ENTEK 6682 Series Modules | C6682 Position Monitor

Technical Dossier

Product Details And Specifications

ENTEK 6682 Series: Comprehensive Module Range and Technical Overview

The ENTEK 6682 series is a family of machinery protection and condition monitoring modules deployed across global heavy industry installations, including petrochemical refineries, nuclear power stations, offshore platforms, and rotating equipment facilities. The series operates within the ENTEK Emonitor and IRD Mechanalysis ecosystem, providing continuous vibration, position, and process variable monitoring for critical rotating machinery such as turbines, compressors, pumps, and fans. The 6682 series occupies a well-established position in the installed base of legacy machinery protection systems, with thousands of units still in active service across facilities that require long-term spare parts availability and lifecycle extension support.

The Evolution of 6682 Series Architecture

The ENTEK 6682 architecture was developed as part of the broader ENTEK rack-based monitoring platform, designed for DIN-rail and card-cage installation in 19-inch rack enclosures. Early iterations of the 6682 family focused on analog signal conditioning for proximity probe inputs (eddy-current type), providing DC gap voltage, 1X and 2X vibration amplitude, and phase reference outputs compatible with Bently Nevada-style wiring conventions. This cross-compatibility made the 6682 series a common retrofit and replacement option in facilities originally equipped with Bently Nevada 3300 or 7200 series systems.

As the platform matured, ENTEK introduced communication-capable variants supporting 4–20 mA analog outputs and relay contact outputs for alarm and danger setpoints. The C6682 variant specifically addresses shaft radial position monitoring, measuring DC gap voltage from proximity probes to determine shaft centerline position — a critical parameter for journal bearing condition assessment. The series remained in active production through the Rockwell Automation acquisition of ENTEK in the early 2000s, after which the product line transitioned toward the Enpac and XM series platforms. The 6682 series is now classified as a mature/end-of-life product line, with no new production. All procurement is sourced from certified surplus and refurbished inventory channels.

6682 Full Catalog & Functionalities (SKU List)

The following SKUs represent verified models within the ENTEK 6682 series and its direct ecosystem. Each module is listed with its primary functional classification:

C6682: Shaft radial position monitor; DC gap voltage output from proximity probe input, dual-channel capable.
6682: Base position monitor module; single-channel proximity probe interface, analog output.
6681: Vibration monitor module; 1X amplitude and phase output, proximity probe or velocity input.
6683: Dual-channel vibration monitor; simultaneous radial vibration measurement on two planes.
6684: Thrust position monitor; axial shaft position measurement via proximity probe pair.
6685: Speed/phase reference monitor; keyphasor signal conditioning and tachometer output.
6686: Process variable monitor; 4–20 mA input conditioning for temperature, pressure, flow signals.
6687: Relay output module; configurable alarm and danger relay contacts for 6682-series monitors.
6688: Power supply module; rack-level DC power distribution for 6682-series card cage.
6689: Communication interface module; serial RS-232/RS-485 output for DCS/SCADA integration.
6690: Multiplexer module; sequential scanning of multiple proximity probe channels.
6691: Barrier/isolator module; intrinsic safety interface for hazardous area proximity probe installations.
6692: Rack backplane assembly; passive bus interconnect for 6682-series card cage.
6693: Display/indicator module; local LED bar-graph display of vibration or position amplitude.
6694: Calibration reference module; precision signal source for in-situ verification of 6682-series monitors.
6695: Differential expansion monitor; measures relative thermal growth between rotor and casing.
6696: Eccentricity monitor; slow-roll shaft bow measurement via proximity probe during startup/shutdown.
6697: Valve position monitor; linear variable differential transformer (LVDT) signal conditioning module.

Sourcing Hard-to-Find & Obsolete 6682 Series Parts

The ENTEK 6682 series reached end-of-life status following Rockwell Automation's platform consolidation. OEM replacement parts are no longer available through standard distribution channels. DriveKNMS maintains a dedicated inventory of tested surplus and refurbished 6682-series modules sourced from decommissioned plant equipment, controlled storage facilities, and certified industrial surplus networks. All units are inspected for physical integrity, cleaned, and functionally tested prior to dispatch. DriveKNMS provides documentation of test results upon request and supports customers requiring drop-in replacements without system reconfiguration. For facilities operating under extended maintenance contracts or regulatory hold requirements that prevent platform migration, DriveKNMS offers consignment stocking arrangements and priority reservation for critical spare SKUs including C6682, 6684, and 6685.

Quality Control for the 6682 Series Range

The 6682 series modules interface with proximity probe systems operating at -24 VDC bias with signal ranges typically between -2 VDC and -18 VDC. Quality verification for these modules requires specialized test procedures beyond standard power-on checks. DriveKNMS applies the following protocol to all 6682-series units: (1) Visual inspection of edge connector contacts, component solder joints, and conformal coating integrity. (2) Bench power-up with regulated -24 VDC supply and load simulation. (3) Proximity probe simulator injection at calibrated gap distances (typically 20 mil, 40 mil, 60 mil, 80 mil) to verify DC gap output linearity. (4) Alarm and danger relay contact verification at configured setpoints. (5) Analog output accuracy check (4–20 mA loop) against reference meter. (6) Burn-in cycle at elevated ambient temperature to screen latent component failures. Units that fail any stage of this protocol are quarantined and not offered for sale. Test records are retained for a minimum of 24 months.