i-OnTemp User Manual
Rev 1.0
Pg. 20
10.
FAQ & Trouble shooting
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Why is the temperature on the screen much lower than the average human temperature?
Thermal imaging processes an image based on the energy emitted off objects in the field of view. This will include a person, hot
air from a heater, a computer or a cool gust of wind from an air conditioner. Unlike a thermometer – which measures absolute
temperature – a thermal imager will show the temperature in relative terms. As in – what is my temperature relative to the
person next to me. To do this we need to establish the baseline temperature, either with a black body, or by using three healthy
individuals as described in the setup instructions. Once we’ve established that baseline, the temperature gradient can be
measured very accurately.
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Why does the temperature change when a person stands at different ranges camera?
Since the camera is aggregating all the energy it is receiving in the field of view, the temperature reading will change. The
optimal range for a 6.8 millimeter lens on the camera is 2-3 meters (6-9 feet). It can be used effectively up to 5 meters (15 feet),
but it’s important to make sure the temperature of a person is measured at the exact distance that the baseline was established.
If your setup is designed to read temperatures of people at 3 meters, for example, make sure that it was calibrated during the
setup for people at that range.
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Why can’t I hear the alert?
Make sure the monitor volume is turned on and alert sound is enabled in app. The sound comes out through the HDMI cable.
Thus it goes into the monitor.
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Why after some time does the temperature of the same individuals change?
Although the camera’s steady state takes about 8-10 minutes, it may take another hour or so to truly reach a point where the
temperature stops shifting. After an hour, it is recommended to check the temperature and recalibrate the threshold
accordingly. Also, since the ambient temperature changes during the day, it is recommended to repeat the process once every 8
hours.
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Can the ThermApp be used outside?
Yes. But you need to adjust the ambient temperature in accordance with the outside temperature as it will probably not be 25
degrees, and you may need to recalibrate the ambient temperature and the baseline as the day progresses and temperatures
change. Also, avoid a field of view which is looking at a street in which vehicles (which are hot objects) could pass through it.
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I’m not getting a temperature reading and the screen says “overflow”
This occurs if an object in the screen surpasses 60°c (140°F), which is beyond our calibration range. Remove the object and check
again.
