I. Model Analysis (330876-A-B-C-D)

330876: 3300 XL 50mm Large Gap Probe (Ceramic Head)

02: Probe Housing Specification → M14×1.5 Metric Thread, Side Outlet

90: System Total Length → 9.0m (Probe + Extension Cable)

00: Cable Type → High Temperature FluidLoc Non-armored Cable

00: Certification → No Explosion-proof / Third-party Certification

II. Core Parameters

1. Electrical and Measurement

Measurement Range: 0 - 50mm (Linear Zone 2 - 45mm, Compatible with 4140 Steel)

Sensitivity: 40mV/mm (±5%)

Frequency Response: 0 - 5kHz

Output Signal: -24V - 0V DC (Proportional to Gap)

Recommended Gap: 10 - 40mm (Working Point ≈ -20V - -4V)

2. Mechanical and Environmental

Sensor Head: Ceramic (Corrosion-resistant / Anti-hydrogen embrittlement)

Shell: 316 Stainless Steel, M14×1.5 Thread, Side Outlet

Cable: FluidLoc High Temperature (-40°C - +120°C), Non-armored

Length: Probe Body Approximately 100mm, Built-in Cable 9.0m

Protection: IP67 (Dustproof and Waterproof)

Weight: ≈ 2.0kg

III. System Compatibility (Must be a Complete Set)

1. Matching Components

Probe: 330876-02-90-00-00 (50mm, 9m, Non-armored)

Extension Cable: Not Required (Probe Comes with 9m Cable, Direct Connection to Preamplifier)

Preamplifier: 330878-90-00/05 (9m System, Panel Mounting)

Monitoring Module: 3500/40M (Vibration), 3500/45M (Axial Displacement), 3500/50M (Phase)

2. Applicable Scenarios

✅ Large Diameter (＞200mm), Large Gap (10 - 40mm)

✅ Hydrogen-cooled Generator, Sealed Unit, High Temperature / High Pressure Equipment

✅ Turbine Thrust Disk, Hydro Turbine Shaft, Compressor Rotor Monitoring

IV. Comparison of Key Models in the Same Series (50mm Probe) Table

Model Thread Length Cable Approval Applicable Scenarios

330876-02-90-00-00 M14×1.5 9m High-temperature non-armoring No Ordinary high-temperature / hydrogen area

330876-02-90-01-00 M14×1.5 9m High-temperature armored No Strong mechanical protection

330876-02-90-00-05 M14×1.5 9m High-temperature non-armoring Explosion-proof Danger zone (hydrocarbons)

V. Installation and Calibration Key Points

Gap calibration: 50mm probe zero gap ≈ -24V, 10mm ≈ -20V, 40mm ≈ -4V; working point set at 20mm (≈ -16V).

Thread installation: M14×1.5 thread, tightening torque ≈ 25Nm; insulation between the shell and the equipment to avoid ground current.

Cable laying: Non-armored cable avoid crushing / bending (minimum curvature radius ≥ 50mm); suitable for FluidLoc temperature resistance in high-temperature areas.

Length matching: Probe comes with 9m cable, must be paired with 9m preamplifier (330878-90-XX), cannot be cut.

VI. Common Confusion Clarification

❌ Not 8mm/25mm probe: 330876 is exclusive for 50mm large gap, cannot be mixed with 330180 (8/25mm).

❌ Not preamplifier: Preamplifier is 330878 (blue box), probe is 330876 (with long cable).

✅ Hydrogen / high-temperature specific: Ceramic sensing head resistant to hydrogen embrittlement, suitable for extreme conditions such as hydrogen-cooled generators.