Product Series and Classification

This model belongs to the trusted 3300 XL series from Bently Nevada. It falls under the Sensor, Transducer & Probe product category. The Bently Nevada 330881-28-07-038-08-02 comes fully assembled and tested. Users do not need to purchase separate components for installation.

Technical Specifications

Probe Configuration

The system uses a 3300 XL 8 mm probe with multiple approvals. The standoff adapter has a 70 mm B dimension. The probe penetration offers a 38 mm C dimension. Mounting threads follow the 3/4-14 NPT standard.

Electrical Parameters

This transducer requires a DC power supply from -17.5 Vdc to -26 Vdc. The maximum current consumption reaches 12 mA. The output resistance sits at 50 Ω. Supply sensitivity stays below 2 mV output change per volt input change.

Measurement Capabilities

The linear range measures 2 mm (80 mils) for accurate readings. The recommended gap setting is 1.27 mm (50 mils). The incremental scale factor (ISF) reaches 7.87 V/mm (200 mV/mil) with ±5% accuracy. Deviation from best fit straight line stays under ±0.025 mm (±1 mil).

Frequency Response

The Bently Nevada 330881-28-07-038-08-02 offers a frequency response from 0 to 10 kHz at -3 dB. This performance works with up to 305 metres (1000 feet) of field wiring. The system handles high-frequency vibration signals effectively.

Environmental Limits

The probe operates between -51°C and +177°C (-60°F to +350°F). Note that temperatures below -34°C (-29°F) may damage the pressure seal. The housing carries an IP66 rating verified by BASEEFA report T07/0709.

Material Construction

The probe tip uses Polyphenylene Sulfide (PPS) material. The probe case consists of AISI 304 stainless steel. The 1-metre cable uses 75 Ω triaxial design with FEP insulation. The connector features gold-plated brass ClickLoc technology.

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. Outer sleeve and retaining screws use AISI 303 stainless steel.

Mechanical Strength

The probe tensile strength reaches 330 N (75 lb) between cable and case. The housing supports 912 N (205 lbf) at 38 mm from the unsupported end. Impact strength meets 4 Joule certification at -39°C and 115°C. CSA verifies 7 Joule impact resistance at room temperature.

Installation Guidelines

Mount the Bently Nevada 330881-28-07-038-08-02 using the 3/4-14 NPT threads. Tighten the retaining nut to 29.5 N·m (260 in·lb). Tighten the probe sleeve locknut to 39.3 N·m (350 in·lb). Use 3-conductor shielded triax cable for field wiring. The field wiring gauge should range from 16 to 24 AWG.

The minimum target size is 15.2 mm (0.6 inches) diameter for a flat target. The minimum shaft diameter is 50.8 mm (2.0 inches) for proper measurement.

Environmental Tolerance

The IP66 housing resists dust and high-pressure water jets. The neoprene sleeve O-ring provides a reliable seal. The extra soft cellular silicone offers vibration isolation. The system operates reliably in harsh industrial environments.

Package List

• 1 x Bently Nevada 330881-28-07-038-08-02 PROXPAC XL transducer

• 1 x Pre-attached 1-metre triaxial probe cable

• 2 x PG21 x M20 conduit fittings

• 1 x Conduit plug

• 1 x Grounding liner and retaining plate

• 1 x Product installation manual

Frequently Asked Q330881-28-07-038-08-02uestions (FAQ)

1. What machinery can I monitor with the Bently Nevada 330881-28-07-038-08-02?
You can monitor steam turbines, gas turbines, compressors, and large pumps. The transducer measures radial shaft vibration and axial position.

2. Does this probe work with a 3/4-14 NPT mounting hole?
Yes, the Bently Nevada 330881-28-07-038-08-02 includes the 0 2 mounting thread option. This provides a 3/4-14 NPT thread for direct installation.

3. What happens if I operate below -34°C?
Operating below -34°C (-29°F) may cause premature failure of the pressure seal. Keep the probe within the rated temperature range for reliable service.

4. Can I extend the field wiring beyond 305 metres?
The maximum recommended field wiring length is 305 metres (1000 feet). Longer wiring will reduce the frequency response and signal quality.

5. How do I set the correct gap for this transducer?
Set the gap to 1.27 mm (50 mils) for optimal linear range performance. This gives you approximately -10 Vdc output at the recommended operating point.