Product Overview

The 330880-28-15-285-03-02 is a PROXPAC XL proximity transducer from Bently Nevada. This device is made in the U.S.A. It uses a 3300 XL 8 mm probe with multiple approvals. The transducer measures shaft vibration and position in rotating machinery. The unit is suitable for turbines, compressors, and pumps.

Probe Configuration

The 330880-28-15-285-03-02 includes a 3300 XL 8 mm probe. The standoff adapter option has a B dimension of 1.5 inches. The probe penetration option has a C dimension of 285 mm. The mounting thread option is 3/4-14 NPT. This thread is required when ordering the standoff adapter. The 330880-28-15-285-03-02 fitting option includes one 3/4-14 NPT fitting. It also includes one 3/4-14 NPT to 1/2-14 NPT SST reducer. Two plugs complete the fitting set.

Probe Materials and Construction

The 330880-28-15-285-03-02 probe tip uses Polyphenylene Sulfide (PPS). The probe case is made of AISI 304 stainless steel. The probe cable is 1-metre length, 75 Ω triaxial type. The cable uses fluoroethylene propylene (FEP) insulation. The probe connector is gold-plated brass ClickLoc type. The probe tensile strength maximum is 330 N (75 lb) between cable and case.

Housing Specifications

The 330880-28-15-285-03-02 housing uses UV-resistant material. This is glass-reinforced polyphenylene sulfide (PPS) thermoplastic. The material contains conductive fibers for EMI protection. The sleeve material is AISI 304 stainless steel. The retaining chain is also AISI 304 stainless steel. The outer sleeve and retaining screws use AISI 303 stainless steel. The sleeve O-ring material is Neoprene. The grounding liner and retaining plate use AISI 304 Stainless Steel. Vibration isolation material is extra soft cellular silicone. The lid label material is gloss radiant white polyester.

Torque Specifications

The 330880-28-15-285-03-02 retaining nut torque is 29.5 N·m (260 in·lb). The probe sleeve locknut torque is 39.3 N·m (350 in·lb). Use a calibrated torque wrench for accurate tightening. Overtightening may damage the probe or housing. Undertightening may cause loose connections.

Housing Strength Ratings

The 330880-28-15-285-03-02 housing strength is typically verified. The outer sleeve mounts on a test stand with axis parallel to horizontal. The housing mounts on the outer sleeve through an end hole. The housing supported 912 N (205 lbf) placed 38 mm from the unsupported end. The cover was fastened and grounding liner installed during testing.

Impact Strength Certification

The 330880-28-15-285-03-02 housing impact strength is BASEEFA certified. The device withstands two separate 4 Joule (5.4 ft·lb) impacts. Testing occurs at -39°C (-38°F) and at 115°C (239°F). CSA verified that housing and cover samples withstand 7 Joule (9.5 ft·lb) impact. This testing happens at ambient room temperature.

Environmental Limits

The 330880-28-15-285-03-02 probe operating temperature is -51 °C to +177 °C. This equals -60 °F to +350 °F. Exposing the probe to temperatures below -34 °C (-29 °F) may cause premature pressure seal failure. The housing rating is IP66 verified by BASEEFA report number T07/0709.

Power Requirements

The 330880-28-15-285-03-02 requires -17.5 Vdc to -26 Vdc power. This applies without barriers at 12 mA maximum consumption. With barriers, the range is -23 Vdc to -26 Vdc. Operation above -23.5 Vdc reduces linear range. Supply sensitivity is less than 2 mV change per volt change. Output resistance is 50 Ω.

Field Wiring Specifications

The 330880-28-15-285-03-02 field wiring accepts 0.2 to 1.5 mm² (16 to 24 AWG). Use 3-conductor shielded triax cable for best performance. Use tinned field wiring for reliable connections. Maximum length between the proximitor sensor and monitor is 305 metres (1,000 feet). Signal rolloff occurs at high frequencies with longer wiring.

Linear Range and Scale Factor

The 330880-28-15-285-03-02 linear range is 2 mm (80 mils). Linear range begins at approximately 0.25 mm (10 mils) from target. The range extends from 0.25 mm to 2.3 mm (10 to 90 mils). This corresponds to approximately -1 Vdc to -17 Vdc. The recommended gap setting is 1.27 mm (50 mils). The incremental scale factor (ISF) is 7.87 V/mm (200 mV/mil) ±5%. This includes interchangeability error over the 80 mil linear range. Measurement occurs from 0 °C to +45 °C (+32 °F to +113 °F).

Frequency Response and Target Size

The 330880-28-15-285-03-02 frequency response is 0 to 10 kHz. The tolerance is +0, -3 dB with up to 305 metres of field wiring. The minimum target size is 15.2 mm (0.6 in) diameter for a flat target. The minimum shaft diameter is 50.8 mm (2.0 in). Deviation from best fit straight line (DSL) is less than ±0.025 mm (±1 mil). This applies with components at 0 °C to +45 °C.

Total System Weight

The 330880-28-15-285-03-02 total system weight is 1.44 kg (3.2 lb) typical. This measurement uses 0.3 metre (12 in) sleeve length. The weight is manageable for single-person installation. The rugged construction ensures long-term reliability.

Installation Guidelines

Mount the 330880-28-15-285-03-02 probe perpendicular to the target shaft. Set the initial gap to the recommended 1.27 mm (50 mils). 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). Connect the 3-conductor shielded triax cable to the field wiring. Apply power between -17.5 Vdc and -26 Vdc. Verify the output voltage is within -1 Vdc to -17 Vdc range. Check that the probe temperature stays above -34 °C (-29 °F). Ensure the housing is properly grounded using the AISI 304 liner. Test the system with a shaft runout simulation before production use.

Package List

• 1 x Bently Nevada 330880-28-15-285-03-02 PROXPAC XL Transducer

• 1 x 3300 XL 8 mm probe with multiple approvals

• 1 x 3/4-14 NPT fitting

• 1 x 3/4-14 NPT to 1/2-14 NPT SST reducer

• 2 x Plugs for unused ports

• 1 x Installation manual with torque specifications

Frequently Asked Questions (FAQ)

Q1: What is the standoff adapter B dimension of 1.5 inches used for?
The adapter spaces the probe properly from the mounting surface. The 330880-28-15-285-03-02 B dimension sets the probe position relative to the target.

Q2: Can this probe operate below -34°C continuously?
No, prolonged exposure below -34°C may cause seal failure. The 330880-28-15-285-03-02 should avoid these extreme low temperatures.

Q3: What happens if I use a supply voltage more positive than -23.5 Vdc?
The linear range of the 330880-28-15-285-03-02 will reduce. Always maintain power at -23.5 Vdc or more negative with barriers.

Q4: What is the purpose of the conductive fibers in the housing?
The fibers provide electromagnetic interference protection. The 330880-28-15-285-03-02 housing shields the internal electronics from noise.

Q5: How do I verify the correct gap setting?
Use a voltmeter to measure the output voltage. The 330880-28-15-285-03-02 should read approximately -10 Vdc at the 1.27 mm (50 mil) gap.