Bently Nevada 330707-00-20-50-02-00 Proximity Probe

Bently Nevada 330707-00-20-50-02-00 3300 XL 11 mm Armored Proximity Probe

Product Introduction

The Bently Nevada 330707-00-20-50-02-00 is a rugged member of the 3300 XL series. Specifically, this 3300 XL 11 mm Proximity Probe delivers precise non-contact displacement and vibration measurements. Therefore, it serves as an essential component in safeguarding turbines, compressors, and other high-speed rotating machinery.

First, this model features a 1/2-20 UNF thread case with stainless steel (SST) armor. Its unthreaded length is 0 inches, while the overall case length is 2.0 inches. Next, the total probe length reaches 5.0 metres, which equals 16.4 feet. Additionally, the connector option includes a miniature coaxial ClickLoc connector with standard cable. This unit does not require agency approvals (Option 00).

Importantly, this 5.0-metre probe is specifically designed for use with the five-metre Proximitor Sensor only. Using it with incompatible extension cables may affect measurement accuracy. Furthermore, the probe tip uses polyphenylene sulfide (PPS) material, and the case is constructed from AISI 304 stainless steel. Meanwhile, these materials provide excellent resistance to corrosion and wear.

Technical Specifications

Electrical and Cable Parameters

The probe cable uses a 75 Ω triaxial design with fluoroethylene propylene (FEP) insulation. This armored model comes in a 5.0-metre total length. Additionally, the DC resistance from the center conductor to the outer conductor (RPROBE) measures 7.2 ± 0.8 ohms. This value ensures consistent signal transmission over the longer cable run.

Mechanical and Environmental Ratings

The operating and storage temperature range spans from -51°C to +177°C (-60°F to +351°F). However, exposing this 3300 XL 11 mm Probe to temperatures below -34°C (30°F) may cause premature pressure seal failure. Therefore, you should avoid such low-temperature conditions. Furthermore, the probe seals differential pressure between the tip and the case using a Viton O-ring. Bently Nevada does not pressure-test these probes prior to shipment. For custom pressure testing, please contact their design department directly.

Torque and Thread Engagement

For the 1/2-20 probe case thread, the maximum length of thread engagement is 0.750 inches. The maximum rated torque for this case reaches (red)45.2 N•m (400 in•lb)(/red). However, the recommended installation torque is (red)15.2 N•m (133 in•lb)(/red). Following this recommended value prevents mechanical damage to the threads. Meanwhile, the connector-to-connector torque should be finger tight. Its maximum torque is only (blue)0.565 N•m (5 in•lb)(/blue). Finally, the minimum bend radius for the cable, with or without armor, is (blue)25.4 mm (1.0 inch)(/blue).

Installation Guidelines

Mounting and Positioning

First, clean the target surface thoroughly before installing the Bently Nevada 330707-00-20-50-02-00. Then, thread the probe carefully into the mounting hole using the 1/2-20 UNF thread. For instance, apply the recommended torque of (red)15.2 N•m(/red) to secure it properly. Over-tightening may strip the threads or deform the probe case, leading to measurement errors.

Cable Routing with Armor

Next, route the armored FEP insulated triaxial cable with care. Specifically, maintain a minimum bend radius of (blue)25.4 mm(/blue) at all times. Although the SST armor provides extra protection, sharp bends can still damage the internal conductors or degrade signal quality. Additionally, use the ClickLoc connector to attach the extension cable firmly. Tighten it finger tight only, as excessive torque can break the connector mechanism.

Compatibility Note for 5.0-Metre Probes

Furthermore, remember that this 5.0-metre probe works exclusively with the five-metre Proximitor Sensor. Do not pair it with standard extension cables designed for 1.0-metre or 9.0-metre probes. Using incorrect combinations may result in inaccurate gap voltages and unreliable readings.

Environmental Precautions

Moreover, avoid operating this 3300 XL 11 mm Armored Probe in temperatures below -34°C. This precaution preserves the pressure seal's integrity over time. Also, inspect the Viton O-ring for visible damage before installation. A damaged seal compromises the probe's pressure rating and may lead to fluid ingress.

Packaging List

• Bently Nevada 330707-00-20-50-02-00 probe unit (1 pc)

• Stainless steel armor (pre-attached over cable)

• Miniature coaxial ClickLoc connector (pre-attached)

• Standard cable assembly (5.0 metres)

• Installation instruction sheet (printed)

Note: Calibration certificates and warranty documents are not included in this package.

Shipping and Delivery

We ship all orders via Fedex, UPS, or DHL to ensure fast and reliable delivery. Consequently, you can expect your 3300 XL 11 mm Probe to arrive safely in most regions within 3–7 business days.

Frequently Asked Questions (FAQ)

Q1: What is the thread size of the Bently Nevada 330707-00-20-50-02-00?
A1: This probe features a 1/2-20 UNF thread. The maximum thread engagement length is 0.750 inches.

Q2: Why is this 5.0-metre probe special?
A2: This 5.0-metre probe is designed exclusively for use with the five-metre Proximitor Sensor. It is not interchangeable with probes of other lengths without recalibration.

Q3: Does the armor affect the cable bend radius?
A3: No, the minimum bend radius remains 25.4 mm (1.0 inch) whether the cable has SST armor or not. Bending it more sharply may damage the cable.

Q4: Can I use this probe in high-pressure environments?
A4: Yes, it seals differential pressure with a Viton O-ring. However, Bently Nevada does not pressure-test each unit before shipping. Contact them for custom testing if required.

Q5: How tight should I fasten the connector?
A5: Tighten the ClickLoc connector finger tight only. The maximum torque for the connector is 0.565 N•m (5 in•lb). Over-tightening can break the connector.