کابل هیت تریس خودتنظیم‌شونده ال ترم ELSR-M

ELTHERM ELSR-M Self-Regulating Heating Cable

Manufacturer: eltherm GmbH, Germany

Compact Self-Regulating Heating Cable for Freeze Protection and Temperature Maintenance

1. Product Overview

The ELTHERM ELSR-M self-regulating heating cable is a low-temperature electric heat tracing solution manufactured by eltherm GmbH, Germany. Designed for applications where installation space is limited, this highly flexible heating cable features compact dimensions and is particularly suitable for short heating circuits.

The ELSR-M is designed for freeze protection and temperature maintenance up to 65°C, making it suitable for a wide range of industrial heat tracing applications. Its self-regulating technology adjusts the local heat output in response to temperature changes, helping provide heat where it is needed along the heated surface.

With its compact construction, moisture resistance, UV resistance, and flexible installation characteristics, the ELSR-M is a practical option for heating pipelines, valves, pumps, and selected industrial process systems.

Available in AO and BO versions, the ELSR-M can be selected according to the installation requirements and the electrical protection arrangement of the application. The appropriate cable version, rated output, accessories, and circuit configuration should be determined using the manufacturer's technical documentation.

2. Applications of the ELSR-M Heating Cable

The ELTHERM ELSR-M is designed for low-temperature heat tracing applications, particularly where compact dimensions and short heating circuits are required.

Freeze Protection

The ELSR-M can be used to help prevent the freezing of liquids in pipelines and equipment exposed to low ambient temperatures. Correct heat-loss calculations and suitable thermal insulation are essential to ensure reliable freeze protection.

Temperature Maintenance

The cable can provide supplementary heat to maintain the required temperature of compatible pipelines and process equipment, helping compensate for heat losses to the surrounding environment.

Pipelines and Process Lines

Its compact dimensions and flexible construction make the ELSR-M suitable for selected pipe heat tracing installations where space is restricted and the required heating circuit length is appropriate.

Valves and Pumps

The cable can be considered for freeze protection and temperature maintenance around suitable valves, pumps, and associated components, subject to the manufacturer's installation instructions.

Chemical and Petrochemical Industries

The ELSR-M may be used in suitable industrial heat tracing applications in chemical and petrochemical facilities. Material compatibility, process temperatures, environmental conditions, and any hazardous-area requirements must be evaluated before selection.

Food Processing Industry

The cable can be considered for compatible food-processing installations requiring low-temperature heat tracing, provided that the process requirements, installation conditions, and applicable hygiene standards are satisfied.

3. Key Features and Technical Benefits

Self-Regulating Heating Technology

The heating output changes in response to local temperature variations. As the temperature rises, the heating output decreases; as the temperature falls, the output increases. This characteristic helps the cable adapt its heat generation to changing thermal conditions.

Compact Dimensions

The ELSR-M is designed for applications where installation space must be kept to a minimum. Its compact profile makes it suitable for selected installations around pipelines and industrial equipment.

High Flexibility

The flexible construction facilitates routing and installation in suitable applications. The minimum bending radius is 25 mm and must be observed during installation.

UV Resistance

The cable is UV-resistant, making it suitable for applications where exposure to ultraviolet radiation is a relevant environmental consideration, within the manufacturer's specified operating conditions.

Moisture Resistance

The ELSR-M is designed to resist moisture under the specified application conditions. Suitable connection kits, junction boxes, cable entries, and sealing arrangements must be selected for the actual installation environment.

Two Nominal Outputs

The ELSR-M is available in two nominal heating output ratings. The appropriate rating should be selected based on the required heat output, pipe temperature, insulation design, ambient conditions, and the manufacturer's output curves.

Suitable for Short Heating Circuits

The cable is particularly suited to short heating circuits and installations where compact dimensions and flexible routing are important design considerations.

4. Cable Construction

The ELTHERM ELSR-M is manufactured using a layered construction designed to provide electrical heating, insulation, and environmental protection.

1. Supply Bus Wires

The supply conductors are made of nickel-plated copper and distribute electrical power to the self-regulating heating element.

2. Self-Regulating Heating Element

The heating element changes its electrical resistance in response to temperature variations, allowing the local heating output to adjust according to thermal conditions.

3. Electrical Insulation

The insulation separates the internal electrical components and provides the required electrical insulation within the cable construction.

4. Protective Layer

The protective arrangement depends on the selected cable version:

• BO version: Features a protective braid made of tin-plated copper.
• AO version: Uses a protective conductor arrangement with tin-plated copper and aluminium foil, as specified in the manufacturer's product documentation.

The protective arrangement and earthing requirements must be verified for the exact cable version being installed.

5. Outer Jacket

The outer jacket is made of TPE-O and provides external protection under the specified application conditions.

The complete cable configuration, protective conductor connection, and compatible accessories should always be checked against the official ELSR-M datasheet and installation manual.

5. Technical Specifications

The following table summarizes the principal technical specifications published for the ELTHERM ELSR-M family.

6. How Does the Self-Regulating Heating Cable Work?

The ELTHERM ELSR-M uses self-regulating heating technology to adjust its heat output in response to temperature changes.

The heating element is designed so that its electrical resistance increases as its temperature rises, reducing the local heating output. When the temperature decreases, the resistance decreases and the heating output increases.

This operating principle allows different sections of the cable to produce different amounts of heat according to their local thermal conditions. It is particularly useful in applications where temperature and heat-loss conditions vary along a pipeline or around connected equipment.

Self-regulating operation helps the cable respond to changing thermal requirements. However, it does not eliminate the need for correct heat-loss calculations, electrical protection, appropriate circuit design, and compliance with the manufacturer's installation instructions.

7. Installation and System Design Considerations

Correct system design is essential to achieve reliable heat tracing performance and safe operation.

Heat-Loss Calculation

Calculate the heat loss of the pipeline or equipment based on pipe diameter, pipe material, insulation thickness, ambient temperature, required maintenance temperature, and installation conditions.

Selection of Heating Output

Choose the appropriate ELSR-M output rating according to the calculated heat demand and the manufacturer's power-output curves.

Heating Circuit Length

Determine the permissible heating circuit length using the official manufacturer's tables. The maximum length depends on factors such as start-up temperature, circuit-breaker rating, supply voltage, and installation conditions.

Electrical Protection

Select suitable circuit breakers and residual-current protection in accordance with the applicable electrical regulations and the manufacturer's requirements. Protective earthing must be implemented according to the selected cable version and approved installation arrangement.

Bending Radius and Installation Temperature

The minimum bending radius is 25 mm, and the minimum installation temperature is -45°C. Both limits must be observed during installation.

Thermal Insulation

Install suitable thermal insulation after the heating cable has been positioned and inspected. The insulation system should be designed to minimize heat loss and maintain the required process temperature.

Compatible Connection Components

Use connection kits, end termination kits, junction boxes, cable entries, and other accessories compatible with the selected ELSR-M version and the actual environmental conditions.

Inspection Before Commissioning

Before energizing the system, inspect the cable, connections, protective arrangements, and insulation. Perform the electrical tests required by the manufacturer's installation manual and applicable standards.

8. Compatible Accessories

ELTHERM lists the following connection and termination kits and junction boxes as compatible accessories for the ELSR-M product family.

Connection and Termination Kits

• ELVB-SRAM-25: Connection kit for suitable ELSR-M installations.
• ELVB-SRV-M: Connection set for compatible cable configurations.

Junction Boxes

• ELAK-2
• ELAK-5
• ELAK-5.1
• ELAK-5.7
• ELAK-R7
• ELAK-RS
• ELAK-RS-T

The suitability of each accessory depends on the selected cable version, electrical configuration, installation environment, and applicable protection requirements. Confirm compatibility using the manufacturer's accessory documentation before ordering.

A complete heat tracing system may also require suitable pipe-mounting materials, thermal insulation, electrical protection devices, and temperature monitoring or control equipment, depending on the project design.

9. AO and BO Versions

The ELTHERM ELSR-M is available in two versions: AO and BO.

The versions differ in their protective construction and protective conductor arrangement. The BO version features a tin-plated copper protective braid, while the AO version uses the protective arrangement described in the manufacturer's technical documentation, including aluminium foil and a tin-plated copper protective conductor.

The appropriate version should be selected according to the installation requirements, electrical protection design, and applicable regulations. The manufacturer's documentation must be consulted to verify the exact construction and connection requirements.

10. Safety and Maintenance

Installation and electrical connection should be performed by qualified personnel in accordance with the manufacturer's instructions and applicable electrical regulations.

Before commissioning, verify the cable condition, connection integrity, protective earthing, insulation, and electrical protection devices. Periodic inspections should be carried out according to the installation environment and the maintenance requirements of the system.

If the cable jacket, connections, or accessories become damaged, the system should be assessed by qualified personnel before further operation. Repairs and replacements must follow approved procedures.

The ELSR-M's self-regulating characteristic does not replace appropriate electrical protection or correct system design. The specified temperature limits, circuit lengths, and installation conditions must always be respected.

11. Why Choose the ELTHERM ELSR-M?

The ELTHERM ELSR-M is a compact and flexible self-regulating heating cable designed for low-temperature industrial heat tracing applications.

Its principal advantages include:

• Self-regulating heat output that responds to local temperature changes.
• Compact dimensions for installations with limited space.
• High flexibility for suitable installation routes.
• UV resistance and moisture resistance.
• Two nominal heating output ratings.
• Suitability for short heating circuits.
• Application in freeze protection and temperature maintenance up to 65°C.

These characteristics make the ELSR-M a practical option for selected pipeline, valve, pump, and industrial process heating applications where the required operating conditions fall within the cable's specifications.

12. Conclusion

The ELTHERM ELSR-M self-regulating heating cable is designed to provide reliable electric heat tracing for freeze protection and temperature maintenance up to 65°C. Manufactured by eltherm GmbH in Germany, it combines a compact design, flexible construction, self-regulating heating technology, and resistance to UV radiation and moisture.

With a nominal voltage of 230 V, a minimum bending radius of 25 mm, and a minimum installation temperature of -45°C, the ELSR-M is particularly suitable for short heating circuits and installations where space is limited.

For a successful heat tracing installation, the cable output, circuit length, thermal insulation, electrical protection, accessories, and environmental conditions must be evaluated carefully.