What Are Instrumentation Cables?

In industrial automation, process control, and measurement systems, the reliable transmission of signals is critical. One of the key components ensuring this reliability is instrumentation cables. These specialized cables are designed to transmit low-voltage analog and digital signals from devices that measure physical parameters—such as temperature, pressure, flow, and level—to control systems without distortion or interference.

Instrumentation cables are manufactured with screened structures to provide high resistance against electromagnetic interference (EMI). In industrial environments, where motors, inverters, and power cables often create noise and signal distortion, instrumentation cables ensure signal integrity.

Common configurations include RE-2X(St)H, RE-2X(St)YSWAY, and RE-2X(St)HSWAH-PiMF/TiMF. These designations define characteristics such as insulation type, screen construction, outer sheath material, armor type, and fire resistance rating. For example, RE-2X(St)YSWAY includes steel wire armor (SWA), providing mechanical protection alongside EMI shielding.

Where Are Instrumentation Cables Used?

Instrumentation cables are essential in any sector that requires precise and reliable signal transmission. The most common applications include petrochemical plants, refineries, natural gas terminals, power generation facilities, cement factories, mining operations, water treatment plants, and tunnel infrastructures.

Petrochemical and refinery facilities present harsh environments with high temperatures, EMI, and exposure to chemical vapors. Here, steel wire armored (SWA) or steel wire braided (SWB) instrumentation cables ensure signal continuity and mechanical protection.

In tunnel infrastructure and metro systems, long-distance signal transmission without loss is crucial. Double-screened, halogen-free cables are often preferred, providing fire safety by reducing smoke and toxic gas emissions during fire incidents.

In the mining industry, cables are exposed to extreme mechanical loads and potentially explosive environments. Steel wire armored cables offer critical resistance to crushing, impact, and environmental stress, making them ideal for these conditions.

Power plants and energy infrastructure require instrumentation cables that are not only EMI-resistant but also flame retardant. Models like RE-2X(St)HSWAH-PiMF/TiMF—with individual pair shielding—are particularly suitable for these high-demand applications.

Key Considerations When Selecting Instrumentation Cables

Choosing the right instrumentation cable involves much more than price and delivery time. Long-term performance, compliance with standards, and environmental suitability are all key to making the right decision.

1. Screening Type (St / PiMF / TiMF)

The screen plays a key role in protecting signals from interference. While overall screens (St) offer general EMI shielding, PiMF (Pair in Metal Foil) and TiMF (Triad in Metal Foil) constructions shield each pair or triad individually, ideal for high-precision and noise-sensitive environments.

2. Armoring (SWA / SWB / Steel Wire Armor)

In applications with mechanical stress—such as underground or outdoor installations—steel wire armor (SWA) or steel wire braiding (SWB) is critical for long-lasting protection against impact, pressure, and rodent damage.

3. Outer Sheath Material

Environmental conditions determine sheath selection. PVC may suffice for indoor use, while UV-resistant PE is preferred outdoors. For areas requiring fire safety, halogen-free (LSZH or HFFR) sheaths are mandatory.

4. Fire Performance (LSZH, Flame Retardant)

In enclosed areas like tunnels, mines, and public buildings, excessive smoke and toxic gas pose severe risks. Therefore, flame retardant, halogen-free instrumentation cables are essential for ensuring safe evacuation and limiting fire damage.

5. Standards and Certifications

Instrumentation cables should comply with international standards such as EN 50288-7, IEC 60332, and VDE. Certification ensures consistent performance and regulatory compliance.

6. Core Construction (Pair / Triad / Multi-pair)

Depending on signal requirements, cables may be structured in 1x2x0.75 mm², 2x2x1.5 mm², or similar configurations. Proper shielding becomes increasingly important in multi-pair designs.

The Importance of Halogen-Free Instrumentation Cables

Halogen-free instrumentation cables are crucial in environments where fire safety and human health are priorities. LSZH (Low Smoke Zero Halogen) cables release minimal smoke and no toxic halogens during combustion, helping to prevent harm during fires.

These cables are now a standard in tunnels, hospitals, public buildings, and underground systems, where fast evacuation is critical. Halogen-free instrumentation cables not only reduce the spread of toxic smoke but also protect equipment by minimizing corrosive gas damage—facilitating quicker recovery and system restart after a fire.

At ETK Kablo, we offer halogen-free outer sheath options across our entire instrumentation cable range, combining technical safety with environmental responsibility.

ETK Kablo’s Instrumentation Cable Solutions

ETK Kablo is one of Turkey’s leading manufacturers in the instrumentation cable segment. Our products, engineered to the highest technical standards, are trusted in demanding industrial environments and exported to many countries worldwide.

The RE-2X(St)H series is an ideal, cost-effective solution for general industrial applications. RE-2X(St)YSWAY features steel wire armor, offering excellent mechanical protection in underground and outdoor installations. For high-EMI environments like petrochemical plants and power stations, the RE-2X(St)HSWAH–PiMF/TiMF model offers both individual pair shielding and steel wire armor, ensuring optimal signal integrity and mechanical resilience.

All ETK Kablo instrumentation cables comply with:

• IEC 60332-1 / IEC 60332-3 flame retardancy standards
• EN 50288-7 structural and performance specifications
• VDE-certified quality control and production processes

We also provide project-specific customizations such as conductor size, outer sheath color, length, and screening configuration.
Instrumentation cables are critical to the reliability of control systems in industrial automation and process management. Choosing the correct cable ensures signal accuracy, system stability, fire safety, and long-term durability.

Solutions that feature SWA or SWB armor, halogen-free sheaths, individual pair shielding, and standardized designs such as RE-2X(St)H and RE-2X(St)YSWAY, provide both technical and regulatory advantages.

ETK Kablo meets the demands of the most challenging industries with its wide product range, engineering support, and proven quality. From tunnels to petrochemical facilities, from mining to energy, we deliver safe, durable, and efficient instrumentation cable solutions for every application.