Measurement preparations
To determine the surface temperature, the tool performs a contactless measurement of the natural infrared thermal radiation emitted by the object at which the tool is aimed. To ensure correct measurement, the emissivity setting on the measuring tool must be checked before every measurement and adapted to the measuring object if necessary.
To change the emissivity, press the emissivity button (13) repeatedly until the emissivity display (e) shows the required emissivity for the next measurement. Confirm your selection by pressing the measure button (1) or with the ON/OFF button/mode button (12).
- High emissivity group (≈ 0.95): Concrete (dry), brickwork (red, rough), sandstone (rough), marble, plastic (PE, PP, PVC), rubber, anodised aluminium (mat), tiles, radiator paint, wood, mortar, roofing felt, wallpaper, adhesive tape, lacquer, plaster
- Medium emissivity group (≈ 0.85): Granite, enamel, cast iron, fireclay, paving stones, textiles, linoleum, paper, fibreboard
- Low emissivity group (≈0.75): Cork, porcelain (white), leather, natural stone
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- Temperature measurements will only be correct if the emissivity setting matches the emissivity of the object. Otherwise, object temperatures could be shown to be hotter or colder than they are, which may present a danger if touched.
The laser circle produced by the measuring tool indicates the measuring surface. The infrared radiation of this measuring surface is then determined when performing a contactless surface temperature measurement.
The central laser point marks the centre of the measuring surface. For an optimum measurement reading, position the measuring tool so that the laser beam meets the measuring surface perpendicularly to this point.
- Do not direct the laser beam at persons or animals and do not stare into the laser beam yourself (even from a distance).
Increasing the distance between the measuring tool and the object being measured increases the size of the laser circle and therefore the size of the area being measured. The optimum measuring distance is 0.75 m to 1.25 m.
- Do not hold the measuring tool directly against hot surfaces. The heat can damage the measuring tool.
The displayed reading is the average value of all temperatures measured within the measuring surface.
Information about the measuring conditions
Highly reflective, shiny or transparent surfaces (e.g. high-gloss tiles, stainless steel cupboard fronts or saucepans) may impair the surface temperature reading. If necessary, mask the area to be measured with a dark, matt adhesive tape that conducts heat well. Allow the tape to acclimatise briefly on the surface.
It is not technically possible to perform measurements through transparent materials.
Consequently, the more suitable and stable the measuring conditions are, the more accurate and reliable the results of the measurement will be.
The humidity and ambient temperature sensor (4) can be damaged by chemical contaminants, such as paint or varnish vapours. Infrared temperature measurement is impaired by smoke, vapour or dusty air.
It is therefore important to ventilate the room prior to measuring, especially when the air is contaminated or steamy. For example, do not perform measurements in a bathroom immediately after the shower has been used.
Once ventilated, allow the room to reacclimatise a while until it returns to the usual temperature.
The ambient temperature and relative humidity are measured directly on the measuring tool at the humidity and ambient temperature sensor (4). To achieve meaningful results, do not hold the measuring tool directly over or next to sources of interference such as radiators or open liquids. Do not cover the sensor (4) under any circumstances.