Endress+Hauser MT128 Specifications
Technical information
iTEMP® TC TMT128
DIN rail mounted Temperature Transmitter
for Thermocouples (TC)
Application
• Temperature transmitter with fixed measuring ranges
for converting TC input signals into an analogue,
scalable 4 to 20 mA output signal
• Input:
Thermocouples (TC)
Features and benefits
• High accuracy: 0.08 % of span
• Breakdown information in event of sensor break
enables a quick maintenance intervention
• Galvanic isolation 2 kV (from the sensor input to the
output)
• Long term stability: < 0.05 %/year
• Electromagnetic compatibility to IEC 61326 for use in
noisy environments
• Ex approvals for high safety standards:
- ATEX EEx ia, nA
- CSA IS, NI
- CSA GP
- FM IS, NI
• GL Germanische Lloyd / marine approval
• UL recognized component to UL 3111-1
â Ó 4
0 1 2
TI096R/09/en
No. 51004792
Function and system design
Measuring principle Electronic acquisition and conversion of input signals in industrial temperature measurement.
®
Measuring system The iTEMP
TC TMT128 DIN rail temperature transmitter is a two-wire transmitter with analog output and
measuring input for thermocouples.
Input values
Measured variable Temperature
Measuring range Depending on the application, different measuring ranges can be ordered (see ’Product structure’).
TMT128
Input type
Input Designation Measuring range limits Min. span
Thermocouples (TC)
1) to ASTM E988
2) to DIN 43710
Output
B (PtRh30-PtRh6)
C (W5Re-W26Re)
D (W3Re-W25Re)
E (NiCr-CuNi)
J (Fe-CuNi)
K (NiCr-Ni)
L (Fe-CuNi)
N (NiCrSi-NiSi)
R (PtRh13-Pt)
S (PtRh10-Pt)
T (Cu-CuNi)
U (Cu-CuNi)
to IEC 60584 part 1
• Internal cold junction (Pt100)
• Accuracy of cold junction: ±1 K
• Sensor current: = 350 nA
1)
1
2)
2
0 to +1820 °C (32 to 3308 °F)
0 to +2320 °C (32 to 4208 °F)
0 to +2495 °C (32 to 4523 °F)
-270 to +1000 °C (-454 to 1832 °F)
-210 to +1200 °C (-346 to 2192 °F)
-270 to +1372 °C (-454 to 2501 °F)
-200 to +900 °C (-328 to 1652 °F)
-270 to +1300 °C (-454 to 2372 °F)
-50 to +1768 °C (-58 to 3214 °F)
-50 to +1768 °C (-58 to 3214 °F)
-270 to +400 °C (-454 to 752 °F)
-200 to +600 °C (-328 to 1112 °F)
500 K
500 K
500 K
50 K
50 K
50 K
50 K
50 K
500 K
500 K
50 K
50 K
Output signal Analog 4 to 20 mA
Breakdown information Breakdown information to NAMUR NE 43
Breakdown information is created when the measuring information is invalid or not present anymore and gives
a complete listing of all errors occuring in the measuring system.
Signal (mA)
Under ranging Standard 3.8
Over ranging Standard 20.5
Sensor break To NAMUR NE 43 ≥ 21.0
1) if output setting is ≥ 21.0 mA, > 21.5 mA is guaranteed
Source impedance Max. (V
power supply
- 12V) / 0.022 A (current output)
1)
e. g. (24 V - 12 V)/0.022 A = 545.5 Ω
Transmission behavior Temperature linear
2 Endress+Hauser
TMT128
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
Power supply
Electrical connection
Temperature transmitter terminal assignment
Supply voltage Ub= 12 to 35 V, reverse polarity protection
Residual ripple Permitted residual ripple U
≤ 3V at Ub ≥ 15V, f
ss
max.
= 1 kHz
Accuracy
Response time 1 s
Reference operating conditions
Maximum measured error
Influence of supply voltage • ≤ ±0.01%/V deviation from 24 V
Influence of ambient temperature (temperature drift)
Influence of load • ± 0.02%/100 Ω
Calibration temperature: +25 °C (77 °F) ± 5 K
Designation Accuracy
K, J, T, E, L, U
Thermocouples (TC)
1) % refer to the set span. The highest value is valid.
N, C, D
S, B, R
Percentages refer to the full scale value.
• Thermocouple (TC):
= ±(50 ppm/K * max. measuring range + 50 ppm/K * of set measuring range) * Δ ϑ
T
d
Δ ϑ = deviation of the ambient temperature from the reference operating condition (25 °C (77 °F) ± 5 K).
Values refer to the full scale value.
1)
typ. 0.5 K or 0.08%
typ. 1.0 K or 0.08%
typ. 2.0 K or 0.08%
Endress+Hauser 3
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