Endress+Hauser S TC61 Specifications

Technical Information

71105554

Omnigrad S -TC61

Thermocouple thermometer EEx-d certified, replaceable insert, thermowell from pipe, process connection: threaded, flanged or sliding. PCP (4...20 mA), HART® or PROFIBUS-PA® electronics

Range of uses

The Omnigrad S TC61 is an industrial thermometer (thermocouple TC: K or J) and thermowell from pipe, developed for the use in the chemical, petrochemical and energy industries, but suitable also for other generic applications. In compliance to EN 50014/18/20 (ATEX certification) it is therefore particularly suitable also for hazardous areas. When required, it’s also available with a transmitter (PCP, HART® or PROFIBUS-PA®) into the housing. The process connection of the thermowell can be threaded, flanged or with a sliding compression fitting in compliance to the standard rule DIN 43772 (form 2/3, 2G/3G and 2F/3F).

Application areas

• Chemicals industry

• Energy industry

• Gas Processing industry

• Petrochemical industry

• General industrial services

TI285T/02/en

Features and benefits

• Materials: SS 316L/1.4404, SS 316Ti/1.4571, Hastelloy ®C276/2.4819 and Inconel® 600/2.4816

• The most common process connections: threaded, flanged and sliding compression fitting are standard; others are on request

• Customized immersion length

• Surface finishing down to Ra < 0.8 μm

• Aluminium housing, with protection grade from IP66 to IP68

• Thermocouple with hot junction grounded or ungrounded in mineral oxide cable (MgO cable) diameter: 3 or 6 mm

• PCP, HART® and PROFIBUS-PA®, (4...20 mA 2-wire transmitters)

• The accuracy of the TC (K (NiCr-Ni) and J (Fe-CuNi)) are: Cl. 1 - 2 (EN 60584) or Cl. Special - Standard (ANSI MC96.1)

• The TC (K or J) are available in single or double element

• ATEX II 1/2 GD EEx-d IIC certification

• ATEX II 2 GD EEx-d IIC certification

4 0

Omnigrad S -TC61

Function and system design

Measuring principle The thermocouple (TC) thermometer’s sensing element consists of two metal wires that are homogeneous but

different one from the other and insulated along their entire length. The two wires are welded together at one end, known as the “measurement or hot junction”. The other end, where the wires are free, is known as the “cold or reference junction” and is connected to a electromotive force measurement circuit where the force is generated by the different thermoelectric power of each of the thermocouple’s wires if there is a temperature difference between the hot joint (T1) and the cold joint (Seebeck effect). The cold junction has to be “compensated” with reference to the temperature of 0°C (T0). The function that links the electromotive force to the temperatures T1 and T0 is a curve whose characteristics depend on the materials used in the construction of the thermocouple. Some thermocouples curves, and particularly those most reliable for the purposes of industrial readings, are those compliant with standards DIN EN 60584 and ANSI MC96.1.

Equipment architecture The construction of the Omnigrad S TC61 temperature sensor is based on the following standards:

• EN 50014/18 (housing)

• EN 60584 (inset)

• DIN 43772 (thermowell) The housing is in painted aluminium alloy; it is suitable to contain a transmitter and/or the ceramic block of the inset; the “Ingress Protection” is from IP66 to IP68.

The replaceable insert is placed inside the thermowell; the insert is spring loaded to its base in order to improve heat transfer. The hot junction of the thermocouple (type K or J) are positioned close to the tip of the probe. The thermocouple is available in two versions: grounded or ungrounded hot junction. The electrical structure of the thermocouple always complies with DIN EN 60584/61515 or ANSI MC96.1, ASTM E585 standard rules. The thermowell is made from tube with diameter 9, 11 or 12 mm. The final part of the thermowell can be straight, tapered or reduced. The thermowell materials are: SS 316L/1.4404, SS 316Ti/1.4571, Hastelloy 600/2.4816. The process connection of the thermowell can be threaded (GAS or NPT), flanged (DIN or ANSI) or with a compression fitting (see the section "System components").

Fig. 1:TC61 with the various types of process connections and end parts of the probe

®C276/2.4819 and Inconel®

Material & Weight

Operating conditions

Housing Insert Process connection Weight

aluminium epoxy coated

sheath in: SS 316L/1.4404, Inconel® 600/2.4816

fixed or sliding: SS 316L/1.4404, SS 316Ti/1.4571, Hastelloy® C276/2.4819 and Inconel® 600/2.4816

From 0.5 to 1.0 kg for standard options

Performance

Operating condition or test Product type or rules Value or data of test

Ambient temperature housing (without head-mounted transmitter -40÷130°C

housing (with head-mounted transmitter) -40÷85°C

Process temperature It is restricted by the thermowell

material:

Process pressure (Maximum) The pressure values to which the thermowell can be subjected at the

various temperatures are illustrated by the drawings in fig. 2 . For 9 mm diameter pipes, with a limited flow velocity, the maximum tolerated pressures are the following:

Maximum flow velocity The highest flow velocity, (of the stream or of the fluid), tolerated by the thermowell,

diminishes with increasing lengths, of the thermowell/probe exposed (fig. 2 ).

< 600°C SS 316L/1.4404 < 800°C SS 316Ti/1.4571 < 1100°C Hast.® C276/2.4819 -

Inc.600®/2.4816

50 bar to 20°C 33 bar to 250°C 24 bar to 400°C

2 Endress+ Hauser

Omnigrad S -TC61

L=250 mm; Vsteam = 40 m/s

100

100 150 200 250 300

°C

Temperature

Maximum

pressure

allowed

125

150

350

400

Bar

450

Steam pressure

L=220 -> 280 mm; Vwater = 3 m/s

L=220 mm; Vair = 40 m/s

L=280 mm; Vair = 40 m/s

175

200

L=220 mm; Vsteam = 40 m/s

L=280 mm; Vsteam = 40 m/s

form 3

Accuracy

Shock and vibration resistance test

TC Inset in according to the rule IEC 60751:

Acceleration 3 g of peak Frequency from 10Hz to 500Hz and back Time of the

10 hours

test

200

Bar

175

150

125

L = -> mm; Vwater=3m/s250 400

100

L = 250 mm; Vair = 40 m/s

Maximum pressure allowed

L = 400 mm; Vair = 40 m/s

Fig. 2: Pressure/temperature drawing for thermowell with straight tube ø 11 mm in SS 316Ti/1.4571(left), with tapered tube ø 12 mm in SS 316Ti/1.4571 (right)

Thermocouple

and range °C

J (Fe-CuNi)

-40° ... 750°C K (NiCr-Ni)

-40 ... 1200°C

form 2

Steam pressure

L = 250 mm; Vsteam= 40 m/s

L = 400 mm; Vsteam= 40 m/s

100 150 200 250 300

Temperature

Maximum pressure allowed

350

400

450

°C

form 3

Steam pressure

L = 220 -> 280 mm; Vwater=3m/s

L = 220 mm; Vair = 40 m/s

L = 280 mm; Vair = 40 m/s

L = 280 mm; Vsteam = 40 m/s

L = 220 mm; Vsteam = 40 m/s

EN 60584

Class Max deviation Class Max deviation Cable colours

2 +/-2.5°C (-40...333°C)

+/-0.0075 |t| (333...750°C)

2 +/-2.5°C (-40...333°C)

+/-0.0075 |t| (333...1200°C)

1 +/-1.5°C (-40...375°C)

+/-0.004 |t| (375...750°C)

1 +/-1.5°C (-40...375°C)

+/-0.004 |t| (375...1000°C)

+ black

- white + green

- white

ItI = absolute temperature value in °C

Thermocouple

and range °C

J (Fe-CuNi)

0 ...750°C

K (NiCr-Ni)

0...1250°C

Class Max deviation Class Max deviation Cable colours

Stand-

ard

Stand-

ard

+/-2.2°C (0...293°C)

+/-0.75%o(293...750°C)

+/-2.2°C (0...293°C)

+/-0.75%o(293...1250°C)

ANSI MC96.1

Special +/-1.1°C (0...275°C)

+/-0.4%o(275...750°C)

Special +/-1.1°C (0...275°C)

+/-0.4%o(275...1250°C)

+ black

- red

+ yellow

- red

ItI = absolute temperature value in °C

Others errors

Transmitter maximum error See the corresponding documentation (codes at the end of the document) Display maximum error 0.1% FSR + 1 digit (FSR = Full Scale Range)

Response time Tests in water at 0.4 m/s (according to IEC 60751; from 23 to 33°C step changes):

TInsulation

Self heating Negligible when the E+H iTEMP® transmitters are employed.

Endress+Hauser 3

Stem diameter of the insert Sensing element type Temperature of test Response time

SS 316 - d. 6 mm K (NiCr-Ni) or J (Fe-CuNi) t

2,5 s 7,0 s

Measurement Insulation type Result

Insulation resistance between terminals and probe sheath according to EN 60584, test voltage 500 V

> 1GΩ at 25°C > 5 MΩ at 500°C

Installation

The Omnigrad S TC61 thermometers can be installed on pipes or tanks by means of threaded or flanged connections. The immersion length must take into account all the parameters of the thermometer and the process to measure. If the immersion is too low, an error may be generated in the temperature recorded due to the lower temperature of the process fluid near to the walls and heat transfer, which takes place through the sensor stem. In the case of ATEX certified components (transmitter, insert), please refer to the relevant documentation

Omnigrad S -TC61

(refer to the code at the end of this document). The incidence of such an error can be not negligible if there is a big difference between the process temperature and the ambient temperature. To prevent measuring errors of this kind, it is advisable to use thermometer with a small diameter on well and an immersion length (L) of at least 80÷100 mm. In small section ducts the tubing’s axis must be reached and preferibly slightly exceeded by the tip of the probe (see fig. 3A-3C). Insulation of the outer part of the sensor reduces the effect produced by a low immersion. Alternatively, it is also possible to adopt a tilted installation (see fig. 3B-3D). With regard to corrosion, the base material of the wetted parts can tolerate the common corrosive media right up to even the highest temperatures. For a best installation, in the industries, it's better to follow the rule: h ( d, L > D/2 + h.

METALLIC SHEATH

h d/2

Fig. 3: Installation examples

THERMAL INSULATING

L > D/2+h

For further information on specific applications, please contact the E+H Customer Service Department. In the case that the sensor components are disassembled, in the following reassembly procedure the definite torques must be employed. This will assure the housings with the IP grade defined.

System components

Housing The protection housing, our "TA21H", commonly referred to the “connection head”, is used to contain and

protect the terminal block or the transmitter and to join the electric connections to the mechanical component.

The TA21H used for the TC61 is compliant with EN 50014/18 and EN 50281-1-1, EN

½ NPT, NPT

Ø90

Fig. 4: Housing TA21H

G ½", M20x1.5

ø38

ø72

4 Endress+ Hauser

50281-1-2 standards (EEx-d certification for explosion proof type of protection). The matching of the head with the extension below the head and the cover (threaded) ensures a degree of protection from IP66 to

115

IP68. The head also has a chain to connect the body to the cover, which facilitates the use of the instrument during the maintenance on systems. The single or double threaded electrical cable entry can be: M20x1.5, 1/2” NPT or 3/4” NPT, G1/2".

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