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Operating instructions
15.2 Error indications
Overload output
The corresponding LED OUT 1 will flash at
4 Hz. The display shows "
SC1
" at 2 Hz.
Overtemperature
Display
ot
alternately shows overtempera-
ture and measurement reading at = 0.5 Hz.
The corresponding LED flashes at 4 Hz when
the output is switched off.
Incorrect connection of
supply voltage
LED OUT 1 flashes at 2 Hz.
Supply voltage
≤ approx. 16 V
LED, display, switching output and analogue
output are deactivated.(When voltage ≥ 16 V
the device switches on and the switching
outputs are activated).
Temperature below lower
threshold
The display shows
UL
.
Temperature above upper
threshold
The display shows
0L
.
16 Theory of Non-Contact Temperature Measurements
All materials radiate thermal energy in all states of aggregation above absolute
zero. This radiation is mainly caused by atomic or molecular oscillations.
This temperature radiation is only a limited sector within the total electromagnetic
radiation spectrum. It extends from the visible range starting at wavelengths of
approx. 0.5 μm to the infrared range with wavelenghs of more than 40 μm. Radia
-
tion pyrometers detect infrared radiation for non-contact temperature measurement.
16.1 Advantages of Non-Contact Temperature Measurement
• Non-contact temperature detection means cost-effective temperature measure-
ment because this technique only requires a single in-vestment in an instrument
without any follow-up costs for consumables such as thermocouples.
• This method enables temperature detection of moving objects - quick temper-
ature measurements within milliseconds - for example at automatic welding
processes.
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