330101-00-20-05-02-05 is a Bently Nevada 3300 XL series standard eddy current probe with a total length of 0.5 meter (1.6 feet). This model builds on the base configuration (3/8-24 UNF threads, 0.0‑inch unthreaded length, 2.0‑inch case length, standard ClickLoc connector and standard cable) by adding CSA, ATEX, and IECEx hazardous area approvals, making it suitable for intrinsically safe (IS) installations in explosive atmospheres. Its most notable features are the 2.0‑inch (approx. 50.8 mm) extra‑long case combined with the 0.5 m short total length, specifically designed for long‑distance monitoring applications in hazardous areas that require very deep threaded mounting holes and a 9‑meter intrinsically safe system.
With a total length of 0.5 m, this probe must be paired with an 8.5‑meter hazardous area approved extension cable (e.g., 330130-085-00-05) to form a complete 9‑meter IS system (0.5 m probe + 8.5 m extension cable = 9 m system). It is ideal for large rotating machinery monitoring where the Proximitor Sensor is mounted in a safe area (e.g., a control room) and the probe is installed in Zone 0, Zone 1, or Zone 2 hazardous areas, while the mounting hole depth requirements are very demanding.
Model Breakdown: 330101-00-20-05-02-05 Configuration Details
Following Bently Nevada’s part number coding system (refer to datasheet Pages 13-14), the fields in this model number represent the following:
Field | Code | Parameter | Description |
Base Model | 330101
| 3300 XL 8 mm Probe, 3/8-24 UNF thread, without armor | Compatible with 3300 XL 8 mm and 3300 5 mm systems |
Unthreaded Length (A) | 00
| 0.0 inches | Distance from probe tip to start of thread; shortest configuration |
Overall Case Length (B) | 20
| 2.0 inches | Total threaded length (code 20 = 2.0 inches) |
Total Length Option (C) | 05
| 0.5 meter (1.6 ft) | Total probe cable length (including connector); for 9 m systems |
Connector & Cable Option (D) | 02
| Miniature coaxial ClickLoc connector, standard cable | Standard FEP‑insulated cable, gold‑plated ClickLoc connector |
Agency Approval (E) | 05
| CSA, ATEX, IECEx Hazardous Area Approvals | Certified for intrinsically safe installations in explosive atmospheres |
Key Configuration Note: This model differs from 330101-00-20-05-02-00 only in the approval option (05 instead of 00). The combination of 2.0‑inch extra‑long case and 0.5 m short total length is ideal for hazardous area applications requiring very deep thread engagement and a 9‑meter IS system. The unthreaded length is 0.0 inches, meaning the thread starts immediately after the probe tip.
Hazardous Area Approvals & Conditions of Safe Use
Hazardous Area Certifications
330101-00-20-05-02-05 carries the following hazardous area approvals, suitable for installations in major industrial regions worldwide:
Certification | Type | Area Classification | Temperature Class |
ATEX / IECEx | Ex ia IIC T4/T5 Ga | Zone 0, 1, 2 | T5 @ Ta = -55°C to +40°C
T4 @ Ta = -55°C to +80°C |
cNRTLus | Class I, Zone 0, AEx/Ex ia IIC T4/T5 Ga | Class I, Groups A, B, C, D
Class II, Groups E, F, G
Class III | Same as above |
In addition, the probe also meets ATEX/IECEx dust ignition protection (Ex ia IIIC T90°C … T280°C Dc). Refer to the datasheet Page 12 temperature schedule for specific temperature classes based on ambient temperature.
Conditions of Safe Use (Intrinsically Safe Systems)
When used in an intrinsically safe system, the following conditions must be observed:
Barriers/Isolators: Must be installed with intrinsically safe zener barriers per Bently Nevada drawing 141092, or with galvanic isolators.
Entity Parameters (when connected to approved Proximitor Sensor):
Ui = -28V
Ii = 140 mA
Pi = 0.91 W
Ci = 47 nF
Li = 1460 μH
Installation Environment: The Proximitor Sensor must be installed in a non‑hazardous area or within an approved explosion‑proof enclosure.
System Integrity: The probe, extension cable, Proximitor Sensor, and any connector protectors must all carry the same hazardous area approval rating. Mixing non‑approved components will void the certification.
Important: This probe must be used with hazardous area approved extension cable (e.g., 330130-085-00-05) and Proximitor Sensor (e.g., 330180-90-05) to maintain a complete 9‑meter intrinsically safe system.
Application Scenarios & Selection Guide
330101-00-20-05-02-05 is suitable for the following typical applications:
Precise Total Length Matching for 9‑Meter IS Systems: This 0.5 m probe must be paired with an 8.5‑meter hazardous area approved extension cable (e.g., 330130-085-00-05) to form a complete 9‑meter IS system (0.5 m + 8.5 m = 9 m). Ideal for long‑distance monitoring where the Proximitor Sensor is mounted in a safe area (control room) and the probe is installed on equipment in a hazardous area.
Hazardous Area Installations Requiring Very Deep Thread Engagement: The 2.0‑inch case length (approx. 50.8 mm) is one of the longest options in the 330101 series, suitable for extremely deep mounting holes or very thick equipment walls in hazardous areas, such as turbine casings with heavy insulation, large compressor housings, or special mounting adapters.
Large Rotating Machinery Monitoring in Hazardous Areas: For shaft vibration, axial position, and Keyphasor measurements on compressors, steam turbines, generators, and pumps located in Zone 0/1/2 areas such as refineries, petrochemical plants, and natural gas facilities.
Suitable for IIC Gas Group: This probe is suitable for the most dangerous environments containing hydrogen, acetylene, carbon disulfide, and other IIC group gases.
Selection Notes:
Total Length Matching: Probe length + extension cable length = Proximitor Sensor total system length (5 m or 9 m). This 0.5 m probe must be used with an 8.5‑meter hazardous area approved extension cable to form a 9‑meter IS system. Do not pair it with a 4.0 m cable (that would create a 4.5 m system, which does not match standard Proximitor lengths).
System Accuracy: The 9‑meter IS system has a larger linear deviation (DSL) of < ±0.038 mm compared to ±0.025 mm for 5‑meter systems. For extremely high accuracy requirements, consider using a 5‑meter IS system.
Case Length Selection: This model has a 2.0‑inch case length, which is among the longest options. Before installation, carefully measure the effective thread depth of the mounting hole. Important: The datasheet maximum recommended thread engagement is 0.563 inches. The 2.0‑inch case is not meant to be fully threaded into the hole; the extra length accommodates the depth of the mounting hole. The actual engagement should be limited to ≤0.563 inches using the lock nut and washers. Exceeding the recommended engagement may cause installation difficulty or probe damage. If the mounting hole is shallow, select a hazardous area approved model with a 0.8‑, 1.2‑, 1.4‑, or 1.6‑inch case length.
Unthreaded Length: This model has 0.0‑inch unthreaded length. If your mounting hole has an internal shoulder or you need the probe tip to extend a certain distance, select a hazardous area approved model with a longer unthreaded length (e.g., code "04" = 0.4 inches).
Temperature Class Selection: Choose T4 or T5 based on the ambient temperature. T5 (-55°C to +40°C) is for lower ambient temperatures; T4 (-55°C to +80°C) covers a wider range.
Ambient Temperature: Standard probe is rated to +177°C. If the application exceeds this temperature, select an ETR high‑temperature hazardous area approved probe (330191/330192 series with approval option 05).
Armor Protection: If the cable may be subject to mechanical damage (crushing, abrasion), select an armored hazardous area approved probe (e.g., 330102-00-20-05-02-05, if available).
Connector Protection: In hazardous areas, connector protectors (order separately, suitable for hazardous area use) are strongly recommended to prevent oil mist or moisture ingress and maintain intrinsic safety sealing integrity.
Mechanical Dimensions & Installation
Probe Tip Diameter: 8.0 mm (0.31 in)
Thread Specification: 3/8-24 UNF-2A; recommended lock nut torque: 11.2 N·m (100 in·lbf)
Overall Case Length: 2.0 in (50.8 mm)
Unthreaded Length: 0.0 in
Cable Outer Diameter: 3.68 mm (0.145 in) maximum
Connector Outer Diameter: 7.24 mm (0.285 in) maximum
Minimum Bend Radius: 25.4 mm (1.0 in)
Installation Drawing: Intrinsically safe system installation must strictly follow Bently Nevada drawing 141092, including barrier selection, grounding, and wiring practices.
Installation Tips: Before installation, carefully measure the effective thread depth of the mounting hole. Because the case length is 2.0 inches but the recommended thread engagement is only 0.563 inches, do not thread the entire case into the hole. Use the lock nut and washers to limit the effective engagement to ≤0.563 inches while ensuring a secure installation. Use the recommended lock nut (part number 04301007) and tighten to the specified torque. Set the probe gap to the recommended -9 Vdc (approx. 1.27 mm), which can be monitored via the Proximitor Sensor output voltage. In hazardous areas, all operations must comply with relevant explosion protection standards (e.g., IEC 60079-14).
Related Products & Compatible Configurations
This probe is typically used with the following hazardous area approved products to form a 9‑meter IS system:
Companion Product | Recommended Model | Description |
Extension Cable | 330130-085-00-05 | 8.5 m standard hazardous area cable, forms 9 m IS system |
Proximitor Sensor | 330180-90-05 | 9 m system panel‑mount hazardous area Proximitor |
Lock Nut | 04301007 | 3/8-24 lock nut with safety wire holes (no approval required) |
Mounting Bracket | 137492-01 | Aluminum threaded mounting bracket, 3/8-24 thread (no approval required) |
Connector Protector | 40180-02 (or 40113-02) | Connector protector kit, recommended for hazardous areas |
For other configurations, refer to the following hazardous area approved probe options:
Model | Thread | Unthreaded Length | Case Length | Total Length | Armor | Approvals | Application |
330101-00-20-05-02-05 | 3/8-24 | 0.0" | 2.0" | 0.5 m | No | ATEX/IECEx | Current model, 9 m IS system short probe, extra‑long case |
330101-00-16-05-02-05 | 3/8-24 | 0.0" | 1.6" | 0.5 m | No | ATEX/IECEx | 9 m IS system short probe, medium‑long case |
330101-00-14-05-02-05 | 3/8-24 | 0.0" | 1.4" | 0.5 m | No | ATEX/IECEx | 9 m IS system short probe, extra‑long case (1.4 in) |
330101-00-12-05-02-05 | 3/8-24 | 0.0" | 1.2" | 0.5 m | No | ATEX/IECEx | 9 m IS system short probe, long case |
330101-00-08-05-02-05 | 3/8-24 | 0.0" | 0.8" | 0.5 m | No | ATEX/IECEx | 9 m IS system short probe, standard short case |
330102-00-20-05-02-05 | 3/8-24 | 0.0" | 2.0" | 0.5 m | Yes | ATEX/IECEx | 9 m IS system with armored mechanical protection, extra‑long case |
Matching Extension Cable: This probe must be used with an 8.5‑meter hazardous area approved extension cable (e.g., 330130-085-00-05) to form a complete 9‑meter IS system.
Inquiry & Technical Support
330101-00-20-05-02-05 is an extra‑long case, short total length hazardous area model in the Bently Nevada product line, designed for long‑distance monitoring applications in hazardous areas that require very deep mounting holes. For pricing, lead time, or technical drawings, please contact us:
Online Inquiry: Click the “Request a Quote” button and provide the model number for a prompt response.
Technical Support: If you need assistance verifying whether this configuration meets your hazardous area 9‑meter IS system total length matching and installation dimension (especially case length) requirements, please provide the depth of your mounting hole, the hazardous area classification, and the extension cable and Proximitor Sensor models you are using, and we will help confirm compatibility.
