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The 21000 and 24701 Proximity Probe Housing Assemblies areavailable with Canadian Standards Association (CSA)approvals. They are rated explosion proof for hazardousareas.

You can order hazardous area approved proximity probes with 21000 aluminum and 24701 stainless steel housings for intrinsically safe applications. Both housingsare certified as CSA Type 4 enclosures and arefully compliant with the American PetroleumInstitute's (APi) 670 Standard for externallymounted proximity probe housings.

The 164818 Compact Proximity Probe Housing is also available for applications with spacerestrictions. Ceramic capped probes are available with the 164818 housing.

Frequently Asked Questions

What is the Bently Nevada 21000-28-05-35-020-04-02?

It is an explosion-proof, aluminum proximity probe housing assembly used to mount and protect 3300 XL 8mm sensors on rotating machinery.

What sensor is pre-installed in this specific part number?

The -28 option signifies it comes with a 3300 XL 8mm proximity probe featuring a connector protector and multiple approvals.

What is the cable length of the internal probe?

The -05 option dictates a 0.5-meter (20-inch) internal probe cable length.

What is the linear range of the built-in 8mm probe?

The 3300 XL 8mm probe features a linear range of 2.0 mm (80 mils), starting from approximately 0.25 mm (10 mils) from the target.

Product Applications

Oil and gas, refineries: Used for monitoring shaft vibration and displacement in catalytic cracking blowers, hydrogenation feed pumps, and reciprocating/centrifugal compressors. The explosion-proof design of the enclosure ensures safe operation in flammable and explosive gas environments (Class 1 Div 1).

Coal and nuclear power plants: Installed on large steam turbine generator sets, feedwater pumps, and induced draft fans to monitor the rotor's axial position (thrust bearing wear) and radial vibration in real time, preventing "rotor swirl" accidents caused by severe vibration under heavy loads.

Large chemical plants: Used in ethylene compressors and various corrosion-resistant high-power pumps. With the external mounting enclosure, technicians can directly adjust the probe gap or replace probes externally without disassembling the machine or depressurizing, greatly reducing plant downtime for maintenance.

Metallurgical and steel plants: Used in high-load, dusty, and humid environments such as blast furnace blowers and large rolling mill drive systems. The enclosure (Type 4 sealing level) perfectly protects the internal sensors from moisture, oil, and iron filings.