Fig. 34 Measurement Uncertainty For Type J Thermocouple - Beckhoff ELX3312 Operating Manual

Specification type J thermocouple
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. 34: Measurement uncertainty for type J thermocouple
ELX3312 and ELX3314
Type J
±75 mV
-210°C ≈ -8.095 mV ... +1200°C ≈ 69.553 mV
+1200°C
-100°C ... +1200°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 J: app. 0.04°C
± 2.6 K ≈ ± 0.22 %
FSV
± 2.9 K ≈ ± 0.24 %
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
Basic function principles
= 39°C is also shown as the
amb
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