Endress+Hauser MT127 Specifications
Technical information
iTEMP® Pt100 TMT127
Pt100 Temperature Transmitter for DIN rail mounting
Application
• Temperature transmitter with fixed measuring range
for converting a Pt100 input signal into an analogue,
scalable 4 to 20 mA output signal
Features and benefits
• Fixed measuring range for Pt100
• Two-wire technology, 4 to 20 mA analogue output
• High accuracy in complete ambient temperature range
• Failure information when sensor breaks or shortcircuits as per NAMUR NE 43
• EMC as per NAMUR NE 21, CE
• Ex approval
- ATEX EEx ia, nA
- CSA IS, NI
- CSA GP
- FM IS, NI
• GL Germanische Lloyd / marine approval
• UL recognized component
• Galvanic isolation
â Ó 4
0 1 2
TI095R/09/en
No. 51004790
Function and system design
Measuring principle Electronic acquisition and conversion of input signals in industrial temperature measurement.
®
Measuring system The iTEMP
measuring input for Pt100 in 2, 3, or 4-wire connection.
Pt100 TMT127 DIN rail temperature transmitter is a 2-wire transmitter with analogue output,
Input values
Measured variable Temperature
Measuring range Depending on the application, different measuring ranges can be ordered (see ’Product structure’).
TMT127
Input type
Input Designation Measuring range limits Min. span
Pt100
Resistance
thermometer
(RTD)
as per IEC 60751
• Type of connection: 2, 3 or 4-wire connection
• Cable resistance: sensor cable resistance of max. 40 Ω per cable
• Sensor current: ≤ 0.6 mA
Output values
Output signal Analogue 4 to 20 mA
Signal on alarm • Undershooting measuring range:
linear decrease to 3.8 mA
• Exceeding measuring range:
linear increase to 20.5 mA
• Sensor break; Sensor short-circuit:
≥ 21.0 mA (failure signal is guaranteed > 21.5 mA)
Load Max. (V
Linearisation/transmission behaviour
Temperature linear
Power supply
- 12V) / 0.022 A (current output)
-200 to 850 °C (-328 to 1562 °F) 10 K
Galvanic isolation U = 2 kV AC (input/output)
Induced current requirement ≤ 3.5 mA
Current limitation ≤ 23 mA
Switch-on delay 4 s (during switch-on procedure I
= 3.8 mA)
a
2 Endress+Hauser
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