Veriflex Profibus PA LSZH Cable

What is Veriflex Profibus PA LSZH Cable?

The Veriflex Profibus PA LSZH Cable is a low-voltage, double-shielded industrial communication bus cable rated at a maximum operating voltage of 300V, engineered according to IEC 61158 standards for process automation systems. It connects field-level transmitters, intelligent flowmeters, positioners, and actuators directly to central control systems in hazardous processing zones and chemical plants.

Unlike Profibus DP networks designed for cyclic factory automation speeds, Profibus PA adheres to Manchester-encoded, bus-powered (MBP) physical transmission operating at 31.25 kHz, providing intrinsic safety for classified explosive atmospheres. The cable incorporates an 18/1 AWG solid bare copper conductor with solid Polyethylene (PE) dielectric insulation, protected by a dual screening system consisting of an Al/PET foil tape and a 60% tinned copper wire braid (TCWB). The halogen-free flame-retardant (LSZH) outer jacket prevents toxic halogen acid gas emissions and thick smoke in thermal events, protecting operations personnel and delicate electronics in enclosed control facilities.

Veriflex Profibus PA LSZH Cable Construction

• Conductor: Solid plain annealed bare copper wire, 18/1 AWG (nominal cross-sectional area 0.85 mm², nominal conductor diameter 1.04 mm).
• Insulation: Solid Polyethylene (Solid PE) compound extruded to a nominal diameter of 2.5 mm, providing stable dielectric performance.
• Bedding / Binding: Polyester tape (PET) applied helically over the insulated pair.
• Filler: Extruded Low Smoke Zero Halogen (LSZH) filler compound achieving a nominal diameter of 5.5 mm to ensure roundness.
• Primary Screen: Aluminium/Polyester tape (Al/PET) offering 100% electrostatic coverage against high-frequency electromagnetic noise.
• Secondary Screen: Tinned Copper Wire Braid (TCWB) with 60% coverage, providing low transfer impedance (15 mΩ/m at 100 kHz) and structural protection.
• Outer Sheath: Thermoplastic Low Smoke Zero Halogen (LSZH) compound, flame retardant per BS EN/IEC 60332-1-2.
• Core Identification: 1 Pair: Green and Red cores.
• Sheath Colour: Intrinsically Safe Blue.

Applications

Veriflex Profibus PA LSZH cables are engineered for signal transmission and field instrument interconnection within demanding continuous-process industrial installations:

• Intrinsically Safe (IS) Fieldbus Networks: Interconnecting field sensors and actuators in Zone 0, Zone 1, and Zone 2 classified hazardous environments.
• Process Automation Infrastructure: Chemical refining plants, petrochemical complexes, pharmaceutical cleanrooms, and municipal water treatment works.
• Process Instrumentation Cabling: Powering and communicating with pressure transmitters, temperature sensors, and modulating control valves.
• Confined Industrial Spaces: Indoor routing where LSZH safety standards (IEC/EN 60754, IEC/EN 61034) are mandatory to protect personnel and technical assets.

Specifications & Dimensions

The standard Veriflex Profibus PA LSZH cable is manufactured under part number VBUPPA02G7LSBU0 as a single-pair cable (1P × 18/1 AWG / 0.85 mm²), featuring an outer sheath nominal diameter of 7.6 mm and a nominal weight of 89 kg/km. Designed for a maximum operating voltage of 300V across a fixed temperature range of -30°C to +80°C, it maintains a minimum bending radius of 10 times the overall diameter and withstands an installation pulling force of up to 120 N. Electrical characteristics at 20°C include a maximum conductor DC resistance of 22 Ω/km, a mutual capacitance of 60 nF/km at 800 Hz, an inductance of 0.7 mH/km at 31.25 kHz, and an insulation resistance of at least 5.0 GΩ·km. The characteristic impedance is rated at 100 Ω at 31.25 kHz and 39 kHz, 80 Ω at 1 MHz, and 150 Ω (±10%) from 3 MHz to 20 MHz, with signal attenuation ratings of 3.0 dB/km max at 39 kHz, 4.0 dB/km nom at 100 kHz, and 15.0 dB/km nom at 1 MHz.

Standards

Fieldbus & Design Specifications: IEC 61158, Profibus PA Industrial Guideline
Flame Retardancy: BS EN/IEC 60332-1-2 (Single cable vertical flame propagation)
Halogen Acid Gas Evolution: IEC/EN 60754-1/2 (Zero halogen emissions)
Smoke Emission Density: IEC/EN 61034-1/2 (Low smoke opacity)
Operating Ratings: Maximum voltage: 300V; Fixed Temperature: -30°C to +80°C; Bending Radius: 10 × overall diameter; Max Pulling: 120 N
Regulatory Compliance: EN 50575 (CPR Compliant), Low Voltage Directive 2014/35/EU, RoHS Directive 2015/65/EU, REACH EC 1907/2006, CE Marked

Frequently Asked Questions

Q: What is the primary difference between Profibus PA and Profibus DP fieldbus cables?
A: Profibus DP is built for high-speed factory automation (up to 12 Mbps) with a characteristic impedance of 150 Ω, whereas Profibus PA operates at a fixed 31.25 kHz with 100 Ω impedance to provide line power and data transmission to instruments located in intrinsically safe explosive environments.

Q: Why is the outer sheath of this Profibus PA cable blue?
A: The industrial blue outer sheath is the international color code identifying cables designated for intrinsically safe (IS) circuits and hazardous location instrumentation networks.

Q: What are the benefits of the dual-layer screening (Al/PET + TCWB)?
A: The Aluminium/Polyester tape provides 100% optical coverage against high-frequency electrostatic noise, while the 60% tinned copper braid provides physical protection and reduces low-frequency electromagnetic interference, delivering a low transfer impedance of 15 mΩ/m at 100 kHz.

Q: What payment terms are supported by Huadong Cable for international export orders?
A: We accept standard international commercial payment terms, including Telegraphic Transfer (T/T, 30% advance deposit and 70% against shipping documents) and 100% Irrevocable Letter of Credit (L/C) at sight.

Veriflex Profibus PA LSZH Cable – Why Choose Huadong Cable?

Huadong Cable Group manufactures Veriflex Profibus PA LSZH fieldbus cables in accordance with IEC 61158 and European safety regulations. Every production drum is inspected in accredited testing laboratories for loop resistance, characteristic impedance, attenuation, transfer impedance, and zero-halogen combustion properties. Our production facilities utilize high-purity solid copper conductors, precision solid PE extrusion lines, and automated braiding machinery to guarantee dimensional stability and transmission consistency.

With more than 20 years of precision cable engineering expertise, Huadong Cable Group operates manufacturing and testing workshops certified to ISO 9001, CE, CPR (EN 50575), RoHS, and REACH protocols. Sourcing directly from the manufacturer avoids third-party agent markups, providing competitive pricing, 100% Mill Test Certificates (MTC) tested in accredited testing facilities, continuous drum lengths packaged on ISPM 15 heat-treated export reels, and dependable logistics for international automation and EPC projects.