Product Overview

The Bently Nevada 330880-28-00-085-02-02 is a PROXPAC XL Proximity Transducer. This unit provides reliable shaft vibration and position measurements for rotating machinery. The 330880-28-00-085-02-02 includes a 3300 XL 8 mm probe with multiple approvals. Engineers frequently trust this sensor for turbines, compressors, and large pumps. Moreover, the rugged design ensures stable performance in harsh industrial environments. Finally, the 85 mm probe penetration suits many standard machine configurations.

Technical Specifications

Measurement & Performance

This transducer offers a linear range of 2 mm (80 mils). Specifically, the linear range starts at 0.25 mm from the target. It then extends from 0.25 mm to 2.3 mm (10 to 90 mils). As a result, the output voltage spans approximately -1 Vdc to -17 Vdc. For optimal results, the recommended gap setting is 1.27 mm (50 mils).

Additionally, the Incremental Scale Factor (ISF) is 7.87 V/mm (200 mV/mil). This value includes a ±5% interchangeability error. The system measures this over the 80 mil linear range. Furthermore, the temperature range for this measurement is 0 °C to +45 °C. Meanwhile, the Deviation from Straight Line (DSL) stays less than ±0.025 mm (±1 mil).

Frequency Response & Resolution

The frequency response operates from 0 to 10 kHz. Consequently, the signal drops by only -3 dB at the high end. Notably, this performance includes up to 305 metres of field wiring. For reference, the minimum target size is 15.2 mm (0.6 inches) diameter. Likewise, the minimum shaft diameter is 50.8 mm (2.0 inches). Therefore, these parameters ensure accurate readings on standard machinery.

Probe & Cable Details

This assembly contains a 3300 XL 8 mm probe with approval option 28. The probe tip material is Polyphenylene Sulfide (PPS) . Meanwhile, the probe case uses AISI 304 stainless steel. The probe cable length is 1 metre of 75 Ω triaxial type. Additionally, the cable uses FEP (fluoroethylene propylene) insulation. A gold-plated brass ClickLoc connector terminates the cable end. Finally, the probe tensile strength reaches 330 N (75 lbs) between cable and case.

Housing & Mechanical Construction

The housing uses UV-resistant glass-reinforced PPS thermoplastic. This material contains conductive fibers for static dissipation. The sleeve and retaining chain use AISI 304 stainless steel. In contrast, the outer sleeve and retaining screws use AISI 303 stainless steel. The sleeve O-ring is made of Neoprene. Similarly, the grounding liner and retaining plate use AISI 304 stainless steel. For vibration control, the isolation uses extra soft cellular silicone. Finally, the lid label is gloss radiant white polyester.

Torque Specifications

For secure assembly, the retaining nut torque is 29.5 N·m (260 in·lb) . Meanwhile, the probe sleeve locknut torque is 39.3 N·m (350 in·lb) . Therefore, follow these values exactly to avoid damage. Otherwise, over-torquing may strip threads or crack the housing.

Housing Strength & Impact Ratings

The housing supports 912 N (205 lbs) of force. This force applies 38 mm from the unsupported end. However, the cover must be fastened with the grounding liner installed. Impact strength meets BASEEFA certification for 4 Joule impacts. Notably, the device withstands impacts at -39 °C and +115 °C. Additionally, CSA verified a 7 Joule impact at room temperature. As a result, the housing carries an IP66 rating verified by BASEEFA report T07/0709.

Environmental Limits & Power

The probe operates from -51 °C to +177 °C (-60 °F to +350 °F) . However, do not expose the probe below -34 °C without caution. Cold temperatures may cause premature failure of the pressure seal. Regarding power, the supply requires -17.5 Vdc to -26 Vdc without barriers. With barriers, use -23 Vdc to -26 Vdc. Consequently, operation above -23.5 Vdc reduces the linear range. Moreover, supply sensitivity stays less than 2 mV change per volt change. Finally, output resistance is 50 Ω.

Field Wiring Requirements

For field connections, use 0.2 to 1.5 mm² (16 to 24 AWG) wiring. Bently Nevada recommends 3-conductor shielded triax cable. Additionally, use tinned field wiring for best corrosion resistance. The maximum wiring length is 305 metres (1,000 feet) between the proximitor and monitor. However, longer cables may reduce high-frequency response.

Incremental Scale Factor Details

The Incremental Scale Factor (ISF) of 7.87 V/mm (200 mV/mil) includes interchangeability error. Therefore, you can replace the probe without recalibrating the system. The measurement uses increments of 0.25 mm (10 mils). Furthermore, the valid temperature range for this specification is 0 °C to +45 °C. Finally, the DSL for a standard 1 metre system is less than ±0.025 mm.

Installation Guide

Follow these steps to install the Bently Nevada 330880-28-00-085-02-02 properly. First, prepare a clean mounting surface on the machine case. Next, install the two 3/4-14 NPT fittings (included) into the housing ports. Then, install the plug in the unused port.

After that, mount the probe with the correct 85 mm penetration. Set the air gap to 1.27 mm (50 mils) from the shaft surface. Subsequently, tighten the retaining nut to 29.5 N·m. Also tighten the probe sleeve locknut to 39.3 N·m. For wiring, connect the field wiring using 16 to 24 AWG triax cable. However, keep the total wiring length under 305 metres.

Next, connect the power supply between -17.5 Vdc and -26 Vdc. Verify the voltage does not exceed -23.5 Vdc if you need full linear range. Then, test the output voltage. At 1.27 mm gap, expect approximately -10 Vdc. Finally, secure the housing lid and verify the IP66 seal.

Package Contents

• One Bently Nevada PROXPAC XL Proximity Transducer (Model 330880-28-00-085-02-02)

• One 3300 XL 8 mm probe with multiple approvals (option 28)

• One 1-metre triaxial cable with FEP insulation

• Two 3/4-14 NPT fittings and one plug

• One gold-plated brass ClickLoc connector (pre-attached)

• One mounting sleeve with locknut

• One grounding liner and retaining plate

• One vibration isolation pad

• Installation instruction sheet

Frequently Asked Questions (FAQ)

1. What is the probe penetration of the 330880-28-00-085-02-02?
The probe penetration (C dimension) is 85 mm (085) . This is the distance from the mounting thread to the probe tip. No standoff adapter is included on this model.

2. Can I use the Bently Nevada 330880-28-00-085-02-02 in wet environments?
Yes, the housing has an IP66 rating verified by BASEEFA. Consequently, it resists powerful water jets and dust ingress. Thus, it is suitable for outdoor or wash-down areas.

3. What approvals does the probe option 28 carry for the 330880-28-00-085-02-02?
The 3300 XL 8 mm probe with option 28 carries multiple agency approvals. These include CSA, ATEX, and IECEx for hazardous locations. Therefore, contact Bently Nevada for the complete certification list.

4. What is the maximum cable length for this transducer?
You can run up to 305 metres (1,000 feet) of field wiring. For best results, use 3-conductor shielded triax cable. However, longer cables may reduce the frequency response above 10 kHz by more than -3 dB.

5. How do I set the correct gap for the 330880-28-00-085-02-02?
Set the gap to 1.27 mm (50 mils) from the target. This gap produces approximately -10 Vdc output. Use a micrometer or precision tool for best accuracy. Always verify with a voltmeter after installation.