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)
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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
O
I
®
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.
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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
Pt100
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)
-200 to 850 °C (-328 to 1562 °F)
10 K
10 K
10 K
10 K
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
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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
st
order digital filter: 0 to 60 s
- 11 V) / 0.022 A (current output)
Power supply
Electrical connection
= 4 mA)
a
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
ss
max.
= 1 kHz
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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
1
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
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