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

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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

Long-term stability • ≤ 0.1 K/year or ≤ 0.05%/year

Values under reference operating conditions. % refer to the set span. The larger value applies.

Installation conditions

Installation instructions Installation location

No restrictions

Environmental conditions

TMT128

Ambient temperature limits

Storage temperature -40 to +100 °C (-40 to 212 °F)

Climate class As per IEC 60654-1, Class C

Degree of protection IP 20

Shock resistance 4g / 2 to 150 Hz as per IEC 60068-2-6

Vibration resistance see ’Shock resistance’

Electromagnetic compatibility (EMC)

Condensation permitted

-40 to +85 °C (-40 to 185 °F), for Ex-area, see Ex-certificate

Shock resistance and interference emission as per IEC 61326 and NAMUR NE 21.

Mechanical construction

Design, dimensions

Values in inch (mm)

4 Endress+Hauser

TMT128

Weight approx. 90 g (3.18 oz)

Material Housing: PC/ABS, UL 94V0

2

Terminals Pluggable screw terminal, max. 2,5 mm

(16 AWG) solid, or strand with wire end sleeve.

Human interface

Display elements Illuminated yellow LED (2 mm, 0.08 in) signals device operation.

Operating elements There are no operating elements available on the device.

Certificates and approvals

CE-Mark The device meets the legal requirements of the EC directives. Endress+Hauser confirms that the device has

been successfully tested by applying the CE mark.

Hazardous area approvals For further details on the available Ex versions (ATEX, CSA, FM, etc.), please contact your Endress+Hauser

sales organization. All relevant data for hazardous areas can be found in separate Ex documentation. If required,
please request copies from your Endress+Hauser sales organization.

GL Ship building approval (Germanischer Lloyd)

Other standards and
guidelines

UL Recognized component to UL 3111-1

• IEC 60529:

Degree of protection provided by housing (IP-Code)

• IEC 61010-1:

Safety requirements for electrical measurement, control and laboratory use.

• IEC 61326-1:

Electromagnetic compatibility (EMC requirements)

•NAMUR:

International user association of automation technology in process industries

Endress+Hauser 5

Ordering information

TMT128

Product structure

TMT128 iTEMP TC DIN rail TMT128

for temperature measurement with TC
Analog output 4 to 20 mA; 2-wire techn.; Galvanic isolation; Failure mode to NAMUR NE 43; 22.5 mm wide; for 35 mm top
hat DIN rail according to IEC 60715; UL recognized, ship building approval GL

Approval

A Non-hazardous area

B ATEX II2(1)G EEx ia IIC T4/T5/T6

C FM IS,NI,Class I,Div.1+2,Group ABCD

D CSA IS,NI,Class I,Div.1+2,Group ABCD

E ATEX II3G EEx nA IIC T4/T5/T6

I FM+CSA IS,NI,Class I,Div.1+2,Group ABCD

J CSA General Purpose

K TIIS Ex ia IIC T5

1 NEPSI Ex ia IIC T4-T6

2 NEPSI Ex nA II T4-T6

Temperature sensor

B Type B ( 400 to 1820 °C, 752 to 3308 °F, min. span 500 K)

C Type C ( 500 to 2320 °C, 932 to 4208 °F, min. span 500 K)

D Type D ( 500 to 2495 °C, 932 to 4523 °F, min. span 500 K)

E Type E (-200 to 1000 °C, -328 to 1832 °F, min. span 50 K)

J Type J (-200 to 1200 °C, -328 to 2192 °F, min. span 50 K)

K Type K (-200 to 1372 °C, -328 to 2501 °F, min. span 50 K)

L Type L (-200 to 900 °C, -328 to 1652 °F, min. span 50 K)

N Type N (-100 to 1300 °C, -148 to 2372 °F, min. span 50 K)

R Type R ( -50 to 1768 °C, -58 to 3214 °F, min. span 500 K)

S Type S ( -50 to 1768 °C, -58 to 3214 °F, min. span 500 K)

T Type T (-200 to 400 °C, -328 to 752 °F, min. span 50 K)

U Type U (-200 to 600 °C, -328 to 1112 °F, min. span 50 K)

Measuring Range

AA 0 to 100 °C (32 to 212 °F)

AB 0 to 150 °C (32 to 302 °F)

AC 0 to 250 °C (32 to 482 °F)

AD 0 to 400 °C (32 to 752 °F)

AE 0 to 600 °C (32 to 1112 °F)

AF 0 to 900 °C (32 to 1652 °F)

AG 0 to 1000 °C (32 to 1832 °F)

AH 0 to 1200 °C (32 to 2192 °F)

AI 0 to 1400 °C (32 to 2552 °F)

AJ 0 to 1600 °C (32 to 2912 °F)

AK 0 to 200 °C (32 to 392 °F)

AL 0 to 300 °C (32 to 575 °F)

AM 0 to 500 °C (32 to 932 °F)

DE -10 to 200 °C (14 to 392 °F)

JA -50 to 200 °C (-58 to 392 °F)

LA -40 to 140 °F

NA 0 to 100 °F

NB 0 to 200 °F

NC 0 to 300 °F

ND 0 to 500 °F

NE 0 to 750 °F

NG 0 to 1000 °F

NI 0 to 1500 °F

NK 0 to 2500 °F

NL 0 to 3200 °F

Additional Option

A Basic version

B Works calibration certificate (6 test points)

TMT128- ⇒ Order code (complete)

This ordering information can give an overview about the available order options. The Endress+Hauser sales
organization can provide detailed ordering information and information on the order code.

6 Endress+Hauser

Accessories

No accessories are required for this device.

Documentation

TMT128

Brochure ’Temperature measurement’ (FA006T09en)
Operating short manual “iTEMP
Ex-Supplementary documentation: ATEX Safety instructions II2(1)G (XA013R09a3)

and II3G (XA018R09a3)

®

RTD/TC DIN rail TMT127/128“ (KA140R09a3)

TMT128

Instruments International

Endress+Hauser
Instruments International AG
Kaegenstrasse 2
4153 Reinach
Switzerland

Tel. [phone]
Fax [phone]
www.endress.com
[e-mail]

TI096R/09/en/10.08
51004792
FM+SGML6.0 / ProMoDo