The 330906-02-12-50-02-CN belongs to Bently Nevada’s 3300 NSv series. This reverse mount probe works perfectly in harsh compressor environments. Its chemical resistance is significantly better than older 3300 RAM probes. Additionally, the side-view performance exceeds that of the 3000-series 190 probe when gapped at the same distance. Users can rely on this probe for stable operation over a wide temperature range.
The 330906-02-12-50-02-CN includes a total length option of 5.0 meters (16.4 feet). Its connector option features a miniature coaxial ClickLoc type with standard cable. The agency approval option is labeled CN for country-specific requirements.
For probe DC resistance, the 330906-02-12-50-02-CN shows 5.3 ± 0.7 ohms from the center conductor to the outer conductor. The linear range reaches 1.5 mm (60 mils). This range starts at approximately 0.25 mm (10 mils) from the target. It extends from 0.25 to 1.75 mm (10 to 70 mils), which corresponds to roughly -1 to -13 Vdc. The recommended gap setting is 1.0 mm (40 mils).
Field wiring requires 0.2 to 1.5 mm² (16 to 24 AWG) conductors. For ferrules, use 0.25 to 0.75 mm² (18 to 23 AWG). A three-conductor shielded triad cable is recommended. The maximum length between the 3300 XL NSv Proximitor Sensor and the monitor is 305 meters (1,000 feet). For longer field wiring lengths, check the frequency response graphs for signal rolloff at high frequencies.
The probe tip material is Polyphenylene sulfide (PPS). Its case uses AISI 304 stainless steel (SST). For reverse mount probes like the 330906-02-12-50-02-CN, the maximum rated torque is 22.6 N•m (200 in•lb). Bently Nevada recommends 7.5 N•m (66 in•lb) for safe installation.
System weight typically ranges from 14 to 150 g (0.5 to 5.3 oz). The probe case thread is M10x1 with a maximum thread engagement length of 15 mm.
Operating and storage temperatures both span from -52°C to +177°C (-62°F to +351°F). However, exposing the probe to temperatures below -34°C (-30°F) for a sustained period may cause premature failure of the pressure seal. The 3300 NSv probe seals differential pressure between the tip and case using a Viton O-ring.
First, ensure the target surface is clean and smooth. Next, thread the reverse mount probe carefully into the mounting hole. The threads are 3/8-24 UNF for this model. Use a torque wrench to apply 7.5 N•m (66 in•lb). Do not exceed 22.6 N•m. Then connect the miniature coaxial ClickLoc connector until it locks audibly. This locking mechanism prevents loosening from vibration. Finally, verify the gap setting at 1.0 mm (40 mils) before operation.
330906-02-12-50-02-CN reverse mount probe (5.0 m cable)
Miniature coaxial ClickLoc connector (pre-attached)
Installation instructions sheet
Note: Certificates and warranty documents are not included in the package.
We ship worldwide via FedEx, UPS, or DHL. Delivery times depend on your location.
1. What makes the 330906-02-12-50-02-CN better for compressors?
Its chemical resistance is much higher than the 3300 RAM probe. Therefore, it handles harsh process gas environments reliably.
2. Can I use this probe with a different cable length?
No. The 330906-02-12-50-02-CN comes with a fixed 5.0 meter cable. For other lengths, choose a different ordering code.
3. What happens if I exceed the recommended torque?
Exceeding 22.6 N•m may damage the probe case or threads. Always follow the 7.5 N•m guideline for safe installation.
4. Is the ClickLoc connector compatible with standard coaxial cables?
No. The ClickLoc connector is a proprietary Bently Nevada design. It locks securely but requires matching system components.
5. How do I check the probe’s linear range during setup?
Measure the DC voltage output. The linear range from 0.25 mm to 1.75 mm corresponds to approximately -1 to -13 Vdc. Use a target and a micrometer for accurate gapping.
| Brand Name | Bently Nevada |
| Model No. | 330906-02-12-50-02-CN |
| Product Type | Reverse Mount Probe |
| hasMerchantReturnPolicy | Adjust according to reality |
| Shippingdetails | Adjust according to reality |
