EPRO PR6426/00 CON011/916-200 Retrofit-Ready Eddy Current Proximity Sensor for Legacy Control Systems
The EPRO PR6426/00 CON011/916-200 is a high-precision eddy current proximity sensor engineered for vibration and displacement measurement in rotating machinery protection systems. As a retrofit-ready replacement unit, it is designed to integrate seamlessly into existing Bently Nevada 3300 and 3500 series monitoring racks, as well as legacy EPRO MMS 6000 and MMS 6350 machinery monitoring systems. Whether you are replacing a failed sensor on a critical turbine train, upgrading an aging compressor protection loop, or migrating from discontinued OEM hardware, this unit delivers drop-in compatibility with minimal re-engineering effort.
Industrial facilities operating gas turbines, steam turbines, centrifugal compressors, and large rotating equipment depend on continuous shaft displacement and vibration monitoring. When the original EPRO PR6426/00 CON011/916-200 reaches end-of-life or becomes unavailable through standard OEM channels, unplanned downtime and extended lead times create serious operational risk. Our retrofit-ready supply program maintains verified stock of this sensor to support emergency replacement, planned maintenance outages, and long-term spare parts strategies.
Upgrade Compatibility Table
| Parameter | EPRO PR6426/00 CON011/916-200 | Retrofit Notes |
|---|---|---|
| Sensor Type | Eddy Current Proximity Sensor | Non-contact, suitable for shaft displacement and vibration |
| Compatible Monitors | EPRO MMS 6000, MMS 6350; Bently Nevada 3300, 3500 series | Verify monitor input impedance and sensitivity setting before installation |
| Cable / Extension | CON011 extension cable, 916-200 series | Retain original extension cable where possible; replace if insulation is degraded |
| Output Signal | -24 VDC nominal (standard EPRO/BN convention) | Confirm monitor channel is configured for correct sensitivity (V/mm or V/mil) |
| Gap Setting | Typically 1.0–2.5 mm linear range | Re-gap sensor after installation; use calibrated gap tool |
| Mounting Thread | M8 or M10 (verify per installation drawing) | Do not over-torque; use thread-locking compound per OEM spec |
| Communication / Protocol | Analog signal (passive sensor, no digital protocol) | No protocol migration required; signal conditioning handled by monitor module |
| Replacement Path | Direct drop-in for PR6426/00 CON011/916-200 | No firmware update required; verify monitor sensitivity calibration |
| Commissioning Check | Gap voltage, sensitivity linearity, OK relay status | Use EPRO calibration fixture or equivalent signal simulator |
| Warranty | 12-Month Warranty | Covers manufacturing defects; full replacement or refund |
Retrofit Planning for Existing Automation Systems
A successful retrofit of the EPRO PR6426/00 CON011/916-200 begins well before the maintenance window opens. Engineering teams should first audit the existing monitoring rack to confirm which monitor module — typically an EPRO MMS 6110 or MMS 6120 vibration monitor card — is receiving the sensor signal. The monitor card’s sensitivity setting (commonly 7.87 V/mm or 200 mV/mil) must match the replacement sensor’s output characteristic. If the rack also houses an EPRO MMS 6312 speed monitor or an MMS 6823 temperature monitor, these adjacent modules should be inspected for connector integrity and power rail stability before the outage begins.
Terminal wiring for the PR6426/00 CON011/916-200 follows the standard EPRO three-wire convention: shield, signal, and power return. Before disconnecting the original sensor, photograph and document all terminal assignments on the junction box or marshalling cabinet. If the extension cable — the CON011 series — shows signs of jacket cracking, moisture ingress, or connector corrosion, replace it simultaneously with the sensor to avoid a repeat failure. Spare CON011 extension cables in 5-metre and 9-metre lengths are commonly stocked alongside the sensor for this reason.
For facilities running a Bently Nevada 3500/42M proximity monitor or a 3500/40M proximitor I/O module in parallel with the EPRO system, verify that the new sensor’s static output voltage at the installed gap falls within the monitor’s acceptance window. Some 3500-series cards require a gap voltage between -10 VDC and -18 VDC at the nominal operating gap; confirm this against the channel configuration in System 1 or the 3500 Rack Configuration Software before energising the channel.
Where the control system includes a DCS interface — for example, a Honeywell Experion PKS or an Emerson DeltaV node receiving 4–20 mA retransmission from the vibration monitor — confirm that the retransmission scaling has not drifted after sensor replacement. A brief functional test using a portable vibration calibrator or a proximity sensor simulator will confirm end-to-end signal integrity from sensor tip to DCS historian before the machine is returned to service.
If the retrofit is part of a broader control cabinet upgrade that also involves replacing an EPRO MMS 6000 rack with a newer MMS 6350 chassis, plan for backplane connector alignment and power supply capacity. The MMS 6350 rack accepts the same monitor cards but uses a revised backplane pinout for some I/O slots; verify card compatibility before transferring modules. Power supply modules — such as the EPRO MMS 6004 or MMS 6005 — should be load-tested after the new sensor is connected to confirm that the 24 VDC rail remains within tolerance under full channel load.
Downtime Control During System Migration
Minimising unplanned downtime during sensor replacement requires a structured pre-outage checklist and a clear rollback plan. Before the machine is taken offline, capture a full snapshot of the vibration monitor’s current alarm and trip setpoints, the OK relay status, and the gap voltage readings for all proximity channels on the affected rack. This baseline allows the commissioning team to verify that the replacement sensor is performing identically to the original unit before the machine is restarted.
Where the process permits, use a hot-standby or bypass strategy: configure the monitor channel to bypass mode (if supported by the EPRO MMS 6110 or equivalent card) before disconnecting the sensor. This prevents a spurious trip signal from propagating to the turbine control system or the emergency shutdown system during the swap. Confirm with the control room that the bypass is active and logged before proceeding.
After installing the EPRO PR6426/00 CON011/916-200 replacement, perform the gap-setting procedure with the shaft stationary. Adjust the sensor axial position until the output voltage matches the target gap voltage specified on the installation drawing — typically -12 VDC ± 0.5 VDC at the nominal gap. Lock the sensor in position, restore the monitor channel from bypass, and observe the OK relay for a minimum of five minutes before releasing the machine for restart. Document the as-left gap voltage, sensitivity reading, and OK relay status in the maintenance management system to support future audits and warranty claims.
For sites with strict change management requirements, the entire replacement procedure — from isolation to return-to-service — can typically be completed within a two-to-four-hour maintenance window when all spare parts, tools, and documentation are staged in advance. Our team can provide a pre-shipment test report and calibration certificate with each unit to accelerate site acceptance testing and reduce commissioning time.
Retrofit Support FAQ
Q1: Is the EPRO PR6426/00 CON011/916-200 a direct drop-in replacement for the original OEM unit?
Yes. This unit is manufactured to the same dimensional, electrical, and performance specifications as the original EPRO PR6426/00 CON011/916-200. It uses the same M8/M10 mounting thread, the same CON011 extension cable connector, and produces the same output sensitivity. No modifications to the existing wiring, terminal blocks, or monitor card configuration are required in the majority of installations. We recommend verifying the gap voltage after installation as a standard commissioning step.
Q2: What commissioning checks are required after installation?
After mechanical installation and wiring reconnection, perform the following: (1) Measure the static gap voltage with the shaft stationary and confirm it falls within the monitor’s acceptance range. (2) Verify the OK relay on the monitor card is energised. (3) Confirm the vibration reading on the monitor display is stable and within the expected baseline range for the machine at rest. (4) If the monitor supports it, perform a channel functional test using a proximity sensor simulator or calibration fixture. Document all readings before returning the machine to service.
Q3: Does the replacement unit come with a test report or calibration certificate?
Yes. Each EPRO PR6426/00 CON011/916-200 unit is supplied with a pre-shipment functional test report confirming output sensitivity, gap linearity, and OK relay operation. A calibration certificate is available on request. These documents support site acceptance testing, quality management system requirements, and warranty registration. The 12-month warranty covers manufacturing defects and covers full unit replacement or refund at our discretion.
Q4: What is the lead time and warranty coverage?
In-stock units are dispatched within 1–3 business days. Express shipping options are available for emergency replacement scenarios. All units carry a 12-month warranty from the date of shipment, covering manufacturing defects in materials and workmanship. Warranty claims are processed within 5 business days of receiving the returned unit. For sites requiring long-term spare parts agreements or consignment stock arrangements, please contact our sales team directly.
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