Bently Nevada 21504-00-48-10-00 Proximity Probe

21504-00-48-10-00 8mm Vibration Sensor by Bently

Product Introduction

The 21504-00-48-10-00 belongs to Bently Nevada’s trusted 7200 series. This proximity transducer system measures static and dynamic shaft positions relative to the probe tip. It provides a calibrated linear range of 80 mils (2.0 mm), beginning at just 10 mils from the probe face. With a scale factor of 200 mV/mil, this sensor delivers precise vibration data for predictive maintenance. Its frequency response reaches 10 kHz, capturing high-speed events in rotating machinery. The probe’s 3/8-24 threaded case simplifies installation in standard mounting holes. Additionally, the system includes a 1.0-meter total length with a flexible lead, making it adaptable to various machine layouts.

Technical Specifications

The Bently Nevada 21504-00-48-10-00 operates on a DC input range of -17.5 V to -26 V, drawing a maximum of 12 mA. Its output offers a scale factor of 200 mV/mil (±4% when system-calibrated), with linearity within 0.8 mils under system calibration. The frequency response extends from 0 to 10 kHz, with only a -5% deviation at the upper limit. Temperature sensitivity typically changes by -3% at +150°F (+65°C) and a 50-mil gap. The system includes an unthreaded length of 0 mm and a 4.8-inch overall case length. For connectivity, the 21504-00-48-10-00 comes without a connector, offering users flexibility for custom cabling. The probe diameter is 8 mm, and the construction uses standard case material with no lead armor.

Mechanical and Environmental Limits

This Bently Nevada probe withstands harsh conditions. The Proximitor operates between -60°F and +212°F, while the probe and cable handle -30°F to +350°F. Relative humidity up to 95% non-condensing is acceptable. Moreover, the 8-mm probe resists corrosion from air, water, lube oil, ammonium hydroxide, 10% sulfuric acid, MEK, and DMF. The total system weight is 1.3 lbs (0.59 kg). These features ensure reliable performance in steam turbines, compressors, and fans.

Installation Guidelines

Mount the 21504-00-48-10-00 using the 3/8-24 thread, ensuring the gap is set within the 10-to-90 mil range for optimal linearity. First, clean the mounting surface to avoid false readings. Next, connect the power supply to a stable -24 Vdc source, respecting the 12 mA limit. Then, route the cable away from high-interference sources like motor leads. For best results, calibrate the system as a complete unit—probe, cable, and Proximitor—to achieve the ±4% accuracy. Finally, secure the cable with appropriate clamps to prevent movement during operation.

Packaging and Shipping

Your order for the 21504-00-48-10-00 includes one Proximity Probe, one Proximitor, and an extension cable. The package also contains mounting hardware and installation instructions. All items come in factory-sealed anti-static bags. We ship via FedEx, UPS, or DHL with tracking and insurance. Delivery typically takes 3–5 business days, depending on the destination.

Frequently Asked Questions

Q1: What is the calibrated range of the 21504-00-48-10-00?
A1: The calibrated range is 80 mils (2.0 mm), starting at 10 mils from the probe face.

Q2: Can this probe work with a -24 Vdc power supply?
A2: Yes, the input range is -17.5 Vdc to -26 Vdc, so -24 Vdc is perfectly acceptable.

Q3: Is the 21504-00-48-10-00 interchangeable with other 8mm probes?
A3: Yes, but interchangeability errors may widen linearity to ±2.3 mils. For best accuracy, calibrate the complete system.

Q4: What is the maximum cable length for this sensor?
A4: The total length is 1.0 meter (39 inches) with a tolerance of +0.25 m / -0.10 m.

Q5: Does the probe resist chemical exposure?
A5: Yes, it resists air, water, lube oil, 10% sulfuric acid, MEK, and DMF without performance loss.