SIMENS Transmitter SITRANS TW, four-wire technology, Universal, HART
SITRANS TW is a consistent further development of the hundred thousand times proven SITRANS T for the 4wire system in the mounting rail housing. Its many new functions set new standards in temperature transmitters. Its diagnostic and simulation functions provide the necessary clarity during commissioning and operation. Its HART®-interface makes the SITRANS TW easily adaptable to any measuring job with SIMATIC PDM.
Physical values can be preset with the simulation function. This enables testing of the complete signal path right as far as the control system without the need for tools. The drag pointer functions measure the system’s process variable minimum and maximum.
All SITRANS TW control room devices are available in non-intrinsically safe versions and intrinsically safe versions for applications under extreme conditions.
The user-friendly transmitters for the control room
The SITRANS TW universal transmitter is a further development of the service-proven SITRANS T for the 4-wire system in a mounting rail housing. With numerous new functions it sets new standards for temperature transmitters.
With its diagnostics and simulation functions the SITRANS TW provides the necessary insight during commissioning and operation. And using its HART interface the SITRANS TW can be conveniently adapted with SIMATIC PDM to every measurement task.
All SITRANS TW control room devices are available in a non-intrinsically safe version as well as in an intrinsically safe version for use with the most stringent requirements.
| Product No. / Product Description | Listprice / Your price | ||||||
 | 7NG3242-….. SITRANS TW universal transmitter for rail mounting in four-wire system | ||||||
Benefits
- Explosion protection [EEx ia] or [EEx ib] for measurements with sensors in the hazardous area
- Temperature-linear characteristic for all temperature sensors
- Temperature-linear characteristic can be selected for all temperature
sensors - Diagnostic functions
- Slave pointer functions
Application
The SITRANS TW transmitter is a four-wire rail-mounted device with a universal input circuit for connection to the following sensors and signal sources:
- Resistance thermometer
- Thermocouples
- Resistance-based sensors/potentiometers
- mV sensors
- As special version:
- V sources
- Current sources
The 4-wire rail-mounted SITRANS TW transmitter wire is designed for control room installation. It must not be mounted in potentially explosive atmospheres.
All SITRANS TW control room devices are available in a non-intrinsically safe version as well as in an intrinsically safe version for use with the most stringent requirements.
Integration
System configuration
Possible system configurations
The SITRANS TW transmitter as a four-wire rail-mounted device can be used in a number of system configurations: as a stand-alone version or as part of a complex system environment, e.g. with SIMATIC S7. All device functions are available via HART communication.
Communication options through the HART interface:
- HART communicator
- HART modem connected to PC/laptop on which the appropriate software is available, e.g. SIMATIC PDM
- HART-compatible control system (e.g. SIMATIC S7‑400 with ET 200M)
Dimensional drawings
Dimensions for control room mounting, rail mounting in mm (inches)
Function
Features
- Transmitter in four-wire system with HART interface
- Housing can be mounted on 35 mm rail or 32 mm G rail
- Screw plug connector
- All circuits electrically isolated
- Output signal: 0/4 to 20 mA or 0/2 to 10 V
- Power supplies: 115/230 V AC/DC or 24 V AC/DC
- Explosion protection [EEx ia] or [EEx ib] for measurements with sensors in the hazardous area
- Temperature-linear characteristic for all temperature sensors
- Temperature-linear characteristic can be selected for all temperature sensors
- Automatic correction of zero and span
- Monitoring of sensor and cable for open-circuit and short- circuit
- Sensor fault and/or limit can be output via an optional sensor fault/limit monitor
- Hardware write protection for HART communication
- Diagnostic functions
- Slave pointer functions
- SIL 1
Mode of operation
The signal output by a resistance-based sensor (two-wire, three-wire, four-wire system), voltage source, current source or thermocouple is converted by the analog-to-digital converter (1, function diagram) into a digital signal. This is evaluated in the microcontroller (2), corrected according to the sensor characteristic, and converted by the digital-to-analog converter (6) into an output current (0/4 to 20 mA) or output voltage (0/2 to 10 V). The sensor characteristics as well as the electronics data and the data for the transmitter parameters are stored in the non-volatile memory (3).
AC or DC voltages can be used as the power supply (13). Any terminal connections are possible for the power supply as a result of the bridge rectifier in the power supply unit. The PE conductor is required for safety reasons.
A HART modem or a HART communicator permit parameterization of the transmitter using a protocol according to the HART specification. The transmitter can be directly parameterized at the point of measurement via the HART output terminals (10).
The operation indicator (4) identifies a fault-free or faulty operating state of the transmitter. The limit monitor (9) enables the signaling of sensor faults and/or limit violations. In the case of a current output, the current can be checked on a meter connected to test socket (12).
Diagnosis and simulation functions
The SITRANS TW comes with extensive diagnosis and simulation functions.
Physical values can be defined with the simulation function. It is thus possible to check the complete signal path from the sensor input to inside the control system without additional equipment. The slave pointer functions are used to record the minimum and maximum of the plant’s process variable.
Dimensional drawings
Dimensions for control room mounting, rail mounting in mm (inches)
Technical specifications
Input | |
Selectable filters to suppress the line frequency | 50 Hz, 60 Hz, also 10 Hz for special applications (line frequency filter is similar with measuring frequency) |
Resistance thermometer | |
Measured variable | Temperature |
Measuring range | Assignable |
Span | Min. 25 °C (45 °F) x 1/scaling factor |
Sensor type | |
| Pt100 (IEC 751) |
| Pt100 (JIS C1604-81) |
| Ni100 (DIN 43760) |
| Multiples or fractions of the specified basic values can be assigned (e.g. Pt500, Ni120) |
Characteristic curve | Temperature-linear, resistance-linear or customer-specific |
Type of connection |
|
Connection | 2, 3 or 4-wire system |
Measuring range limits | Depending on type of connected thermometer (defined range of resistance thermometer) |
Sensor breakage monitoring | Monitoring of all connections for wire break (function can be switched off) |
Sensor short-circuit monitoring | Configurable response threshold (function can be switched off) |
Resistance-based sensor, potentiometer | |
Measured variable | Actual resistance |
Measuring range | Assignable |
Span | Min. 10 Ω |
Characteristic curve | Resistance-linear or customer-specific |
Type of connection |
|
Connection | 2, 3 or 4-wire system |
Input range | 0 … 6000 Ω; with mean-value and difference circuits: 0 … 3000 Ω |
Sensor breakage monitoring | Monitoring of all connections for wire break (function can be switched off) |
Sensor short-circuit monitoring | Configurable response threshold (function can be switched off) |
Thermocouples | |
Measured variable | Temperature |
Measuring range | Assignable |
Span | Min. 50 ℃ (90 °F) x 1/scaling factor |
Measuring range limits | Depending on type of thermocouple element |
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) | |
Characteristic curve | Temperature-linear, voltage-linear or customer-specific |
Type of connection |
|
Reference junction compensation | None, device-internal measurement, external measurement or predefined fixed value |
Sensor breakage monitoring | Function can be switched off |
mV sensors | |
Measured variable | DC voltage |
Measuring range | Assignable |
Span | Min. 4 mV |
Input range | -120 … +1000 mV |
Characteristic curve | Voltage-linear or customer-specific |
Overload capacity of inputs | Max. ± 3.5 V |
Input resistance | ≥ 1 MΩ |
Sensor current | Approx. 180 μA |
Sensor breakage monitoring | Function can be switched off |
V sources | |
Measured variable | DC voltage |
Measuring range | Assignable |
Characteristic curve | Voltage-linear or customer-specific |
Input range/min. Span | |
| -1.2 … + 10 V/0.04 V |
| -12 … +100 V/0.4 V |
| -120 V … +140 V/4.0 V |
Sensor breakage monitoring | Not possible |
μA-, mA sources | |
Measured variable | DC voltage |
Measuring range | Assignable |
Characteristic curve | Current-linear or customer-specific |
Input range/min. Span | |
| -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 |
Sensor breakage monitoring | Not possible |
Output | |
Output signal | Load-independent direct current 0/4 … 20 mA, can be switched to load-independent DC voltage 0/2 … 10 V using plug-in jumpers |
Current 0/4 … 20 mA | |
| -0.5 … +23.0 mA, infinitely adjustable |
| -0.5 … +23.0 mA, infinitely adjustable |
| ≤ 650 Ω |
| ≤ 30 V |
Voltage 0/2 … 10 V | |
| -0.25 … +10.75 V, infinitely adjustable |
| -0.25 … +10.75 V, infinitely adjustable |
| ≥ 1 kΩ |
| ≤ 10 nF |
| ≤ 100 mA (not permanently short-circuit-proof) |
| |
| 0 … 100 s, in steps of 0.1 s |
| Infinitely adjustable within the entire operating range |
Sensor fault/limit signaling | By operation indicator, relay output or HART interface |
Operation indicator | Flashing signal |
| Flashing frequency 5 Hz |
| Flashing frequency 1 Hz |
Relay outputs | Either as NO or NC contact with 1 changeover contact |
| ≤ 150 W, ≤ 625 VA |
| ≤ 125 V DC, ≤ 250 V AC |
| ≤ 2.5 A DC |
Sensor fault | Signalling of sensor or line breakage and sensor short-circuit |
Limit monitoring | |
| 0 … 10 s |
|
|
| Configurable between 0 and 100 % of measuring range |
Auxiliary power | |
Universal power supply unit | 115/230 V AC/DC or 24 V AC/DC |
Tolerance range for power supply | |
| 80 … 300 V DC; 90 … 250 V AC |
| 18 … 80 V DC; 20.4 … 55.2 V AC (in each case interruption-resistant up to 20 ms in the complete tolerance range) |
Tolerance range for mains frequency | 47 … 63 Hz |
Power consumption with | |
| ≤ 5 VA |
| ≤ 5 W |
| ≤ 5 VA |
| ≤ 5 W |
Electrical isolation | |
Electrically isolated circuits | Input, output, power supply and sensor fault/limit monitoring output are electrically isolated from one another. The HART interface is electrically connected to the output. |
Working voltage between all electrically isolated circuits | The voltage Urms between any two terminals must not exceed 300 V |
Measuring accuracy | |
Accuracy | |
| ≤ 3 °C ± 0.1 °C / 10 °C (≤ 5.4 °F ± 0.18 °F / 18 °F) |
| ≤ 0.5 °C ± 0.1 °C / 10 °C (≤ 0.9 °F ± 0.18 °F / 18 °F) |
| See “Digital error” |
| ≤ 0.05 % of meas. span plus digital error |
Influencing effects (referred to the digital output) | Compared to the max. measuring span: |
| ≤ 0.08 % / 10 °C (≤ 0.08 % / 18 °F) ≤ 0.2 % in the range -10 … +60 °C (14 … 140 °F) |
| ≤ 0.1 % / year |
Influencing effects referred to the analog output IAN or UAN | Compared to the measuring span: |
| ≤ 0.08 % / 10°C (≤ 0.08 % / 18 °F) ≤ 0.2 % in the range -10 … +60 °C (14 … 140 °F) |
| ≤ 0.05 % / 10 V |
| ≤ 0.05 % on change from 50 Ω to 650 Ω |
| ≤ 0.1 % on change in the load current from 0 mA to 10 mA |
| ≤ 0.03 % / month |
Response time (T63 without electrical damping) | ≤ 0.2 s |
Insulation tests | |
Auxiliary power relative to input and output | 3.54 kV DC; 2 s |
Input relative to output and limit monitor | 2.13 kV DC; 2 s |
Output relative to limit monitor | 2.13 kV DC; 2 s |
PE/ground conductor relative to auxiliary power, input, output, and limit monitor | 0.71 kV AC; 2 s |
Electromagnetic compatibility | According to EN 61326 and NAMUR NE21 |
Certificates and approvals | |
Intrinsic safety | |
| II (1) G [Ex ia Ga] IIC |
| II (1) D [Ex ia Da] IIIC |
EC type-examination certificate | TÜV (German Technical Inspectorate) 01 ATEX 1675 |
Other certificates | EAC Ex (GOST) |
Conditions of use | |
Installation conditions | |
Location (for devices with explosion protection) | |
| Outside the hazardous area |
| Within hazardous area Zone 1 (also in Zone 0 in conjunction with the prescribed protection requirements for the sensor) |
Ambient conditions | |
Ambient temperature | -25 … +70 °C (-13 … +158 °F) |
Storage temperature | -40 … +85 °C (-40 … +185 °F) |
Climatic class | |
| 5 … 95 %, no condensation |
Design | |
Weight | Approx. 0.24 kg (0.53 lb) |
Enclosure material | PBT, glass-fibre reinforced |
Degree of protection according to IEC 529 | IP20 |
Degree of protection according to VDE 0100 | Protection class I |
Type of installation | 35-mm DIN rail (1.38 inch) (EN 50022) or 32-mm G-type rail (1.26 inch) (EN 50035) |
Electrical connection / process connection | Screw plug connectors, max. 2.5 mm² (0.01 inch²) |
Parameterization interface | |
Protocol | HART, version 5.9 |
Load with connection of | |
| 230 … 650 Ω |
| 230 … 500 Ω |
Software for PC/laptop | SIMATIC PDM version V5.1 and later |
Digital error
Resistance thermometer
Input | Measuring range | Max. permissible line resistance | Digital error |
|---|---|---|---|
°C / (°F) | Ω | °C / (°F) | |
IEC 751 | |||
| -200 … +850 | 20 | 3.0 (5.4) |
| -200 … +850 | 50 | 0.6 (1.1) |
| -200 … +850 | 100 | 0.3 (0.5) |
| -200 … +850 | 100 | 0.6 (1.1) |
| -200 … +850 | 100 | 1.0 (1.8) |
| -200 … +850 | 100 | 1.0 (1.8) |
JIS C 1604-81 | |||
| -200 … +649 | 20 | 3.0 (5.4) |
| -200 … +649 | 50 | 0.6 (1.1) |
| -200 … +649 | 100 | 0.3 (0.5) |
DIN 43760 | |||
| -60 … +250 | 50 | 0.3 (0.5) |
| -60 … +250 | 100 | 0.3 (0.5) |
| -60 … +250 | 100 | 0.3 (0.5) |
| -60 … +250 | 100 | 0.3 (0.5) |
Resistance-based sensor
Input | Measuring range | Max. permissible line resistance | Digital error |
|---|---|---|---|
Ω | Ω | Ω | |
Resistance (linear) | 0 … 24 | 5 | 0.08 |
0 … 47 | 15 | 0.06 | |
0 … 94 | 30 | 0.06 | |
0 … 188 | 50 | 0.08 | |
0 … 375 | 100 | 0.1 | |
0 … 750 | 100 | 0.2 | |
0 … 1500 | 75 | 1.0 | |
0 … 3000 | 100 | 1.0 | |
0 … 6000 | 100 | 2.0 |
Thermocouples
Input | Measuring range | Digital error 1) |
|---|---|---|
°C / (°F) | °C (°F) | |
Type B | 100 … +1820 | 3 (5.4) |
Type C | 0 … +2300 | 2 (3.6) |
Type D | 0 … +2300 | 1 (1.8) |
Type E | -200 … +1000 | 1 (1.8) |
Type J | -210 … +1200 | 1 (1.8) |
Type K | -200 … +1372 | 1 (1.8) |
Type L | -200 … +900 | 2 (3.6) |
Type N | -200 … +1300 | 1 (1.8) |
Type R | -50 … +1760 | 2 (3.6) |
Type S | -50 … +1760 | 2 (3.6) |
Type T | -200 … +400 | 1 (1.8) |
Type U | -200 … +600 | 2 (3.6) |
1) Accuracy data refer to the largest error in the complete measuring range
Voltage/current sources
Input | Measuring range | Digital error |
|---|---|---|
mV sources (linear) | mV | μV |
-1 … +16 | 35 | |
-3 … +32 | 20 | |
-7 … +65 | 20 | |
-15 … +131 | 50 | |
-31 … +262 | 100 | |
-63 … +525 | 200 | |
-120 … +1000 | 300 | |
V sources (linear) | V | mV |
-1.2 … +10 | 3 | |
-12 … +100 | 30 | |
-120 … +140 | 300 | |
μA/mA sources (linear) | μA/mA | μA |
-12 … +100 μA | 0.05 | |
-120 … +1000 μA | 0.5 | |
-1.2 … +10 mA | 5 | |
-12 … + 100 mA | 50 | |
-120 … +1000 mA | 500 |
