Product Overview
The Bently Nevada 330172-20-55-05-02-CN is a genuine 3300 Series 5 mm proximity probe with armored construction and a 1/4-28 UNF threaded case. This Industrial Automation Module delivers non-contact vibration and position measurement in 3300 monitoring systems. The part number defines a 2.0 in unthreaded length, a 5.5 in overall case length, and a 0.5 meter armored cable terminated with a miniature coaxial ClickLoc connector.
Technical Specifications Breakdown
Key parameters for the Bently Nevada 330172-20-55-05-02-CN are listed below. All values reflect the manufacturer's original documentation.
| Parameter |
Value |
| Probe type |
3300 5mm probe, 1/4-28 UNF thread, armored |
| Unthreaded length |
20 = 2.0 in |
| Overall case length |
55 = 5.5 in |
| Total length |
05 = 0.5 m (1.6 ft) |
| Connector |
Miniature coaxial ClickLoc connector, standard cable |
| Agency approval |
CN = Country Specific |
| Weight |
0.323 kg |
| Probe tip material |
Polyphenylene sulfide (PPS) |
| Probe case material |
AISI 303 or 304 stainless steel (SST) |
| Probe case thread |
1/4-28, maximum engagement 0.375 in |
| Probe DC resistance |
7.45 ± 0.50 Ω (0.5 m length) |
| Power supply |
-17.5 Vdc to -26 Vdc, 12 mA max consumption |
| Supply sensitivity |
Less than 2 mV change per V change |
| Output resistance |
50 W |
| Probe temperature range |
-35°C to +177°C |
| Probe cable |
75 Ω triaxial, FEP insulated |
| Tensile strength |
222 N (50 lbf) probe case to lead; 222 N lead to extension connector |
| Connector torque (max) |
0.565 N·m |
| Min cable bend radius |
25.4 mm (1.0 in) |
Replacement & Upgrade Role in 3300 Systems
When an existing 5 mm probe in a 3300 monitoring system fails or drifts, the Bently Nevada 330172-20-55-05-02-CN provides a direct replacement path. The armored cable resists mechanical wear, while the stainless steel case protects against corrosive process environments. This model suits upgrades of older probes that need the same unthreaded length or overall case length.
Installation & Setup Guidance
Mounting a 1/4-28 probe requires a properly tapped hole. For this 330172-20-55-05-02-CN unit, use a #3 or larger tap drill. Maximum thread engagement is 0.375 in. Tighten the probe case to a recommended torque of 5.1 N·m, not exceeding 7.3 N·m. The connector-to-connector maximum torque is 0.565 N·m. Maintain a minimum cable bend radius of 25.4 mm to avoid internal damage.
Maintenance & Reliability
Keep the probe within its rated temperature range of -35°C to +177°C. Exposing the probe to temperatures below -34°C may cause premature failure of the pressure seal. During routine inspection, measure DC resistance from the center conductor to the outer conductor; it should remain at 7.45 ± 0.50 Ω for the 0.5 meter length. For standard calibration, the system assumes a gap of 1.27 mm (50 mils) against an AISI 4140 steel target. Inspect the cable armor and ClickLoc connector for wear.
Troubleshooting & Common Issues
If output voltage becomes unstable, verify that the supply voltage is between -17.5 Vdc and -26 Vdc. Operating above -23.5 Vdc can reduce the linear range. The supply sensitivity should stay below 2 mV change in output voltage per volt change in input voltage. A DC resistance reading outside 7.45 ± 0.50 Ω often indicates a damaged cable or connector. Check for kinks and maintain a bend radius above 25.4 mm.
Selection Guide & Purchasing Advice
Confirm the thread type, total cable length, and connector option before ordering. The 330172-20-55-05-02-CN specifies a 1/4-28 UNF thread, 0.5 meter total length, and miniature coaxial ClickLoc connector. For existing 3300 racks, verify that the extension cable and Proximitor sensor are compatible with this 5 mm probe configuration. PLC Source PRO supplies genuine Bently Nevada 330172-20-55-05-02-CN spares for control and monitoring systems.