Input type
Min. temperature
Max. temperature
Min. measuring span
Standard
L
-200 °C
+900 °C
50 °C
DIN 43710
Lr
-200 °C
+800 °C
50 °C
GOST 3044-84
N
-180 °C
+1300 °C
50 °C
IEC 60584-1
R
-50 °C
+1760 °C
100 °C
IEC 60584-1
S
-50 °C
+1760 °C
100 °C
IEC 60584-1
T
-200 °C
+400 °C
50 °C
IEC 60584-1
U
-200 °C
+600 °C
50 °C
DIN 43710
W3
0 °C
+2300 °C
100 °C
ASTM E988-96
W5
0 °C
+2300 °C
100 °C
ASTM E988-96
Cold junction compensation (CJC)
Cold junction compensation (CJC)
Constant, internal (default) or external over Pt100 or Ni100
RTD
Temperature range internal CJC
-50 ... +100 °C (-58 ... +212 °F)
Connection external CJC
2-wire, 3-wire or 4-wire
External CJC, wire resistance per wire (for 3-wire and 4-wire
connections)
50 Ω
Effect of the wire resistance (with 3-wire and 4-wire connec‐
tions)
< 0.002 Ω/Ω
Input current external CJC
< 0.15 mA
Temperature range external CJC
-50 ... +135 °C (-58 ... +275 °F)
Cable, wire-wire capacity (CJC and thermocouple)
Max. 50 nF
Total wire resistance
Max. 10 kΩ
Fault detection, programmable
None, short-circuited, broken
CJC: Short-circuited or broken
Note: The short-circuited fault detection only applies to the CJC input.
Fault detection time (TC)
≤ 75 ms (typically 70 ms)
Fault detection time, external CJC (for 3-wire and 4-wire)
≤ 2000 ms
12.2.6.3
Linear resistance
Linear resistance input
SITRANS TH320/TR320/TF320
SITRANS TH420/TR420/TF420
Input range
0 Ω ... 100 kΩ
Min. measuring span
25 Ω
Connection type
2-wire, 3-wire or 4-wire
2-wire, 3-wire or 4-wire
Wire resistance per wire (max.)
50 Ω
Input current
< 0.15 mA
Effect of the wire resistance (with 3-wire
or 4-wire connections)
< 0.002 Ω/Ω
Technical data
12.2 SITRANS TH320/TH420/TR320/TR420/TF320/TF420
SITRANS TH100/TH320/TH420/TR320/TR420/TF320/TF420 with 4 to 20 mA/HART
202
Operating Instructions, 05/2020, A5E41864807-AB
