The Bently Nevada 21000 assembly provides an external mounting point for a reverse-mount proximity probe. Its threaded cover gives access to the probe connection while the sleeve positions the probe through the machine case toward the rotating target.
Assembly roleThe housing supports access, positioning and cable entry. The connected proximity transducer chain performs the actual displacement measurement.
MEASUREMENT CHAIN
Machine Case3/4-14 NPT port
→
21000 HousingSleeve and probe
→
Extension CableMatched system length
→
ProximitorConditioned signal
Exact Order-Code Configuration
Housing family
21000 aluminum housing with 304 stainless steel sleeve
Probe option 16
3300 XL 8 mm reverse-mount probe with connector protector and multiple approvals
Cable option 05
0.5 m (20 in) probe cable
Standoff option 00
No standoff adapter
Penetration 105
10.5 in (267 mm) nominal C plus D selection
Adjustment
Probe penetration option D adjusts by plus or minus 0.5 in (13 mm)
Fitting option 03
3/4-14 NPT plug, 3/4-14 to 1/2-14 NPT reducer and cable seal grip
Cable-seal ranges
1/8 to 3/16 in, 1/4 to 5/16 in, and 5/16 to 3/8 in
Mount option 02
3/4-14 NPT machine mounting thread
Hazardous-area status
This plain 21000 housing with fitting 03 is not a CSA explosion-proof housing configuration
Installation Hold Points
01 / ReachConfirm the 10.5 in sleeve reach against the machine drawing and final probe gap.
02 / ThreadVerify the 3/4-14 NPT machine port, engagement and sealing method.
03 / CableMatch the 0.5 m probe lead to the required extension cable and Proximitor system length.
04 / GapSet the final gap with the connected calibrated channel, then secure the sleeve and seals.
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Does this order include the proximity probe?Yes. Option 16 selects a 3300 XL 8 mm reverse-mount probe with connector protector and multiple approvals.
2
Is this assembly CSA explosion proof?No. The 03 fitting choice is not one of the fitting combinations used for the CSA-rated explosion-proof housing arrangement.
3
Does the 10.5 in reach require extra sleeve support?The stated support threshold applies when C plus D exceeds 12 in. The actual installation must still be checked for rigidity and resonance.
4
Which mechanical details must match?Confirm the 3/4-14 NPT machine port, 10.5 in reach, available cover clearance, cable-seal range and probe target position.
5
What should be checked after installation?Verify probe gap voltage, system length, cable routing, thread sealing, O-ring condition and stable vibration response through the operating range.
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Check 21000 Assembly Availability
Send the full order number, machine-port dimensions and required delivery destination.