Bently Nevada 21000‑00‑00‑15‑226‑03‑02 Proximity Probe Housing Assembly
Product Overview
21000‑00‑00‑15‑226‑03‑02 belongs to the Bently Nevada 21000 series all‑metal proximity probe housing assembly.
It features an aluminum body with 304 stainless steel probe sleeve. Code position A = 00 means empty housing without preinstalled probe.
It supports field‑selected reverse‑mount eddy current probes for external installation engineering requirements.
Compliant with API 670 and CSA explosion proof, Type4 enclosure, used for shaft vibration and shaft displacement TSI monitoring in hazardous areas of petrochemical and power plants.
Gap adjustment and probe replacement can be done externally without disassembling the machine casing, widely fitted for turbine, centrifugal compressor and pump TSI systems.
Specifications & Parameters
Technical Data
Main Housing Material: Aluminum alloy body, 304 stainless steel probe sleeve
Typical Weight (without fittings): 1.1kg
Spacer Adapter C: 15 = 38mm (1.5 inch) spacer adapter length
Probe Insertion Depth D: 226 = 574mm (22.6 inch)
Fitting Option E: 03, cable gland, NPT adapter, NPT plug, fits 1/8~3/8 inch cable OD
Mount Thread Option F: 02, 3/4‑14 NPT reinforced thread, 5‑7 full threads for rigid mounting
Enclosure Certification: CSA Type4, North America Class I Div1/2 explosion proof
Compatible Probe Temp: -51℃ ~ +177℃; 3300 NSv probe: -34℃ ~ +177℃
Max C+D Total Length: Subject to probe cable length; support sleeve bracket required over 300mm
Compatible Probes: 3300XL 8mm, 3300XL 11mm, 3300XL NSv reverse mount probes
Included Parts: Dome cap, thread port, O‑rings, thread seals, spacer adapter, cable sealing assembly
Function Description
Housing & Probe Mounting Function
21000‑00‑00‑15‑226‑03‑02 acts as external protective shell for reverse‑mount proximity eddy current probes.
Thread conduit ports reserve routing space and mechanical protection for probe cables.
The spacer adapter sets the probe mounting reference distance.
Insertion depth can be adjusted externally for gap calibration without shutdown or machine disassembly.
Internal O‑rings and thread seals block oil, gas and dust ingress.
Sleeve support is mandatory for C+D longer than 300mm to eliminate resonance risk.
E‑03 gland kit includes multi‑size gaskets to seal different probe cable outer diameters.
Main Functions & Features
Core Design Advantages
All‑metal explosion proof housing, CSA hazardous area rated, compliant with API670 external probe mounting rules.
Externally adjustable structure; no casing disassembly required for probe insertion tuning, easier vibration and displacement commissioning.
Modular selection; this unit is empty housing, user selects Bently Nevada reverse mount probes separately on site.
Reinforced NPT mounting thread with 5‑7 full threads, higher rigidity and less vibration interference at measurement points.
Multi‑size sealing fittings for E‑03; integrated cable gland seals various cable outer diameters.
Removable spacer adapter to adjust reference for different bearing housing wall thickness.
Dome threaded cap enables convenient access for probe wiring inspection.
Product Characteristics
Industrial Grade Construction
Lightweight aluminum housing plus corrosion resistant 304 stainless sleeve for long service life in oil‑gas environments.
Type4 rated enclosure, resistant to liquid spray and dust intrusion.
Supports long probe insertion; 37948‑01 support oil seal eliminates sleeve resonance on long stroke installations.
O‑ring seals available in FKM, neoprene, EPDM for compatibility with different process media.
Fits full range of Bently 3300 reverse mount eddy current probes with multi‑zone approvals.
Spare parts sold separately; sleeve and spacer adapter replaceable without full housing replacement.
Product Advantages
Engineering & Maintenance Benefits
No machine shutdown or disassembly for probe service, greatly cutting maintenance downtime vs direct probe mounting.
Aluminum version is lighter than 24701 stainless variant, reducing extra load on bearing housings.
Anti‑loosening reinforced thread design lowers risk of vibration reading drift.
CSA explosion proof certification meets North American petrochemical hazardous area project standards.
Empty housing design gives flexibility to match probes per application and reduce stocking burden.
Sleeve and spacer can be individually sourced to reduce later maintenance expense.
Application Scenarios
Typical Installation Sites
TSI shaft monitoring points for large steam turbines
External probe mounting for centrifugal compressor shaft vibration and displacement
Condition monitoring for high‑speed pumps and booster pumps in petrochemical plants
Rotating machinery protection for oil & gas hazardous classified zones
External probe layout for thermal power and gas turbine bearing housings
Online vibration monitoring for centrifugal equipment in coal chemical facilities
Usage Purpose
Core Functions
Enclose and protect reverse‑mount eddy current proximity probes
Enable external gap calibration and adjustment of the proximity probe
Provide explosion proof protection for probes under hazardous operating conditions
Isolate oil, gas and dust to protect probe cable junctions
Adjust probe mounting reference distance to suit different bearing housing wall thickness
Mounting hardware matched to Bently Nevada 3500 and 3300 monitoring systems
Matching Bently Nevada Spare Parts
Compatible Accessories & Probes
Probes: 330105‑02‑12 series 3300XL 8mm reverse mount probe; 330906‑02‑12 3300XL NSv reverse probe; 330705‑02‑18 3300XL 11mm reverse probe
Support Parts: 37948‑01 probe support & oil seal (mandatory over 304mm sleeve); 21003‑AAA spacer adapter; 44382‑AAA replacement probe sleeve
Monitor Rack Modules: 3500/40 displacement module, 3500/42 vibration module; 3300 XL proximitor
Cables: 330130 series extension cables
FAQ (8 Questions Fixed)
Common Technical Questions
Q: What does position A code 00 mean? Does this housing ship with a probe?
A: Code 00 means empty housing without preinstalled probe. Probes must be ordered separately; the assembly cannot be energized directly.
Q: What is required when total C+D length exceeds 300mm?
A: Sleeve support 37948‑01 probe support oil seal is required to avoid resonance, abnormal vibration readings or probe damage.
Q: Can 21000‑00‑00‑15‑226‑03‑02 work directly with 31000 series probes?
A: Not interchangeable. 21000 fits reverse mount probes while 31000 is designed for forward mount probes with different mechanical interfaces.
Q: What is included in E option 03 and what cable outer diameters are supported?
A: E‑03 includes 3/4‑14 NPT plug, NPT reducer, multi‑port cable gland. It accepts cable OD from 1/8 inch to 3/8 inch with matched rubber gaskets.
Q: What is the difference between CA21000 and standard 21000 housing for project selection?
A: CA prefix = full CSA certified assembly for North America. Standard non‑CA housing has Type4 approval; probe must carry separate explosion proof certification for non‑North American projects.
Q: What unit is D code 226, can insertion depth be customized?
A: D = 0.1 inch increments, 226 = 22.6 inches. Custom depth available in 0.1 inch steps, ±0.5 inch adjustment range.
Q: Can I replace only the probe sleeve instead of the whole housing assembly?
A: Yes. Sleeve part number 44382‑AAA is available separately. Calculate AAA value using original model formula instead of measuring physical sleeve length.
Q: What is F option 02? Is 02 mandatory when spacer adapter C is not 00?
A: F‑02 is reinforced 3/4‑14 NPT thread with 5‑7 full threads. F=02 is mandatory for non‑zero C spacer adapter to guarantee mounting strength.
Recommended Bently Nevada Series Models
Related Probe Housings & Spares
24701‑AA‑BB‑CC‑DDD‑EE‑FF Stainless Steel Proximity Probe Housing Assembly
164818‑AA‑BB‑CCC‑DD‑EE‑FF Compact Proximity Probe Housing Assembly
CA21000‑AA‑BB‑CC‑DDD‑EE‑F02 CSA Certified Aluminum Probe Housing Assembly
CA24701‑AA‑BB‑CC‑DDD‑EE‑FF CSA Certified Stainless Steel Probe Housing Assembly
31000‑AA‑BB‑CC‑DDD‑EE‑FF Non‑Explosion‑Proof Probe Housing Assembly
32000‑AA‑BB‑CC‑DDD‑EE‑FF Improved Non‑Explosion‑Proof Probe Housing Assembly
37948‑01 Probe Support and Oil Seal Assembly
21003‑AAA Independent Spacer Adapter
44382‑AAA Replaceable Probe Sleeve
330105‑02‑12‑CC‑DD‑EE 3300XL 8mm Reverse Mount Probe
330906‑02‑12‑CC‑DD‑EE 3300XL NSv Reverse Probe
330705‑02‑18‑CC‑DD‑EE 3300XL 11mm Reverse Mount Probe
Precautions
Installation & Application Notes
This is empty housing. Matching reverse mount probe must be ordered separately, probe cable length longer than total sleeve length.
Sleeve support is required if C+D >300mm, resonance causes false readings and probe damage.
NSv probes cannot run continuously below -34℃; low temperature leads to premature seal failure.
Counterbore the machine housing for insertion depth 1~2 inch to eliminate nearby metal measurement interference.
Full assembly (housing, fittings, probe) must satisfy area explosion proof requirements for hazardous classified locations.
F=02 reinforced thread is mandatory when spacer adapter C is non‑zero, other thread codes are not allowed.
For 44382‑AAA replacement sleeve, calculate AAA parameter by original model code instead of physical measurement.
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