AI-Tek 70082 Series Passive Speed Sensors

Technical Dossier

Product Details And Specifications

AI-Tek 70082 Series: Comprehensive Module Range and Technical Overview

The AI-Tek 70082 series represents a standardized line of passive (magnetic pickup) speed sensors engineered for continuous-duty industrial speed measurement in heavy process industries. These sensors are deployed across chemical processing plants, petroleum refineries, nuclear power generation facilities, pulp and paper mills, and steel manufacturing operations where shaft speed, gear tooth count, and rotational frequency must be monitored with high reliability under extreme environmental conditions. The 70082 series operates on the variable-reluctance principle: a ferromagnetic target (gear tooth, keyway, or bolt head) passing the sensor tip generates a sinusoidal AC voltage proportional to rotational speed. No external power supply is required, making these units inherently fail-safe and suitable for hazardous area installations. The series has accumulated decades of installed base across OEM turbine control panels, compressor monitoring systems, and conveyor drive protection circuits globally.

The Evolution of 70082 Series Architecture

AI-Tek Instruments (formerly known as Airpax / Electro Corporation) introduced the 70082 series as a successor to earlier variable-reluctance pickup families in the late 1980s. The core architecture centers on a threaded stainless steel housing (typically 3/4-16 UNF or M18x1.5 thread forms), an Alnico or ceramic permanent magnet pole piece, and a precision-wound copper coil assembly. Early variants used epoxy-potted two-wire flying leads; subsequent revisions introduced MIL-spec circular connector terminations (MS3106 series) and DIN 43650 connector options to address field-wiring standardization requirements in European process plants.

The 70082-1000-xxx sub-series designates the standard thread body with varying cable lengths and connector configurations. The 70082-2000-xxx sub-series introduced extended-range pole pieces for larger air-gap applications (up to 0.090 in / 2.3 mm). By the 2000s, AI-Tek consolidated the catalog under the Dynisco/Roper Technologies umbrella, and several 70082 variants transitioned to end-of-life status. Replacement cross-references include the AI-Tek T77xxx series and selected Bently Nevada 330xxx proximity transducer configurations for applications requiring active (powered) output signals. For legacy DCS and turbine control systems locked to passive sensor input cards, the 70082 series remains the only direct drop-in replacement.

70082 Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly stocked and sourced models within the AI-Tek 70082 passive speed sensor series. Models are organized by sub-series and termination type.

Standard Thread Body — Flying Lead Termination (70082-1000-xxx)

• 70082-1000-021: 3/4-16 UNF thread, 2-wire, 12 in. cable, standard air gap, general-purpose industrial speed sensing
• 70082-1000-022: 3/4-16 UNF thread, 2-wire, 24 in. cable, extended lead for panel-mount installations
• 70082-1000-023: 3/4-16 UNF thread, 2-wire, 36 in. cable, suitable for remote sensor-to-junction-box wiring
• 70082-1000-024: 3/4-16 UNF thread, 2-wire, 48 in. cable, used in large-frame turbine and compressor housings
• 70082-1000-025: 3/4-16 UNF thread, 2-wire, 72 in. cable, long-reach variant for deep-mounted gear housings
• 70082-1000-031: 3/4-16 UNF thread, 2-wire with shield, 12 in. cable, shielded for high-EMI environments (VFD proximity)
• 70082-1000-032: 3/4-16 UNF thread, shielded 2-wire, 24 in. cable, motor control center installations

Extended Air Gap Sub-Series (70082-2000-xxx)

• 70082-2000-021: Extended pole piece, 3/4-16 UNF, 2-wire, 12 in. cable, air gap up to 0.090 in., large gear tooth applications
• 70082-2000-022: Extended pole piece, 2-wire, 24 in. cable, suitable for worn or eccentric gear targets
• 70082-2000-031: Extended pole piece, shielded 2-wire, 12 in. cable, high-EMI extended air gap variant

Connector Termination Variants (70082-1000-xxx / MS Connector)

• 70082-1000-041: 3/4-16 UNF, MS3106A-10SL-4S circular connector, 2-pin, standard for military and aerospace-derived turbine panels
• 70082-1000-042: MS3106 2-pin connector, extended body, used in Woodward and Barber-Colman governor systems
• 70082-1000-051: DIN 43650 Form A connector, 3/4-16 UNF, 2-wire, European process plant standard termination
• 70082-1000-052: DIN 43650 Form B connector, M18x1.5 metric thread body, European OEM turbine applications

High-Temperature Variants

• 70082-1000-061: High-temp rated to 150°C continuous, PTFE-insulated cable, refinery and fired-heater applications
• 70082-1000-062: High-temp, extended cable 36 in., PTFE insulation, nuclear auxiliary system speed monitoring

Sourcing Hard-to-Find & Obsolete 70082 Series Parts

Multiple variants within the AI-Tek 70082 series have been discontinued as AI-Tek consolidated its catalog following acquisition by Roper Technologies. OEM turbine control systems from manufacturers including Woodward, Dresser-Rand, Solar Turbines, and GE Oil & Gas were factory-fitted with specific 70082 sub-variants that are no longer available through standard distribution channels. DriveKNMS maintains a dedicated inventory program for obsolete and long-lead 70082 series sensors, sourced through authorized surplus channels, OEM decommissioning projects, and verified aftermarket manufacturing partners. Each unit is individually serialized and traceable. For end-users operating legacy DCS platforms (Honeywell TDC 3000, Foxboro I/A Series, Bailey INFI 90) with passive speed input cards, DriveKNMS provides direct cross-reference support to identify the correct 70082 variant and, where necessary, recommend compatible active-output alternatives with passive signal conditioning adapters.

Quality Control for the 70082 Series Range

All AI-Tek 70082 series sensors processed by DriveKNMS undergo a structured verification protocol prior to dispatch. Coil resistance is measured against the published specification (typically 150–2,000 Ω depending on variant) using a calibrated four-wire Kelvin bridge. Insulation resistance between coil conductors and housing is tested at 500 VDC megohm measurement to confirm potting integrity. Output voltage linearity is verified on a calibrated gear-tooth test rig at defined RPM setpoints (typically 60, 600, and 3,600 RPM) to confirm the sensor's voltage-frequency characteristic. Cable jacket and connector termination integrity are inspected under 10× magnification. Units exhibiting coil resistance deviation greater than ±5% from nominal, insulation resistance below 100 MΩ, or non-linear output response are quarantined and not dispatched. Test records are retained per unit serial number for a minimum of five years.

For sourcing inquiries, cross-reference requests, or bulk availability on AI-Tek 70082 series passive speed sensors:

• Email: [email protected]
• WhatsApp: +86 18359293191
• Web: driveknms.com