Fig. 31 Measurement Uncertainty For Thermocouple Type B - Beckhoff ELX3312 Operating Manual

Basic function principles
Specification thermocouple type B
Temperature measurement thermo-
couple
Used electrical measuring range
Measuring range, technically usable
Full scale value (FSV)
Measuring range, recommended
PDO LSB
Uncertainty in the @ 23°C
recommended ambient temperature
measuring range,
@ 55°C
with averaging
ambient temperature
Temperature coefficient
(change of measured value with change
of terminal ambient temperature)
Fig. 31: Measurement uncertainty for thermocouple type B
44
Type B
±75 mV
+200°C ≈ 0.178 mV ... +1820°C ≈ 13.820 mV
+1820°C
+750°C ... +1800°C
0.1/0.01°C/digit, depending on PDO setting
Note:
Internally, 16 bits are calculated on the measuring range end
value. Depending on the thermocouple set, there are value jumps
> 0.01°C at "Resolution 0.01°C"; Type B: app. 0.06°C
± 3.7 K ≈ ± 0.20 %
FSV
± 5.1 K ≈ ± 0.28 %
FSV
Since the value is strongly dependent on the sensor temperature,
as can be seen in the specification plot below, it can be derived
from the specification plot. For a better approximation, the
measurement uncertainty at T
average value between 23°C and 55°C to illustrate the non-linear
relation.
Version: 1.3.0
= 39°C is also shown as the
amb
ELX3312 and ELX3314