Endress+Hauser S TMT142R Specifications

Technical Information

Omnigrad S TMT142R

Compact RTD assembly Temperature transmitter for for resistance thermometers, adjusta-

ble via HART

protocol

Application

The temperature assembly TMT142R from the Omnigrad S family is a compact resistance thermometer specifically designed to fulfill the requirements of different process industries such as the chemical, petrochemical and energy but even suitable to other general purpose applications. The thermometer assembly TMT142R consists of a temperature RTD sensor insert (Pt 100) and an electronic two-wire temperature transmitter providing a 4 to 20 mA output, configurable via HART Thanks to the versatility of its product structure, the TMT142R is easily adaptable to various applications in many different industrial processes.

Your benefits

•HART® protocol for operating the device on site using handheld terminal (DXR375) or remotely via the PC

• Illuminated display, rotatable

• Operation, visualization and maintenance with PC, e.g. using FieldCare or ReadWin® 2000 operating software

• Pt 100 sensing element with class A accuracy (IEC

60751) or class1/3 DIN B

• Pt 100 wire wound for use in temperature range

-200 to 600°C (-328 to 1112 °F)

protocol.

• Single Pt 100 with 3 or 4 wires connection

• Undervoltage detection responds immediately, output of falsified measured values is prevented

• Highly accurate in entire operating temperature range

• Sensor monitoring: Failure conditioning, corrosion detection to NAMUR NE 89; Failure conditioning in event of sensor break or sensor short-circuit, adjustable to NAMUR NE 43

• EMC to NAMUR NE 21, CE

• Aluminum or stainless steel (optional) housing with IP67 or NEMA 4x ingress protection degree

• Calibration certificate can be ordered together with the assembly

• Output simulation

• Min./max. process value recorded

• Customized measuring range setup or expanded SETUP, see questionnaire

• Approvals: ATEX (EEx ia, EEx d and dust ignitionproof), CSA (IS, NI, XP and DIP)

0 1

TI128R/09/en 71022415

TMT142R

Function and system design

Measuring principle In the RTD thermometer (Resistance Temperature Detector) the sensing element is an electric resistor with a

100 Ohm resistance value at 0°C (so called Pt 100, according to the IEC 60751 standard norm). The resistance value of a Pt 100 increases with temperature, depending on the physical characteristic of the used material (platinum). In the industrial thermometers, according to the standard IEC 60751, the thermal coefficient of the Pt 100 platinum sensors is α = 3.85*10

-3°C-1

, in the range between 0°C to 100°C.

Measuring system

TMT142R, TMT142C

FieldCare,

RN221N

Commubox

ReadWin 2000

PMC731:PIC0001 Online

>GroupSelect 1 2PV 0.7bar

HELP

DXR375

HART Communication

Example of an application of the compact thermometer

The Omnigrad S HART® TMT142R is a compact thermometer with a two-wire transmitter and an input for resistance thermometers in 3-wire or 4-wire connection, and an analog output. The LC display shows the current measured value digitally and as a bar graph with an indicator for limit value violation. The TMT142R can be operated via the HART

protocol using a handheld terminal (DXR375) or PC (FieldCare or ReadWin® 2000 operating software). The sensor construction is based on the IEC 60751 standard, giving high reliability and performance in all the typical industrial environment conditions. The Pt 100 sensing element is a wire wound type (WW) and is placed in tip of the sensor. The measuring probe (RTD replaceable insert) is installed in a thermowell. Thanks to the spring load construction method, the sensing element is always in contact with the inner tip of the thermowell in order to guarantee the best heat transfer from the process to the sensing element. The transmitter housing is available either in coated aluminum or stainless steel (optional), with or without LC display. The fit between housing, thermowell and cable gland ensures a minimum IP65 (Ingress Protection) grade. The thermowell can be either welded or made from bar-stock material. The thermowells are available in different forms and with many process connections: threads, flanges or weld-in types (see the paragraph “Thermowell”).

Corrosion detection

Sensor connection line corrosion can corrupt the measured value. For this reason, the device gives you the opportunity to detect corrosion for thermocouples and resistance thermometers with a 4-wire connection before measured value corruption takes place.

2 Endress+Hauser

TMT142R

Input

Measured variable Temperature (temperature linear transmission behavior)

Measuring range The transmitter records different measuring ranges depending on the sensor connection and input signals (see

'Type of input').

Type of input

Input Designation Measuring range limits Min. span

Resistance thermometer (RTD)

to IEC 751 (α = 0.00385)

to JIS C1604-81 (α = 0.003916) to DIN 43760 (α = 0.006180)

to Edison Copper Winding No.15 (α = 0.004274) to SAMA (α = 0.003923) to Edison Curve (α = 0.006720) to GOST (α = 0.003911)

to GOST (α = 0.004278)

Pt100

Pt100 (Callendar - van

Dusen)

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

• With 3-wire and 4-wire connection, sensor wire resistance to max. 50 Ω per wire

• Sensor current: ≤ 0.3 mA

-200 to 850 °C (-328 to 1562 °F)

-200 to 649 °C (-328 to 1200 °F)

-100 to 700 °C (-148 to 1292 °F)

-200 to 850 °C (-328 to 1562 °F)

10 K

Response time Tests in water at 0.4 m/s (according to IEC 60751; 23 to 33°C step changes), without thermowell

• t50: 2.5 s

• t90: 7 s

Self heating Negligible

Endress+Hauser 3

Output

Output signal Analog 4 to 20 mA, 20 to 4 mA

Signal on alarm • Underranging:

Linear drop to 3.8 mA

• Overranging:

Linear rise to 20.5 mA

• Sensor break; sensor short-circuit:

≤ 3.6 mA or ≥ 21.0 mA (configurable 21.6 mA to 23 mA)

TMT142R

Load Max. (V

Linearization/transmission behavior

Filter 1

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

Input current required ≤ 3.5 mA

Current limit ≤ 23 mA

Switch-on delay 4 s (during switch-on operation I

power supply

Temperature linear, resistance linear, voltage linear

order digital filter: 0 to 60 s

- 11 V) / 0.022 A (current output)

Power supply

Electrical connection

= 4 mA)

Supply voltage Ub= 11 to 40 V (8 to 40 V without display), reverse polarity protection

Warning! Power must be fed to the device from an 11 to 40 VDC power supply in accordance with NEC Class 02 (low voltage/current) with short-circuit power limit to 8 A/150 VA.

Cable entry See "Product structure"

Residual ripple Perm. residual ripple U

≤ 3 V at Ub ≥ 13.5 V, f

max.

= 1 kHz

4 Endress+Hauser

TMT142R

Accuracy

Response time 1 s per channel

Reference operating conditi-

Calibration temperature: +25 °C ± 5 K (77 °F ± 9 °F)

ons

Maximum measured error Maximum error of the Pt 100 (WW) sensing element

Ê Cl. A 3σ = 0.30+0.0050ItI -200 to 600°C (-328 to 1112 °F)

Ê Cl. 1/3 DIN B 3σ = 0.10+0.0017It|

3σ = 0.30+0.0050ItI

-50 to 250°C (-58 to 482 °F)

-200 to -50 / 250 to 600°C (-328 to -58/482 to 1112 °F)

(ItI=absolute value of the temperature in °C)

Transmitter maximum measured error

Resistance thermometer (RTD)

1) Only with the "Advanced Electronics" option

Physical input range of the sensors

10 to 400 Ω Pt100

Designation

Pt100 0.2 K 0.1 K

Accuracy

digital D/A

0.02%

Repeatability 0.03% of the physical input range (15 Bit)

Resolution A/D conversion: 18 Bit

With the "Advanced Electronics" option:

0.015% of the physical input range (16 Bit)

Influence of supply voltage ≤ ±0.005%/V deviation from 24 V, related to the full scale value

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

Data under reference conditions. % relates to the set span. The larger value applies.

Endress+Hauser 5

+ 11 hidden pages