The Bently Nevada 21000 proximity probe housing assembly delivers robust protection for critical rotating machinery monitoring. This housing system safely encloses the sensing element while maintaining accurate gap measurements. Manufactured under strict quality controls, this assembly suits both new installations and retrofit projects. It complies with the American Petroleum Institute's API 670 standard for externally mounted housings. Users in oil, gas, power generation, and heavy industry trust this model for its reliable performance. The full model 21000-28-05-15-028-04-02 comes fully assembled and factory-tested.
This housing assembly integrates several key components into a single unit. It includes a dome cover, threaded conduit ports, a probe sleeve, O-rings, a reverse mount proximity probe, and a thread seal. The standard model features an aluminum body with a 304 stainless steel sleeve for corrosion resistance.
Probe and Cable Details
The unit uses a 3300 XL 8 mm probe with a selectable hazardous area approval option. Cable length measures 0.5 m (20 in) , which keeps the probe visible for inspection. The maximum combined dimension (C+D) with this cable is 13.5 in (34.3 mm) .
Mounting and Fitting Options
This assembly includes a 1.5 in (38 mm) standoff adapter and a 2.8 in probe penetration . The fitting option provides one 3/4-14 NPT plug . Mounting threads are also 3/4-14 NPT , which must be ordered when the standoff adapter is not set to 00. These NPT fittings ensure leak-proof connections in demanding environments.
The 21000 housing operates reliably across a wide temperature range. CSA certification confirms explosion-proof performance for hazardous locations. Specifically, it carries a T5 rating at -50°C to +40°C and a T4 rating at -50°C to +80°C .
Hazardous Area Approvals
For North American users, the CA21000 version meets Class I Divisions 1 and 2 Groups C and D, Class II Divisions 1 and 2 Groups E, F, and G, plus Class III requirements. The circuit remains non-incendive when connected per drawing 140979. Enclosure Type 4 provides watertight and dust-tight protection. International users outside North America should order the standard 21000 housing without the CA prefix.
Material Durability
The aluminum body with a 304 stainless steel sleeve resists corrosion and mechanical wear. This combination balances lightweight construction with long-term durability. Typical weight without fittings is 1.1 kg (2.4 lb) , making handling and installation straightforward.
Proper installation ensures accurate vibration and position measurements. Follow these steps for best results. First, mount the housing securely to the machine casing using the 3/4-14 NPT threads. Next, connect the probe cable to your monitoring system, ensuring proper routing to avoid sharp bends. Then, adjust the probe penetration to 2.8 in as specified. Use the standoff adapter to position the probe correctly relative to the target surface. Finally, torque all fittings to manufacturer recommendations and verify the gap voltage before startup.
Additionally, always check the O-rings for damage during assembly. These seals prevent moisture and debris from entering the housing. Furthermore, ensure the conduit connections are tight to maintain the explosion-proof rating. Therefore, a careful installation directly extends the service life of the 21000-28-05-15-028-04-02 assembly.
The shipment includes the following items:
One 21000 proximity probe housing assembly with aluminum body and 304 stainless steel sleeve
One 3300 XL 8 mm reverse mount proximity probe with 0.5 m cable
One 1.5 in (38 mm) standoff adapter
One 3/4-14 NPT plug fitting
Mounting thread adapter for 3/4-14 NPT connections
Dome cover and threaded conduit ports
Probe sleeve and O-rings
Thread seal compound
All components ship in original factory packaging. The assembly arrives ready for installation without additional modification.
We ship all orders via FedEx, UPS, or DHL with tracking numbers provided. Domestic deliveries typically take 2 to 5 business days. International shipments usually arrive within 5 to 10 business days depending on customs clearance. Every package includes proper cushioning and anti-static protection. Please inspect the box upon arrival and report any damage immediately.
Q1: What is the difference between the 21000 and CA21000 versions?
The CA21000 version carries CSA certification specifically for North American hazardous area installations. International users outside North America must order the standard 21000 housing without the CA prefix.
Q2: Can I use this housing with a different probe cable length?
Yes, the 21000 series supports multiple cable length options. This specific model 21000-28-05-15-028-04-02 comes with a 0.5 m cable. Longer cables may affect the visible probe status.
Q3: Is this assembly compatible with non-Bently Nevada monitoring systems?
The housing and probe follow industry-standard 8 mm proximity probe specifications. However, we recommend verifying signal compatibility with your existing monitor before ordering.
Q4: What maintenance does the housing require?
Regular inspection of O-rings and conduit seals is recommended. Also check the probe gap voltage periodically. The 304 stainless steel sleeve resists corrosion, so routine cleaning with mild solvents suffices.
Q5: Do you offer expedited shipping for urgent orders?
Absolutely. Please contact our sales team to arrange next-day or second-day delivery via FedEx or UPS. Additional freight charges apply based on your location.
| Brand Name | |
| Model No. | 21000-28-05-15-028-04-02 |
| Product Type | Housing Assembly |
| hasMerchantReturnPolicy | Adjust according to reality |
| Shippingdetails | Adjust according to reality |
