39
Operating instructions CellaTemp PKx 6x
EN
14.2 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
�
15 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�
15.1 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�