Bently Nevada 330709-000-040-50-02-00 3300 XL 11 mm Reverse Mount Proximity Probe
Technical Specifications
| Parameter |
Specification |
| Manufacturer |
Bently Nevada |
| Product Series |
3300 XL 11 mm Proximity Transducer System |
| Part Number |
330709-000-040-50-02-00 |
| Probe Type |
Reverse Mount Proximity Probe |
| Tip Diameter |
11 mm (0.43 in) |
| Thread Size |
3/8-24 UNF-2A (Standard) |
| Linear Range |
4.0 mm (160 mils) |
| Scale Factor |
3.94 V/mm (100 mV/mil) |
| Total Length |
5.0 meters (16.4 feet) |
| Connector Type |
Miniature Coaxial Connector with Connector Protector |
| Material Target |
AISI 4140 Steel (Standard Calibration) |
| Operating Temp |
-52 °C to +177 °C (-62 °F to +350 °F) |
| Ingress Protection |
IP68 (Probe head and seal) |
| Approvals |
CSA, ATEX, IECEx (Hazardous Area Rated) |
Frequently Asked Questions
Q1: What is this 330709-000-040-50-02-00 probe actually used for?
A1: In most cases people just treat it as a standard Bently Nevada 3300 XL 11mm Probe for displacement and vibration measurement. It’s a non-contact eddy current type sensor, so it sits close to the shaft and tracks movement without touching it. You’ll usually find it inside 3300 XL system or tied into 3500 rack system setups, especially where machines are running continuously and need stable monitoring rather than occasional readings.
Q2: How is the 330709-000-040-50-02-00 installed, anything special on mounting?
A2: This one is reverse mount design, so installation is done from outside the machine housing. That’s actually one of the reasons maintenance teams prefer it. Thread is 3/8-24 UNF-2A. In field work, it usually means you don’t have to fully open up the machine just to swap a probe, which saves time during shutdown windows.
Q3: Why do people choose the 11mm version of the 330709-000-040-50-02-00 instead of standard probes?
A3: Mainly because of the measurement range. This model gives around 4.0 mm linear range, which is roughly double what an 8mm probe can handle. In real applications like centrifugal compressor displacement or hydro-turbine shaft monitoring, shafts don’t always stay stable, especially with thermal expansion or load changes. So the extra range makes the signal less likely to saturate.
Q4: What about cable length and connectors of the 330709-000-040-50-02-00?
A4: Standard setup is 5.0 meters system length. It comes with ClickLoc connector, which is pretty common in Bently Nevada proximity probe systems. Nothing complicated here, but the connector protector does help in oily or high-moisture environments, especially in power plant instrumentation setups.
Q5: What systems does the 330709-000-040-50-02-00 work with?
A5: It’s normally used with Bently Nevada 3500/40M Proximitor Monitor or 3500/42M Proximity Monitor, depending on configuration. The probe itself works together with 3300 XL Proximitor sensor modules, forming a complete machinery protection sensor chain. In practice, this is what you’ll see in API 670 compliant systems for critical rotating machinery.
Q6: Is the 330709-000-040-50-02-00 suitable for harsh or hazardous environments?
A6: Yes, that’s actually one of its main use cases. It’s built for industrial rotating machinery environments like steam turbines, gas turbines, and oil & gas compressors. With API 670 compliance plus ATEX and IECEx certification, it’s commonly used in hazardous zones where safety requirements are strict. It’s not a “light duty” sensor, more like something you’d expect in continuous industrial operation.