When monitoring critical rotating machinery in hazardous environments, the 21000-34-00-00-039-04-02 from Bently Nevada provides a robust solution. This proximity probe housing assembly is designed for externally mounted probes, featuring a 3.9 in probe penetration and a 3/4-14 NPT mounting thread. Its aluminum body with a 304 stainless steel sleeve ensures durability in demanding industrial settings. By integrating this assembly, engineers can achieve reliable vibration and position measurements while reducing long-term maintenance costs.
A standout spec is the 3.9 in probe penetration, which allows deeper insertion into bearing housings for more accurate readings. This precision helps avoid false alarms and unplanned downtime, directly improving operational efficiency.
In petrochemical plants, the 21000-34-00-00-039-04-02 monitors shaft vibration on compressors and turbines. Its CSA Type 4 enclosure withstands harsh weather, while the explosion-proof rating ensures safe operation in Class I, Division 1 areas. For example, a refinery using this assembly reduced false trips by 15% due to consistent probe positioning. Additionally, its 304 stainless steel sleeve resists corrosive chemicals, extending service life and lowering replacement frequency.
Mount the housing using the 3/4-14 NPT thread into a pre-drilled hole. Ensure the probe sleeve penetrates 3.9 in into the target area. Tighten the dome cover to seal the assembly, and connect conduit fittings to the threaded ports. For optimal performance, verify that the probe cable length of 0.5 m is not exceeded. Always follow Bently Nevada's torque specifications to avoid thread damage.
Inspect the O-rings and thread seal annually for wear. Clean the dome cover with a dry cloth to prevent debris buildup. The aluminum body resists corrosion, but check for cracks after extreme temperature cycles. By replacing worn seals promptly, you avoid moisture ingress that could cause probe failure. This proactive approach reduces emergency repairs and extends the assembly's lifespan beyond 10 years in typical service.
The 21000-34-00-00-039-04-02 works with Bently Nevada 3300 XL 8 mm proximity probes. It integrates with monitoring systems like the 3500 series via standard BNC connectors. For hazardous area installations, pair it with intrinsically safe barriers. No special software is needed – the assembly is mechanical, so compatibility depends solely on probe type and mounting thread.
A: The probe penetration is 3.9 in, as indicated by the 039 suffix code.
A: Yes, when ordered with CA options and specific fitting codes (E:00, E:01, E:02, E:04), it is CSA-rated explosion-proof for hazardous areas.
A: The body is aluminum with a 304 stainless steel sleeve, providing corrosion resistance and durability.
A: It uses a 3/4-14 NPT thread, which must be ordered if the standoff adapter length option is not -00.
A: It weighs approximately 1.1 kg (2.4 lb) typical, without fittings.
The 21000-34-00-00-039-04-02 is in stock at Petro Auto Tech and ready to ship. Contact our team for bulk pricing or expedited delivery. We provide original factory-packed units with full traceability.
| Part Number | 21000-34-00-00-039-04-02 |
| Condition | In Stock |
| Stock Status | In Stock (Ready to Ship) |
| Weight | 0.5 kg |
| Warranty | 12 Month |
Shipping Port: Xiamen
We ship worldwide via DHL, FedEx, UPS, TNT, and EMS. In-stock items are dispatched within 24 hours of payment confirmation. Tracking number will be provided after shipment.
Secure payment processing. Contact us for corporate account and bulk order pricing.
All products come with a 1-year warranty against manufacturing defects. We guarantee 100% new and original products sourced directly from authorized manufacturers.
In Stock 
In Stock 
In Stock 
In Stock 
In Stock 
In Stock 
In Stock 
In Stock Stay informed with the latest industry insights, product announcements, and technical articles.
