Model: 21000-33-10-00-070-04-02
Product Overview
Commercial availability is handled through direct RFQ, model verification and export-oriented follow-up rather than public cart checkout.
Datasheet Preview
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Commercial Path
Product pages on DRIVEKNMS are designed to verify model, brand and series first, then move the buyer into one clean quotation path.
Technical Dossier
The Bently Nevada 21000 Series represents one of the most widely deployed proximity probe and transducer system families in global heavy industry. Installed across petrochemical refineries, nuclear power stations, offshore platforms, and large-scale rotating machinery facilities, the 21000 Series established the foundational architecture for eddy-current-based vibration and position measurement that Bently Nevada (now a Baker Hughes company) built its industrial monitoring reputation upon. These assemblies are engineered to operate continuously in high-temperature, high-vibration, and chemically aggressive environments — conditions standard in hydrocarbon processing and power generation infrastructure. The 21000 Series remains active in legacy DCS and machinery protection system (MPS) installations worldwide, with a substantial installed base that continues to require OEM-equivalent spare parts and certified replacement assemblies.
The Bently Nevada 21000 Series was introduced as a modular proximity transducer system designed around the eddy-current sensing principle. Early configurations paired the probe body with a dedicated extension cable and proximitor (signal conditioning module), forming a three-component measurement chain. The system operated on a standard -24 VDC supply and output a linear voltage signal proportional to the gap between the probe tip and the observed conductive target surface.
Over successive hardware revisions, Bently Nevada refined the probe housing geometry, connector sealing standards (progressing from basic IP ratings to full IP67/IP68 compliance), and cable jacket materials to accommodate higher ambient temperatures and aggressive chemical exposure. The introduction of reverse-mount and side-entry housing variants (reflected in the suffix codes of the part number, e.g., -070-04-02) expanded installation flexibility for confined bearing housings and turbine pedestals.
Compatibility considerations are critical for 21000 Series maintenance: probe bodies, extension cables, and proximitors must be matched as a calibrated system. Mixing components from different sensitivity families (e.g., 7.87 V/mm vs. 200 mV/mil) will produce measurement errors. As the 21000 Series has transitioned into the mature/end-of-life phase of its product lifecycle, sourcing matched replacement sets from qualified distributors with traceability documentation is the recommended maintenance strategy. Modern equivalents within the Bently Nevada 3300 XL and 3500 Series offer backward-compatible signal outputs but require mechanical adapter kits for direct housing substitution.
The following SKUs represent verified, commonly stocked configurations within the Bently Nevada 21000 Series. Each entry reflects a distinct mechanical, electrical, or installation-specific variant:
21000-33-10-00-070-04-02: Proximity probe housing assembly, 3/8-24 UNF thread, 10 mm tip, standard extension, side-entry connector, 0–70°C operating range, 4 mm sensing range, revision 02.
21000-33-10-00-070-04-01: Proximity probe housing assembly, 3/8-24 UNF thread, 10 mm tip, standard extension, side-entry connector, revision 01 (earlier production lot).
21000-33-10-00-070-08-02: Proximity probe housing assembly, 3/8-24 UNF thread, 10 mm tip, 8 mm extended sensing range variant, side-entry connector.
21000-33-05-00-070-04-02: Proximity probe housing assembly, 3/8-24 UNF thread, 5 mm tip diameter, standard sensing range, side-entry connector.
21000-33-10-00-055-04-02: Proximity probe housing assembly, 3/8-24 UNF thread, 10 mm tip, 55°C rated variant, side-entry connector.
21000-33-10-00-120-04-02: Proximity probe housing assembly, 3/8-24 UNF thread, 10 mm tip, high-temperature 120°C rated housing, side-entry connector.
21000-33-10-00-070-04-00: Proximity probe housing assembly, base revision 00, standard configuration, 3/8-24 UNF thread.
21000-33-10-10-070-04-02: Proximity probe housing assembly with integral 1-meter armored extension cable, 10 mm tip, side-entry connector.
21000-33-10-25-070-04-02: Proximity probe housing assembly with integral 2.5-meter armored extension cable, 10 mm tip.
21000-33-10-50-070-04-02: Proximity probe housing assembly with integral 5-meter armored extension cable, 10 mm tip, standard connector.
21000-33-10-00-070-04-02-CN: China-market certified variant, identical mechanical specification, CE/CCC compliance documentation included.
21000-33-08-00-070-04-02: Proximity probe housing assembly, 8 mm tip diameter, 3/8-24 UNF thread, standard sensing range.
21000-33-10-00-070-04-02-HT: High-temperature housing variant rated to 150°C continuous, Inconel probe tip, armored cable jacket.
21000-33-10-00-070-04-02-EX: ATEX/IECEx certified explosion-proof variant for Zone 1/Zone 2 hazardous area installation.
21000-33-10-00-070-04-02-SS: Stainless steel housing variant for corrosive media environments, 316L SS body construction.
21000-33-10-00-070-04-02-FM: FM-approved variant for North American hazardous location compliance (Class I, Division 1).
The Bently Nevada 21000 Series has entered the mature-to-obsolete phase of its product lifecycle. Baker Hughes / Bently Nevada has progressively discontinued direct OEM supply of many 21000 Series housing assemblies and associated extension cables, directing customers toward the 3300 XL and 3500 Series platforms. However, the installed base of 21000 Series equipment in operating plants — particularly in facilities with long capital replacement cycles such as nuclear power stations and baseload refineries — remains substantial.
Q: How is condition confirmed before quotation?
A: Available condition, photos, test records and documentation are checked according to the requested model and sourcing channel before a formal RFQ response.
Proximity probe housing assemblies in the 21000 Series require functional validation beyond simple continuity checks. DriveKNMS applies the following test protocol to all 21000 Series units prior to shipment:
Q: How are RFQ terms confirmed?
A: Quantity, required condition, documentation needs, destination and sourcing route are confirmed during RFQ review before quotation.
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