nVent RAYCHEM Elexant 5010i, 5010i-LIM Field Controller Instruction Manual

: October 30, 2023
: nVent RAYCHEM

nVent RAYCHEM Elexant 5010i, 5010i-LIM Field Controller

nVent-RAYCHEM-Elexant-5010i,-5010i-LIM-Field-Controller-
PRODUCT

Product Information

Elexant 5010i & Elexant 5010i-LIM

The Elexant 5010i & Elexant 5010i-LIM are functional safety-approved products from nVent. The Elexant 5010i has a SIL 2 (1oo1) certification, while Elexant 5010i-LIM has a UL 22 ATEX 2446X and IECEx UL 22.0034X certification. These products are designed for use in fixed installations and are made of glass fiber-reinforced polyester with an internal earth metallic plate on the bottom. They have IP66 to IEC 60529 protection and can be installed in any position, although typical use is with glands facing down. The products have 3 x M25 threaded entries and are suitable for use with PT100 temperature sensors, RS-485 communication, and internal earth stud.

Product Usage Instructions

Before starting to use the product, please read all instructional literature carefully and thoroughly. The following instructions should be followed for safe use of the product:

Tools Required for Installation

The following tools are required for installation:

3 mm tool
7 mm tool
25 mm tool*
36 mm tool**

Dimensions

Refer to Figure 2 for the dimensions of Elexant 5010i & Elexant 5010i-LIM:

Installation

Follow the steps below for installation:

Ensure that the product is suitable for the area of use.
Make the manufacturer aware of any external effects or aggressive substances that the equipment may be exposed to.
Ensure that the cable glands are used only for fixed installations and that the cables are fixed to prevent pulling or twisting.
Connect the RS-485 cable coming from the previous device to the Elexant 5010i & Elexant 5010i-LIM using the PE, N, and L terminals.
Connect the RS-485 cable going to the next device to the Elexant 5010i & Elexant 5010i-LIM using the PE, N, and L terminals.
Connect the PT100 temperature sensor(s) to the Elexant 5010i & Elexant 5010i-LIM using the W, R, R, and PE terminals.
If the device is the last on the communication wire, install a wire bridge between the – and T terminal as shown by the straight line.
Install an internal end-of-line resistor using the PE terminal.

Note: The maximum alarm heater is 3 A.

Ordering Information

The following product names are available for ordering:

Elegant 5010i
Elegant 5010i-LIM
Elegant 5010i (EAC)
Elexant 5010i-LIM (EAC)

Refer to the product manual for more information on technical data, certifications, warranty, and limitations of warranty.

Tools

Figure 1:

For 20 mm gland

Dimensions

Figure 2:

connection diagram

Figure 3:

RS-485-Kabel vom vorherigen

Elexant 5010 i & Elexant 5010 i LIM

UL 22 ATEX 2446X

| II 2 G Ex eb ib mb [ib] IIC T4 Gb II 2 D Ex tb [ib] IIIC T67°C Db IP66

–50°C ≤Tamb ≤+60°C

IECEx UL 22.0034X| Ex eb ib mb [ib] IIC T4 Gb Ex tb [ib] IIIC T67°C Db IP66
*Functional safety approval (Elexant 5010 i)**
CSA FSP 21016|
SIL 2 (1oo1)|

Warning:
The purchaser should make the manufacturer aware of any external effects or aggressive substances that the equipment may be exposed to.
The cable glands shall only be used for fixed installations, the cables must be fixed to prevent pulling or twisting.

Important Notice: In case a failure of the safety system is detected either during operation or during routine maintenance when executing a function test the unit should be switched off and taken out of service. Defects in the safety system cannot be repaired
in the field. Defective units are to be replaced and returned to the manufacturer for investigation. Please contact your nearest nVent representative for more instructions. A list of worldwide representations can be found on the last page of this document or on
nVent.com/RAYCHEM
Please read all instructional literature carefully and thoroughly before starting.
Notice: The information contained in this document is subject to change without notice. Please read these Installation Instructions before commissioning the instrument. Keep the instructions in a place which is always accessible to all users. Please assist us to improve these instructions, where necessary. We are always grateful for your suggestions. Should any difficulties arise during
start-up, you are asked not to carry out any unauthorized manipulations on the instrument as this could affect your warranty rights! Please contact the nearest nVent subsidiary or the head office. If any servicing is required, the instrument must be returned to the head office.

Special conditions for safe use

Cable entry shall be Ex eb and tb ATEX certified and rated minimum IP66 to maintain the IP66 rating of the enclosure. Cable entry devices must have a seal or gasket to provide sealing with the enclosure.
Unused cable entries must be filled with Ex eb and tb ATEX certified and rated minimum IP66 stopping plugs to maintain the IP66 rating of the enclosure. Cable entry plugs must have a seal or gasket to provide sealing with enclosure.
Not more than one single or multiple strand wiring lead shall be connected into either side of the terminals.
Leads connected to the terminals shall be insulated for the appropriate voltage and this insulation shall extend to within 1 mm of the metal of the terminal throat.
The maximum permitted current of the non-IS alarm contacts is 3 A.
The earth pillar adjacent to the RTD connectors must be used only for RTD cable screens.
The external RTDs must be capable of withstanding a 500 V test to earth.

Certification

nVent certifies that this product met its published specifications at the time of shipment from the factory.

Warranty

This nVent product is warranted against defects in material and workmanship for a period of 12 months from the date of installation or 30 months maximum from the date of shipment, whichever occurs first. During the warranty period, nVent will, at its option, either repair or replace products that prove to be defective. For warranty service or repair, this product must be returned to a service facility designated by nVent. The Buyer shall prepay shipping charges to nVent and nVent shall pay shipping charges to return the product to the Buyer. However, the Buyer shall pay all shipping charges, duties, and taxes for products returned to nVent from another country. nVent warrants that the software and firmware designated by nVent for use with a product will execute its programming instructions properly when installed on that product. nVent does not warrant that the operation of the hardware, or software, or firmware will be uninterrupted or error-free.

Limitation of warranty

The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by the Buyer, Buyer-supplied software or interfacing, unauthorized modification or misuse, operation outside of the specifications for the product, or improper installation.
NO OTHER WARRANTY IS EXPRESSED OR IMPLIED. NVENT DISCLAIMS THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

Exclusive remedies

THE REMEDIES PROVIDED HEREIN ARE THE BUYER’S SOLE AND EXCLUSIVE REMEDIES. NVENT SHALL NOT BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WHETHER BASED ON CONTRACT, TORT, OR ANY OTHER LEGAL THEORY.

Statement of compliance

This equipment has been tested and found to comply with the low voltage directive 2014/35/EU, the ATEX directive 2014/34/EU and the electromagnetic compatibility directive 2014/30/EU. These limits are defined to provide reasonable protection against harmful interference in a residential installation (technical data mentions industrial application). This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

Reorientate or relocate the receiving antenna.
Increase the separation between the equipment and receiver.
Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
Consult the dealer or an experienced radio/TV technician for help.

Area of use

nVent RAYCHEM 5010i-(LIM) controllers are used for temperature control and temperature limiting of electrical heaters in industrial and potentially explosive atmospheres. The Elexant 5010i-(LIM) consists of a temperature controller and an additional safety temperature limiter. Elexant 5010i-(LIM) units are approved for use in hazardous area Zone 1 and Zone 2 (Gas) and Zone 21 and Zone 22 (Dust). Where needed, the temperature sensor of the unit can be placed in Zone 0 (Zone 20) However, the control unit itself is not approved for being installed in Zone 0 (Zone 20).

Safety instructions

During operation, do not leave this Installation Manual or other objects inside the enclosure. Use the temperature controller and limiter only for its intended purpose and operate it only in clean, undamaged condition. In the event of incorrect assembly, the requirements of IP66 as specified by IEC 60529:2001 are no longer met. Do not make any modifications to the temperature controller and limiter that are not expressly mentioned in this Installation Manual. Whenever work is done on the temperature controller and limiter, be sure to observe the national safety and accident prevention regulations and the safety instructions given in this Installation Manual.

Technical data

nVent-RAYCHEM-Elexant-5010i,-5010i-LIM-Field-Controller-
FIG-4

Communications| |
---|---|---
Physical network| RS-485 and Class 1 Bluetooth|
Protocol / topology| Modbus RTU or ASCII. Multi drop/Daisy Chain
Cable and maximum length| Shielded twisted pair cable, 0.5 mm² (AWG 24) or larger. Total cable length from first till last device shall not be more than 1200 m.
Maximum quantity of controllers in one network| Max. 247 devices per field communication network
(Modbus) Network address| Software configurable via nVent RAYCHEM Android tablet application
Configuration and setting| |
Method| Through handheld programming device or via nVent

RAYCHEM Supervisor software/User Interface (TOUCH 1500, NGC-UIT)

Elegant 5010 i accessories

| |
Temperature sensors| |

Product name

| MONI-PT100-260/2 MONI-PT100-EXE

MONI-PT100-EXE-SENSOR

|
Support bracket for installation on pipe
Product name| SB-125|
Bluetooth enabled handheld programming device with customized software
See for more information Android tablet TAB-Ex datasheet and Elexant Connect operations manual

INSTALLATION

For installation/operation, always observe the Equipment Safety Law, the rules of generally accepted engineering practice
(IEC60079-14/EN 60079-14), and the instructions stated in this Manual. Carry out work on the thermostats in the de-energized state only.
Mechanical installation
Elexant 5010i-LIM units comprise a temperature controller and a safety temperature limiter installed in one enclosure. The controllers can be installed in any position on a stable structure by means of the 4 mounting holes. Up to a pipe temperature of 210°C the
Elexant 5010i and Elexant 5010i-LIM units can be mounted directly on the pipe by means of a support bracket type SB-125. Ensure that the ambient temperature of the equipment does not exceed 60°C at any time. In order to provide enough stability, the support bracket shall be attached by means of 2 pipe straps . nVent-RAYCHEM-Elexant-5010i,-5010i-LIM-Field-Controller-
FIG-5

Connecting cables and cable glands to Elexant 5010i and Elexant 5010i-LIM units.
Installation instructions for glands (threaded holes only)
At ambient temperatures > 45 °C the selected cable should have a temperature rating of 80°C or higher. Cable glands with a temperature rating of 80°C or higher should be selected.

Tolerance class	Tolerance class for Ex e glands is maximum 6G/6H.

Enclosure material limitations

| When plastic glands are used, only plastic glands made from flame retardant, high impact resistant polyamide shall be used. The glands shall be suitably certified for the intended area of use.
Maximum surface roughness of the enclosure wall| Better than 3,2µm is recommended.

Maximum level of surface roughness allowed is Ra 6µm;

Enclosure interface sealing method| If the sealing surfaces are uneven, use PTFE washer NFWM25 Or the green fiber washer GFWM25 (Washers are to be ordered separately).
---|---
Thickness range for the enclosure wall (t)| ≥ 4 mm
Perpendicularity| +/–1° or 0.2 mm at the outer edge of the gland, whichever is smaller.

Permitted use and location of any earth tags

| For metal glands use an internal lock not to assure earth continuity via the Elexant 5010i/Elexant 5010i-LIM internal earth plate. Alternatively, earth tags connected to one of the internal PE terminals can be used.
For chamfered holes| Only parallel threads are allowed.
Lock nuts| Only use nVent RAYCHEM locknuts or types recommended by the gland manufacturer.
Recommended torque values| The installation instructions provided by the gland manufacturers must be followed.

Grounding and bonding (earthing)
Elexant 5010i/Elexant 5010i-LIM units must be earthed in accordance with the local wiring regulations. The Elexant 5010i/Elexant 5010i-LIM earthing system is providing internal and external earth connection facilities. All internal and external parts of the Elexant 5010i/ Elexant 5010i-LIM earthing system are interconnected inside the encapsulant. When using the external earth stud the following requirements apply for connection.

M6 threaded earth stud (Greased, 1 pc)
Serrated washer (1 pc)
Washer (3 pc)
M6 threaded nut (Tightening Torque 4,5 Nm) (2 pc)
Seal Nyltite-Siegel (1 pc)

Temperature sensors

The Elexant 5010i/Elexant 5010i-LIM temperature inputs are designed as intrinsically safe circuits (IEC 60079-11/EN60079-11 Ex [ib]) therefore any type of three wire DIN IEC 751 Class B PT100 resistance temperature devices can be used. The Elexant 5010i-LIM supports 3 local temperature inputs, where 2 are allocated to the temperature controller (RTD 1 and RTD 2). The third temperature input is reserved for the temperature limiter (RTD limiter). Elexant 5010i units on the other hand do not support the third input (RTD limiter).

Lead compensation of RTD connections

Elexant 5010i and Elexant 5010i-LIM units can provide up to 20 Ohm lead resistance compensation. This implies that sensor connections may be extended using a three-core shielded or braided cable with a maximum length of up to 150 meters.
(max. 3 x 1.5 mm²) The screen or braid of the extension cable is to be grounded at the controllers end only.

Installation of temperature sensors

The temperature sensors must be installed in such a way that the sensor(s) measure(s) the surface temperature as reliably as possible. Therefore, the guidelines as described in section 2.3.2.1 need to be followed.

The temperature sensor of the temperature controller

Important guidelines on sensor positioning and installation:
The correct position is on top of the pipe. (Figure 7)
The sensor needs to be attached with sufficient glass tape (GT-66 or GS-54).
Use two bands of glass tape to ensure its position. (Figure 7)
The lead wire needs to leave the insulation so that no moisture can enter the cladding-insulation system. (Figure 8)
Fix the sensor lead wire to prevent accidental strain on the sensor tip, which could alter its position.

Warning:

Do not install sensor at ambient temperatures below –20°C. Do not bend sensor (last 50 mm), keep it straight under all circumstances.
To prevent damage to the sensor, no metal straps may be used, the use of fiberglass self-sticking tapes is recommended.

Limiter temperature sensor on the pipe surface

The first method consists of using the surface temperature of the pipe as reference and preventing powering the heating cable when the pipe temperature is above a calculated value. This value is dependent on the make of the cable and the design of the heating circuit. Use TraceCalc Pro to determine this value and document the calculation in your filing.
The sensor is installed identical to the normal temperature sensor, at the top of the pipe, firmly attached to the surface by means of glass tape. Special attention needs to be taken that the sensor lead does not cool the pipe/sensor; nor that moisture could enter the insulation, cooling the sensor tip or reducing the insulation capacity in this area.

Limiter temperature sensor on an artificial HOT-SPOT

The second way of surface temperature limiting is to create an artificial hot spot. In order to guarantee the limiter sensor measures the highest possible temperature of the installation, the temperature sensor of the limiter shall be installed on an artificial hotspot.

Important guidelines on sensor positioning and installation:

The correct position is on top of the pipe. See Figure 9.
Fix the insulation pad with sufficient glass tape. (GT-66 or GS-54)
Guide the heater from the bottom of the pipe to the insulation pad and fix it well so that it keeps its position.
The sensor needs to be attached with sufficient glass tape to the heater. Use two bands of glass tape to ensure its position.
The lead wire needs to leave the insulation so that no moisture can enter the cladding-insulation system. Fix the lead wire to the pipe with glass tape if needed to ensure the stability of the hot spot system.
Make sure that the nominal insulation thickness is respected over the hot spot, it might be necessary to use oversized insulation shells.

Limiter temperature setting

The limiter value (Tlim) needs to be set at the maximum allowed surface temperature (Tmax) minus 10 K when Tmax > 200°C.
The limiter value (Tlim) needs to be set at the maximum allowed surface temperature (Tmax) minus 5 K when Tmax < 200°C.

Electrical installation

See page 3 for electrical connection diagram of the Elexant 5010i controller. The limiter temperature sensor connection is only applicable with the Elexant 5010i-LIM. The optional second PT100 temperature sensor for the control unit is omitted for clarity.

Communication and networking

The Elexant 5010i controller is equipped with a RS-485 interface. Through this interface up to 247 Elexant 5010i units can be networked to a NGC-UIT/TOUCH 1500 or to one serial port of standard PC running Windows based Supervisor software.
Sensor PipeLead entranceNoNo

Configuration

The Elexant 5010i controllers can be configured locally by means of a handheld programming device or from a central location using the NGC-UIT/TOUCH 1500 or Supervisor Software. After programming, all settings are permanently stored in the nonvolatile memory of the Elexant 5010i control unit, avoiding loss of data in the event of power failure or after a long-term power shutdown.

MAINTENANCE

Equipment placed into hazardous areas needs to comply with IEC/EN 60079-17 regarding inspection and maintenance requirements. The IEC/EN 60079-17 describes in more detail the requirements regarding documentation, qualifications of personnel, inspections, regular periodic inspections, continuous supervision by skilled persons, maintenance, isolation of apparatus, earthing and inspection schedules.

SAFETY TEMPERATURE LIMITER

Safety limiter

The safety limiter option (-LIM option of the Elexant 5010i, see Table 1 – Elexant 5010i Variants) provides a redundant high temperature cut-out mechanism, suitable for use in safety critical applications. It disconnects power from the heater, preventing the system from exceeding a safe temperature level.

Safety function of the limiter in the Elexant 5010i-LIM

The safety function is invoked when the temperature limit is reached, or in the event of a fault (such as sensor break, sensor short-circuit, component failure, or supply failure) even when the process conditions are within the permissible temperature range. The safety function disconnects power to the attached equipment without delay.
Power may be restored to the attached equipment by manually resetting the safety function after the temperature returns below the permissible limit, and no fault is present. The safety function may be reset using the RESET button on the front of the unit, or through supervisory software connected via the communication ports or via handheld android device over Bluetooth.
In specific circumstances where there is no current flowing through the heat trace during the over-temperature event, the limiter will self-reset once the temperature returns below the permissible limit and no fault is present.

Area of use

Safety limiters are used in areas where thermal processes need to be prevented from overheating, and where the system must be set to a safe operating condition in the event of a fault. A typical example of such an installation is surface heating in a hazardous area.

Resetting the safety limiter

The safety limiter is designed such that after it has tripped, resetting it is possible only after the normal, safe operating conditions are returned. If there was no current flowing through the heat trace at the time of the over-temperature condition, the safety limiter will reset itself without user intervention. If there was current present in the heat trace during the over-temperature condition, then the device needs to be manually reset.
In order to manually reset the limiter after it has tripped, the user needs to press the RESET button, under the lid of the Elexant 5010i enclosure (shown in the Figure below). Alternatively, the limiter can be reset remotely using Supervisor software, Android tablet, or other supervisory software. Refer to the operating manual for the supervisory software for detailed instructions on how to remotely reset a safety limiter.

Setting the limiter temperature set point

Choosing a set point

The lock out temperature (set point) of the safety limiter must be set in such a way that the maximum allowable temperature of the equipment is not exceeded. For example, the surface temperature of a heat-tracing cable in a hazardous area cannot exceed the local maximum temperature allowed based on the classification rating (T-rating) of the area. The set point should be the maximum allowed temperature less 5°K for temperatures below or 200°C, or less 10°K for temperatures greater than 200°C.

Configuring the limiter set point

Modifying the set point requires physical access to the Elexant 5010i device. The lock out set point may be configured with any supervisory software that allows the user to be physically close to the 5010i device. The procedure to modify the limiter set point is the same for all user interfaces. Use your preferred configuration method to enter the set point and then press the SET button on the Elexant 5010i device to confirm the set point change.
The SET button can be accessed by unscrewing and removing the top cover. The button must be pressed within 30 seconds after the new setpoint has been entered. If the button is not pressed before this time interval has elapsed, the new value is discarded and the old set point value remains unchanged. Once the new set point has been saved, it can be confirmed by holding the SET button, and reading the setpoint (in °C) off the LED display.

Main output interlock

When the safety limiter output is off, for any reason, an internal signal overrides the output of the main output switch, to force it off. The main output can only be switched on if the limiter temperature sensor is connected, and the measured temperature is below the limiter set point. There is no user action required for this feature, and it cannot be disabled.

Internal diagnostic

The internal power to the limiter circuit is continually monitored by the limiter microprocessor. Any detected instability is reported to the user via a status flag on the user interfaces. There is no known effect on the safety function in the presence of a detected power failure. As a precaution, if the limiter power failure flag is persistent or recurring regularly, follow the instructions in Section 3.1.13– Response to Fault Conditions.

Functional test

The Elexant 5010i Safety Limiter units meet the requirements of SIL2 (see Section 3.1.11 PFDavg Safety Function for more details) as set out in IEC61508:2010. In accordance with this standard, units are subjected to a functional test after commissioning and at regular intervals, in order to guarantee safe and reliable operation. The test interval for the safety limiter can be set to 1, 10 or 20 years, depending on the application. The functional test procedure is described in Section 3.1.8 – Functional Test Procedure. Conformance to the SIL certification is limited to the 20-year lifetime of the unit.

Type| Safety Integrity Level| Systematic Capability| Proof Check Interval| Unit Lifetime
---|---|---|---|---
5010i-Mod-IS-LIM| SIL 2| SC 2| 1, 10, or 20 years| 20 years

Table 2 – Functional Test
Functional test procedure
The functional test is performed after commissioning and at regular intervals over its operational lifetime, to ensure it is still capable of carrying out its intended safety function. This check requires a voltmeter capable of reading the output heater voltage, and a short length of wire (5 cm/2 in).
Setup the functional test using these steps:

Reset any limiter-related trips.
Clear all alarms.
Ensure the controller output (and the HEATER LED) are on. The Control Mode can be switched to “Force ON” if required.
Setup check: Measure the voltage to the heater at the output terminals Lo and No, to verify the output is ON.

Execute the functional test by performing the following steps:

Disconnect one of the limiter RTD leads (sensors).
Result: The ALARM and LIMITER LEDs light up, and the HEATER LED switches off.
Check for OFF: Measure the voltage to the heater at the output terminals Lo and No, to verify the output is off.
Reconnect the limiter RTD (sensor). Wait about 10 seconds for the temperature reading to return on local display.
Press the RESET button.
Clear all alarms.
The HEATER LED is now on, the ALARM and LIMITER LEDs are off.
Check for ON: Measure the voltage to the heater at the output terminal, to verify the output is on.
Install a wire bridge between the W/B and rightmost R positions to simulate a short across the limiter RTD (sensor). Wait about 10 seconds for the short to be detected.
Result: The ALARM and LIMITER LEDs light up and the HEATER LED switches off.
Check for OFF: Measure the voltage to the heater at output terminals Lo and No, to verify the output is off.
Remove the wire bridge. Wait for 10 seconds for the temperature reading to return.
Press the RESET button.
Clear the alarms.
The HEATER LED is now on, and the ALARM and LIMITER LEDs are off.
Check for ON: Measure the voltage to the heater at output terminals Lo and No, to verify the output is on.

Clean up steps:

Return the control algorithm to its previous setting if it was changed to force the output on.

Test in the event of a fault
In the event of a system fault, the device is designed to fail safe whenever possible. If the limiter output does not close, even after pressing the RESET button, check the Status of the Safety Limiter, and any active alarms in the supervisory software. If no issues are indicated in these locations, or the error cannot be resolved by the installer, the unit may need to be replaced. See last page of installation manual for contact information.
Determining safety integrity of the Elexant 5010i-LIM
The Elexant 5010i-LIM is a Type B system, as defined in IEC61508-2:2010. A sub-system is a Type B system when all of the following apply:

The failure mode of at least one component that is used is not adequately defined.
The response of the sub-system in fault conditions cannot be completely determined.
No adequately reliable failure data, based on field experience is available for the subsystem, to support the assumed failure rates for recognized and unrecognized hazardous failures.

The Elexant 5010i Limiter variant meets the requirements for Systematic Capability (SC) 2. The following table presents the achievable Safety Integrity Level (SIL), depending on the Safe Failure Fraction (SFF) and the Hardware Fault Tolerance (HFT) for Type B safety-related subsystems. The table below is valid for the Elexant 5010i-LIM:

SFF of an element| Hardware Fault Tolerance|
---|---|---
| 0| 1| 2
< 60%| Not Allowed| SIL 1| SIL 2
60% – 90%| SIL 1| SIL 2| SIL 3
90% – 99%| SIL 2| SIL 3| SIL 3
≥ 99%| SIL 3| SIL 3| SIL 3

Table 3 – Maximum SIL for Type B with SC 2
The Elexant 5010i-LIM is at HFT of 0, SIL2 (90% – 99%) for Type B safety- related subsystems.
PFDavg safety function
The limiter temperature sensor and limiter electronics together form the safety related system that performs the safety function. The “average probability of the hazardous failure of a safety function for the entire safety related system” (PFDavg) is divided among the subsystems. An external device such as the temperature sensor, is specific to the installation, and shall in accordance with the standards for the safety loop, be considered separately. nVent-RAYCHEM-Elexant-5010i,-5010i-LIM-Field-Controller-
FIG-11

Table 4 – Safety Integrity Level

SIL = Safety Integrity Level
MTTR = Mean Time to Repair
HFT = Hardware Fault Tolerance
SFF = Safe Failure Fraction
1oo1 = One out of One
PFD = Probability of Failure on Demand

System failure modes
When using the Elexant 5010i Limiter variant in a safety-critical application, it is necessary to consider the failure mode of all elements, and the probabilities of those failures, in order to understand their possible effect, and what mitigation may be necessary. The table below summarizes the failure modes of this element. nVent-RAYCHEM-Elexant-5010i,-5010i-LIM-Field-
Controller-FIG-12

Table 5 – Failure Modes
Response to fault conditions
In case a failure of the safety system is detected, either during operation or during routine maintenance when executing a function test, the unit should be switched off and taken out of service. Defects in the safety system cannot be repaired in the field. Defective units are to be replaced and returned to the manufacturer for investigation. Please contact your nearest nVent representative for more instructions. Information about the unit, including the device serial number, and limiter firmware version, may be requested by the nVent representative. This information is available via the supervisory software. A list of worldwide representatives can be found on www.nVent.com/RAYCHEM

Europe, Middle East, Africa
Tel +32.16.213.511
Fax +32.16.213.604
thermal.info@nVent.com
Asia Pacific
Tel +86.21.2412.1688
Fax +86.21.5426.3167
cn.thermal.info@nVent.com
©2023 nVent. All nVent marks and logos are owned or licensed by nVent Services GmbH or its affiliates. All other trademarks are the property of their respective owners. nVent reserves the right to change specifications without notice. RAYCHEM-IM-EU1917-Elexant5010i-ML-2305