Bently Nevada 330908-12-08-70-02-00 Proximity Probe
This 330908-12-08-70-02-00 proximity probe comes from the 3300 NSv transducer family by Bently Nevada. It measures radial vibration and axial position on rotating machinery. The probe uses a 3/8-24 UNF thread and a 7.0-metre (23.0 feet) unarmored cable.
Key Technical Specifications
The probe cable uses 75 Ω coaxial construction with fluoroethylene propylene (FEP) insulation. At 7.0 metres, the DC resistance from center conductor to outer conductor (RPROBE) is 5.9 ± 0.9 ohms. Additionally, the miniature coaxial ClickLoc connector locks securely onto extension cables and prevents loosening.
Furthermore, the probe case material is AISI 304 stainless steel (SST), and the probe tip uses polyphenylene sulfide (PPS). This pairing provides chemical resistance and mechanical durability in industrial settings.
Mechanical and Environmental Parameters
The 330908-12-08-70-02-00 operates within a temperature range of -52°C to +177°C (-62°F to +351°F) for both operating and storage conditions. However, sustained exposure below -34°C (-30°F) may cause premature failure of the pressure seal.
Moreover, the maximum rated case torque is 33.9 N·m (300 in·lb), with a recommended torque of 11.3 N·m (100 in·lb) for 3/8-24 or M10×1 probe cases. The maximum thread engagement length is 0.563 in for the 3/8-24 thread.
The probe seals differential pressure between tip and case using a Viton O-ring. Note that probes are not pressure tested before shipment. Probe weight ranges from approximately 14 to 150 g (0.5 to 5.3 oz).
Installation Guidelines
First, confirm that the probe length plus the extension cable length equals the Proximitor Sensor total length. This matching requirement keeps the measurement loop properly calibrated.
Next, mount the probe using the 3/8-24 UNF thread and observe the maximum engagement of 0.563 in. Apply the recommended torque of 11.3 N·m (100 in·lb) and never exceed 33.9 N·m (300 in·lb).
Additionally, route the unarmored FEP cable away from sharp edges and hot surfaces. Secure it with suitable clamps to reduce vibration-induced wear. Then connect the miniature coaxial ClickLoc connector firmly to the extension cable.
Finally, note that this model carries option code 00, meaning no agency approval is required. Verify that your installation area does not demand hazardous-location certification.
Packaging List
FAQ
Q1: What thread size does the 330908-12-08-70-02-00 use?
A: The 330908-12-08-70-02-00 features a 3/8-24 UNF thread with a maximum engagement length of 0.563 in.
Q2: What is the total cable length of this probe?
A: This probe provides a 7.0-metre (23.0 feet) total length, shown by the 70 option code in the model number.
Q3: Does this probe include armor protection?
A: No, the 330908 base model is unarmored. The cable uses 75 Ω coaxial FEP insulation without stainless steel armor.
Q4: What is the recommended torque for this probe case?
A: The recommended torque is 11.3 N·m (100 in·lb), while the maximum rated torque is 33.9 N·m (300 in·lb).
Q5: Does this model carry agency approvals?
A: No, option code 00 means approval is not required. Confirm that your installation does not need hazardous-area certification.
