Description
The Bently Nevada 330195-02-12-50-05 is a high-performance Proximitor Sensor part of the 3300 XL 8 mm proximity transducer system. This module serves as the signal conditioner for non-contacting vibration and position measurements. It generates a high-frequency RF signal through an extension cable and probe, measuring the gap between the probe tip and a conductive target (such as a turbine shaft) via eddy current technology. The sensor converts this gap change into a proportional DC voltage, enabling the monitoring of radial vibration, axial thrust, and speed.
Commercial and Availability Status
-
Condition: New Original (Factory Sealed Surplus)
-
Warranty: 12-Month Comprehensive Warranty
-
Availability: In Stock
-
Lead Time: Ships within 1 to 2 business days
-
Pricing Note: Price is subject to market supply and OEM price adjustments. Contact our procurement team for a firm, itemized commercial quote.
Technical Specifications
| Parameter | Specification / Value |
| Model Number | 330195-02-12-50-05 |
| System Compatibility | 3300 XL 8 mm Proximity Transducer System |
| Scale Factor | 200 mV/mil (7.87 V/mm) nominal |
| Total System Length | 5.0 meters (System 5.0) |
| Mounting Option | 35 mm DIN rail or Panel Mount |
| Agency Approvals | Multiple Approvals (ATEX, IECEx, CSA, TR CU) |
| Power Requirement | −17.5 to −26 V DC (typically −24 V DC) |
| Linear Range | 80 mils (2.0 mm) |
| Frequency Response | 0 to 10 kHz (+0, −3 dB) |
| Operating Temperature | −51 to +100 °C (−60 to +212 °F) |
| Output Impedance | 50 Ω |
Part Number Configuration Breakdown
Understanding the specific configuration for the 330195-02-12-50-05 is essential for maintaining system calibration:
-
330195: Base Proximitor Sensor (3300 XL series).
-
-02: Total Length and Mounting Option: 5.0 meters (16.4 ft) system length, DIN mount.
-
-12: Agency Approval Option: Multiple Approvals (CSA, ATEX, and IECEx for North American and European hazardous areas).
-
-50: Hardware Option: 5.0 meter system calibration (requires a 5.0m extension cable and probe combination).
-
-05: Certification Option: Standard multi-approval certification package.
Technical Architecture and Calibration Integrity
The 3300 XL Proximitor sensor is highly immune to radio frequency interference (RFI) and is designed to provide stable data even in the presence of fluctuating electrical noise.
System Matching
The “-50” option signifies that this Proximitor is factory-calibrated for a 5.0-meter system. In proximity systems, the electrical length of the probe and extension cable combined must match the Proximitor’s internal bridge calibration.
Critical Field Note: Never mix a 5.0m Proximitor with a 9.0m extension cable. Doing so will result in a significant “Scale Factor” error (deviation from the standard 200 mV/mil), leading to inaccurate vibration readings and potentially masking a high-vibration event.
Output Terminal Configuration
The module features four primary terminals:
-
VT (Voltage Terminal): Supplies the proportional DC voltage to the monitor rack.
-
COM (Common): The signal return/ground path.
-
PROBE: The coaxial connection for the extension cable.
-
PWR (Power): Accepts the −24 V DC input from the 3500/3300 rack.
Engineering and Installation Guidelines
1. Electrical Isolation
The Proximitor case is isolated from the internal circuitry. However, to maintain the signal-to-noise ratio, the DIN rail must be properly grounded to the machinery protection system (MPS) ground. Ensure the coaxial connectors (between probe and extension cable) are insulated using the supplied silicone tape or heat-shrink tubing to prevent “ground loop” interference.
2. Gap Verification (Voltage Check)
During installation, set the probe gap by measuring the DC voltage at the Proximitor output terminals.
-
Standard Gap: For most 3300 XL systems, the “center of the linear range” is approximately −10 V DC (equivalent to a 40-mil gap).
-
Verification: Adjust the probe depth until the voltmeter reads −10 V DC ±0.5 V before tightening the probe housing locknuts.
3. Maximum Load Resistance
The Proximitor is designed to drive signals over long distances. For a standard −24 V DC supply, the maximum load resistance (including the field cable and monitor input impedance) should not exceed 10,000 Ω to ensure signal linearity at high vibration amplitudes.
Frequently Asked Questions
Is the 330195 compatible with the older 3300 (non-XL) 8 mm probes?
Yes, the 3300 XL Proximitor is designed to be backward compatible with 3300-series 8 mm probes and extension cables. However, using the XL Proximitor with non-XL probes may result in a slightly different thermal stability profile than a pure XL system.
What should I do if the “OK” LED on the monitor goes off?
A “Not OK” status usually indicates a fault in the transducer loop. Check the DC bias voltage. If the voltage is near 0 V, there is likely a short in the extension cable or probe. If the voltage is near −24 V, there is likely an open circuit (e.g., a snapped probe tip or disconnected cable).
Can this module be used for speed sensing?
Yes. When aimed at a keyway or gear tooth, the 330195-02-12-50-05 provides a sharp voltage pulse that a Bently Nevada 3500/50 Tachometer module can use to calculate RPM and phase angle (Keyphasor).
