Endress+Hauser M TC12 Specifications

TI01118T/09/EN/02.19 71443145 2019-06-05

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Technical Information

Omnigrad M TR12, TC12

Modular thermometer

TR12 with resistance insert (RTD) TC12 with thermocouple insert (TC) with thermowell and compression fitting

Application

• Universal range of application

• Measuring range:

• Resistance insert (RTD): –200 to 600 °C (–328 to 1 112 °F)

• Thermocouple (TC): –40 to 1 100 °C (–40 to 2 012 °F)

• Pressure range up to 40 bar (580 psi)

• Degree of protection up to IP68

Head transmitter

All Endress+Hauser transmitters are available with enhanced accuracy and reliability compared to directly wired sensors. Easy customizing by choosing one of the following outputs and communication protocols:

• Analog output 4 to 20 mA

• HART

• PROFIBUS® PA

• FOUNDATION Fieldbus™

Your benefits

• High degree of flexibility thanks to modular design with standard terminal heads

• High degree of compatibility and design as per DIN 43772

• Fast response time with reduced/tapered tip form

• Types of protection for use in hazardous locations:

as per DIN EN 50446 and customer-specific immersion lengths

• Intrinsic Safety (Ex ia)

• Non-sparking (Ex nA)

Function and system design

Measuring principle Resistance thermometer (RTD)

These resistance thermometers use a Pt100 temperature sensor according to IEC 60751. The temperature sensor is a temperature-sensitive platinum resistor with a resistance of 100 Ω at 0 °C (32 °F) and a temperature coefficient α = 0.003851 °C-1.

There are generally two different kinds of platinum resistance thermometers:

• Wire wound (WW): Here, a double coil of fine, high-purity platinum wire is located in a ceramic support. This is then sealed top and bottom with a ceramic protective layer. Such resistance thermometers not only facilitate very reproducible measurements but also offer good long-term stability of the resistance/temperature characteristic within temperature ranges up to 600 °C (1 112 °F). This type of sensor is relatively large in size and it is comparatively sensitive to vibrations.

• Thin film platinum resistance thermometers (TF): A very thin, ultrapure platinum layer, approx. 1 μm thick, is vaporized in a vacuum on a ceramic substrate and then structured photolithographically. The platinum conductor paths formed in this way create the measuring resistance. Additional covering and passivation layers are applied and reliably protect the thin platinum layer from contamination and oxidation, even at high temperatures.

The primary advantages of thin film temperature sensors over wire wound versions are their smaller sizes and better vibration resistance. A relatively low principle-based deviation of the resistance/ temperature characteristic from the standard characteristic of IEC 60751 can frequently be observed among TF sensors at high temperatures. As a result, the tight limit values of tolerance category A as per IEC 60751 can only be observed with TF sensors at temperatures up to approx. 300 °C (572 °F).

Omnigrad M TR12, TC12

Thermocouples (TC)

Thermocouples are comparatively simple, robust temperature sensors which use the Seebeck effect for temperature measurement: if two electrical conductors made of different materials are connected at a point, a weak electrical voltage can be measured between the two open conductor ends if the conductors are subjected to a thermal gradient. This voltage is called thermoelectric voltage or electromotive force (emf.). Its magnitude depends on the type of conducting materials and the temperature difference between the "measuring point" (the junction of the two conductors) and the "cold junction" (the open conductor ends). Accordingly, thermocouples primarily only measure differences in temperature. The absolute temperature at the measuring point can be determined from these if the associated temperature at the cold junction is known or is measured separately and compensated for. The material combinations and associated thermoelectric voltage/temperature characteristics of the most common types of thermocouple are standardized in the IEC 60584 and ASTM E230/ANSI MC96.1 standards.

2 Endress+Hauser

Omnigrad M TR12, TC12

= 20-250V DC/AC

» 50/60Hz

4...20 mA

24V DC / 30 mA

°C

1 2

66a 6b

35 (1.38)

Measuring system

A0009647

 1 Application example

A Thermometer with built-in head transmitter B RIA16 field display unit - The display unit records the analog measuring signal from the head transmitter and

shows this on the display. The LC display shows the current measured value in digital form and as a bar graph indicating a limit value violation. The display unit is looped into the 4 to 20 mA circuit and gets the required energy from there. More information on this can be found in the Technical Information (see "Documentation").

C Active barrier RN221N - The RN221N active barrier (24 V DC, 30 mA) has a galvanically isolated output for

powering 2-wire transmitters. The universal power supply works with an input supply voltage of 20 to 250 V DC/AC, 50/60 Hz, which means that it can be used in all international power grids. More information on this can be found in the Technical Information (see "Documentation").

Design

A0009648

 2 Thermometer design

1 Insert with mounted head transmitter (example with 3 mm (0.12 in)) 2 Insert with mounted ceramic terminal block (example with 6 mm (0.24 in)) 3 Terminal head 4 Protective assembly 5 Process connection: compression fittings TA50, TA70 6 Various tip shapes - for detailed information see "Shape of tip" section: 6a Reduced or tapered tip for inserts with 3 mm (0.12 in) 6b Straight or tapered tip for inserts with 6 mm (0.24 in) L Immersion length IL Insertion length = L + 35 mm (1.38 in)

Thermometers from the Omnigrad M TR12 and TC12 series have a modular design. The terminal head is used as a connection module for the mechanical and electrical connection of the insert. The position of the actual thermometer sensor in the insert ensures that it is mechanically protected. The insert can be replaced or calibrated without interrupting the process. Either ceramic terminal blocks or transmitters can be fitted to the internal terminal block. The thermometer can be mounted on a pipe or tank using a compression fitting. The most commonly used compression fittings are available for installation →  19.

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Input

Omnigrad M TR12, TC12

Measuring range

RTD resistance thermometers

Sensor type Measuring range Connection type Temperature-sensitive

length

Pt100 (IEC 60751, TF) iTHERM StrongSens

Pt100 thin-film sensor (TF) –50 to 400 °C (–58 to 752 °F) 3- or 4-wire 10 mm (0.39 in)

Pt100 wire-wound sensor (WW)

–50 to +500 °C (–58 to +932 °F)

–200 to 600 °C (–328 to 1 112 °F)

3- or 4-wire 7 mm (0.27 in)

3- or 4-wire 10 mm (0.39 in)

TC thermocouples:

Sensor type Measuring range Connection type Temperature-sensitive

length

Thermocouple type K –40 to +1 100 °C

(–40 to +2 012 °F)

Thermocouple type J –40 to +750 °C

(–40 to +1 382 °F)

Grounded or insulated connection

Insert length

Performance characteristics

Operating conditions Ambient temperature range

Terminal head Temperature in °C (°F)

Without mounted head transmitter

With mounted head transmitter –40 to 85 °C (–40 to 185 °F)

With mounted head transmitter and display

Process pressure

The maximum process pressure depends on the process connection used. See the "Process connection" section for an overview of the process connections that can be used→  19.

Maximum flow velocity

The maximum flow velocity tolerated by the thermowell diminishes with increasing immersion of the sensor in the liquid flow. See the figures below for more detailed information.

Depends on the terminal head used and the cable gland or fieldbus connector, see 'Terminal heads' section

–20 to 70 °C (–4 to 158 °F)

4 Endress+Hauser

Omnigrad M TR12, TC12

100 200 300 400 500

v (m/s)

100 200 300 400 500

v (m/s)

12 16 20

12 16

v (ft/s)

L (mm)

L (in)

100

130

165

200

230

260

295

100

115

130

145

L (mm)

L (in)

A0008605

 3 Flow velocity depending on the immersion depth

A Medium water at T = 50 °C (122 °F) B Medium superheated steam at T = 400 °C (752 °F) L Immersion length v Flow velocity ___ Thermowell diameter 9 x 1 mm (0.35 in)

- - - Thermowell diameter 12 x 2.5 mm (0.47 in)

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Omnigrad M TR12, TC12

Shock and vibration resistance

The Endress+Hauser inserts meet the requirements of IEC 60751, which specify shock and vibration resistance of 3g in the range from 10 to 500 Hz.

The vibration resistance at the measuring point depends on the sensor type and design, see the following table:

Version Vibration resistance for the sensor tip

Pt100 (WW or TF) 30 m/s2 (3g)

iTHERM® StrongSens Pt100 (TF)

> 600 m/s2 (60g) for sensor tip

iTHERM® QuickSens Pt100 (TF), version: 6 mm (0.24 in)

1) vibration resistance also applies to the quick-fastening iTHERM QuickNeck

Accuracy

Permissible deviation limits of thermoelectric voltages from the standard characteristic for thermocouples as per IEC 60584 or ASTM E230/ANSI MC96.1:

Standard Type Standard tolerance Special tolerance

IEC 60584 Class Deviation Class Deviation

J (Fe-CuNi) 2 ±2,5 °C (–40 to 333 °C)

±0,0075 |t|

K (NiCr-NiAl) 2 ±2,5 °C (–40 to 333 °C)

±0,0075 |t|

(333 to 750 °C)

(333 to 1 200 °C)

1) |t| = absolute value in °C

Standard Type Standard tolerance Special tolerance

ASTM E230/ANSI MC96.1

J (Fe-CuNi) ±2,2 K or ±0,0075 |t|

K (NiCrNiAl)

Deviation, the larger respective value applies

(0 to 760 °C) ±1,1 K or ±0,004 |t|

±2,2 K oder ±0,02 |t| ±2,2 K or ±0,0075 |t|

(–200 to 0 °C)

(0 to 1 260 °C)

1) |t| = absolute value in °C

1 ±1,5 °C (–40 to 375 °C)

±0,004 |t|

1 ±1,5 °C (–40 to 375 °C)

±0,004 |t|

(375 to 750 °C)

(375 to 1 000 °C)

(0 to 760 °C)

±1,1 K or ±0,004 |t| (0 to 1 260 °C)

6 Endress+Hauser

Omnigrad M TR12, TC12

-200 -100 0 100 200 300 400 500 600°C

0.5

1.0

1.5

2.0

2.5

3.0

- 0.5

- 1.0

- 1.5

- 2.0

- 2.5

- 3.0

Max. deviation (°C)

RTD resistance thermometer as per IEC 60751

Class max. tolerances (°C) Characteristics

RTD maximal error Type TF

Cl. A ± (0,15 + 0,002 · |t|

Cl. AA,

± (0,1 + 0,0017 · |t|) former 1/3 Kl. B

Cl. B ± (0,3 + 0,005 · |t|)

)

1) |t| = absolute value in °C

In order to obtain the maximum tolerances in °F, the results in °C must be multiplied by a factor of 1.8.

Response time

Calculated at an ambient temperature of approx. 23 °C by immersing in running water (0.4 m/s flow rate, 10 K excess temperature):

Complete design:

Thermometer type

Resistance thermometer (measuring probe Pt100, TF/WW)

Diameter t

9 mm (0.35 in) t

11 mm (0.43 in) t

12 mm (0.47 in) t

A0008588-EN

Reduced tip Tapered tip Straight tip

(x)

7.5 s 11 s 18 s

21 s 37 s 55 s

7.5 s not available 18 s

21 s not available 55 s

not available 11 s 38 s

not available 37 s 125 s

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Omnigrad M TR12, TC12

Thermom eter type

Diameter t

(x)

Reduced tip

Thermoco uple

9 mm (0.35 in)

11 mm

5.5 s 9 s 15 s 6 s 9.5 s 16 s

13 s 31 s 46 s 14 s 33 s 49 s

5.5 s not

(0.43 in)

13 s not

12 mm (0.47 in)

not

available

not

available

Response time for insert without transmitter.

Grounded Not grounded

Tapered tip

Straight tip

Reduced tip

Tapered tip

15 s 6 s not

available

46 s 14 s not

available

8.5 s 32 s not

available

9 s 34 s

available

20 s 106 s not

22 s 110 s

available

Straight tip

16 s

49 s

8 Endress+Hauser

Omnigrad M TR12, TC12

Tested in accordance with IEC 60751 in flowing water (0.4 m/s at 30 °C):

Insert:

Sensor type Diameter ID Response time

iTHERM® StrongSens 6 mm (0.24 in) t

3 mm (0.12 in) t

TF sensor

6 mm (0.24 in) t

3 mm (0.12 in) t

WW sensor

6 mm (0.24 in) t

3 mm (0.12 in) t

Thermocouple (TPC100) Grounded

6 mm (0.24 in) t

3 mm (0.12 in) t

Thermocouple (TPC100) Not grounded

6 mm (0.24 in) t

< 3.5 s

< 10 s

2.5 s

5.5 s

5 s

13 s

2 s

6 s

4 s

12 s

0.8 s

2 s

5 s

1 s

2.5 s

7 s

Insulation resistance

Self heating

Calibration

Response time for sensor design without transmitter.

• RTD: Insulation resistance according to IEC 60751 > 100 MΩ at 25 °C between terminals and sheath material measured with a minimum test voltage of 100 V DC

• TC: Insulation resistance according to IEC 1515 between terminals and sheath material with a test voltage of 500 V DC:

• > 1 GΩ at 20 °C

• > 5 MΩ at 500 °C

RTD elements are passive resistances that are measured using an external current. This measurement current causes a self-heating effect in the RTD element itself which in turn creates an additional measurement error. In addition to the measurement current, the size of the measurement error is also affected by the temperature conductivity and flow velocity of the process. This selfheating error is negligible when an Endress+Hauser iTEMP temperature transmitter (very small measurement current) is connected.

Endress+Hauser provides comparison temperature calibration from –80 to +1 400 °C (–110 to +2 552 °F) based on the International Temperature Scale (ITS90).

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