Create the eddy-current field
The 8 mm tip reacts to changes in distance from the conductive target and converts that movement into an impedance change.
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Product Description
Bently Nevada 21504-000-040-10-02 is an unarmored 7200 Series 8 mm standard-mount proximity probe for a 7200 proximity transducer system. Its tip establishes the non-contact field at the conductive target, and the integral coaxial lead carries that response to the matching extension cable and Proximitor.
The order fields of Bently Nevada 21504-000-040-10-02 define a zero unthreaded length, a 4.0 inch case and a 1.0 m lead ending in the miniature male coaxial connector. That geometry determines how far the tip projects from the 3/8-24 threaded case and where the first cable junction is located.
Because Bently Nevada 21504-000-040-10-02 has no armor, the cable route must protect the coaxial lead from abrasion, sharp bends and clamp pressure. The complete 7200 system, not the probe by itself, produces the calibrated 2.0 mm displacement range and 7.87 V/mm output used by the monitor.
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Product Specifications
| Technical Item | Specification |
|---|---|
| Brand | Bently Nevada |
| Model | 21504-000-040-10-02 |
| Product Name | 7200 Series 8 mm standard-mount proximity probe |
| Country | United States |
| Probe execution | 21504 = 8 mm, 3/8-24 UNF-2A, without armor |
| Unthreaded length | 000 = 0.0 in |
| Case length | 040 = 4.0 in |
| Integral lead | 10 = 1.0 m |
| Connector | 02 = miniature male coaxial connector |
| Cable impedance | 95 Ω coaxial |
| System calibrated range | 2.0 mm (80 mil) |
| System scale factor | 7.87 V/mm (200 mV/mil) |
| System frequency response | 0 to 10 kHz |
| System supply | −17.5 to −26 V DC at 12 mA maximum |
| Probe and extension-cable temperature | −34 to +177 °C |
03
Product Functions
Bently Nevada 21504-000-040-10-02 performs the target-facing part of the 7200 displacement measurement chain.
Carry the probe response
The 1.0 m coaxial lead preserves the probe response between the case and the miniature connector without conditioning it into the final voltage.
Complete the matched chain
A compatible extension cable and 7200 Proximitor convert the probe response into the calibrated displacement signal received by the monitor.
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Performance Characteristics
Operation of Bently Nevada 21504-000-040-10-02 depends on the complete 7200 system, the target geometry used for calibration and the temperature applied to the probe-and-cable path.
Linear measurement zone
The matched system covers an 80 mil calibrated range that begins approximately 10 mil from the probe face.
Dynamic response
The 0 to 10 kHz system response carries both static gap and vibration components when the cable and Proximitor remain matched.
High-temperature capability
The probe and extension-cable construction is specified from −34 to +177 °C, so the sensing path can remain at an elevated machine temperature while the connected electronics stay within their own stated limits.
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Common Questions
01Why does Bently Nevada 21504-000-040-10-02 need a matching Proximitor?
Bently Nevada 21504-000-040-10-02 produces a probe impedance response, not the final voltage signal. The compatible 7200 Proximitor supplies excitation and performs the conversion used by the monitor.
02What must be protected on the unarmored Bently Nevada 21504-000-040-10-02?
The integral coaxial lead of Bently Nevada 21504-000-040-10-02 must be routed away from abrasion, hot surfaces and tight clamps because the order code does not include stainless-steel armor.
03How should the 4.0 inch case of Bently Nevada 21504-000-040-10-02 be selected?
Use Bently Nevada 21504-000-040-10-02 only where the mounting boss and target reach accept the 4.0 inch threaded case with zero unthreaded length; verify tip position before tightening.
04Can Bently Nevada 21504-000-040-10-02 be mixed with a 3300 XL cable?
Do not mix Bently Nevada 21504-000-040-10-02 with a different transducer family on the basis of connector fit alone. The probe, extension cable and Proximitor must belong to the calibrated 7200 chain.
05What causes an offset change after Bently Nevada 21504-000-040-10-02 is reinstalled?
For Bently Nevada 21504-000-040-10-02, target material, probe gap, cable connection and case position all affect the static output. Re-establish the mechanical gap and verify the system voltage after reinstalling.
06How is connector contamination handled on Bently Nevada 21504-000-040-10-02?
De-energize the 7200 chain before separating Bently Nevada 21504-000-040-10-02, keep the miniature coaxial surfaces clean and dry, and reseat the connector without twisting the integral lead.
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