Endress+Hauser MT187 Specifications

Technical Information

iTEMP® Pt100 TMT187

Temperature head transmitter
for Pt100 for installation in a sensor head form B

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 Ex ia and dust in compliance with EN 50281-1,
CSA, FM

• Galvanic isolation

0 2 1 â Ó

TI076R/09/en

No. 51001791

Function and system design

Measuring principle Electronic acquisition and conversion of input signals in industrial temperature measurement.

TMT187

Measuring system The iTEMP

measuring input for Pt100 in 2, 3, or 4-wire connection.

®

Pt100 TMT187 temperature head 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’).

Input type

Input Designation Measuring range limits Min. span

Resistance

thermometer

(RTD)

Pt100

as per IEC 751

• Type of connection: 2, 3 or 4-wire connection

• Cable resistance: sensor cable resistance of max. 11 Ω per cable

• Sensor current: ≤ 0.6 mA

-200 to 850 °C (-328 to 1562 °F) 10 K (18 °F)

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 (> 21.5 mA is guaranteed)

Load Max. (V

Linearisation/transmission behaviour

Galvanic isolation U = 2 kV AC (input/output)

Induced current requirement ≤ 3.5 mA

Current limitation ≤ 25 mA

Switch on delay 4 s (during switch on procedure I

Power supply

Temperature linear

- 8 V) / 0.025 A (current output)

= 3.8 mA)

a

2 Endress+Hauser