Endress+Hauser S TC66 Specifications

Technical Information

71105563

Omnigrad S -TC66

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

Range of uses

The Omnigrad S TC66 is an industrial thermometer (thermocouple TC: K or J) with a replaceable inset, a neck and a thermowell from bar stock. It is developed for the use in the chemical, petrochemical and energy industries, but suitable also for other generic heavy duty 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 is threaded or flanged in compliance to the standard of process requirements.

Application areas

• Chemicals industry

• Energy industry

• Gas Processing industry

• Petrochemical industry

• General industrial services

TI289T/02/en

Features and benefits

• Several types of process connection

• Several type of materials available for the thermowells

• Customized immersion length

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

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

• ATEX II 2 GD EEx-d IIC certification

• ATEX II 1/2 GD EEx d IIC certification

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Omnigrad S -TC66

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 TC66 temperature sensor is based on the following standards:

• EN 50014/18 (housing)

• Neck (1 or 2 nipple and 1 "3 union")

• EN 60584 (insert).

• Thermowells standard like: ASTM, DIN, ESSO, ENI, MONTEDISON, ENEL, etc. The housing is in painted aluminium alloy; it is suitable to contain a transmitter and/or the ceramic block of the insert; the “Ingress Protection” is from IP66 to IP68. The neck composed by one or two nipple and one "3 union", standard or EEx- execution, it is the exstension between the head and the thermowell. 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 EN 60584/61515 or ANSI MC96.1/ASTM E585 standard rules. The thermowell is from bar stock, with wetted part, conical, straight or tapered. The process connection is: threaded or flanged, in some case it can be to weld also.

Material & Weight

Operating conditions

Fig. 1: TC66 with the various types of process connections and end parts of the probe

Housing Insert Neck Thermowell Weight

aluminium epoxy coated

sheath in: SS 316L/1.4404 Inconel®600/2.48 16

nipple and 3 union : SS 316/1.4401 or A105

thermowells: SS 316/1.4401, SS 316Ti /1.4571, (Hastelloy C276/2.4819, Monel® 400/2.4360, Inconel® 600/2.4816.)

From 1.5 to 5.0 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

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

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

Shock and vibration resistance test

material:

tures are illustrated by the drawings in fig. 2.

diminishes with increasing lengths, of the thermowell/probe exposed (fig. 2). TC Inset in according to the rule

IEC 60751:

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

Inc.600®/2.4816

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

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Fig. 2: Pressure/temperature grafic for thermowell from bar stock

Omnigrad S -TC66

Accuracy

Thermocouple

and range °C

J (Fe-CuNi)

-40° ... 750°C K (NiCr-Ni)

-40 ... 1200°C

Thermocouple

and range °C

J (Fe-CuNi)

0 ...750°C

K (NiCr-Ni)

0...1250°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)

Class Max deviation Class Max deviation Cable colors

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)

ItI = absolute temperature value in °C

Class Max deviation Class Max deviation Cable colors

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)

ItI = absolute temperature value in °C

EN 60584

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)

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)

Response time Tests, with the TC insert, in water at 0.4 m/s (according to IEC 60751) from 23 to 33°C:

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

Insulation

SS 316 - d. 6 mm K (NiCr-Ni)

J (Fe-CuNi)

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

2,5 s 7,0 s

+ black

- white + green

- white

+ black

- red

+ yellow

- red

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

Endress+Hauser 3

Omnigrad S -TC66

Installation

The TC66 can be installed on pipes, tanks or other heavy duty applications, by means of threaded or flanged connections. The counterparts for process connections and gaskets, when required, are not supplied with the sensor and must be purchased separately by the user. 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. 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 thermowells with a small diameter and an immersion length (U) of at least 100÷150 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).

h ≈ d L > D/2+h

welded coupling

Ød

ØD

Fig. 3: Installation examples

PIPE METALLIC SHEATH

THERMAL INSULATING

For a best installation, in the industries, it's better to follow the rule: h ( d, L > D/2 + h. As far as corrosion is concerned, the base material for parts in contact with the fluid is able to withstand the most common corrosive agents up to the highest temperatures. Even the nipples and 3 elements coupling supplied with the connection fitting of the instrument are able to withstand a wide range of aggressive substances. With regard to corrosion, the base material of the wetted parts (SS 316L, SS 316Ti, Hastelloy

® C276 or Inconel®600) can tolerate the

common corrosive media right up to even the highest temperatures. For further information on specific applications, contact the E+H Customer Service Department. Disassembled components of the sensors must be reassembled with the recommended clamping torques in order to ensure the appropriate IP protection class within the sensor-housing coupling.

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