Configured for eddy-current proximity probe mounting and alignment in Bently Nevada 3300 XL Transducer Systems, the Bently Nevada 21000-16-10-00-077-03-02 (21000 Proximity Probe Housing Assembly) provides direct physical retention and environmental sealing for shaft vibration sensing elements.
Suffix Breakdown & Model Matrix
Position
Code
Description
1-2
16
3300 XL 8 mm eddy-current proximity probe
3-4
10
Probe cable length 1.0 m (39 in)
5-6
00
No standoff adapter
7-9
077
Probe penetration 7.7 in (195.58 mm)
10-11
03
3/4-14 NPT plug, reducer to 1/2-14 NPT, cable seal grip with grommets for 1/8–3/8 in OD cables
12-13
02
Mounting thread 3/4-14 NPT
Hardware Specifications
Parameter
Specification
Model Brand
Bently Nevada
Origin
USA
Weight
1.05 kg
Dimensions
30.5 x 8.5 x 8.5 cm
Operating Temp
-40 to 85 degC
Power Consumption
Passive — none required
Material
Aluminum
Mounting Thread
3/4-14 NPT
Probe Compatibility
3300 XL 8 mm Eddy-Current Proximity Probe, 1.0 m cable
Probe Penetration
7.7 in (195.58 mm)
Cable Gland Range
1/8 to 3/8 inches OD
Gap Voltage Validation and Cross-Talk Suppression
The housing positions the 3300 XL 8 mm probe at a fixed standoff to achieve nominal gap voltage of -10 VDC for linear eddy-current transducer scaling. Mechanical rigidity minimizes cross-talk suppression issues in multi-sensor rotor dynamics applications by isolating probe bodies from adjacent vibrating structures and reducing capacitive coupling along shared cable runs.
Frequently Asked Questions
Q: Is the 3300 XL probe included with this housing assembly?
A: The assembly is configured for a 3300 XL 8 mm probe with 1.0 m cable; verify whether the probe is supplied separately per your purchase configuration — the housing itself does not include the electronic driver.
Q: Can the probe be replaced while the machine is running?
A: No. The system must be de-energized and the transducer loop disconnected before probe removal to prevent false trip signals and damage to the conditioning module.
Q: Does the absence of a standoff adapter (suffix 00) affect probe calibration?
A: Yes. Probe-to-target clearance must be verified with the actual standoff hardware installed in the final assembly; no additional adapter means the probe tip position is set solely by the housing barrel depth.
Field Installation Guidelines
Thread the housing into a rigid 3/4-14 NPT boss on the machinery case with minimum 5 full thread engagement and appropriate PTFE or pipe-thread sealant. Insert the 3300 XL probe, set tip clearance with calibrated feeler gauges, then tighten the probe set screw. Ground the probe cable shield at one point only — preferably at the system termination — to avoid ground loops. Route the cable away from high-current power conductors and maintain the minimum bend radius specified by Bently Nevada probe documentation.
