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SITRANS T measuring instruments for temperature
Transmitters for rail mounting
SITRANS TW
four-wire system, universal, HART
Thermocouple elements
Measured variable
Measured range
Measured span
Measuring range limits
Thermocouple
• Type B
3
• Type C
• Type D
• Type E
• Type J
• Type K
• Type L
• Type N
• Type R
• Type S
• Type T
• Type U
Voltage measurement
Type of connection
Cold junction compensation
Sensor breakage monitoring
mV sensors
Measured variable
Measured range
Measured span
Input range
Voltage measurement
Overload capacity of inputs
Input resistance
Sensor current
Sensor breakage monitoring
V sources
Measured variable
Measured range
Voltage measurement
Input range/min. span
• Devices with 7NG3242-xxxx1 or
7NG3242-xxxx 0 with U/I plug
• Devices with 7NG3242-xxxx2
• Devices with 7NG3242-xxxx3
Sensor breakage monitoring
3/40
Siemens FI 01 · 2010
© Siemens AG 2009
Temperature
Parameterizable
Min. 50 °C (32.22 °F) x 1/scaling
factor
Depend. on type of thermocouple
element
Pt30 %Rh/Pt6 %Rh (DIN IEC 584)
W5 %-Re (ASTM 988)
W3 %-Re (ASTM 988)
NiCr/CuNi (DIN IEC 584)
Fe/CuNi (DIN IEC 584)
NiCr/Ni (DIN IEC 584)
Fe-CuNi (DIN 43710)
NiCrSi-NiSi (DIN IEC 584)
Pt13 %Rh/Pt (DIN IEC 584)
Pt10 %Rh/Pt (DIN IEC 584)
Cu/CuNi (DIN IEC 584)
Cu/CuNi (DIN 43710)
Special type
(-10 mV ≤ UTC ≤ 100 mV)
Temperature-linear, voltage-linear
or customer-specific
• Normal connection
• Sum connection
• Mean-value connection
• Differential connection
None, internal measurement, exter-
nal measurement or predefined
fixed value
Function can be switched off
DC voltage
Parameterizable
Min. 4 mV
-120 ... +1000 mV
Voltage-linear or customer-specific
Max. ± 3.5 V
≥ 1 MΩ
Approx. 180 µA
Function can be switched off
DC voltage
Parameterizable
Voltage-linear or customer-specific
-1.2 V ... +10 V/0.04 V
-12 V ... +100 V/0.4 V
-120 V ... +140 V/4.0 V
Not possible
µA, mA sources
Measured variable
Measured range
Voltage measurement
Input range/min. span
• Devices with 7NG3242-xxxx4
• Devices with 7NG3242-xxxx5
• Devices with 7NG3242-xxxx6
• Devices with 7NG3242-xxxx7 or
7NG3242-xxxx 0 with U/I plug
• Devices with 7NG3242-xxxx8
Sensor breakage monitoring
Output
Output signal
Current 0/4 ... 20 mA
• Overrange
• Output range following sensor fault -0.5 ... +23.0 mA, continuously
• Load
• Open-circuit voltage
Voltage 0/2 ... 10 V
• Overrange
• Output range following sensor fault -0.25 ... +10.75 V, continuously
• Load resistance
• Load capacitance
• Short-circuit voltage
• Electrical damping
- Adjustable time constant T
63
• Current source/voltage source
Sensor fault/limit signalling
Operation indicator
• Limit violation
• Overrange
Relay output
• Switching capacity
• Switching voltage
• Switching current
Overrange
Limit monitoring
• Operating delay
• Monitoring functions of limit
module
• Hysteresis
DC voltage
Parameterizable
Current-linear or customer-
specific
-12 µA ... +100 µA/0.4 µA
-120 µA ... +1000 µA/4 µA
-1.2 mA ... +10 mA/0.04 mA
-12 mA ... +100 mA/0.4 mA
-120 mA ... +1000 mA/4 mA
Not possible
Load-independent direct current
0/4 ... 20 mA, can be switched to
load-independent DC voltage
0/2 ... 10 V using plug-in jumpers.
-0.5 ... +23.0 mA, continuously
adjustable
adjustable
≤ 650 Ω
≤ 30 V
-0.25 ... +10.75 V, continuously
adjustable
adjustable
≥ 1 kΩ
≤ 10 nF
≤ 100 mA (not permanently short-
circuit-proof)
0 ... 100 s, in steps of 0.1 s
Continuously adjustable within the
total operating range
By operation indicator, relay output
or HART interface
Flashing signal
Flashing frequency 5 Hz
Flashing frequency 1 Hz
Either as NO or NC contact with
1 changeover contact
≤ 150 W, ≤ 625 VA
≤ 125 V DC, ≤ 250 V AC
≤ DC 2.5 A
Signalling of sensor or line break-
age and sensor short-circuit
0 ... 10 s
• Sensor fault (breakage and/or
short-circuit)
• Lower and upper limit
• Window (combination of lower
and upper limits)
• Limit and sensor fault detection
can be combined
Parameterizable between 0 and
100 % of measuring range
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