Endress+Hauser MT188 Specifications

Technical Information
TI 077R/09/en
No.: 510 01792

Temperature head transmitter

iTEMP TC TMT 188

Universal head transmitter for
thermocouples (TC) for installation
in a sensor head Form B

Application areas

• Fixed adjusted temperature head
transmitter for converting TC input
signals into a 4 to 20 mA analogue
output signal

• Input:
Thermocouple (TC)

Features and benefits

• Fixed adjusted measurement range
for thermocouples (TC)

• 2 wire technology,
4to20mAanalogueoutput

• High accuracy in total ambient
temperature range

• Fault signal on sensor break or short
circuit, presettable to NAMUR NE 43

• EMC to NAMUR NE 21, CE

• UL recognized component to UL

3111-1

• GL ship building approval

• Ex-Certification

- ATEX Ex ia and dust zone 22 in

compliance with EN 50281-1

-FMIS

-CSAIS

• Galvanic isolation

Operation and system
construction

Measurement
principle

Measurement system

Electronic measurement and conversion of input signals in industrial temperature
measurement.

The iTEMP TC TMT 188 temperature head transmitter is a two wire transmitter
with an analogue output. It has measurement input for thermocouples (TC).

Input

Output

Thermocouples (TC)

Type Measurement range

B (PtRh30-PtRh6)
C(W5Re-W26Re)
D(W3Re-W25Re)

[3]
[3]

E (NiCr-CuNi)
J (Fe-CuNi)
K (NiCr-Ni)
L (Fe-CuNi)

[2]

N (NiCrSi-NiSi)
R(PtRh13-Pt)
S (PtRh10-Pt)
T(Cu-CuNi)
U(Cu-CuNi)
MoRe5-MoRe41

accord. to IEC 584 Part 1

[2]

[1]

0to+1820°C 32to3308°F
0to+2320°C 32to4208°F
0to+2495°C 32to4523°F

-200 to +915 °C -328 to 1679 °F

-200to+1200°C -328to2192°F

-200to+1372°C -328to2501°F

-200 to + 900 °C -328 to 1652 °F

-270to+1300°C -454to2372°F
0to+1768°C 32to3214°F
0to+1768°C 32to3214°F

-200 to + 400 °C -328 to 752 °F

-200 to + 600 °C -328 to 1112 °F
0to+2000°C 32to3632°F

Cold junction internal (Pt100)
Cold junction

accuracy

±1K

Sensor current 30 mA

Output (analogue)

Output signal 4 to 20 mA
Transmission as temperature linear
Max. load (V

Input current required

Current limit

≤ 3.5 mA

≤ 25 mA

Switch on delay 4 s
Reply time 1 s

power supply

(during power up Ia=3.8mA)

- 8 V) / 0.025 A

min. measurem.
range

500 K (900 °F)
500 K (900 °F)
500 K (900 °F)

50 K (90 °F)
50 K (90 °F)
50 K (90 °F)
50 K (90 °F)

50 K (90 °F)
500 K (900 °F)
500 K (900 °F)

50 K (90 °F)

50 K (90 °F)
500 K (900 °F)

Accuracy

Failure signal (fault monitoring)

Measurement range
undercut

Exceeding
measurement range

Sensor breakage;
Sensor short circuit

Linear drop to 3.8 mA

Linear rise to 20.5 mA

≥ 21.0 mA

Electrical connection

Power supply Ub= 8 to 35 V, polarity protected
Galvanic isolation

(In/out)

Allowable ripple

Û = 3.75 kV AC

U

≤ 5VatUb≥ 13 V, f

ss

max.

=1kHz

Reference conditions Calibration temperature 23 °C ± 5 K

Thermocouple (TC)

Type Measurement accuracy

K, J, T, E, L, U
N, C, D
S, B, R MoRe5-MoRe41

Influence of the internal
reference junction

typ. 0.5 K
typ. 1.0 K
typ. 2.0 K

Pt100 DIN IEC 751 Cl. B

[1] no reference
[2] according to DIN 43710
[3] according to ASTM E988