Instruction manual

SITRANS TW
118 A5E00054075-05
Technical data
CAUTION: For devices with explosion protection the maximum permitted voltages and currents according to the
EC-Type-Examination Certificate have to be observed.
Thermocouples
Measured variable Temperature
Measuring range
Parameterizable
Measuring span
min. 50 °C (90 °F) x 1/scaling fac-
tor
Measuring range limits
Depend. on type of thermocouple
element
Thermocouple element
Type B: Pt30 %Rh/Pt6 %Rh
(DIN IEC 584)
Type C: W5 %-Re (ASTM 988)
Type D: W3 %-Re (ASTM 988)
Type E: NiCr/CuNi (DIN IEC 584)
Type J: Fe/CuNi (DIN IEC 584)
Type K: NiCr/Ni (DIN IEC 584)
Type L: Fe-CuNi (DIN 43710)
Type N: NiCrSi-NiSi (DIN IEC 584)
Type R: Pt13 %Rh/Pt
(DIN IEC 584)
Type S: Pt10 %Rh/Pt
(DIN IEC 584)
Type T: Cu/CuNi (DIN IEC 584)
Type U: Cu/CuNi (DIN 43710)
Special type
(-10 mV  UTC  100 mV)
Characteristic curve
Temperature-linear, voltage-linear
or customer-specific
Type of connection
• Normal connection
• Averaging connection
• Mean-value connection
• Differential connection
Cold junction compensation
None, internal measurement,
external measurement or pre-
defined fixed value
Sensor breakage monitoring
Function can be switched off
mV sensors
Measured variable DC voltage
Measuring range
Parameterizable
Measuring span
min. 4 mV
Input range
-120 ... +1000mV
Characteristic curve
Voltage-linear or customer-spe-
cific
Overload capacity of inputs
max. ± 3.5 V
Input resistance
 1M
Sensor current
Approx. 180 A
Sensor breakage monitoring
Function can be switched off
V sources
Measured variable DC voltage
Measuring range
Parameterizable
Characteristic curve
Voltage-linear or customer-spe-
cific
Input range/min. span
• Devices with 7NG3242-xxxx1 or
7NG3242-xxxx0 with U/I plug
-1.2 ... + 10 V/0.04 V
• Devices with 7NG3242-xxxx2
-12 ... +100 V/0.4 V
• Devices with 7NG3242-xxxx3
-120 ... +140 V/4.0 V
Sensor breakage monitoring
Not possible
A-, mA sources
Measured variable DC voltage
Measuring range
Parameterizable
Characteristic curve
Current-linear or customer-specific
Input range/min. span
• Devices with 7NG3242-xxxx4 -12 ... +100 A/0.4 A
• Devices with 7NG3242-xxxx5
-120 ... +1000 A/4 A
• Devices with 7NG3242-xxxx6
-1.2 ... +10 mA/0.04 mA
• Devices with 7NG3242-xxxx7 or
7NG3242-xxxx0 with U/I plug
-12 ... +100 mA/0.4 mA
• Devices with 7NG3242-xxxx8
-120 ... +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
• Overrange -0.5 ... +23.0 mA, continuously
adjustable
• Output range following sensor
fault (conforming to NE43)
-0.5 ... +23.0 mA, continuously
adjustable
• Load
 650 
• No-load voltage
 30 V
Voltage 0/2 ... 10 V
• Overrange -0.25 ... +10.75 V, continuously
adjustable
• Output range following sensor
fault
-0.25 ... +10.75 V, continuously
adjustable
• Load resistance
 1 k
• Load capacitance
 10 nF
• Short-circuit current
 100 mA (not permanently short-
circuit-proof)
• Electrical damping
- adjustable time constant T
63
0 ... 100 s, in steps of 0.1 s
• Current source/voltage source
Continuously adjustable within
the total operating range
Sensor fault/limit signalling
By operation indicator, relay out-
put or HART interface
Operation indicator
Flashing signal
• Limit violation
Flashing frequency 5 Hz
• Sensor fault monitoring
Flashing frequency 1 Hz
Relay outputs
Either as NO or NC contact with
1 changeover contact
• Switching capacity
 150 W,  625 VA
• Switching voltage
 125 V DC,  250 V AC
• Switching current
 2.5 A DC
Sensor fault monitoring
Signalling of sensor or line break-
age and sensor short-circuit
Limit monitoring
• Operating delay 0 ... 10 s
• Monitoring functions of limit
module
• 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
• Hysteresis
Parameterizable between 0 and
100 % of measuring range