EN
14096788.08 02/2022 EN/DE/FR/ES
30
WIKA operating instructions models TR31-3, TR31-K
Accuracy specifications (4 ... 20 mA version)
Linearisation
Linear to temperature per IEC 60751
Output error
±0.1 %
2)
Reference conditions
Ambient temperature T
a
ref
23 °C
Supply voltage U
B
ref
DC 12 V
1)
Depending on the process connection, the deviation can be bigger.
2) ±0.2 % for start of measuring range less than 0 °C [32 °F]
Example calculation: Total measuring deviation
(measuring range 0 ... 150 °C, load 200 Ω, supply voltage 16 V, ambient
temperature 33 °C, process temperature 100 °C)
Sensor element (class A per IEC 60751: 0.15 + (0.0020(t))):
±0.350 K
Measuring deviation of the transmitter ±0.25 K:
±0.250 K
Output error ±(0.1 % of 150 K):
±0.150 K
Influence of load ±(0.05 % / 100 Ω of 150 K):
±0.150 K
Influence of supply voltage ±(0.025 % / V of 150 K):
±0.150 K
Influence of ambient temperature ±(0.1 % / 10 K T
a
of 150 K):
±0.150 K
Measuring deviation (typical)
sqrt (0.35 K² + 0.25 K² + 0.15 K² + 0.15 K² + 0.15 K²+ 0.15 K²)
sqrt (0.275 K²) = 0.524 K
Measuring deviation (maximum)
0.35 K + 0.25 K + 0.15 K + 0.15 K + 0.15 K + 0.15 K = 1.2 K
12. Specifications
