IFM Electronic TW2000 - Function; 4�1 Process Measured Signals; 4�2 Emissivity of the Objects to be Measured

5
UK
4 Function
4.1 Process measured signals
• The unit features an IO-Link interface
• The unit displays the measured temperature�
• It generates two output signals according to the parameter setting:
OUT1: switching output / IO-Link Parameter setting
- switching signal: limit values for temperature (→ 10.2.4)
OUT2: analogue output Parameter setting
- analogue signal for temperature (→ 10.2.5)
4.2 Emissivity of the objects to be measured
The infrared temperature sensor reacts to the heat or infrared radiation emitted
from the object� This depends on the material and the surface� To get exact meas-
urement results, the emissivity of the object to be measured has to be set on the
unit (→ 10.2.1 Setting the degree of emissivity)�
The emissivity of an ideal heat radiator (black body) is 100%� The emissivity for
real bodies is below 100 %� The emissivities indicated in the tables (→ 10.2.2
and → 10.2.3) are approximate values� To determine the temperature precisely a
reference value measurement should be made�
The reference value for TW2000 / TW2100 up to a temperature of 250 °C
can be measured using the enclosed label
To compensate environmental influences it may be useful to set a higher
emissivity� Therefore a setting up to 110 % is possible�
An incorrectly set emissivity leads to faults during temperature
measurement�