I. Model Analysis (330854-AAA-BB-CC)

330854: 3300 XL 25mm System Extension Cable (Special for Differential Expansion / Large Displacement)

040: Cable Length → 4.0m (4 meters)

25: Cable Type → High Temperature Armoring (-40°C to +120°C, Metal Armature Resistant to Traction / Rat Attack)

05: Certification → Explosion-proof (ATEX/IECEx), applicable to Zone 0/1/2 Hazardous Areas (Oil/Gas / Chemical)

II. Core Parameters

1. Electrical and Compatibility

Compatible System: 3300 XL 25mm (Probe 330851, Preamplifier 330850)

Standard Sensitivity: 0.787V/mm (20mV/mil)

Linear Range: 0 to 12.7mm (500mil), specially designed for Differential Expansion

Connector: Special Coaxial, Waterproof and Dustproof, Double Layer Shielding (Single End Grounding)

Signal Transmission: Non-separable / Jointable, the length must strictly match the probe + preamplifier

2. Mechanical and Environmental

Cable Structure: FluidLoc High Temperature Insulation Layer + Stainless Steel Armoring

Length: 4.0m; Outer Diameter ≈ 8mm; Minimum Curvature Radius ≥ 60mm

Protection: IP67; Anti-Vibration 10g; Oil-resistant, Aging-resistant, Hydrocracking-resistant

Temperature: -40°C to +120°C (Cable)

Certification: Explosion-proof (05), applicable to Hazardous Areas

Weight: ≈ 0.42kg

III. System Kit (Must be the same length + the same certification)

1. Complete 4m Explosion-proof Armored Differential Expansion System

Probe: 330851-XXX-XXX-XXX-040-XXX-XXX-05 (4m, 25mm)

Extension Cable: 330854-040-25-05 (4m, Armored, Explosion-proof)

Preamplifier: 330850-040-05 (4m System, Explosion-proof)

Monitoring Module: 3500/45M (Differential Expansion / Axial Displacement)

2. Applicable Scenarios

✅ Turbine / Generator ** Differential Expansion (DE) ** Monitoring (Most Commonly Used)

✅ Medium Distance (4m), High Temperature + Strong Mechanical Protection (Armored) + Explosion-proof Hazardous Area

✅ Hydrogen-cooled Generator, Sealed Unit, Oil-Gas Chemical Equipment

✅ Harsh Sites requiring protection against Traction / Rat Attack / Sharp Object Scratches

IV. Comparison of Key Models in the Same Series (25mm Extension Cable) Table

Model Length Cable Type Approval Applicable Scenarios

330854-040-25-05 4m High-temperature armored Explosion-proof Intermediate distance + Strong protection + Hazard zone

330854-040-24-05 4m High-temperature non-armored Explosion-proof Intermediate distance + Ordinary protection + Hazard zone

330854-080-25-05 8m High-temperature armored Explosion-proof Long distance + Strong protection + Hazard zone

330854-040-25-00 4m High-temperature armored No Intermediate distance + Strong protection + Ordinary zone

V. Installation Tips

Length matching: 4m cables must be paired with 4m probes + 4m preamplifiers; do not mix 8m/12m.

Armored grounding: Both ends of the metal armor are grounded; the shielding layer is grounded at one end only to suppress ground circulating current.

Installation specifications: Curvature ≥ 60mm; avoid proximity to high-temperature heat sources (> 120°C); avoid crushing / sharp bends.

Explosion-proof sealing: Hazard zone connectors must be sealed, in accordance with ATEX/IECEx specifications.

VI. Common Confusions and Clarifications

❌ Not 8mm/50mm cables: 330854 is exclusively for the 25mm differential expansion system; it cannot be mixed with 330930 (8mm) or 330876 (50mm).

❌ Non-armored ≠ Armored: **25 (armored)** is more resistant to mechanical damage and has a higher price than 24 (non-armored).

✅ Differential expansion specific: Linear range 12.7mm, used for rotor - stator relative expansion, not for small gap vibration.