components to be monitored are hard or impossible to reach.

USING PORTABLE PRECISION PYROMETERS FOR PREVENTIVE MAINTENANCE

The handheld infrared thermometer optris Laser Sight LS enables you to verify critical components quickly and easily once you have identified them by means of a thermal imager. This gives you fast inspection capability for temperatures from -32 to 900ºC. The integrated laser sight with crosshairs permits accurate targeting of the measured object and indicates the real measurement spot size. At the touch of a single button the temperature reading appears on the display with a 0.1ºC resolution. An alarm signal is output to indicate temperatures above or below programmed limit values (MAX/MIN function) so that you can systematically scan the measured object and quickly pinpoint the source of the malfunction. One major aspect to be taken into account for all measurements is whether the optics of the infrared thermometer actually are able to acquire the hot spots properly. The optical resolution offered by commercially available infrared thermometers in the low price range is poor, and the dot laser featured by such instruments can be used for sighting only but doesn’t represent the true measurement spot size. As a consequence, the temperatures readings for overheated objects are lower than their real temperatures. So if, for example, a small electrical component experiences an overload condition and heats up excessively, this will only show as a minor temperature rise if the measurement spot is too large, so that potentially hazardous situations will go undetected. Figure 1 shows a correct temperature measurement procedure using the laser/crosshairs technology for monitoring of components in a switch cabinet.

The new two-lens precision optics of the optris Laser Sight LS permit the measurement of very small objects. Switching to the Close Focus Mode enables you to accurately measure targets as small as 1 mm. Sighting is provided by two laser beams intersecting at the close focus point at a distance of 62 mm. So far, instruments available on the market have been designed either for longer measuring distances, or exclusively for small measurement objects. This forced customers to buy either several thermometer models or replacement optics. The optris Laser Sight LS is an all-in-one instrument where you simply flip a selector switch for close focussing.

Optris GmbH  Ferdinand-Buisson-Str. 14  13127 Berlin  Germany

Tel.: +49 30 500 197-0, Fax: +49 30 500 197-10

Email: sales@optris.com, Internet: www.opt.com

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Engineering Horizons

Engineering Horizons

“Engineering Horizons” is the first & leading technical magazine of Pakistan covering Process, Mechanical, Metallurgical, Mining, Electrical & Electronics field under a single cover. We also feel pleasure in saying that this is the only magazine of its own kind & style, which is widely circulated in all Engineering Sectors of Pakistan.

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