LAPP AUTOMAATIO EPIC Sensors Mineral Insulated Thermocouple Insert User Manual

LAPP AUTOMAATIO EPIC Sensors Mineral Insulated Thermocouple Insert

Product description and intended use

Sensor types T-M-313 and T-M-314 (thermocouple, TC) are mineral-insulated thermocouple inserts with connector, constructed according to DIN 43721.
Sensors are intended for various industrial measuring applications, to be immersed to process/object or attached to a surface to be measured. The construction allows very versatile use cases.

Mineral insulated inserts with connectors are used in applications, where wiring connection must be quickly removable. Another reason for choosing the connector structure is possibility to easily move the sensor from measuring point to another.

Measuring elements are mineral-insulated (MI) elements, which are bendable. Standard versions are K, N or J-type thermocouples. Sensor element protection tube material can be chosen, and element/cable length can be produced according to customer needs. Tailored versions are produced on request.
Sensors are available with STD connectors (round pins, type designation -313-) or with MINI connectors (flat pins, for up to Ø4,5 mm elements, type designation -314-). The connector type must be chosen according to the thermocouple type of the element. The connector color changes depending on the thermocouple type, according to standard EN 60584.

Also available as ATEX and IECEx approved protection type Ex i versions. Please see section Ex i data.
EPIC® SENSORS temperature sensors are measuring devices intended for professional use. They should be mounted by professionally capable installer who understands the installations surroundings. The worker should understand mechanical and electrical needs and safety instructions of the object installation. Suitable safety gear for each installation task must be used.

Temperatures, measuring

Allowed measuring temperature range for sensor tip is:

• -200…+1200 °C, depending on TC type and sensor element material.

Temperatures, ambient

Allowed maximum ambient temperature for assembled connector is normally:

• +180 °C, higher temperature versions on request.

Make sure the process temperature is not too much for connectors and connected wiring.

Temperatures, Ex i versions
For Ex i versions only (type designations -EXI-), specific temperature conditions apply according to the ATEX and IECEx certificates. For more details, please see section: Ex i data (only for types with Ex i approval).

Code key

Dimensional drawing

Technical data

Materials
These are the standard materials of components for the sensor types T-M-313, T-M-314.

• Connector pins and sockets Thermocouple Metal Alloy, depending on TC type
• Connector body Glass Polyamide
• Sensor element / MI cable sheath AISI 316L or INCONEL 600

Other materials can be used on request.

Installation instructions and example

Before any installation, make sure the target process/machinery and site are safe to work!
Make sure the cable type matches the temperature and chemical requirements of the site.

Installation phases:

• During installation, remember the MI element minimum bending radius is 2x ØOD of the element.
• Insert the measuring element to atmosphere/medium/material or on surface to be measured.
• Mount the sensor securely with application-specific mounting accessories.
• Make sure there is no excess strain or bending force loading the connector.
• Mount extra enclosure/protection for connector, if necessary.

Image below: this example shows a sensor installed with an adjustable coupling on a welded threaded sleeve on process piping.

Tightening torques
Use only tightening torques allowed in applicable standards of each thread size and material.

Installation of accessories

Connectors:
As accessories there are thermocouple connectors available, as components.

These connectors have male or female contacts, made of alloys suitable for a certain thermocouple type. The connector body is also colored depending on the TC type, e.g. type K connector body is green, because type K cable sheath is green, according to standard IEC 60584.
The maximum temperature for these connectors is +200 °C, if not specified otherwise.
There are two sizes of TC connectors: standard (STD) and miniature (MINI).
TC connectors available are: (Other types are quoted upon request.)

Product Type            number

• 911476                      J-STD-Female
• 911475                      J-STD-Male
• 911477                      J-MINI-Female
• 911478                      J-MINI-Male
• 911440                      K-STD-Female
• 911439                      K-STD-Male
• 911442                      K-MINI-Female
• 911441                      K-MINI-Male
• 1089977                    N-STD-Female
• 1089978                    N-STD-Male
• 1023763                   S-STD-Female
• 1083322                   S-STD-Female 350°C
• 1023764                   S-STD-Male
• 1083323                   S-STD-Male 350°C
• 1017789                  Cable clamps for STD connectors

STD dimensions:

MINI dimensions:

Adjustable gland couplings AISI 316:
As accessories there are adjustable gland couplings available, for occasions where the sensor should be installed to a threaded hole in process.
Gland couplings – a.k.a. compression fittings – are used with sensing inserts or sensors without wells. The immersion depth of sensing insert can be adjusted, when installing on a thread. Compression fittings have metal ferrules inside. Ferrules are made of stainless steel SS316L (other materials and sizes available upon request). Single or double ferrules are used depending on the inner diameter. By screwing the cap down, the ferrule is permanently pressed on the sensing element. This connection is pressure resistant, which is also reason for the alias name; compression fitting.

Installation phases:

• Screw the coupling in an applicable thread hole.
• Tighten securely with the lower nut.
• Insert the sensor element as far as needed through the coupling.
• NOTE! After next phase there is no coming back, the tightened connection is permanent!
• If you are absolutely sure about the depth, screw down the cap (upper nut) to fix the depth.
• For tightening use only enough force needed. Excess force may damage the sensor element and lower the tightness of the connection.

Some of the many available gland couplings are:

Product Type –             thread – inner diameter number

• 875823                 Compression fitting G½ – 6 mm
• 1001171               Compression fitting G½ – 12 mm
• 914413                 Compression fitting G½ – 15 mm
• 1010922               Compression fitting G¼ – 1.5 mm
• 911898                Compression fitting G¼ – 3 mm
• 911897                Compression fitting G¼ – 4.5 mm
• 920701                Compression fitting G¼ – 6 mm
• 920587                Compression fitting G⅛ – 1.5 mm
• 919178                Compression fitting G⅛ – 3 mm
• 1090957              Compression fitting G⅛ – 1 mm
• 1062720              Compression fitting M8x1 – 1.5 mm
• 911908                Compression fitting M8x1 – 3 mm
• 1040461              Compression fitting M18x1.5 – 6 mm
• 914237                Compression fitting NPT¼ – 3 mm.
• 1066586              Compression fitting NPT¼ – 6 mm
• 1001559              Compression fitting NPT⅛ – 3 mm
• 1066584               Compression fitting NPT⅛ – 6 mm

TC; connection wiring

Image below: These are the connection colors of TC types J, K and N.

Other types on request.

TC; non-grounded or grounded types
Normally the thermocouple sensors are non-grounded, which means the MI cable sheath is not connected to the thermo material hot junction, where two materials are welded together.
In special applications also grounded types are used.
NOTE! Non-grounded and grounded sensors cannot be connected to same circuits, make sure you are using the right type.
NOTE! Grounded TCs are not allowed for Ex i certified sensor types.
Image below: Non-grounded and grounded structures in comparison.

Non-grounded TC

Thermo material hot junction and MI cable sheath are galvanically isolated from each other.

Grounded TC

Thermo material hot junction has galvanic connection with MI cable sheath.

TC; thermocouple cable standards (color table)

Type label of standard versions

Each sensor has a type label attached to. It is a moisture and wear proof industrial grade sticker, with black text on white label. This label has printed information as presented below.

Image below: Example of a standard sensor type label.

Serial number information
Serial number S/N is always printed on type label in the following form: yymmdd-xxxxxxx-x:

• yymmdd production date, e.g. “210131” = 31.1.2021
• -xxxxxxx production order, e.g. “1234567”
• -x sequential ID number within this production order, e.g. “1”

Ex i data (only for types with Ex i approval)
This sensor type is available also with ATEX and IECEx Ex i approvals. Assembly consists of a temperature sensor with applicable thermocouple connector (sensor type designation -EXI-). All relevant Ex data is given below.

Ex i – Special Conditions for Use
There are special specifications and conditions for use defined in certificates. These include e.g. Ex data, allowed ambient temperatures, and self-heating calculation with examples. These are presented in Annex A: Specification and special conditions for use – Ex i approved EPIC®SENSORS temperature sensors.

Ex i certificates and Ex markings

Certificate – Number| Issued by| Applicable area| Marking
---|---|---|---
ATEX –

EESF 21 ATEX 043X

| Eurofins Electric & Electronics Finland Oy, Finland,

Notified Body Nr 0537

| Europe| Ex II 1G Ex ia IIC T6…T3 Ga

Ex II 1/2G Ex ib IIC T6…T3 Ga/Gb Ex II 1D Ex ia IIIC T135 °C Da

Ex II 1/2D Ex ib IIIC T135 °C Da/Db

IECEx – IECEx EESF 21.0027X| Eurofins Electric & Electronics Finland Oy, Finland,

Notified Body Nr 0537

| Global| Ex ia IIC T6…T3 Ga

Ex ib IIC T6…T3 Ga/Gb Ex ia IIIC T135 °C Da

Ex ib IIIC T135 °C Da/Db

Note! Name change of the Notified Body Nr 0537:

• Until 31.3.2022, the name was: Eurofins Expert Services Oy
• As of 1.4.2022, the name is: Eurofins Electric & Electronics Finland Oy.

Ex i type label
For ATEX and IECEx Ex i approved versions there is more information on the label, according to applicable standards.

Image below: Example of an ATEX and IECEx Ex i approved sensor type label.

EU Declaration of Conformity
The EU Declaration of Conformity, declaring products‘ conformance to the European Directives, is delivered with products or sent on request.

Manufacturer contact information

Manufacturer HQ main office:
Lapp Automaatio Oy
Street address                           Martinkyläntie 52
Postal address                          FI-01720 Vantaa, Finland

Production site and logistics:

Lapp Automaatio Oy
Street address             Varastokatu 10
Postal address            FI-05800 Hyvinkää, Finland

Phone (sales) +358 20 764 6410

Email epicsensors.fi.lav@lapp.com
Https www.epicsensors.com

Document history

Although every reasonable effort is made to ensure the accuracy of the content of the operating instructions, Lapp Automaatio Oy is not responsible for the way the publications are used or for possible misinterpretations by end users. The user must ensure that she or he has the latest edition of this publication.

We reserve the right to make changes without prior notice. © Lapp Automaatio Oy

Ex data for RTD (resistance temperature sensor) and TC (Thermocouple temperature sensor)

Sensor Ex data, maximum interface values, without transmitter or / and display.

Table 1. Sensor Ex data.

For sensors with long cable part, the parameters Ci and Li must be included in the calculation. Following values per meter can be used according to EN 60079-14: Ccable = 200 pF/m and Lcable = 1 μH/m.

II 1G Ex ia IIC T6 Ga

II 1/2G Ex ib IIC T6-T3 Ga/Gb

| T6| -40…+80 °C
II 1G Ex ia IIC T5 Ga

II 1/2G Ex ib IIC T6-T3 Ga/Gb

| T5| -40…+95 °C
II 1G Ex ia IIC T4-T3 Ga

II 1/2G Ex ib IIC T6-T3 Ga/Gb

| T4-T3| -40…+100 °C

Marking, Dust Group IIIC| Power Pi| Ambient temperature
II 1D Ex ia IIIC T135 °C Da

II 1/2D Ex ib IIIC T135 °C Da/Db

| 750 mW| -40…+40 °C
II 1D Ex ia IIIC T135 °C Da

II 1/2D Ex ib IIIC T135 °C Da/Db

| 650 mW| -40…+70 °C
II 1D Ex ia IIIC T135 °C Da

II 1/2D Ex ib IIIC T135 °C Da/Db

| 550 mW| -40…+100 °C

Table 2. Ex i temperature classes and allowed ambient temperature ranges

Note!
The temperatures above are without gable glands. The compatibility of cable glands must be according to the application specifications.
If the transmitter and/or display will be inside the transmitter housing, the specific Ex requirements of the transmitter and/or display installation must be noted.
The used materials must comply the needs of application, e.g., abrasion, and the temperatures above. For EPL Ga Group IIC the aluminium parts in connection heads are subject to sparking by impacts or friction.
For Group IIIC the maximum input power Pi shall be observed.
When the sensors are mounted across boundary between different Zones, refer to standard IEC 60079-26 section 6, for ensuring the boundary wall between different hazardous areas.

Considering sensor self-heating
Self-heating of the sensor tip shall be considered in respect with Temperature Classification and associated ambient temperature range and manufacturer’s instructions for calculating tip surface temperature according to thermal resistances stated in the instructions shall be observed.
Allowed ambient temperature range of sensor head or process connection for Groups IIC and IIIC with different temperature classes are listed in Table 2. For Group IIIC the maximum input power Pi shall be observed.

The process temperature shall not adversely affect ambient temperature range assigned for Temperature Classification.
Calculation for self-heating of the sensor at the tip of sensor or the thermowell tip
When the sensor-tip is located at environment where the temperature is within T6…T3, it is needed to consider the self-heating of the sensor. Self-heating is of particular significance when measuring low temperatures.

The self-heating at the sensor tip or thermowell tip depends on the sensor type (RTD/TC), the diameter of sensor and structure of sensor. It is also needed to consider the Ex i values for the transmitter. The table 3. shows the Rth values for different type of sensors structure.

Table 3. Thermal resistance based on Test report 211126

Note!
If the measuring device for RTD-measuring is using measuring current > 1 mA, the maximum surface temperature of the temperature sensor tip should be calculated and taken to account. Please see next page.
If sensor type has multiple sensing elements included, and those are used simultaneously, note that the maximum power for all sensing elements should not be more than the allowed total power Pi.
Maximum power must be limited to 750 mW. This must be guaranteed by process owner. (Not applicable for Multi-point temperature sensor types T-MP / W-MP or T-MPT / W-MPT with segregated Exi circuits).

ANNEX A – Specification and special conditions for use – Ex i approved EPIC® SENSORS temperature sensors

Calculation for maximum temperature:
The self-heating of the sensor tip can be calculated from formula:

Tmax= Po × Rth + MT

• (Tmax) = Maximum temperature = surface temperature at the sensor tip
• (Po) = Maximum feeding power for the sensor (see the transmitter certificate)
• (Rth) = Thermal resistance (K/W, Table 3.)
• (MT) = Medium temperature.

Calculate the maximum possible temperature at the tip of sensor:

Example 1 – Calculation for RTD-sensor tip with thermowell

Sensor used at Zone 0

• RTD sensor type: W-M-9K . . . (RTD-sensor with head-mounted transmitter).
• Sensor with thermowell, diameter of Ø 9 mm.
• Medium temperature (MT) is 120 °C
• Measuring is made with PR electronics head mounted transmitter 5437D and isolated barrier PR 9106 B.
• Maximum temperature (Tmax) can be calculated by adding the temperature of the medium that you are measuring and the self-heating. The self-heating of the sensor tip can be calculated from the Maximum power (Po) which is feeding the sensor and Rth-value of used sensor type. (See the Table 3.)
• Supplied power by PR 5437 D is (Po) = 23,3 mW (from the transmitter Ex-certificate)
• Temperature class T4 (135 °C) must not be exceeded.
• Thermal resistance (Rth) for the sensor is = 55 K/W (from Table 3).
• Self-heating is 0.0233 W * 55 K/W = 1,28 K
• Maximum temperature (Tmax) is MT + self-heating: 120 °C + 1,28 °C = 121,28 °C
• The result in this example shows that, the self-heating at the sensor tip is negligible.
• The safety margin for (T6 to T3) is 5 °C and that must be subtracted from 135 °C; means that up to 130 °C would be acceptable. In this example the temperature of class T4 is not exceeded.

Example 2 – Calculation for RTD-sensor tip without the thermowell.

• Sensor used at Zone 1
• RTD sensor type: W-M-6/303 . . . (RTD-sensor with cable, without head-mounted transmitter)
• Sensor without thermowell, diameter of Ø 6 mm.
• Medium temperature (MT) is 40 °C
• Measuring is made with rail-mounted PR electronics PR 9113D isolated transmitter/barrier.
• Maximum temperature (Tmax) can be calculated by adding the temperature of the medium that you are measuring and the self-heating. The self-heating of the sensor tip can be calculated from the Maximum power (Po) which is feeding the sensor and Rth-value of used sensor type. (See the Table 3.)
• Supplied power by PR 9113D is (Po) = 40,0 mW (from the transmitter Ex-certificate)
• Temperature class T3 (200 °C) must not be exceeded.
• Thermal resistance (Rth) for the sensor is = 100 K/W (from Table 3).
• Self-heating is 0.040 W * 100 K/W = 4,00 K
• Maximum temperature (Tmax) is MT + self-heating: 40 °C + 4,00 °C = 44,00 °C
• The result in this example shows that, the self-heating at the sensor tip is negligible.
• The safety margin for (T6 to T3) is 5 °C and that must be subtracted from 200 °C; means that up to 195 °C would be acceptable. In this example the temperature of class
• T3 is not exceeded.

Additional information for Group II devices: (acc. to EN IEC 60079-0: 2019 section: 5.3.2.2 and 26.5.1)

• Temperature class for T3 = 200 °C
• Temperature class for T4 = 135 °C
• Safety margin for T3 to T6 = 5 K
• Safety margin for T1 to T2 = 10 K.

Note!
This ANNEX is an instructional document on specifications.
For original regulatory data on specific conditions for use, always refer to ATEX and IECEx certificates:

• EESF 21 ATEX 043X
• IECEx EESF 21.0027X

References

• Etusivu | EPIC® SENSORS
• Lapp Automaatio | Lapp Automaatio
• Frontpage | EPIC® SENSORS
• Frontpage | EPIC® SENSORS
• Lapp Automaatio | Lapp Automaatio

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