Specifications
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Siemens FI 01 · 2015 US Edition
Temperature Measurement
Transmitter for field mounting/field indicator
SITRANS TF - Transmitter, two-wire system and SITRANS TF - Field indicator for 4 to 20 mA
2
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Technical specifications
Input
Resistance thermometer
Measured variable Temperature
Sensor type
• to IEC 60751 Pt25 … Pt1000
• to JIS C 1604; a=0.00392 K-1 Pt25 … Pt1000
• to IEC 60751 Ni25 … Ni1000
Units °C and °F
Connection
• Normal connection 1 resistance thermometer (RTD)
in 2-wire, 3-wire or 4-wire system
• Generation of average value Series or parallel connection of
several resistance thermometers in
a two-wire system for the genera-
tion of average temperatures or for
adaptation to other device types
• Generation of difference 2 resistance thermometers (RTD)
in 2-wire system (RTD 1 – RTD 2
or RTD 2 – RTD 1)
Interface
• Two-wire system Parameterizable line resistance
100 (loop resistance)
• Three-wire system No balancing required
• Four-wire system No balancing required
Sensor current 0.45 mA
Response time 250 ms for 1 sensor with open-
circuit monitoring
Open-circuit monitoring Always active (cannot be dis-
abled)
Short-circuit monitoring can be switched on/off (default
value: ON)
Measuring range parameterizable (see table "Digi-
tal measuring errors")
Min. measured span 10 °C (18 °F)
Characteristic curve Temperature-linear or special
characteristic
Resistance-based sensors
Measured variable Actual resistance
Sensor type Resistance-based, potentiome-
ters
Units
Connection
• Normal connection 1 resistance-based sensor (R) in
2-wire, 3-wire or 4-wire system
• Generation of average value
2 resistance-based sensors in
2-wire system for generation of
average value
• Generation of difference 2 resistance-based sensor in
2-wire system (R 1 – R 2 or
R2 – R1)
Interface
• Two-wire system Parameterizable line resistance
100 (loop resistance)
• Three-wire system No balancing required
• Four-wire system
No balancing required
Sensor current 0.45 mA
Response time 250 ms for 1 sensor with open-
circuit monitoring
Open-circuit monitoring
Can be switched off
Short-circuit monitoring Can be switched off (value is
adjustable)
Measuring range parameterizable max. 0 ... 2200
(see table "Digital measuring
errors")
Min. measured span 5 ... 25 (see Table "Digital mea-
suring errors")
Characteristic curve Resistance-linear or special char-
acteristic
Thermocouples
Measured variable Temperature
Sensor type (thermocouples)
•Type B Pt30Rh-Pt6Rh to DIN IEC 584
•Type C W5 %-Re acc. to ASTM 988
•Type D W3 %-Re acc. to ASTM 988
•Type E NiCr-CuNi to DIN IEC 584
•Type J Fe-CuNi to DIN IEC 584
•Type K NiCr-Ni to DIN IEC 584
•Type L
Fe-CuNi to DIN 43710
•Type N
NiCrSi-NiSi to DIN IEC 584
•Type R Pt13Rh-Pt to DIN IEC 584
•Type S Pt10Rh-Pt to DIN IEC 584
•Type T Cu-CuNi to DIN IEC 584
•Type U Cu-CuNi to DIN 43710
Units °C or °F
Connection
• Normal connection 1 thermocouple (TC)
• Generation of average value 2 thermocouples (TC)
• Generation of difference 2 thermocouples (TC)
(TC 1 – TC 2 or TC 2 – TC 1)
Response time 250 ms for 1 sensor with open-
circuit monitoring
Open-circuit monitoring Can be switched off
Cold junction compensation
• Internal With integrated Pt100 resistance
thermometer
• External
With external Pt100 IEC 60751
(2-wire or 3-wire connection)
• External fixed
Cold junction temperature can be
set as fixed value
Measuring range
parameterizable (see table "Digi-
tal measuring errors")
Min. measured span
Min. 40 ... 100 °C (72 ... 180 °F)
(see table "Digital measuring
errors")
Characteristic curve Temperature-linear or special
characteristic
mV sensor
Measured variable DC voltage
Sensor type
DC voltage source (DC voltage
source possible over an exter-
nally connected resistor)
Units
mV
Response time
250 ms for 1 sensor with open-
circuit monitoring
Open-circuit monitoring Can be switched off
Measuring range -10 ... +70 mV
-100 ... +1100 mV
Min. measured span 2mV or 20mV
Overload capability of the input
-1.5 ... +3.5 V DC
Input resistance
1M
Characteristic curve Voltage-linear or special charac-
teristic
© Siemens AG 2015