BENTLY 149986-01E 3300 XL 8mm Proximity Probe

Overview

The 149986-01E probe has an 8mm diameter sensing tip and is part of a system that includes a compatible proximitor (e.g., 3300 XL 8mm Proximitor) and extension cable. When installed near a conductive target (usually the shaft), it generates a low‑power radio frequency field. Variations in the gap due to shaft motion modulate the impedance of the probe coil, producing a voltage output that is linearly proportional to the distance. This output can be used for both static (position) and dynamic (vibration) measurements.

Key Features

• High Linearity: ±0.025 mm linearity over a standard range of 2 mm.

• Temperature Stability: Low sensitivity to temperature changes, ensuring accurate readings from -35°C to +120°C.

• Interchangeable: Factory‑calibrated with a matching proximitor for easy replacement without field calibration.

• Rugged Construction: Stainless steel housing and integral armored cable (optional) for harsh environments.

• Standard Sensitivity: 7.87 V/mm (200 mV/mil) output scaling for easy integration with monitoring systems.

• Approvals: CSA, ATEX, and IECEx certifications for hazardous area installations (when used with appropriate barriers).

Technical Specifications

• Probe Diameter: 8 mm.

• Measurement Range: 0.25 to 2.3 mm (10 to 90 mils) typical.

• Linear Range: 1.5 mm (60 mils) from the recommended gap.

• Output Voltage: -1 to -17 VDC (with -24Vdc proximitor supply).

• Frequency Response: 0 to 10 kHz (limited by proximitor).

• Cable Length: Available in 1m, 5m, 9m integral or with extension cable.

Applications

The 149986-01E is used to monitor radial vibration (shaft relative vibration), axial position (thrust position), and shaft eccentricity. Typical applications include steam turbines, gas turbines, centrifugal compressors, pumps, and gearboxes. It is also used for keyphasor measurements to provide once‑per‑turn timing signals.

System Integration

The probe connects to a 3300 XL proximitor via a coaxial cable. The proximitor demodulates the signal and provides a voltage output to monitoring systems such as the 3500 series or 1900 series. The combination of probe and proximitor forms a complete measurement chain, with the 149986-01E ensuring accurate and reliable data for machinery protection and diagnostics.

In summary, the BENTLY 149986-01E proximity probe is a fundamental component for non‑contact shaft measurement, offering the precision and durability required for continuous monitoring in demanding industrial environments.