Specifications

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Siemens FI 01 · 2015 US Edition
Temperature Measurement
Transmitters for mounting in sensor head
SITRANS TH400 fieldbus transmitter
2
System communication
SITRANS TH400, communication interface
■ Technical specifications
Input
Analog-to-digital conversion
• Measurement rate <50ms
• Resolution 24-bit
Resistance thermometer
Pt25 ... Pt1000 to IEC 60751/JIS C
1604
• Measuring range -200 ... +850 °C
(-328 ... +1562 °F)
Ni25 ... Ni1000 to DIN 43760
• Measuring range -60 ... +250 °C
(-76 ... +482 °F)
Cu10 ... Cu1000,  = 0.00427
• Measuring range -50 ... +200 °C
(-58 ... +392 °F)
Line resistance per sensor cable Max. 50 
Sensor current
Nominal 0.2 mA
Sensor fault detection
• Sensor break detection Yes
• Sensor short-circuit detection
Yes, < 15 
Resistance-based sensors
Measuring range 0  ... 10 k
Line resistance per sensor cable
Max. 50 
Sensor current
Nominal 0.2 mA
Sensor fault detection
• Sensor break detection Yes
• Sensor short-circuit detection Yes, < 15 
s
s
Output:
Bus
terminator
Bus
terminator
Segment
coupler
Segment
coupler
Bus connection
Bus connection
PROFIBUS PA
FOUNDATION Fieldbus
SITRANS
TH400 FF
SITRANS
TH400 PA
1
2
1
2
Thermocouple
to IEC 584 Measuring range
•Type B 400 .. +1820 °C (752 ... 3308 °F)
•Type E
-100 ... +1000 °C (-148 ... +1832 °F)
•Type J
-100 ... +1000 °C (-148 ... +1832 °F)
•Type K -100 ... +1200 °C (-148 ... +2192 °F)
•Type N -180 ... +1300 °C (-292 ... +2372 °F)
•Type R -50 ... +1760 °C (-58 ... +3200 °F)
•Type S -50 ... +1760 °C (-58 ... +3200 °F)
•Type T
-200 ... +400 °C (-328 ... +752 °F)
to DIN 43710
•Type L -200 ... +900 °C (-328 ... +1652 °F)
•Type U -200 ... +600 °C (-328 ... +1112 °F)
to ASTM E988-90
•Type W3 0 ... 2300 °C (32 ... +4172 °F)
•Type W5
0 ... 2300 °C (32 ... +4172 °F)
External cold junction compensa-
tion
-40 ... +135 °C (-40 ... +275 °F)
Sensor fault detection
• Sensor break detection Yes
• Sensor short-circuit detection Yes, < 3 mV
• Sensor current in the event of
open-circuit monitoring
4 A
mV sensor - voltage input
Measuring range -800 ... +800 mV
Input resistance 10 M
Output
Filter time (programmable) 0 ... 60 s
Update time
<400ms
Measuring accuracy
Accuracy is defined as the higher
value of general values and basic
values.
General values
Type of input Absolute accu-
racy
Temperature
coefficient
All
0.05 % of the
measured value
0.002 % of
the measured
value/°C
Basic values
Type of input Basic accuracy Temperature
coefficient
Pt100 and Pt1000
0.1 °C 0.002 °C/°C
Ni100
0.15 °C 0.002 °C/°C
Cu10 1.3 °C 0.02 °C/°C
Resistance-based sensors 0.05  0.002 /°C
Voltage source
10 V 0.2 % V/°C
Thermocouple, type:
E, J, K, L, N, T, U
0.5 °C 0.01 °C/°C
Thermocouple, type:
B, R, S, W3, W5
1°C  0.025 °C/°C
Cold junction compensation 0.5 °C
Reference conditions
Warming-up time 30 s
Signal-to-noise ratio Min. 60 dB
Calibration condition
20 ... 28 °C (68 ... 82 °F)
© Siemens AG 2015