Bently Nevada 21508-02-12-50-02 7200 Proximity Probe

Bently Nevada 21508-02-12-50-02 7200 Proximity Transducer System

Product Introduction

The Bently Nevada 21508-02-12-50-02 forms a complete 7200 Proximity Transducer System. This system combines a high-performance 8 mm reverse mount probe with integral electronics. It provides accurate vibration and position measurements for critical rotating equipment. The transducer system excels in turbines, compressors, pumps, and fans. Its robust design and reliable output make it a preferred choice for condition monitoring professionals worldwide.

Technical Specifications

The 21508-02-12-50-02 model offers comprehensive features for precise measurement applications. The probe diameter measures 8 mm, and the case configuration uses a reverse mount design. This reverse configuration suits installations with limited space or specific mounting requirements. The threads are 3/8-24, and the lead armor is not present on this model.

The total cable length option is 5 meters (195 inches), with a tolerance of +0.6 meter and -0.5 meter. This length provides flexibility for routing from the measurement point to the monitoring equipment. The connector option features a miniature male coaxial connector, which ensures a secure and reliable signal connection.

The input power requirement ranges from -17.5 Vdc to -26 Vdc at a maximum consumption of 12 mA. The calibrated range extends to 80 mils (2.0 mm), beginning at approximately 10 mils (0.25 mm) from the probe face. The scale factor measures 200 mV/mil (7.87 V/mm) with a ±4% tolerance when calibrated as a system. Including interchangeability errors, the tolerance widens to within ±9.5%. Linearity performs within 0.8 mils (0.02 mm) of a 200 mV/mil straight line for system calibration. Including interchangeability errors, linearity remains within 2.3 mils (0.06 mm). The frequency response spans from 0 to 10 kHz (0 to 600,000 cpm), with a -5% deviation at 10 kHz (600,000 cpm).

Environmental Limits and Durability

The Bently Nevada 21508-02-12-50-02 operates reliably across a wide temperature range. The Proximitor operates from -60°F to +212°F (-51°C to +100°C). The probe and extension cable function from -30°F to +350°F (-34°C to +177°C). This broad range suits most industrial environments, from cold outdoor installations to hot machinery compartments.

Temperature sensitivity typically shows a -3% change in scale factor at +150°F (+65°C) at a 50 mil gap (1.27 mm). This minimal variation ensures stable measurements despite temperature fluctuations. The system handles relative humidity up to 95% non-condensing, making it suitable for humid environments.

Furthermore, the probe demonstrates excellent corrosion resistance. Direct contact with air, water, lube oil, ammonium hydroxide, sulfuric acid (10%), MEK (methyl-ethyl ketone), or DMF (dimethylformamide) does not affect probe operation. This chemical resistance makes the 21508-02-12-50-02 suitable for harsh industrial processes where chemical exposure is common.

System Weight and Physical Characteristics

The complete system weighs 1.3 lbs (0.59 kg) typically. This lightweight design simplifies installation and reduces stress on mounting hardware. The reverse mount configuration with 3/8-24 threads provides secure attachment to machinery housings. The miniature male coaxial connector ensures compatibility with standard extension cables and monitoring systems.

Installation Guidelines

Proper installation of the Bently Nevada 21508-02-12-50-02 ensures optimal performance and longevity. First, select a suitable mounting location on the machinery housing. Ensure the mounting surface is clean, flat, and free from debris. Drill and tap the mounting hole to match the 3/8-24 thread specification.

Next, thread the probe carefully into the mounting hole. Avoid overtightening, which could damage the threads or the probe tip. Adjust the probe penetration to achieve the desired gap. The calibrated range begins at approximately 10 mils (0.25 mm) from the probe face. Use a feeler gauge or precision measuring tool to set the initial gap accurately.

Route the 5-meter cable to the monitoring equipment. Avoid sharp bends, kinks, or excessive tension on the cable. Connect the miniature male coaxial connector to the mating extension cable or monitor input. Secure the cable using appropriate cable ties or clamps to prevent movement or vibration damage.

Packaging List

Your shipment for the Bently Nevada 21508-02-12-50-02 will include the following items:

• 1 x 7200 Proximity Transducer System (complete probe with integral cable)

• 1 x Product Installation Manual

Frequently Asked Questions (FAQ)

1. What is the calibrated range of the Bently Nevada 21508-02-12-50-02?
The 21508-02-12-50-02 offers a calibrated range of 80 mils (2.0 mm). This range begins at approximately 10 mils (0.25 mm) from the probe face, providing a wide measurement window for vibration and position monitoring.

2. What is the scale factor output of this proximity transducer system?
The system delivers a scale factor of 200 mV/mil (7.87 V/mm) with a ±4% tolerance when calibrated as a complete system. This output provides a strong, clear signal for accurate data acquisition.

3. What is the frequency response of the Bently Nevada 21508-02-12-50-02?
The frequency response spans from 0 to 10 kHz (0 to 600,000 cpm), with a -5% deviation at 10 kHz. This wide range captures both low-frequency shaft vibration and higher-frequency events effectively.

4. What environmental conditions can this probe withstand?
The 21508-02-12-50-02 operates from -30°F to +350°F (-34°C to +177°C) for the probe and cable. It also handles 95% relative humidity and resists corrosion from air, water, lube oil, and several chemicals.

5. What shipping methods do you offer for this product?
We ship this item worldwide using major carriers such as Fedex, UPS, and DHL to ensure fast and reliable delivery.