With more than 30.000 high-quality spare parts, they can be sold immediately. Our large inventory allows us to quickly meet customer needs, thereby reducing downtime and protecting production schedules. Our timely delivery time provides you with security and save money.
The 21000-28-05-40-028-04-02 is an Aluminum Proximity Probe Housing Assembly designed for externally mounted proximity probe applications. This assembly is fully compliant with the American Petroleum Institute's (API) 670 Standard. It is certified as a CSA Type 4 enclosure and is rated explosion-proof and intrinsically safe for hazardous area installations.
Threaded ports for conduit connections
Optional conduit fittings
A dome cover that screws into the body of the housing
This specific configuration includes a 3300 XL 8 mm proximity probe with multiple hazardous area approvals, featuring a 0.5-meter (20-inch) probe cable length. The assembly is built with a 4.0-inch (102 mm) standoff adapter and provides a precise probe penetration depth of 2.8 inches. For mechanical installation, it utilizes a 3/4-14 NPT mounting thread and includes a fittings option of one 3/4-14 NPT plug.
The sleeve length of this assembly is strictly determined by the installation location, ensuring the probe lead remains longer than the sleeve. For applications requiring unsupported sleeve lengths longer than 304 mm (12 inches), additional sleeve support is mandatory to mitigate vibration. For installations routing through an inner bearing housing, a Bently Nevada probe support and oil seal (Part Number 37948-01) or custom sleeve supports can be utilized. Built for heavy-duty industrial turbomachinery, this assembly provides critical asset protection by enabling continuous, high-precision monitoring of shaft vibration and axial position.
The rugged aluminum enclosure shields the delicate 3300 XL probe from harsh environmental contaminants, mechanical impacts, and corrosive atmospheres common in oil and gas, petrochemical, and power generation facilities. Furthermore, its externally mounted construction allows technicians to adjust or replace the proximity probe safely from the outside of the machine without disrupting operations or opening the bearing housing, significantly reducing downtime and lowering overall maintenance costs.
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Oil & Gas Refining
Continuous radial vibration and axial thrust monitoring of high-speed centrifugal compressors to prevent catastrophic shaft misalignment and seal failure.
Petrochemical & Chemical Processing
Real-time monitoring of critical process pumps handling hazardous, corrosive, or high-temperature fluids to ensure zero bearing housing leaks and operational safety.
Thermal Power Generation
Shaft vibration and thermal growth (axial displacement) measurement during turbine startup, grid synchronization, and full-load operations.
Hydroelectric Power Generation
Low-frequency radial vibration and runout monitoring of vertical hydro-turbine shafts to detect hydraulic unbalance and bearing wear.
LNG Liquefaction & Regasification
Vibration monitoring of cryogenic machinery operating under extreme sub-zero temperatures, ensuring the integrity of the external probe housing housing.
Iron & Steel Metallurgy
Monitoring heavy-duty, high-vibration air supply machinery to prevent unbalance caused by dust accumulation on rotating components.
When using this probe housing assembly, disconnect the extension cable before rotation to avoid twisting the internal wires. Monitor the voltage with a multimeter to precisely calibrate the initial gap.
Securely tighten the dome cap and threaded connections to ensure strict explosion-proof and waterproof sealing.
Lastly, route the cable through metal conduits and keep it away from power lines to eliminate electromagnetic interference for stable vibration measurement.
The Bently Nevada 21000-28-05-40-028-04-02 is an API 670 compliant and IP66 (CSA Type 4) rated externally mounted proximity probe housing assembly. It comes pre-installed with a 3300 XL 8 mm probe (0.5m cable) and incorporates a 4.0-inch standoff adapter to clear thick external insulation, delivering a 2.8-inch penetration depth via a standard 3/4-14 NPT thread. Its paramount advantage is online serviceability, enabling safe external micro-gap calibration (typically to -10 VDC) or complete sensor replacement while the machinery remains fully operational without oil leakage.
What kind of device is Bently Nevada 21000-28-05-40-028-04-02?
It is an industrial-grade, externally mounted proximity probe housing assembly (aluminum body with a 304 stainless steel sleeve) pre-installed with a specific configuration of a 3300 XL 8 mm sensor probe.
What is the primary purpose of 21000-28-05-40-028-04-02?
It is installed on the exterior casing of large machinery to shield the internal precision probe from harsh environments, allowing the probe to perform non-contact measurements of micron-level shaft vibration, displacement, and speed.
How do you correctly install the 21000-28-05-40-028-04-02 assembly?
It must be installed while the machinery is completely at rest, threading the assembly into the casing via the 3/4-14 NPT threads, adjusting the internal probe depth, and locking it once the Proximitor output bias voltage matches the standard value on a multimeter.
Do you offer global delivery services?
Yes. We ship globally, and we are able to quickly deliver parts globally to any corner of the world. Unless otherwise specified, we will ship your order via (DHL). We can also ship through FedEx, UPS, and TNT. We can also use your account.
How many parts do you have in stock?
We have an extensive stock base consisting of ten thousands of new and discontinued automation parts including those from leading manufacturers such as:Control Systems (DCS, PLC, CNC) ,Panel Controllers,HMI and Display Panels,Drives,Encoders and Resolvers,Power Supplies.
Trusted by 5,000+ plants worldwide | Backed by our vast inventory of top-tier control parts, modules and cards, fast shipments are dispatched to cover your urgent needs. ABOUT US >>
Disclaimer: We are not an authorized distributor or distributor of the product manufacturer of this website, The product may have older date codes or be an older series than that available direct from the factory or authorized dealers. Because our company is not an authorized distributor of this product, the Original Manufacturer`s warranty does not apply.While many DCS PLC products will have firmware already installed, Our company makes no representation as to whether a DSC PLC product will or will not have firmware and, if it does have firmware, whether the firmware is the revision level that you need for your application. Our company also makes no representations as to your ability or right to download or otherwise obtain firmware for the product from our company, its distributors, or any other source. Our company also makes no representations as to your right to install any such firmware on the product. Our company will not obtain or supply firmware on your behalf. It is your obligation to comply with the terms of any End-User License Agreement or similar document related to obtaining or installing firmware.
Videos
News
Applications
