330191-00-16-20-CN Bently Nevada 3300 XL 8 mm Proximity Probe

Problem: Unreliable Vibration Data in Harsh Machinery Environments

Rotating machinery in oil, gas, and power generation demands precise displacement measurement. However, standard probes often fail due to cable pull-out, chemical ingress, or mechanical abuse. The Bently Nevada 330191-00-16-20-CN addresses these exact failure modes. This 3300 XL 8 mm ETR probe uses a patented TipLoc molding method. Consequently, the bond between probe tip and body resists vibration and thermal cycling. Additionally, the CableLoc design provides 330 N (75 lbf) pull strength. Therefore, cable separation becomes virtually impossible under normal operating loads.

Solution: Engineering-Grade Accuracy with the 330191-00-16-20-CN

This probe operates from -17.5 Vdc to -26 Vdc with a maximum consumption of 12 mA. When used with nonincendive circuits per installation drawing 140979, it delivers stable performance. The supply sensitivity is less than 2 mV change per volt input change. Furthermore, the output resistance is 50 Ω. The nominal probe DC resistance is 7.88 ± 0.50 Ω from center conductor to outer conductor. The probe tip is molded from polyphenylene sulfide (PPS). This material provides thicker encapsulation of the probe coil. As a result, the probe resists physical abuse better than smaller-diameter alternatives. The case is constructed from AISI 303 or 304 stainless steel. The standard cable is 75 Ω triaxial with FEP insulation. The total length of this specific unit is 2.0 meters (6.6 feet). The overall case length is 1.6 inches. The thread is 3/8-24 UNF with a maximum engagement length of 0.563 inches. The unthreaded length is 0.0 inches minimum. This probe weighs 323 g/m (11.4 oz).

Technical Specifications: 330191-00-16-20-CN

• Input Voltage: -17.5 Vdc to -26 Vdc
• Current Consumption: 12 mA maximum
• Output Resistance: 50 Ω
• Probe DC Resistance: 7.88 ± 0.50 Ω
• Total Length: 2.0 meters (6.6 feet)
• Case Length: 1.6 inches
• Thread: 3/8-24 UNF
• Probe Tip Material: Polyphenylene sulfide (PPS)
• Case Material: AISI 303 or 304 stainless steel
• Tensile Strength: 330 N (75 lbf) probe case to lead

Installation and Integration for the 330191-00-16-20-CN

Install this probe with Bently Nevada extension cables and Proximitor sensors. The entity parameters are met only with BN extension cables. For one-meter systems, do not use an extension cable. However, this 2.0-meter probe requires an extension cable for proper operation. Verify that the nonincendive circuit follows installation drawing 140979. The maximum connector torque is 0.565 N•m (5 in•lbf). The probe seals differential pressure between tip and case using a Viton O-ring. Note that probes are not pressure tested prior to shipment. For country-specific approval, the CN option applies. Always confirm that the approval meets your local requirements.

Maintenance and Reliability

Inspect the probe periodically for mechanical damage or cable wear. Because the CableLoc design provides 330 N pull strength, cable strain is minimized. Nevertheless, check for abrasion in high-vibration areas. The operating temperature range depends on the temperature classification. For EPL Ga and Gc, T1 allows -55°C to +232°C. T4 allows -55°C to +80°C. For EPL Dc, T280°C applies at ambient -55°C to +232°C. Keep the probe tip clean and free of conductive debris. Do not disassemble the probe. Follow the manufacturer's safety manual for all maintenance activities.